Patent Grant
12154486
This application claims priority to Korean Patent Applications No. 10-2022-0103822, filed on Aug. 19, 2022 and all the benefits accruing therefrom under 35 U.S.C. § 119, the content of which in its entirety is herein incorporated by reference.
Embodiments relate generally to display devices, and more particularly to display panels, display drivers, and display devices including the display panels and the display drivers.
To display a full color image, a display device may include pixels emitting light of different colors, for example, red, green and blue pixels. In a conventional display device, the red, green and blue pixels may be arranged in a stripe (or linear) form such that pixels of the same color are arranged in each column.
To increase a resolution of a display screen, a display device having an RGBG pixel arrangement structure where a blue pixel and/or a red pixel are shared by two adjacent pixel groups (or unit pixels) has been developed. In the display device having the RGBG pixel arrangement structure, each pixel group (or each unit pixel) may have two pixels including one green pixel and one red or blue pixel. Accordingly, the unit pixel size may be reduced, and thus resolution of the display device may be increased.
However, in a conventional display device having the RGBG pixel arrangement structure, pixels having different colors (e.g., red and blue pixels) are alternately connected to a single data line, and thus power may be consumed in charging and discharging the data line such that data voltages for the pixels having different colors are alternately provided to the data line.
Some embodiments provide a display panel capable of reducing power consumption and having uniform luminance.
Some embodiments provide a display driver that drives a display panel capable of reducing power consumption and having uniform luminance.
Some embodiments provide a display device including the display panel and the display driver.
According to some embodiments, there is provided a display panel of a display device. The display panel includes: first light emitting elements located in a first row, second light emitting elements located in a second row adjacent to the first row, first pixel circuits located in the first row, and second pixel circuits located in the second row. Each of the first pixel circuits drives a first light emitting element, located in a column the same as a column in which the each of the first pixel circuits is located, among the first light emitting elements. At least one second pixel circuit of the second pixel circuits drives a second light emitting element, located in a column different from a column in which the at least one second pixel circuit is located, among the second light emitting elements.
In embodiments, the first light emitting elements may include a first red light emitting element located in a first column, a first green light emitting element located in a second column, a first blue light emitting element located in a third column, and a second green light emitting element located in a fourth column. The second light emitting elements may include a second blue light emitting element located in the first column, a third green light emitting element located in the second column, a second red light emitting element located in the third column, and a fourth green light emitting element located in the fourth column.
In embodiments, the first pixel circuits may include a first red pixel circuit located in the first column, and configured to drive the first red light emitting element, a first green pixel circuit located in the second column, and configured to drive the first green light emitting element, a first blue pixel circuit located in the third column, and configured to drive the first blue light emitting element, and a second green pixel circuit located in the fourth column, and configured to drive the second green light emitting element. The second pixel circuits may include a third green pixel circuit located in the second column, and configured to driver the third green light emitting element, a second blue pixel circuit located in the third column, and configured to drive the second blue pixel light emitting element, and a fourth green pixel circuit located in the fourth column, and configured to drive the fourth green light emitting element.
In embodiments, an anode of the second blue light emitting element located in the first column may be extended such that the anode of the second blue light emitting element is connected to the second blue pixel circuit located in the third column.
In embodiments, the second pixel circuits may further include a dummy pixel circuit located in the first column, and configured to drive no light emitting element.
In embodiments, the second pixel circuits may further include a pixel circuit located in a fifth column, and the second red light emitting element located in the third column may be driven by the pixel circuit located in the fifth column among the second pixel circuits.
In embodiments, the first light emitting elements may include a first blue light emitting element located in a first column, a first green light emitting element located in a second column, a first red light emitting element located in a third column, and a second green light emitting element located in a fourth column. The second light emitting elements may include a second red light emitting element located in the first column, a third green light emitting element located in the second column, a second blue light emitting element located in the third column, and a fourth green light emitting element located in the fourth column.
In embodiments, the display panel may further include a first data line, a second data line, and a demultiplexer circuit configured to selectively connect an output channel of a display driver to the first data line or the second data line.
In embodiments, the demultiplexer circuit may include a first switch configured to connect the output channel to the first data line in response to a first connection control signal, and a second switch configured to connect the output channel to the second data line in response to a second connection control signal.
In embodiments, the demultiplexer circuit may perform a switching operation once in each horizontal time.
In embodiments, a frame period may include a first horizontal time, and a second horizontal time subsequent to the first horizontal time, and each of the first and second horizontal times may include a first period, and a second period subsequent to the first period. The demultiplexer circuit may connect the output channel to the first data line in the first period of the first horizontal time, may connect the output channel to the second data line in the second period of the first horizontal time and the first period of the second horizontal time, and may connect the output channel to the first data line in the second period of the second horizontal time.
In embodiments, an order of connecting the output channel to the first and second data lines in a horizontal time of a first frame period may be different from an order of connecting the output channel to the first and second data lines in a corresponding horizontal time of a second frame period.
In embodiments, each of a first frame period, and a second frame period subsequent to the first frame period may include a first horizontal time, and a second horizontal time subsequent to the first horizontal time, and each of the first and second horizontal times may include a first period, and a second period subsequent to the first period. A data voltage for a first color pixel may be applied to the first data line in the first period of the first horizontal time of the first frame period, a data voltage for a second color pixel may be applied to the second data line in the second period of the first horizontal time of the first frame period, a data voltage for another second color pixel may be applied to the second data line in the first period of the second horizontal time of the first frame period, a data voltage for another first color pixel may be applied to the first data line in the second period of the second horizontal time of the first frame period, the data voltage for the second color pixel may be applied to the second data line in the first period of the first horizontal time of the second frame period, the data voltage for the first color pixel may be applied to the first data line in the second period of the first horizontal time of the second frame period, the data voltage for the another first color pixel may be applied to the first data line in the first period of the second horizontal time of the second frame period, and the data voltage for the another second color pixel may be applied to the second data line in the second period of the second horizontal time of the second frame period.
In embodiments, each of two or more consecutive first frame period, and two or more consecutive second frame periods subsequent to the first frame periods may include a first horizontal time, and a second horizontal time subsequent to the first horizontal time, and each of the first and second horizontal times may include a first period, and a second period subsequent to the first period. A data voltage for a first color pixel may be applied to the first data line in the first period of the first horizontal time of each of the first frame periods, a data voltage for a second color pixel may be applied to the second data line in the second period of the first horizontal time of each of the first frame periods, a data voltage for another second color pixel may be applied to the second data line in the first period of the second horizontal time of each of the first frame periods, a data voltage for another first color pixel may be applied to the first data line in the second period of the second horizontal time of each of the first frame periods, the data voltage for the second color pixel may be applied to the second data line in the first period of the first horizontal time of each of the second frame periods, the data voltage for the first color pixel may be applied to the first data line in the second period of the first horizontal time of each of the second frame periods, the data voltage for the another first color pixel may be applied to the first data line in the first period of the second horizontal time of each of the second frame periods, and the data voltage for the another second color pixel may be applied to the second data line in the second period of the second horizontal time of each of the second frame periods.
In embodiments, the first data line may be located in a first column, and the second data line may be located in a second column directly adjacent to the first column.
In embodiments, the first data line may be located in a first column, and the second data line may be located in a third column spaced apart from the first column.
In embodiments, the demultiplexer circuit may perform a switching operation twice in each horizontal time when the display panel is driven at a first driving frequency less than or equal to a reference frequency, and may perform the switching operation once in each horizontal time when the display panel is driven at a second driving frequency greater than the reference frequency.
According to some embodiments, there is provided a display driver that drives a display panel including a first data line and a second data line. The display driver includes an output channel selectively connected to the first data line or the second data line. Each of a first frame period, and a second frame period subsequent to the first frame period includes a first horizontal time, and a second horizontal time subsequent to the first horizontal time, and each of the first and second horizontal times includes a first period, and a second period subsequent to the first period. The output channel outputs a data voltage for a first color pixel to the first data line in the first period of the first horizontal time of the first frame period, outputs a data voltage for a second color pixel to the second data line in the second period of the first horizontal time of the first frame period, outputs a data voltage for another second color pixel to the second data line in the first period of the first horizontal time of the second frame period, and outputs a data voltage for another first color pixel to the first data line in the second period of the first horizontal time of the second frame period.
In embodiments, the output channel may output the data voltage for the second color pixel to the second data line in the first period of the second horizontal time of the first frame period, may output the data voltage for the first color pixel to the first data line in the second period of the second horizontal time of the first frame period, may output the data voltage for the another first color pixel to the first data line in the first period of the second horizontal time of the second frame period, and may output the data voltage for the another second color pixel to the second data line in the second period of the second horizontal time of the second frame period.
According to some embodiments, there is provided a display device including a display panel including a plurality of data lines including a first data line and a second data line, a display driver configured to drive the display panel, and including a plurality of output channels including a first output channel, and a demultiplexer circuit configured to selectively connect the first output channel to the first data line or the second data line. The display panel further includes first light emitting elements located in a first row, second light emitting elements located in a second row adjacent to the first row, first pixel circuits located in the first row, and connected to the plurality of data lines, respectively, and second pixel circuits located in the second row, and connected to the plurality of data lines, respectively. Each of the first pixel circuits drives a first light emitting element located in a column the same as a column in which the each of the first pixel circuits is located among the first light emitting elements, and at least one second pixel circuit of the second pixel circuits drives a second light emitting element, located in a column different from a column in which the at least one second pixel circuit is located, among the second light emitting elements. Each of a first frame period, and a second frame period subsequent to the first frame period includes a first horizontal time, and a second horizontal time subsequent to the first horizontal time, and each of the first and second horizontal times includes a first period, and a second period subsequent to the first period. In the first period of the first horizontal time of the first frame period, the demultiplexer circuit connects the first output channel to the first data line, and the first output channel outputs a data voltage for a first color pixel to the first data line. In the second period of the first horizontal time of the first frame period, the demultiplexer circuit connects the first output channel to the second data line, and the first output channel outputs a data voltage for a second color pixel to the second data line. In the first period of the first horizontal time of the second frame period, the demultiplexer circuit connects the first output channel to the second data line, and the first output channel outputs the data voltage for the second color pixel to the second data line. In the second period of the first horizontal time of the second frame period, the demultiplexer circuit connects the first output channel to the first data line, and the first output channel outputs the data voltage for the first color pixel to the first data line.
As described above, in a display panel and a display device according to embodiments, each of first pixel circuits located in a first row may drive a light emitting element located in the same column among first light emitting elements located in the first row, and at least one pixel circuit of second pixel circuits located in a second row may drive a light emitting element located in a column different from a column in which the at least one pixel circuit is located among second light emitting elements located in the second row. Accordingly, pixel having the same color may be connected to each data line, and thus power consumption for charging and discharging the data line may be effectively reduced.
Further, in a display driver and a display device according to embodiments, an output order of data voltages in at least one horizontal time of a first frame period may be different from an output order of data voltages in a corresponding horizontal time of a second frame period. Accordingly, a display panel driven by the display driver may display an image with uniform luminance.
Illustrative, non-limiting embodiments will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.
It will be understood that, although the terms “first,” “second,” “third” etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, “a first element,” “component,” “region,” “layer” or “section” discussed below could be termed a second element, component, region, layer or section without departing from the teachings herein.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, “a”, “an,” “the,” and “at least one” do not denote a limitation of quantity, and are intended to include both the singular and plural, unless the context clearly indicates otherwise. For example, “an element” has the same meaning as “at least one element,” unless the context clearly indicates otherwise. “At least one” is not to be construed as limiting “a” or “an.” “Or” means “and/or.” As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.
The embodiments are described more fully hereinafter with reference to the accompanying drawings. Like or similar reference numerals refer to like or similar elements throughout.
Referring to
In some embodiments, red, green, blue and green light emitting elements R1, G1, B1 and G2 may be repeatedly disposed in odd-numbered rows PR1 and PR3, and blue, green, and red and green light emitting elements B2, G3, R2 and G4 may be repeatedly disposed in even-numbered rows PR2 and PR4. In some embodiments, each light emitting element may be an organic light emitting diode (“OLED”), but is not limited thereto. In other embodiments, each light emitting element may be a nano light emitting diode (“NED”), a quantum dot (“QD”) light emitting diode, a micro light emitting diode, an inorganic light emitting diode, or any other suitable light emitting element.
For example, as illustrated in
In the display panel 100 according to embodiments, pixel circuits for driving the light emitting elements having the same color may be disposed in each column C1, C2, C3, C4, C5, and OC, and each data line DL1, DL2, DL3, DL4 and DL may be connected to the pixel circuits for driving the light emitting elements having the same color.
For example, as illustrated in
The red pixel circuit RPC1 and RPC2, the green pixel circuit GPC1, GPC2, GPC3 and GPC4 and the blue pixel circuit BPC1 and BPC2 may drive light emitting elements having different colors, but may have substantially the same structure. For example, as illustrated in
In the display panel 100 according to embodiments, the light emitting elements R1, G1, B1, G2, B2, G3, R2, G4, R, G and B may be arranged in an RGBG pixel arrangement structure, but pixel circuits (e.g., BPC1 and BPC2) connected to each data line (e.g., DL3) may drive the light emitting elements (e.g., B1 and B2) having the same color. To achieve this configuration, each pixel circuit (e.g., BPC1) located in in an odd-numbered row (e.g., PR1) may drive a light emitting element (e.g., B1) located in a column (e.g., C3) the same as a column (e.g., C3) in which the pixel circuit (e.g., BPC1) is located, and at least one pixel circuit (e.g., BPC2) of the pixel circuits located in an even-numbered row (e.g., PR2) may drive a light emitting element (e.g., B2) located in a column (e.g., C1) different from a column (e.g., C3) in which the pixel circuit (e.g., BPC2) is located.
For example, as illustrated in
Further, the second blue pixel circuit BPC2 located in the second row PR2 and the third column C3 may drive the second blue light emitting element B2 disposed in the second row PR2 and the first column C1. In order that the second blue pixel circuit BPC2 located in the third column C3 drives the second blue light emitting element B2 disposed in the first column C1, as illustrated in
Further, the second red pixel circuit RPC2 disposed in the second row PR2 and the first column C1 may be a dummy pixel circuit DPC that does not drive the light emitting element. The first red pixel circuit RPC1 and the first red light emitting element R1 may form a first red pixel, the first red pixel may be connected to the first data line DL1 located in the first column C1, and thus data voltages only for red pixels may be provided to the first data line DL1. The second red light emitting element R2 located in the second row PR2 and the third column C3 may be connected to a red pixel circuit RPC disposed in the second row PR2 and a fifth column C5. In some embodiments, pixel circuits located in the odd-numbered rows PR1 and PR3 and located in an outer column OC may also be dummy pixel circuits DPC.
Accordingly, in the display panel 100 according to the embodiments, the light emitting elements R1, G1, B1, G2, B2, G3, R2, G4, R, G and B may be arranged in an RGBG pixel arrangement structure, pixels having the same color may be connected to each data line, and thus data voltages only for the pixels having the same color may be provided to each data line. In a conventional display device having the RGBG pixel arrangement structure, pixels having different colors may be connected to a single data line, and thus power may be consumed in charging and discharging the data line such that data voltages for the pixels having different colors are alternately provided to the data line. However, in a display panel including the display panel 100, data voltages only for the pixels having the same color may be provided to each data line, and thus power consumption for charging and discharging the data line may be effectively reduced.
A display driver for driving the display panel 100 may have output channels OC1 and OC2 smaller in number than the number of the data lines DL1, DL2, DL3, DL4 and DL of the display panel 100 (e.g., half of the number of the data lines), and the display panel 100 may include a demultiplexer circuit 120 for connecting the output channels OC1 and OC2 of the display driver to data lines selected among the plurality of data lines DL1, DL2, DL3, DL4 and DL. Although
In some embodiments, as illustrated in
In some embodiments, the demultiplexer circuit 120 may perform a switching operation that switches data lines connected to each output channel once in each horizontal time. Since the number of switching operations of the demultiplexer circuit 120 is reduced by half compared to the number of switching operations of a conventional demultiplexer circuit that performs the switching operation twice in each horizontal time, this operation of the demultiplexer circuit 120 may be referred to as a half-frequency demultiplexing driving (“HFDD”) operation.
For example, as illustrated in
In the first period P1 of a first horizontal time HT1, the demultiplexer circuit 120 may connect the first output channel OC1 to the first data line DL1 in response to the first connection control signal CLA, the first output channel OC1 may output a first red data voltage RDV1 for the first red pixel formed by the first red pixel circuit RPC1 and the first red light emitting element R1, and thus the first red data voltage RDV1 for the first red pixel may be provided to the first data line DL1. The demultiplexer circuit 120 may perform a switching operation that switches a data line connected to the first output channel OC1 from the first data line DL1 to the second data line DL2 between the first period P1 and the second period P2 of the first horizontal time HT1. In the second period P2 of the first horizontal time HT1, the demultiplexer circuit 120 may connect the first output channel OC1 to the second data line DL2 in response to the second connection control signal CLB, the first output channel OC1 may output a first green data voltage GDV1 for the first green pixel formed by the first green pixel circuit GPC1 and the first green light emitting element G1, and thus the first green data voltage GDV1 for the first green pixel may be provided to the second data line DL2. Further, in the second period P2 of the first horizontal time HT1, a first scan signal SS1 may be applied to the first red pixel circuit RPC1 and the first green pixel circuit GPC1, the first red pixel circuit RPC1 may store the first red data voltage RDV1 of the first data line DL1 in response to the first scan signal SS1, and the first green pixel circuit GPC1 may store the first green data voltage GDV1 of the second data line DL2 in response to the first scan signal SS1. That is, the first red data voltage RDV1 applied to the first data line DL1 in the first period P1 of the first horizontal time HT1 and the first green data voltage GDV1 applied to the second data line DL2 in the second period P2 of the first horizontal time HT1 may be substantially simultaneously applied to the first red pixel and the first green pixel based on the first scan signal SS1 in the second period P2 of the first horizontal time HT1.
The demultiplexer circuit 120 may not perform the switching operation between the second period P2 of the first horizontal time HT1 and the first period P1 of a second horizontal time HT2. In the first period P1 of the second horizontal time HT2, the demultiplexer circuit 120 may connect the first output channel OC1 to the second data line DL2 in response to the second connection control signal CLB as in the second period P2 of the first horizontal time HT1, the first output channel OC1 may output a second green data voltage GDV2 for the third green pixel formed by the third green pixel circuit GPC3 and the third green light emitting element G3, and thus the second green data voltage GDV2 for the third green pixel may be provided to the second data line DL2. The demultiplexer circuit 120 may perform a switching operation that switches the data line connected to the first output channel OC1 from the second data line DL2 to the first data line DL1 between the first period P1 and the second period P2 of the second horizontal time HT2. In the second period P2 of the second horizontal time HT2, the demultiplexer circuit 120 may connect the first output channel OC1 to the first data line DL1 in response to the first connection control signal CLA, the first output channel OC1 may output a second red data voltage RDV2 (or a red dummy data voltage) for a second red pixel (or a red dummy pixel) formed by the second red pixel circuit RPC2, and thus the second red data voltage RDV2 for the second red pixel may be provided to the first data line DL1. Further, in the second period P2 of the second horizontal time HT2, a second scan signal SS2 may be applied to the second red pixel circuit RPC2 and the third green pixel circuit GPC3, the second red pixel circuit RPC2 may store the second red data voltage RDV2 of the first data line DL1 in response to the second scan signal SS2, and the third green pixel circuit GPC3 may store the second green data voltage GDV2 of the second data line DL2 in response to the second scan signal SS2. That is, the second green data voltage GDV2 applied to the second data line DL2 in the first period P1 of the second horizontal time HT2 and the second red data voltage RDV2 applied to the first data line DL1 in the second period P2 of the second horizontal time HT2 may be substantially simultaneously applied to the third green pixel and the second red pixel based on the second scan signal SS2 in the second period P2 of the second horizontal time HT2.
A third red data voltage RDV3 for the red pixel formed by the red pixel circuit RPC and the red light emitting element R in the third row PR3 and the first column C1 and a third green data voltage GDV3 for the green pixel formed by the green pixel circuit GPC and the green light emitting element in the third row PR3 and the second column C2 may be sequentially provided to the first data line DL1 and the second data line DL2 in the first period P1 and the second period P2 of a third horizontal time HT3, respectively, and a fourth green data voltage GDV4 for the green pixel formed by the green pixel circuit GPC and the green light emitting element in the fourth row PR4 and the second column C2 and a fourth red data voltage RDV4 (or a red dummy data voltage) for a red pixel (or a red dummy pixel) formed by the red pixel circuit RPC in the fourth row PR4 and the first column C1 may be sequentially provided to the second data line DL2 and the first data line DL1 in the first period P1 and the second period P2 of a fourth horizontal time HT4, respectively.
Similarly, by the second output channel OC2 and the demultiplexer circuit 120, a blue data voltage for the first blue pixel circuit BPC1 and a green data voltage for the second green pixel circuit GPC2 may be sequentially provided to the third data line DL3 and the fourth data line DL4 in the first horizontal time HT1, respectively, a green data voltage for the fourth green pixel circuit GPC4 and a blue data voltage for the second blue pixel circuit BPC2 may be sequentially provided to the fourth data line DL4 and the third data line DL3 in the second horizontal time HT2, respectively, a blue data voltage for the blue pixel circuit BPC in the third row PR3 and the third column C3 and a green data voltage for the green pixel circuit GPC in the third row PR3 and the fourth column C4 may be sequentially provided to the third data line DL3 and the fourth data line DL4 in the third horizontal time HT3, respectively, and a green data voltage for the green pixel circuit GPC in the fourth row PR4 and the fourth column C4 and a blue data voltage for the blue pixel circuit BPC in the fourth row PR4 and the third column C3 may be sequentially provided to the fourth data line DL4 and the third data line DL3 in the fourth horizontal time HT4, respectively.
Accordingly, although the switching operation may be performed only once in each horizontal time HT1, HT2, HT3 and HT4, each output channel (e.g., OC1) may sequentially provide data voltages to two data lines (e.g., DL1 and DL2) in each horizontal time HT1, HT2, HT3 and HT4. The demultiplexer circuit 120 performing the HFDD operation can reduce the power consumption for the switching operation compared to a conventional demultiplexer circuit.
However, in a case where the demultiplexer circuit 120 performs the HFDD operation, luminance of pixels in odd-numbered rows PR1 and PR3 and luminance of pixels in even-numbered rows PR2 and PR4 may be different from each other. For example, as illustrated in
In a display device including the display panel 100 according to embodiments, in order that the pixels in the odd-numbered rows PR1 and PR3 and the pixels in the even-numbered rows PR2 and PR4 may have uniform luminance, an order of connecting each output channel to data lines (or an output order of data voltages by each output channel) in each horizontal time of a first frame period may be different from the order of connecting each output channel to the data lines (or the output order of data voltages by each output channel) in a corresponding horizontal time of a second frame period different from the first frame period. In some embodiments, the order of connecting each output channel to the data lines (or the output order of data voltages by each output channel) may be changed per frame period.
However, in the first horizontal time HT1 of the even-numbered frame period or the second frame period FP2, the demultiplexer circuit 120 may sequentially connect the first output channel OC1 to the first and second data lines DL1 and DL2 in the order of the second data line DL2 and the first data line DL1 in response to the first and second connection control signals CLA and CLB that are sequentially activated in the order of the second connection control signal CLB and the first connection control signal CLA, and the first output channel OC1 may sequentially output the first green data voltage GDV1 and the first red data voltage RDV1. In the second horizontal time HT2 of the second frame period FP2, the demultiplexer circuit 120 may sequentially connect the first output channel OC1 to the first and second data lines DL1 and DL2 in the order of the first data line DL1 and the second data line DL2 in response to the first and second connection control signals CLA and CLB that are sequentially activated in the order of the first connection control signal CLA and the second connection control signal CLB, and the first output channel OC1 may sequentially output the second red data voltage RDV2 and the second green data voltage GDV2. In this case, at the end time point of the first period P1 of the first horizontal time HT1, or at the rising edge of the second connection control signal CLB, the first green data voltage GDV1 of the second data line DL2 may be changed (e.g., increased) by the coupling between the line of the second connection control signal CLB and the second data line DL2, and the first green pixel may emit light with luminance different from (e.g., lower than) the desired luminance based on the changed (e.g., increased) first green data voltage GDV1. That, in the even-numbered frame period or the second frame period FP2, the first green pixel located in the first row PR1 may emit light with relatively low luminance compared to the third green pixel located in the second row PR2. In other words, in the even-numbered frame period or the second frame period FP2, the third green pixel located in the second row PR2 may emit light with relatively high luminance compared to the first green pixel located in the first row PR1.
In this way, although a data voltage is applied to a data line in the first period P1, the data voltage is distorted by the coupling between the data line and the lines of the first and second connection control signals CLA and CLB at the end time point of the first period P1 or a start time point of the second period P2, and the distorted data voltage is applied to the pixel in the second period P2, rows of the pixels may be changed or switched between the odd-numbered frame period and the even-numbered frame period. Accordingly, the display panel 100 according to embodiments may display an image with uniform luminance. For example, although the third green pixel located in the second row PR2 may emit light with relatively low luminance compared to the first green pixel located in the first row PR1 in the odd-numbered frame period, the third green pixel located in the second row PR2 may emit light with relatively high luminance compared to the first green pixel located in the first row PR1 in the even-numbered frame period. Thus, the first green pixel located in the first row PR1 and the third green pixel located in the second row PR2 may have substantially the same luminance over a plurality of frame periods.
As described above, in the display panel 100 according to embodiments, at least one pixel circuit (e.g., BPC2) may drive a light emitting element (e.g., B2) located in a column different from a column in which the pixel circuit is disposed. Accordingly, in the display panel 100 according to embodiments, data voltages for pixels having the same color may be provided to each data line, and power consumption for charging and discharging the data line may be effectively reduced. Further, the demultiplexer circuit 120 of the display panel 100 according to embodiments may perform the HFDD operation, thereby further reducing the power consumption for the switching operation. In addition, in the display panel 100 according to embodiments, the order of connecting each output channel to the data lines or the output order of the data voltages by each output channel may be changed or switched between the odd-numbered frame period and the even-numbered frame period. Accordingly, the display panel 100 according to embodiments may display an image with uniform luminance.
Referring to
However, unlike in the first frame period FP1, in the even-numbered frame period or the second frame period FP2, the demultiplexer circuit 320 may sequentially connect the first output channel OC1 to the first and second data lines DL1 and DL2 in the order of the second data line DL2 and the first data line DL1 in the first horizontal time HT1, may sequentially connect the first output channel OC1 to the first and second data lines DL1 and DL2 in the order of the first data line DL1 and the second data line DL2 in the second horizontal time HT2, may sequentially connect the first output channel OC1 to the first and second data lines DL1 and DL2 in the order of the second data line DL2 and the first data line DL1 in the third horizontal time HT3, and may sequentially connect the first output channel OC1 to the first and second data lines DL1 and DL2 in the order of the first data line DL1 and the second data line DL2 in the fourth horizontal time HT4. Further, in the second frame period FP2, the first output channel OC1 may sequentially output the first green data voltage GDV1 and the first blue data voltage BDV1 in the first horizontal time HT1, may sequentially output the second blue data voltage BDV2 and the second green data voltage GDV2 in the second horizontal time HT2, may sequentially output the third green data voltage GDV3 and the blue data voltage BDV3 in the third horizontal time HT3, and may sequentially output the fourth blue data voltage BDV4 and the fourth green data voltage GDV4 in the fourth horizontal time HT4. Accordingly, since the rows affected by the coupling are switched between the odd-numbered frame period and the even-numbered frame period, the display panel 300 according to embodiments may display an image with uniform luminance.
Referring to
However, in each of the N consecutive second frame periods FP2-1, FP2-N subsequent to the N consecutive first frame periods FP1-1, FP1-N, the demultiplexer circuit 120 may sequentially connect the first output channel OC1 to the first and second data lines DL1 and DL2 in the order of the second data line DL2 and the first data line DL1 in the first horizontal time HT1, and may sequentially connect the first output channel OC1 to the first and second data lines DL1 and DL2 in the order of the first data line DL1 and the second data line DL2 in the second horizontal time HT2. Further, in each of the N consecutive second frame periods FP2-1, FP2-N, the first output channel OC1 may sequentially output the first green data voltage GDV1 and the first red data voltage RDV1 in the first horizontal time HT1, and may sequentially output the second red data voltage RDV2 and the second green data voltage GDV2 in the second horizontal time HT2. Accordingly, since the rows affected by the coupling are switched between the N consecutive first frame periods FP1-1, FP1-N and the N consecutive second frame periods FP2-1, . . . , FP2-N, the display panel 100 according to embodiments may display an image with uniform luminance.
Referring to
In some embodiments, as illustrated in
However, unlike in the first frame period FP1, in the even-numbered frame period or the second frame period FP2, the demultiplexer circuit 620 may sequentially connect the first output channel OC1 to first and third data lines DL1 and DL3 in the order of the third data line DL3 and the first data line DL1 in the first horizontal time HT1, may sequentially connect the first output channel OC1 to the first and third data lines DL1 and DL3 in the order of the first data line DL1 and the third data line DL3 in the second horizontal time HT2, may sequentially connect the first output channel OC1 to the first and third data lines DL1 and DL3 in the order of the third data line DL3 and the first data line DL1 in the third horizontal time HT3, and may sequentially connect the first output channel OC1 to the first and third data lines DL1 and DL3 in the order of the first data line DL1 and the third data line DL3 in the fourth horizontal time HT4. Further, in the second frame period FP2, the first output channel OC1 may sequentially output the first blue data voltage BDV1 and the first red data voltage RDV1 in the first horizontal time HT1, may sequentially output the red blue data voltage RDV2 and the second blue data voltage BDV2 in the second horizontal time HT2, may sequentially output the third blue data voltage BDV3 and the third red data voltage RDV3 in the third horizontal time HT3, and may sequentially output the fourth red data voltage RDV4 and the fourth blue data voltage BDV4 in the fourth horizontal time HT4. Accordingly, since the rows affected by the coupling are switched between the odd-numbered frame period and the even-numbered frame period, the display panel 600 according to embodiments may display an image with uniform luminance.
Referring to
Referring to
For example, in the odd-numbered frame period or the first frame period FP1, the demultiplexer circuit 120 may perform the switching operation that switches a data line connected to the first output channel OC1 from the first data line DL1 to the second data line DL2 at a time point between the first period P1 and the second period P2 of each of first and third horizontal times HT2 and HT4, and may perform the switching operation that switches the data line connected to the first output channel OC1 from the second data line DL2 to the first data line DL1 at a time point between the first period P1 and the second period P2 of each of second and fourth horizontal times HT2 and HT4. In contrast, in the even-numbered frame period or the second frame period FP2, the demultiplexer circuit 120 may perform the switching operation that switches the data line connected to the first output channel OC1 from the second data line DL2 to the first data line DL1 at the time point between at the first period P1 and the second period P2 of each of the first and third horizontal times HT2 and HT4, and may perform the switching operation that switches the data line connected to the first output channel OC1 from the first data line DL1 to the second data line DL2 at the time point between the first period P1 and the second period P2 of each of the second and fourth horizontal times HT2 and HT4.
Accordingly, in the high speed driving mode, the power consumption for the switching operation of the demultiplexer circuit 120 may be reduced. Further, in the high speed driving mode, the rows affected by the coupling may be switched between the odd-numbered frame period and the even-numbered frame period, and thus the display panel 100 according to embodiments may display an image with uniform luminance.
Referring to
The display panel 910 may include a plurality of data lines DL1, DL2, DL3 and DL4, first light emitting elements R1, G1, B1 and G2 located in a first row, second light emitting elements B2, G3, R1 and G4 located in a second row adjacent to the first row, first pixel circuits RPC1, GPC1, BPC1 and GPC2 located in the first row and respectively connected to the plurality of data lines DL1, DL2, DL3 and DL4, and second pixel circuits RPC2, GPC3, BPC2 and GPC4 located in the second row and respectively connected to the plurality of data lines DL1, DL2, DL3 and DL4. Each of the first pixel circuits RPC1, GPC1, BPC1 and GPC2 may drive a light emitting element located in a column the same as a column in which the each of the first pixel circuits RPC1, GPC1, BPC1 and GPC2 is located among the first light emitting elements R1, G1, B1 and G2. At least one pixel circuit (e.g., BPC2) of the second pixel circuits RPC2, GPC3, BPC2 and GPC4 may drive a light emitting element located in a column (e.g., a first column) different from a column (e.g., a third column) in which the at least one pixel circuit (e.g., BPC2) is located among the second light emitting elements B2, G3, R1 and G4. Accordingly, in the display device 900 according to embodiments, although the light emitting elements R1, G1, B1, G2, B2, G3, R2 and G4 may be arranged in an RGBG pixel arrangement structure, pixel circuits (e.g., BPC1 and BPC2) for light emitting elements (e.g., B1 and B2) having the same color may be connected to each data line (e.g., DL3), and data voltages only for pixels having the same color may be provided to ach data line. Although
The display driver 920 for driving the display panel 910 or the data driver 950 may have output channels OC1 and OC2 smaller in number than the number of the data lines DL1, DL2, DL3 and DL4 of the display panel 910, and the demultiplexer circuit 930 may selectively connect the output channels OC1 and OC2 of the data driver 950 to the plurality of data lines DL1, DL2, DL3 and DL4 in response to a first connection control signal CLA and a second connection control signal CLB from the controller 960. For example, as illustrated in
The scan driver 940 may generate scan signals SS1 and SS2 based on a scan control signal SCTRL received from the controller 960, and sequentially provide the scan signals SS1 and SS2 to the pixel circuits RPC1, GPC1, BPC1, GPC2, RPC2, GPC3, BPC2 and GPC4 on a row-by-row basis. For example, the scan driver 940 may provide a first scan signal SS1 to the first pixel circuits RPC1, GPC1, BPC1 and GPC2 in a first horizontal time (or a second period of the first horizontal time) of each frame period, and may provide a second scan signal SS2 to the second pixel circuits RPC2, GPC3, BPC2 and GPC4 in a second horizontal time (or a second period of the second horizontal time) of each frame period. In some embodiments, the scan control signal SCTRL may include, but not limited to, a scan start signal and a scan clock signal.
The data driver 950 may generate data voltages based on a data control signal DCTRL and output image data ODAT received from the controller 960, and the output channels OC1 and OC2 of the data driver 950 may provide the data voltages to the pixel circuits RPC1, GPC1, BPC1, GPC2, RPC2, GPC3, BPC2, and GPC4 through the plurality of data lines DL1, DL2, DL3 and DL4. In some embodiments, the data control signal DCTRL may include, but not limited to, an output data enable signal, a horizontal start signal and a load signal.
The controller 960 (e.g., a timing controller (“T-CON”)) may receive input image data IDAT and a control signal CTRL from an external host processor (e.g., an application processor (“AP”), a graphics processing unit (“GPU”) or a graphics card). In some embodiments, the control signal CTRL may include, but not limited to, a vertical synchronization signal VSYNC, a horizontal synchronization signal HSYNC, an input data enable signal and a master clock signal. The controller 960 may generate the output image data ODAT, the data control signal DCTRL, the scan control signal SCTRL and the connection control signals CLA and CLB based on the input image data IDAT and the control signal CTRL. The controller 960 may control the data driver 950 by providing the output image data ODAT and the data control signal DCTRL to the data driver 950, may control the scan driver 940 by providing the scan control signal SCTRL to the scan driver 940, and may control the demultiplexer circuit 930 by providing the connection control signals CLA and CLB to the demultiplexer circuit 930.
In the display device 900 according to embodiments, each frame period may include a plurality of horizontal times, and each horizontal time may include a first period and a second period. In the first period of the first horizontal time of a first frame period, the demultiplexer circuit 930 may connect the first output channel OC1 to the first data line DL1, and the first output channel OC1 may output a data voltage for a first color pixel (e.g., a red pixel) to the first data line DLL Further, in the second period of the first horizontal time of the first frame period, the demultiplexer circuit 930 may connect the first output channel OC1 to the second data line DL2, and the first output channel OC1 may output a data voltage for a second color pixel (e.g., a green pixel) to the second data line DL2. In contrast, in the first period of the first horizontal time of a second frame period, the demultiplexer circuit 930 may connect the first output channel OC1 to the second data line DL2, and the first output channel OC1 may output a data voltage for the second color pixel (e.g., the green pixel). Further, in the second period of the first horizontal time of the second frame period, the demultiplexer circuit 930 may connect the first output channel OC1 to the first data line DL1, and the first output channel OC1 may output a data voltage for the first color pixel (e.g., the red pixel) to the first data line DL1. Accordingly, since the rows affected by the coupling are switched between the first frame period and the second frame period, the display panel 910 of the display device 900 according to embodiments may display an image with uniform luminance.
Referring to
The processor 1110 may perform various computing functions or tasks. The processor 1110 may be an application processor (AP), a micro-processor, a central processing unit (“CPU”), etc. The processor 1110 may be coupled to other components via an address bus, a control bus, a data bus, etc. Further, in some embodiments, the processor 1110 may be further coupled to an extended bus such as a peripheral component interconnection (“PCI”) bus.
The memory device 1120 may store data for operations of the electronic device 1100. For example, the memory device 1120 may include at least one non-volatile memory device such as an erasable programmable read-only memory (“EPROM”) device, an electrically erasable programmable read-only memory (“EEPROM”) device, a flash memory device, a phase change random access memory (“PRAM”) device, a resistance random access memory (“RRAM”) device, a nano floating gate memory (“NFGM”) device, a polymer random access memory (“PoRAM”) device, a magnetic random access memory (“MRAM”) device, a ferroelectric random access memory (“FRAM”) device, etc. and/or at least one volatile memory device such as a dynamic random access memory (“DRAM”) device, a static random access memory (“SRAM”) device, a mobile dynamic random access memory (mobile DRAM) device, etc.
The storage device 1130 may be a solid state drive (“SSD”) device, a hard disk drive (“HDD”) device, a CD-ROM device, etc. The I/O device 1140 may be an input device such as a keyboard, a keypad, a mouse, a touch screen, etc. and an output device such as a printer, a speaker, etc. The power supply 1150 may supply power for operations of the electronic device 1100. The display device 1160 may be coupled to other components through the buses or other communication links.
In the display device 1160, at least one pixel circuit may drive a light emitting element located in a column different from a column in which the at least one pixel circuit is located. Accordingly, pixel having the same color may be connected to each data line, and thus power consumption for charging and discharging the data line may be effectively reduced. Further, in the display device 1160, an output order of data voltages in at least one horizontal time of a first frame period may be different from an output order of data voltages in a corresponding horizontal time of a second frame period. Accordingly, a display panel may display an image with uniform luminance.
The inventions may be applied to any display device 1160, and any electronic device 1100 including the display device 1160. For example, the inventions may be applied to a mobile phone, a smart phone, a tablet computer, a television (“TV”), a digital TV, a 3D TV, a wearable electronic device, a personal computer (“PC”), a home appliance, a laptop computer, a personal digital assistant (“PDA”), a portable multimedia player (“PMP”), a digital camera, a music player, a portable game console, a navigation device, etc.
The foregoing is illustrative of embodiments and is not to be construed as limiting thereof. Although a few embodiments have been described, those skilled in the art will readily appreciate that many modifications are possible in the embodiments without materially departing from the novel teachings and advantages of the present invention. Accordingly, all such modifications are intended to be included within the scope of the present invention as defined in the claims. Therefore, it is to be understood that the foregoing is illustrative of various embodiments and is not to be construed as limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2022-0103822 | Aug 2022 | KR | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 20170270868 | Li | Sep 2017 | A1 |
| 20180151145 | Lee | May 2018 | A1 |
| 20210233455 | Yang | Jul 2021 | A1 |
| Number | Date | Country |
|---|---|---|
| 1020190062679 | Jun 2019 | KR |
| Number | Date | Country | |
|---|---|---|---|
| 20240062704 A1 | Feb 2024 | US |
