1. Field of the Invention
The invention relates to an electronic apparatus and a driver of the electronic apparatus, and more particularly, to a display apparatus and a display driver.
2. Description of Related Art
With the blooming development in display technology, the market demands for performance requirements of a display panel are advancements in high resolution, high brightness and low-power consumption. However, with increases in a resolution of the display panel, because the amount of sub-pixels on the display panel also increases in order to display in high resolution, the manufacturing cost is also increased accordingly. In order to reduce the manufacturing cost of the display panel, a sub-pixel rendering method has been developed. A display apparatus generally uses different arrangements and designs of the sub-pixels to formulate a proper algorithm so that the resolution may be increased to a sub-pixel resolution when an image is displayed. Because the size of the sub-pixel is smaller than that of a pixel, the resolution that is visible by human eye (i.e., a visual resolution) may be increased. Further, from the perspective of low-power consumption, the display apparatus may also operate in a low-power mode based on requirements in practical applications. In the low-power mode, a more preferable user experience may be provided if the display apparatus is capable of continuously providing a favorable display quality.
The invention provides a display driver and a display apparatus, which are capable of taking into account both display quality and power-saving.
A display driver of the invention is configured to drive a display panel. The display panel is configured to display an image frame in a first display mode or a second display mode. The display driver includes a first display driving channel and a second display driving channel. The first display driving channel drives the display panel to display the image frame by using a sub-pixel rendering method in the first display mode. The second display driving channel drives the display panel to display the image frame by using the sub-pixel rendering method in the second display mode. The display panel includes a sub-pixel repeating unit. The sub-pixel repeating unit is repeatedly arranged to form the display panel. The sub-pixel repeating unit includes a plurality of pixel units. Each of the pixel units includes one to two sub-pixels. In the second display mode, the second display driving channel drives the sub-pixels on the display panel to display corresponding grayscales by using a plurality of gamma voltages. A voltage value of at least one gamma voltage among the gamma voltages is determined according to an arrangement of the sub-pixels on the display panel.
A display apparatus of the invention includes a display panel and a display driver. The display panel includes a sub-pixel repeating unit. The sub-pixel repeating unit is repeatedly arranged to form the display panel. The sub-pixel repeating unit includes a plurality of pixel units. Each of the pixel units includes one to two sub-pixels. The display panel is configured to display an image frame in a first display mode or a second display mode. The display driver is coupled to the display panel. The display driver includes a first display driving channel and a second display driving channel, and is configured to drive the display panel to display the image frame by using a sub-pixel rendering method. In the second display mode, the second display driving channel drives sub-pixels on the display panel to display corresponding grayscales by using a plurality of gamma voltages. A voltage value of at least one gamma voltage among the gamma voltages is determined according to an arrangement of the sub-pixels on the display panel.
According to an embodiment of the invention, in the display panel, each of the pixel units includes at least one of a first color sub-pixel, a second color sub-pixel and a third color sub-pixel. A voltage value of the at least one gamma voltage among the gamma voltages is determined according to at least one ratio relationship. The at least one ratio relationship is determined according to a first quantity ratio in a first direction and a second quantity ratio in a second direction occupied by the at least one of the first color sub-pixel, the second color sub-pixel and the third color sub-pixel in the sub-pixel repeating unit, on the basis of pixel units.
According to an embodiment of the invention, in the display panel, the pixel units include a first pixel unit and a second pixel unit. The first color sub-pixel and the second color sub-pixel are adjacently arranged to form the first pixel unit. The third color sub-pixel and the second color sub-pixel are adjacently arranged to form the second pixel unit.
According to an embodiment of the invention, in the display panel, the pixel units include a first pixel unit, a second pixel unit and a third pixel unit. The first color sub-pixel and the second color sub-pixel are adjacently arranged to form the first pixel unit. The third color sub-pixel and the second color sub-pixel are adjacently arranged to form the second pixel unit. The first color sub-pixel and the third color sub-pixel are adjacently arranged to form the third pixel unit.
According to an embodiment of the invention, in the display panel, the first color sub-pixel, the second color sub-pixel and the third color sub-pixel are adjacently arranged to form two pixel units among the pixel units.
According to an embodiment of the invention, in the display panel, each of the pixel units includes a single sub-pixel. The single sub-pixel includes the first color sub-pixel, the second color sub-pixel and the third color sub-pixel.
According to an embodiment of the invention, in the display panel, the first color sub-pixel, the second color sub-pixel and the third color sub-pixel are a red sub-pixel, a green sub-pixel and a blue sub-pixel respectively.
According to an embodiment of the invention, the sub-pixel includes a target driving sub-pixel. The second display driving channel determines whether to drive the target driving sub-pixel by using the at least one determined gamma voltage according to an edge relationship between the target driving sub-pixel and a plurality of the sub-pixels adjacent thereto in the second display mode.
According to an embodiment of the invention, the second display driving channel determines the edge relationship according to a most significant bit of sub-pixel data written in the target driving sub-pixel and the sub-pixels adjacent thereto.
According to an embodiment of the invention, the second display driving channel includes a data processing unit and a voltage output unit. The data processing unit is configured to determine the edge relationship according to the most significant bit of the sub-pixel data written in the target driving sub-pixel and the sub-pixels adjacent thereto. The voltage output unit is coupled to the data processing unit. The voltage output unit is configured to determine whether to drive the target driving sub-pixel by using the at least one determined gamma voltage according to the edge relationship between the target driving sub-pixel and the sub-pixels adjacent thereto.
According to an embodiment of the invention, the gamma voltages include a first gamma voltage, a second gamma voltage and a third gamma voltage. A voltage value of the third gamma voltage is determined according to the arrangement of the sub-pixels on the display panel. A voltage value of the first gamma voltage is less than a voltage value of the second gamma voltage. The voltage value of the third gamma voltage falls between the voltage values of the first gamma voltage and the second gamma voltage.
According to an embodiment of the invention, the gamma voltages further include a fourth gamma voltage. A voltage value of the fourth gamma voltage is further determined according to the arrangement of the sub-pixels on the display panel. The voltage value of the fourth gamma voltage falls between the voltage values of the first gamma voltage and the third gamma voltage.
According to an embodiment of the invention, the first display driving channel drives the display panel by using the first gamma voltage and the second gamma voltage in the first display mode.
According to an embodiment of the invention, the display driver further includes a selection unit. The selection unit selects to drive the display panel to display the image frame in the first display mode or the second display mode by using the first display driving channel or the second display driving channel according to a selection signal.
Based on the above, in the exemplary embodiments of the invention, when the display driver drives the sub-pixels to display the corresponding grayscales by using the gamma voltage determined according to the arrangement of the sub-pixels on the display panel both display quality and power-saving can be taken into account.
To make the above features and advantages of the invention more comprehensible, several embodiments accompanied with drawings are described in detail as follows.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
Specifically, in the present embodiment, the display driver 110 includes a first display driving channel 112, a second display driving channel 114 and a selection unit 116. The selection unit 116 is configured to select the first display driving channel 112 or the second display driving channel 114 to perform the data processing on the display data S1 according to a selection signal SEL. The first display driving channel 112 and the second display driving channel 144 output the driving signals S2 and S3 respectively, so that the display driver 110 may drive the display panel 120 to display the image frame in the first display mode or the second display mode.
In the present embodiment, the selection signal SEL is, for example, configured to select a signal transmission path for connecting to the second display driving channel 114 so that the display driver 110 may drive the display panel 120 by using the second display driving channel 114 when the display apparatus 100 needs to enter the low-power mode. In the present embodiment, a possible situation where the display apparatus 100 may require to enter the low-power mode includes, but not limited to, when the display apparatus 100 is in a standby state because it is not required to display a full image frame for a long period of time, or when users intend to set the display apparatus 100 to enter the low-power mode based on requirements in practical operation, or when an electric power of a power-supply unit for providing power to the display apparatus 100 is almost empty, or other possible situations when entering the low-power mode is required. It is possible that the display apparatus 110 will enter the low-power mode in at least three of aforesaid situations. Accordingly, the display driver 110 drives the display panel 120 by using the second display driving channel 114.
In the present embodiment, the first display driving channel 112 drives the display panel 120 to display the image frame by using the sub-pixel rendering method in the first display mode. Specifically, the first display driving channel 112 of the present embodiment includes a first voltage converter 210, an edge detection circuit 220, a pixel filtering circuit 230 and a second voltage converter 240. In one exemplary embodiment, the first voltage converter 210, the edge detection circuit 220, the pixel filtering circuit 230, and the second voltage converter 240 may, for example, be implemented by application-specific integrated circuits (ASIC) or field programmable gate arrays (FPGA), but the invention is not limited thereto.
In the first display mode, the first voltage converter 210 performs, for example, a gamma-to-linear conversion on a nonlinear gamma image signal of the display data S1 so as to convert the nonlinear gamma image signal into a linear signal. Next, the edge detection circuit 220 performs an edge detection on image frame information included in the linear signal. Subsequently, the pixel filtering circuit 230 performs a filtering operation on edge information of the image frame so as to improve a quality of the image frame to be displayed. Thereafter, the second voltage converter 240 performs a linear-to-gamma conversion on the linear signal on which the filtering operation is performed, so as to convert such linear signal into a nonlinear gamma voltage for outputting the driving signal S2 to drive the display panel 120 in the first display mode.
Therefore, in the first display mode, the first display driving channel 112 drives the display panel 120 by using, for example, a plurality of preset gamma voltages. For instance, in an embodiment, the first display driving channel 112 drives a plurality of sub-pixels on the display panel 120 to display corresponding grayscales by using, for example, gamma voltages V0, V255 and other preset gamma voltages in the first display mode.
In the present embodiment, the second display driving channel 114 drives the display panel 120 to display the image frame by using the sub-pixel rendering method in the second display mode. Specifically, the second display driving channel 114 includes a data processing unit 310 and a voltage output unit 320. The voltage output unit 320 is coupled to the data processing unit 310. In one exemplary embodiment, the data processing unit 310 may, for example, include a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a programmable controller, a programmable logic device (PLD) or other similar devices or a combination of the above devices. The voltage output unit 320 may include an output buffer for receiving the output of the data processing unit 310 and outputting the driving signal S3.
In the second display mode, the voltage output unit 320 drives the display panel 120 by using a plurality of gamma voltages. In the present embodiment, a voltage value of at least one gamma voltage among the gamma voltages for driving the display panel 120 is determined according to an arrangement of the sub-pixels on the display panel 120. For instance, in the present embodiment, the arrangement of the sub-pixels may be evaluated by at least one ratio relationship related to the arrangement of the sub-pixels, for example. The ratio relationship is, for example, determined according to the arrangement of the sub-pixels in different colors on the display panel 120 in different directions. Therefore, in the present embodiment, the voltage value of the at least one gamma voltage among the gamma voltages for driving the display panel 120 may be determined according to said ratio relationship, for example.
For instance, in an embodiment, the voltage output unit 320 drives the sub-pixels on the display panel 120 to display the corresponding grayscales by using, for example, gamma voltages V0, V186 and V255 in the second display mode. In this example, the gamma voltage V186 is, for example, determined according to the arrangement of the sub-pixels on the display panel 120, and the determined gamma voltage V186 falls between the gamma voltages V0 and V255. In other words, the gamma voltage V186 being an intermediate voltage between the two is determined based on the ratio relationship of the sub-pixels on the panel and configured to satisfy a demand for a color compensation on the sub-pixels arranged on the edges. In another embodiment, the voltage output unit 320 drives the sub-pixels on the display panel 120 to display the corresponding grayscales by using, for example, gamma voltages V0, V155, V212 and V255 in the second display mode. In this example, the gamma voltages V155 and V212 are, for example, determined according to the arrangement of the sub-pixels on the display panel 120, and the determined gamma voltages V155 and V212 fall between the gamma voltages V0 and V255. In the present embodiment, compared to the second display mode, the gamma voltages V0, V255 and the other preset gamma voltages for driving the display panel 120 are predetermined in the first display mode rather than being adjusted according to the ratio relationship related to the arrangement of the sub-pixels on the display panel 120. In other words, a minimum grayscale and a maximum grayscale of the display panel 120 are determined by the gamma voltages V0 and V255.
It should be noted that, although the present embodiment is described by using the display driver 110 which includes the two display driving channels as an example, the invention is not limited thereto. In an embodiment, a driving function of the second display driving channel 114 may also be realized as an integration with any circuitry block in the first display driving channel 112. Alternatively, the driving function of the second display driving channel 114 may also be realized as a circuitry block newly-added to the first display driving channel 112.
Embodiments are provided below to describe a method of the second display driving channel 114 for determining the gamma voltages, but the invention is not limited to the provided embodiments, and the provided embodiments can be suitably combined.
Referring to
In the present embodiment, the display driver 110 writes the pixel data P11 into the pixel unit 422R, for example, and the pixel data P11 and the pixel unit 422R both include one pixel width (WP) in both a X direction and a Y direction. In the present embodiment, because the pixel unit 422R only includes the red sub-pixel and the green sub-pixel, the display driver 110 drives the display panel 420 to display the image frame by using the sub-pixel rendering method. In the sub-pixel rendering method, in order to display the pixel data P11 having red, blue and green, the pixel unit 422R which only includes the red sub-pixel and the green sub-pixel may at least cooperate with the pixel units 422B adjacent thereto to compensate its lacking of the blue sub-pixel, so as to collaboratively display the pixel data P11. Similarly, in the sub-pixel rendering method, in order to display the pixel data P12 having red, blue and green, the pixel unit 422B which only includes the blue sub-pixel and the green sub-pixel may at least cooperate with the pixel units 422R adjacent to the left or the right to compensate its lacking of the red sub-pixel, so as to collaboratively display the pixel data P12. This kind of method which uses the adjacent pixel units to collaboratively display the same pixel data may be regarded as the sub-pixel rendering method, but the invention is not limited thereto. In other embodiments, it is also possible that various modifications may be made to the driving method of the display driver 110 for driving the display panel 420 to display the image frame by using the sub-pixel rendering method.
Hereinafter, referring to
After the voltage value of the gamma voltage V186 is determined according to the arrangement of the sub-pixels on the display panel 420, the voltage output unit 320 determines whether to drive a target driving sub-pixel by using the determined gamma voltage V186 according to an edge relationship between the target driving sub-pixel and a plurality of the sub-pixels adjacent thereto. For instance, in the present embodiment, in the case where the target driving sub-pixel is the blue sub-pixel of the pixel unit 422B in
Accordingly, in the present embodiment, the voltage output unit 320 may be built-in with a look-up table, in which correspondence relationships between the sequences of the most significant bits and the gamma voltages are listed. The voltage output unit 320 may determine which one of the gamma voltages is to be used in correspondence to the corresponding edge relationship to drive the sub-pixel according to the look-up table.
Specifically, in the present embodiment, the display panel 520 includes a plurality of pixel units (522R, 522G, 522B), and each of the pixel units (522R, 522G, 522B) includes two sub-pixels. For instance, in the present embodiment, the pixel unit 522R includes, for example, the red sub-pixel and the green sub-pixel; the pixel unit 522B includes, for example, the blue sub-pixel and the red sub-pixel; and the pixel unit 522G includes, for example, the green sub-pixel and the blue sub-pixel. The three pixel units 522R, 522G and 522B including the sub-pixels in different colors are arranged in staggered arrangement on the display panel 520 in different directions, so as to form a sub-pixel array. In the present embodiment, each of the pixel units (522R, 522G, 522B) includes two sub-pixels.
In the present embodiment, parts of the sub-pixels of the display panel 520 are arranged into an array to form a sub-pixel repeating unit 530 of
In the present embodiment, apart from the gamma voltages V0, V212 and V255, the voltage output unit 320 further drives the sub-pixels on the display panel 520 by using, for example, a gamma voltage V155 in the second display mode. In the present embodiment, a voltage value of the gamma voltage V155 falls between the gamma voltages V0 and V212. Specifically, after the gamma voltage V212 is determined according to the ratio relationship of 2/3 together with the gamma voltage curve, a ratio relationship of 1/3 may be obtained from the ratio relationship of 2/3 divided by 2. The gamma voltage V155 is, for example, determined according to the ratio relationship of 1/3 together with a preset gamma voltage curve, and configured to drive the red, green and blue sub-pixels on the display panel 520. In other words, the gamma voltage V155 is also determined according to the arrangement of the sub-pixels on the display panel 520.
After the voltage values of the gamma voltages V155 and V212 are determined according to the arrangement of the sub-pixels on the display panel 520, the voltage output unit 320 determines whether to drive a target driving sub-pixel by using the determined gamma voltage V155 or V212 according to an edge relationship between the target driving sub-pixel and a plurality of the sub-pixels adjacent thereto. For instance, in the present embodiment, in the case where the target driving sub-pixel is the blue sub-pixel of the pixel unit 522B in
Furthermore, in the present embodiment, in the case where the target driving sub-pixel is the red sub-pixel of the pixel unit 522B in
Similarly, in the present embodiment, if the target driving sub-pixel is the green sub-pixel of the pixel unit 522G, whether the voltage output unit 320 uses the gamma voltage V155 or V212 for driving may also be determined by aforementioned determination method. For instance, in the case where a sequence of the most significant bit of the green sub-pixel data fetched by the data processing unit 310 is 010, the voltage output unit 320 may determine to drive the green sub-pixel of the pixel unit 522G by using the gamma voltage V212. If a sequence of the most significant bit of the green sub-pixel data fetched by the data processing unit 310 is 100 or 101, in this example, the voltage output unit 320 may determine to drive the green sub-pixel of the pixel unit 522G by using the gamma voltage V155. Further, in the present embodiment, if the target driving sub-pixel is the blue sub-pixel of the pixel unit 522G, whether the voltage output unit 320 uses the gamma voltage V155 or V212 for driving may also be determined by aforementioned determination method. For instance, in the case where a sequence of the most significant bit of the blue sub-pixel data fetched by the data processing unit 310 is 010 or 110, in this example, the voltage output unit 320 may determine to drive the blue sub-pixel of the pixel unit 522G by using the gamma voltage V212. If a sequence of the most significant bit of the blue sub-pixel data fetched by the data processing unit 310 is 001 or 101, in this example, the voltage output unit 320 may determine to drive the blue sub-pixel of the pixel unit 522G by using the gamma voltage V155.
Similarly, in the present embodiment, if the target driving sub-pixel is the red sub-pixel of the pixel unit 522R, whether the voltage output unit 320 uses the gamma voltage V155 or V212 for driving may also be determined by aforementioned determination method. For instance, in the case where a sequence of the most significant bit of the red sub-pixel data fetched by the data processing unit 310 is 010, in this example, the voltage output unit 320 may determine to drive the red sub-pixel of the pixel unit 522R by using the gamma voltage V212. If a sequence of the most significant bit of the red sub-pixel data fetched by the data processing unit 310 is 100 or 101, in this example, the voltage output unit 320 may determine to drive the red sub-pixel of the pixel unit 522R by using the gamma voltage V155. Further, in the present embodiment, if the target driving sub-pixel is the green sub-pixel of the pixel unit 522R, whether the voltage output unit 320 uses the gamma voltage V155 or V212 for driving may also be determined by aforementioned determination method. For instance, in the case where a sequence of the most significant bit of the green sub-pixel data fetched by the data processing unit 310 is 010 or 110, in this example, the voltage output unit 320 may determine to drive the green sub-pixel of the pixel unit 522R by using the gamma voltage V212. If a sequence of the most significant bit of the green sub-pixel data fetched by the data processing unit 310 is 001 or 101, in this example, the voltage output unit 320 may determine to drive the green sub-pixel of the pixel unit 522R by using the gamma voltage V155.
Specifically, in the present embodiment, the display panel 620 includes a plurality of sub-pixel combinations 622, which are composed of the first color sub-pixel, the second color sub-pixel and the third color sub-pixel adjacently arranged. Each of the sub-pixel combinations 622 includes two pixel units 622R and 622B. For instance, in the present embodiment, the sub-pixel combination 622 in which the red sub-pixel, the green sub-pixel and the blue sub-pixel are adjacently arranged includes, for example, the two pixel units 622R and 622B on the display panel 620. Because the pixel units 622R and 622B share three sub-pixels, each of the pixel units 622R and 622B includes one and half sub-pixel, and the pixel unit 622R includes one entire red sub-pixel and the pixel unit 622B includes one entire blue sub-pixel. The sub-pixel combinations 622 having three different colors are arranged on the display panel 620 in different directions to form a sub-pixel array. In the present embodiment, because the pixel data P11 and P12 are, for example, written into the same sub-pixel combination, the sub-pixel combination 622 includes two pixel widths (2WP) in the X direction.
In the present embodiment, parts of the sub-pixels of the display panel 620 are arranged into an array to form a sub-pixel repeating unit 630 of
After the voltage value of the gamma voltage V186 is determined according to the arrangement of the sub-pixels on the display panel 620, the voltage output unit 320 determines whether to drive a target driving sub-pixel by using the determined gamma voltage V186 according to an edge relationship between the target driving sub-pixel and a plurality of the sub-pixels adjacent thereto. In the present embodiment, the data processing unit 310 determines the edge relationship between the sub-pixels according to the most significant bit of the sub-pixel data written in the target driving sub-pixel and the sub-pixels adjacent thereto. In the present embodiment, sufficient teaching, suggestion, and implementation illustration regarding the method of the data processing unit 310 for determining the edge relationship between the sub-pixels may be obtained from the foregoing embodiments of
Specifically, in the present embodiment, the display panel 720 includes a plurality of pixel units (722R, 722G, 722B), and each of the pixel units (722R, 722G, 722B) includes one sub-pixel. For instance, in the present embodiment, the pixel unit 722R includes, for example, the red sub-pixel; the pixel unit 722B includes, for example, the blue sub-pixel; and the pixel unit 722G includes, for example, the green sub-pixel. The three pixel units 722R, 722G and 722B including the sub-pixels in different colors are arranged in staggered arrangement on the display panel 720 in different directions, so as to form a sub-pixel array. In the present embodiment, because the pixel data P11 is, for example, written into the sub-pixel 722R, the pixel data P11 and the sub-pixel 722R both include one pixel width (WP) in the X direction.
In the present embodiment, parts of the sub-pixels of the display panel 720 are arranged into an array to form a sub-pixel repeating unit 730 of
After the voltage value of the gamma voltage V186 is determined according to the arrangement of the sub-pixels on the display panel 720, the voltage output unit 320 determines whether to drive a target driving sub-pixel by using the determined gamma voltage V186 according to an edge relationship between the target driving sub-pixel and a plurality of the sub-pixels adjacent thereto. In the present embodiment, the data processing unit 310 determines the edge relationship between the sub-pixels according to the most significant bit of the sub-pixel data written in the target driving sub-pixel and the sub-pixels adjacent thereto. In the present embodiment, sufficient teaching, suggestion, and implementation illustration regarding the method of the data processing unit 310 for determining the edge relationship between the sub-pixels may be obtained from the foregoing embodiments of
In step S920, if the display driver 110 selects to drive the display panel 120 to display the image frame by using the first display driving channel 112 in the first display mode according to the selection signal SEL, the display driving method proceeds to execute step S930. In step S930, in the first display mode, the first display driving channel 112 drives the display panel 120 to display the image frame by using the gamma voltages V0, V255 and other preset gamma voltages.
In step S920, if the display driver 110 selects to drive the display panel 120 to display the image frame by using the second display driving channel 114 in the second display mode according to the selection signal SEL, the display driving method proceeds to execute step S940. In step S940, in the second display mode, the second display driving channel 114 determines an edge relationship between a target driving sub-pixel and the sub-pixels adjacent thereto according to a most significant bit of sub-pixel data written in the target driving sub-pixel and the sub-pixels adjacent thereto. Next, in step S950, in the second display mode, the second display driving channel 114 determines whether to drive the target driving sub-pixel by using the gamma voltage V186 determined in step S910 according to the edge relationship.
In step S950, if the second display driving channel 114 determines to drive the target driving sub-pixel by using the gamma voltage V186, the display driving method proceeds to execute step S960. In step S960, the second display driving channel 114 drives the target driving sub-pixel by using the gamma voltage V186. In step S950, if the second display driving channel 114 determines not to drive the target driving sub-pixel by using the gamma voltage V186, the display driving method proceeds to execute step S970. In step S970, the second display driving channel 114 drives the target driving sub-pixel by using the gamma voltage V0 or V255.
In addition, sufficient teaching, suggestion, and implementation illustration regarding the display driving method of the embodiments of the invention may be obtained from the above embodiments depicted in
In summary, in the exemplary embodiments of the invention, a voltage value of at least one gamma voltage among a plurality of gamma voltages for driving a display panel is determined according to a ratio relationship, and such ratio relationship is determined according to an arrangement of sub-pixels in different colors on the display panel in different directions. In a second display mode, a display driver according to the exemplary embodiments of the invention determines whether to drive the display panel by using the determined gamma voltage according to an edge relationship between the sub-pixels in a second display mode, so as to take into account both display quality and power-saving.
Although the present disclosure has been described with reference to the above embodiments, it will be apparent to one of ordinary skill in the art that modifications to the described embodiments may be made without departing from the spirit of the disclosure. Accordingly, the scope of the disclosure will be defined by the attached claims and not by the above detailed descriptions.
Number | Date | Country | Kind |
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104104731 | Feb 2015 | TW | national |
This application claims the priority benefits of U.S. provisional application Ser. No. 62/087,815, filed on Dec. 5, 2014 and Taiwan application serial no. 104104731, filed on Feb. 12, 2015. The entirety of each of the above-mentioned patent applications is hereby incorporated by reference herein and made a part of this specification.
Number | Date | Country | |
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62087815 | Dec 2014 | US |