Patent Application
20200193902
The disclosure relates to a display device and an operating method thereof; more particularly, the disclosure relates to a display device capable of automatically inspecting dark spots on pixels and compensating for the brightness of the dark spots to ensure that a display image can have uniform brightness and an operating method of the display device.
Nowadays, the structure of a micro light emitting diode (micro-LED) driven by a micro integrated circuit can only allow one single pixel to be driven at one time, which limits the time frame during which the pixel can emit light and may lead to the situation where brightness or levels of gray scale is insufficient. Besides, the number of micro-LEDs which can be driven is limited by the size of the micro integrated circuit, and the number of the micro integrated circuit is thus required to be increased. In addition, the wiring manner of the common micro-LED display device driven by the micro integrated circuit is complicated, which poses a limitation to the number of pins, the gate driving circuit and the source driving circuit are all disposed outside, and therefore the effects of applying the micro-LED display device to a spliced panel are not satisfactory.
Hence, according to the existing technology applied to the display device, in order to improve the quality of display images, researches associated with the issue of ensuring uniform brightness and determining and correcting dark spots on pixels as well as compensating for brightness of the dark spots on pixels have been made, and how to ensure the uniform brightness of the display images and also detect and correct the dark spots and compensate for the brightness of the dark spots has become an important topic.
The disclosure provides a display device and an operating method thereof, which can automatically inspect dark spots on pixels and compensate brightness of the dark spots, so as to ensure the uniform brightness of a display image.
According to an embodiment of the disclosure, a display device includes a first light emitting diode (LED), a first switch, a second switch, a second LED, a third switch, and a first controller. A first terminal of the first switch receives a first electrical signal, and a second terminal of the first switch is coupled to an anode of the first LED. A first terminal of the second switch receives a second electrical signal, and a second terminal of the second switch is coupled to a cathode of the first LED. An anode of the second LED is coupled to the cathode of the first LED. A first terminal of the third switch receives a third electrical signal, and a second terminal of the third switch is coupled to a cathode of the second LED. Here, whether the first switch, the second switch, and the third switch are switched on or off is determined by whether the first LED and the second LED are damaged or not. The first controller is configured to detect whether the first LED and the second LED are damaged or not, generate the second electrical signal and the electrical signal, and generate a plurality of control signals controlling the first switch to the third switch.
According to an embodiment of the disclosure, a display device includes a first LED, a first switch, a second switch, a second LED, a third switch, a fourth switch, and a first controller. A first terminal of the first switch receives a first electrical signal, and a second terminal of the first switch is coupled to an anode of the first LED. A first terminal of the second switch receives a second electrical signal, and a second terminal of the second switch is coupled to the anode of the first LED. An anode of the second LED is coupled to the anode of the first LED. A first terminal of the third switch receives a third electrical signal, and a second terminal of the third switch is coupled to a cathode of the first LED. A first terminal of the fourth switch receives the third electrical signal, and a second terminal of the fourth switch is coupled to a cathode of the second LED. Here, whether the first switch, the second switch, the third switch, and the fourth switch are switched on or off is determined by whether the first LED and the second LED are damaged or not. The first controller is configured to detect whether the first LED and the second LED are damaged or not, generate the second electrical signal and the electrical signal, and generate a plurality of control signals controlling the first switch to the fourth switch.
According to an embodiment of the disclosure, an operating method of a display device includes: during an inspection time period, providing an inspection signal to a first LED and a second LED coupled to each other and determining a damaged state of the first LED and a damaged state of the second LED by detecting a voltage at a point where the first LED and the second LED are coupled; selecting two of a first electrical signal, a second electrical signal, and a third electrical signal according to the determined damaged states and applying the two selected electrical signals respectively to two terminals of the undamaged LED; adjusting an intensity of one of the two selected electrical signals according to the determined damaged states.
In view of the above, the display device controls a plurality of switches through the first controller, so as to detect whether the first LED and the second LED are damaged or not (i.e., detect whether there is any dark spot on pixels due to damages to the LEDs), and a plurality of control signals, the second electric signal, and the third electric signal are provided to the switches according to the damaged states of the first LED and the second LED, so as to compensate for the brightness of the dark spots on the pixels. As such, the effects of automatic inspection and compensation for the dark spots on the pixels can be achieved, and the brightness of the display image is uniform.
To make the above features and advantages provided in one or more of the embodiments of the disclosure 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 disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles described herein.
In the accompanying drawings, thicknesses of layers, films, panels, regions and so on are exaggerated for clarity. Throughout the specification, the same reference numerals in the accompanying drawings denote the same elements. It should be understood that when an element such as a layer, film, region or substrate is referred to as being “on” or “connected to” another element, it can be directly on or connected to the other element, or intervening elements may also be present. In contrast, when an element is referred to as being “directly on” or “directly connected to” another element, there is no intervening element present. As used herein, the term “connected” may refer to physically connected and/or electrically connected. Besides, “electrical connection” or “coupling” may be referred to as an intervening element existing between two elements.
In another aspect, the controller 110 is configured to detect whether the LED1 and the LED2 are damaged or not, generate the electrical signal ECP2 and the electrical signal ECP3, and generate a plurality of control signals (e.g., control signals U1-U3) controlling the switches S1-S3. Particularly, the controller 110 of the display device 100 provided in the present embodiment can provide the control signals U1-U3 at an enabling voltage level to switch on the switches S1-S3, so as to detect damaged states of the LED1 and the LED2 according to the voltage on the cathode of the LED1 and respectively provide the control signals U1-U3 to the switches S1-S3 according to the damage states of the LED1 and LED2. As such, in response to the different damaged states of the LED1 and the LED2, the switches S1-S3 are switched on or off, so as to perform a compensation operation on the dark spots on pixels. That is, the LED1, the LED2, and the switches S1-S3 provided herein can be considered as one set of pixel circuit, and the controller 110 is applied to detect the pixel circuit, so as to determine whether there is any dark spot on the pixels due to damages to the LED1 and the LED2 and whether the compensation operation on the dark spots on pixels is required.
To be specific, please refer to
For instance, when the controller 110 detects that the voltage on the cathode of the LED1 is obtained by subtracting the voltage at which the LED1 is switched on from the system voltage OVDD, it indicates that the LED1 and the LED2 are both in the normal state (i.e., not in the damaged state); when the controller 110 detects that the voltage on the cathode of the LED1 is the system voltage OVDD, it indicates that the LED1 is in the damaged state, while the LED2 is in the normal state; when the controller 110 detects that the voltage on the cathode of the LED1 is zero, it indicates that the LED2 is in the damaged state, and the LED1 is in the normal state. Here, the damaged state may refer to an open circuit (or short circuit) due to damages to the LEDs, for instance. Thereby, the controller 110 can be applied to automatically and instantly detect the voltage on the cathode of the LED1, so as to perform the automatic inspection while there is any damage to the LED1 and the LED2 and carry out the compensation operation on the dark spots on pixels.
While the LEDs are in different damaged states, the circuit operations of the display device 100 are elaborated hereinafter. Please refer to
In another aspect, with reference to
That is, the controller 110 at this time generates the driving current Idr2 by providing the system voltage OVDD and the drain current SOU2, so that the driving current Idr2 switches on the LED2, and the transistor T2, the LED2, the transistor T3, and the controller 110 can constitute a loop, which allows the LED2 to perform the compensation operation on the dark spots on pixels. Note that the driving current Idr2 is greater than the driving current Idr1 (i.e., the driving current while both the LED1 and the LED2 are undamaged), and thus the brightness of the LED2 herein is N times the original brightness of the LED2, wherein N is a real number.
That is, in the present embodiment, when the controller 110 determines that the LED1 is in the damaged state, the LED2 is driven by a relatively large driving current Idr2, so that the brightness of the LED2 is greater than the brightness when the LED1 and the LED2 are not damaged. For instance, when both the LED1 and the LED2 are not damaged, the driving current Idr1 can be applied to drive the LED1 and the LED2, so as to ensure the LED1 to have a first brightness (e.g., 50% of the brightness of one single pixel) and ensure the LED2 to have a second brightness (e.g., 50% of the brightness of one single pixel). As such, the brightness of the pixels of the LED1 and the LED2 is 100% of the brightness of one single pixel. When the controller 110 determines that the LED1 is in the damaged state, the LED2 is driven by a relatively large driving current Idr2, so that the LED2 has a relatively large brightness (e.g., 100% of the brightness of one single pixel). Thereby, if the LED1 is damaged (i.e., the LED1 is a dark spot on pixels), the LED2 having the relatively large brightness can compensate for the brightness of the dark spot on the pixels according to one or more embodiments of the disclosure, so as to maintain the brightness of the display device 100 (i.e., 100% of the brightness of one single pixel) and achieve automatic inspection of the dark spots on pixels as well as perform the compensation operation for brightness. As such, the display image can have the uniform brightness.
When the controller 110 determines that the LED1 is in the damaged state, it should be mentioned that a source current may also be applied to drive the LED2 as a pixel compensation. Please refer to
That is, the controller 110 at this time generates the driving current Idr3 by providing the system voltage OVDD and the source current SOU3, so that the driving current Idr3 switches on the LED2, and the transistor T2, the LED2, the transistor T3, and the controller 110 can constitute a loop. Note that the driving current Idr3 is also greater than the driving current Idr1, and thus the brightness of the LED2 is N times the original brightness of the LED2 for compensating for the brightness of the dark spots on pixels.
Please refer to
That is, the controller 110 at this time generates the driving current Idr4 with the electrical signal ECP2 (i.e., the system voltage OVDD) by providing the drain current SOU4, the driving current Idr4 switches on the LED1, and the transistor T1, the LED1, the transistor T2, and the controller 110 can constitute an electric current path, which allows the LED2 to perform the compensation operation on the dark spots on pixels. Note that the driving current Idr4 is also greater than the driving current Idr1, and thus the brightness of the LED1 is N times the original brightness of the LED1, wherein N is a real number.
Please refer to
Specifically, a first terminal of the transistor T31 receives the system voltage OVDD (e.g., the electrical signal ECP1 provided in the embodiment shown in
A first terminal of the transistor T34 receives the system voltage OVDD through the transistor T40, and a second terminal of the transistor T34 is coupled to an anode of the LED33. A first terminal of the transistor T35 receives an electrical signal ECP22, and a second terminal of the transistor T35 is coupled to a cathode of the LED33. An anode of the LED34 is coupled to the cathode of the LED33. A first terminal of the transistor T36 receives an electrical signal ECP32, and a second terminal of the transistor T36 is coupled to a cathode of the LED34, wherein whether the transistors T34-T36 are switched on or off is determined by whether the LED33 and the LED34 are damaged or not. A first terminal of the transistor T37 receives the system voltage OVDD through the transistor T40, and a second terminal of the transistor T37 is coupled to an anode of the LED35. A first terminal of the transistor T38 receives an electrical signal ECP23, and a second terminal of the transistor T38 is coupled to a cathode of the LED35. An anode of the LED36 is coupled to the cathode of the LED35. A first terminal of the transistor T39 receives an electrical signal ECP33, and a second terminal of the transistor T39 is coupled to a cathode of the LED36, wherein whether the transistors T37-T39 are switched on or off is determined by whether the LED35 and the LED36 are damaged or not. A first terminal of the transistor T40 receives the system voltage OVDD, a second terminal of the transistor T40 is coupled to the transistors T31, T34, and T37, and a control terminal of the transistor T40 receives a control signal GP_U provided by the controller 310, wherein the transistor T40 is switched on according to the control signal GP_U, so as to transmit the system voltage OVDD. By the way, the control signals U31-U39 and the control signal GP_U can be pulse width modulation (PWM) signals, for instance, which should however not be construed as a limitation in the disclosure.
Next, please refer to
After the inspection on the LED31 and the LED32 is completed, the controller 310 detects the LED33 and the LED34 in the pixel circuit PC2, and the controller 310 respectively provides the control signals U34-U36 at the enabling voltage level to the transistors T34-T36, so as to switch on the transistors T34-T36 to determine whether the LED33 and the LED34 are damaged or not according to a voltage on the cathode of the LED33. After the inspection on the LED33 and the LED34 is completed, the controller 310 then detects the LED35 and the LED36 in the pixel circuit PC3 and respectively provides the control signals U37-U39 at the enabling voltage level to the transistors T37-T39, so as to switch on the transistors T37-T39 to determine whether the LED35 and the LED36 are damaged or not according to a voltage on the cathode of the LED35.
To simplify the description, according to the present embodiment, the LED31 and the LED32 in the pixel circuit PC1, the LED33 and the LED34 in the pixel circuit PC2, and the LED35 and the LED36 in the pixel circuit PC3 are sequentially inspected in the inspection time period TA; however, the order of inspecting the LEDs in each pixel circuit is not limited herein. That is, the LED33 and the LED34 in the pixel circuit PC2 or the LED35 and the LED36 in the pixel circuit PC3 can also be inspected at first. In other embodiments of the disclosure, the LEDs of the pixel circuits PC1-PC3 can be simultaneously inspected, and thus people having ordinary skill in the art can made proper adjustments to the order of inspecting the LEDs in each pixel circuit according to actual application scenarios, and the illustration in
When the controller 310 determines that the LEDs in each of the pixel circuits PC1-PC3 are not damaged, next, in a display time period TB, the controller 310 respectively provides the control signals U31, U33, U34, U36, U37, and U39 at the enabling voltage level to the corresponding transistors, so as to switch on the transistors T31, T33, T34, T36, T37, and T39 and further generate a driving current Idr31 to drive the LED31 and the LED32, generate a driving current Idr32 to drive the LED33 and the LED34, and generate a driving current Idr33 to drive the LED35 and the LED36. As such, the display device 300 is allowed to perform the normal display operation.
In the present embodiment, note that light emitting wavelengths of the LED31 and the LED32 are equal, and the LED31 and the LED32 can be red LEDs, for instance. Light emitting wavelengths of the LED33 and the LED34 are equal, and the LED33 and the LED34 can be green LEDs, for instance. Light emitting wavelengths of the LED354 and the LED36 are equal, and the LED35 and the LED36 can be blue LEDs, for instance. In other words, the light emitting wavelengths of the LED31 and the LED32 can be different from the light emitting wavelengths of the LED33 and the LED34, and the light emitting wavelengths of the LED31 and the LED32 can also be different from the light emitting wavelengths of the LED35 and the LED36. In other embodiments of the disclosure, note that the light emitting wavelengths of the LED31 and the LED32 can also be equal to those of the LED33 to the LED36, which should not be construed as a limitation in the disclosure, and thus people having ordinary skill in the art can made proper adjustments to the light emitting wavelengths of the LED31 to the LED36 according to actual application scenarios.
As such, when the controller 310 detects that there is any damage to the LEDs in the pixel circuits PC1-PC3, each pixel circuit can perform mutual compensation operations with use of the LEDs having the same light emitting wavelength. To be specific, please refer to
Besides, in other embodiments of the disclosure, when the light emitting wavelengths of the LEDs in all pixel circuits are equal (e.g., the LEDs of all pixel circuits are the red LEDs, the green LEDs, or the blue LEDs), and if one of the two LEDs in one pixel circuit is damaged, the controller 310 drives the LEDs in the adjacent pixel circuit by a relatively large driving current, so as to increase the brightness of the LEDs in the adjacent pixel circuit for compensation. For instance, when at least one of the LED33 and the LED34 in the pixel circuit PC2 is in the damaged state, the controller 310 drives the LEDs (i.e., the LED31 and the LED32 in the pixel circuit PCI or the LED35 and the LED36 in the pixel circuit PC3) in the adjacent pixel circuit by a relatively large driving current, so as to compensate for the dark spots on pixels due to damages to the at least one of the LEDs. As such, the effects of automatic inspection and compensation for the brightness of the dark spots on the pixels can be achieved, and the brightness of the display image is uniform.
In another aspect, please refer to
The state multiplexer 314 is coupled to the data receiver 312. When the display device 300 enters the inspection time period TA, the state multiplexer 314 detects a voltage on the cathode of the first LED (e.g., the LED31, the LED33, the LED35) in each pixel circuit, so as to determine the damaged state of each of the LED31 to LED36, adjust the control signals U31-U39 to be at the enabling voltage level or the disabling voltage level corresponding to the damaged state of each of the LED31 to LED36, and simultaneously generate an inspection result signal DER and provide to the electric current selector 313. The electric current selector 313 is coupled to the data receiver 312 and selects a drain current, a source current, or a reference ground voltage as the electrical signals ECP21-ECP33 according to the inspection result signal DER provided by the state multiplexer 314.
For instance, when the state multiplexer 314 determines that the LED31 and the LED32 are both in the normal state according to the voltage on the cathode of the LED31 in the pixel circuit PC1, the electric current selector 313 provides a drain current SOU1 as the electrical signal ECP31 according to the inspection result DER. For instance, when the state multiplexer 314 determines that the LED32 is in the damaged state, and that the LED31 is in the normal state according to the voltage on the cathode of the LED31 in the pixel circuit PC1, the electric current selector 313 provides a drain current SOU4 as the electrical signal ECP21 according to the inspection result signal DER.
When the state multiplexer 314 determines that the LED31 is in the damaged state, and the LED32 is in the normal state according to the voltage on the cathode of the LED31 in the pixel circuit PC1, the electric current selector 313 provides the drain current SOU2 as the electrical signal ECP31 according to the inspection result signal DER and provides the system voltage OVDD as the electrical signal ECP21. When the state multiplexer 314 determines that the LED31 is in the damaged state and that the LED32 is in the normal state according to the voltage on the cathode of the LED31 in the pixel circuit PC1, note that the electric current selector 313 can also provide the source current SOU3 as the electrical signal ECP21 according to the inspection result signal DER and provide the reference ground voltage GND as the electrical signal ECP31. Note that whether the electric current selector 313 decides to provide the drain current or the source current can be set by the user or automatically set by the electric current selector 313, which should not be construed as a limitation in the disclosure. Besides, the shift register 315 included in the controller 310 provided in the present embodiment is configured to generate a plurality of gate driving signals for driving a plurality of thin film transistors. As such, in one or more embodiments of the disclosure, the shift register can be disposed in the controller, so that the display device provided herein can achieve favorable effects while it is applied to the spliced panels of the display device.
Note that how the controller 310 determines whether the LEDs in each pixel circuit are damaged or not as well as the circuit operations and the signal waveforms of each pixel while the LEDs therein perform the compensation operation on the dark spots on pixels are similar to those provided in the embodiment depicted in
With reference to
According to the previous descriptions, it can be easily learn that in the display device 400 provided in the present embodiment, when controller 410 detects that there is any damage to the LEDs in the pixel circuits PC41-PC46, each pixel circuit can perform mutual compensation operations with use of the LEDs having the same light emitting wavelength. For instance, when at least one of the two LEDs in the pixel circuit PC42 is damaged, the controller 410 can drive the LEDs in the adjacent pixel circuits (i.e., the pixel circuits PC41 and PC43) by a relatively large driving current, so as to compensate for the dark spots on pixels due to damages to the LEDs in the pixel circuit PC42. Besides, when at least one of the two LEDs in the pixel circuit PC42 is damaged, the controller 410 provided in the present embodiment can also drive the LEDs in the pixel circuits (i.e., the pixel circuits PC44-PC46) on the opposite side by a relatively large driving current, so as to compensate for the dark spots on pixels due to damages to the LEDs in the pixel circuit PC42. In other words, the display device 400 provided in the present embodiment not only can compensate for the dark spots on pixels in the adjacent pixel circuits but also allows mutual compensation between the pixel circuits PC41-PC43 on the first side Sid1 and the pixel circuits PC44-PC46 on the second side Sid2.
In order to simplify the description, note that only three pixel circuits are illustrated on the first side Sid1 and the second side Sid2 of the controller 410 as an exemplary embodiment in the drawings, whereas the number of the pixel circuits coupled to different sides of the controller 410 is not limited in the disclosure, i.e., the illustration in
With reference to
In another aspect, when the controller 512 determines that the two LEDs (e.g., the LED101 and the LED102 in the pixel circuit PC102) in the corresponding pixel circuit are both in the damaged state, the controller 512 generates a relatively large driving current to drive the LED91 and the LED92 and transmits the compensation signal to the controller 516, and the controller 516 provides the control signals to the switches in the pixel circuit PC112 according to the compensation signal, so as to generate a relatively large driving current to drive the LED111 and the LED112. As such, the LED92 of the pixel circuit PC92 and the LED111 of the pixel circuit PC112 can simultaneously compensate for the brightness of the dark spots on pixels due to the damages to the LED101 and the LED102.
Additionally, when the controller 513 determines that one of the two LEDs (e.g., the LED142 in the pixel circuit PC142) in the corresponding pixel circuit is in the damaged state, and the adjacent controller 517 determines that one of the two LEDs (e.g., the LED151 in the pixel circuit PC152) in the corresponding pixel circuit is in the damaged state, the controller 513 generates a relatively large driving current to drive the LED141 and transmits the compensation signal to the controller 517, and the controller 517 generates a relatively large driving current to drive the LED152 according to the compensation signal and the damaged state of the LED151, so that the LED141 of the pixel circuit PC142 and the LED152 of the pixel circuit PC152 can simultaneously compensate for the brightness of the dark spots on pixels due to the damages to the LED142 and the LED151.
In another aspect, when the controller 514 determines that one of the two LEDs (e.g., the LED171 in the pixel circuit PC172) in the corresponding pixel circuit is in the damaged state, and the adjacent controller 518 determines that one of the two LEDs (e.g., the LED181 in the pixel circuit PC182) in the corresponding pixel circuit is in the damaged state, the controller 514 generates a relatively large driving current to drive the LED172 and transmits the compensation signal to the controller 518, and the controller 518 generates a relatively large driving current to drive the LED182 according to the compensation signal and the damaged state of the LED181, so that the LED171 of the pixel circuit PC172 and the LED182 of the pixel circuit PC182 can simultaneously compensate for the brightness of the dark spots on pixels due to the damages to the LED171 and the LED181.
According to the previous descriptions, it can be easily learn that in the display device 500 provided in the present embodiment, when the controllers 511-518 detect that there is any damage to the LEDs in the corresponding pixel circuits, each of the controllers 511-518 can perform the mutual compensation operation on the LEDs in the pixel circuits with use of the LEDs having the same light emitting wavelength. Note that the structure of each pixel circuit provided in the present embodiment is similar to those provided in the embodiments depicted in
With reference to
In another aspect, the controller 610 is configured to detect whether the LED61 and the LED62 are damaged or not, generate the electrical signal ECP2 and the electrical signal ECP3, and generate a plurality of control signals (e.g., control signals U61-U64) controlling the transistors T61-T64. By the way, the control signals U61-U64 can be PWM signals, for instance, which should however not be construed as a limitation in the disclosure. Particularly, the controller 610 of the display device 600 provided in the present embodiment can provide the control signals U61-U64 at the enabling voltage level to switch on the transistors T61-T64, so as to detect the damaged states of the LED61 and the LED62 according to the voltages on the anodes of the LED61 and the LED62 and respectively provide the control signals U61-U64 to the transistors T61-T64 according to the damage states of the LED61 and LED62. As such, in response to the different damaged states of the LED61 and the LED62, the transistors T61-T64 are switched on or off, so as to perform the compensation operation on the dark spots on pixels. That is, the LED61, the LED62, and the transistors T61-T64 provided herein can be considered as one set of pixel circuit, and the controller 610 is applied to detect the pixel circuit, so as to determine whether there is any dark spot on the pixels due to damages to the LED61 and the LED62 and whether the compensation operation on the dark spots on pixels is required.
More particularly, please refer to
After the inspection on the LED61 is completed, in a second inspection time period P2 following the first inspection time period P1, the controller 610 respectively provides the control signals U61, U62, and U64 at the enabling voltage level to the transistors T61, T62, and T64, so as to switch on the transistors T61, T62, and T64 to determine whether the LED62 is damaged or not according to a voltage on the anode of the LED62. Here, in the first inspection time period P1 and the second inspection time period P2, the system voltage OVDD is at the high voltage level.
Specifically, in the first inspection time period P1, when the controller 610 detects that the voltage on the anode of the LED61 is the system voltage OVDD, it indicates that the LED1 at this time is in the normal state; when the controller 610 detects that the voltage on the anode of the LED61 is zero, it indicates that the LED1 at this time may be in the damaged state. Similarly, in the second inspection time period P2, when the controller 610 detects that the voltage on the anode of the LED62 is the system voltage OVDD, it indicates that the LED2 at this time is in the normal state; when the controller 610 detects that the voltage on the anode of the LED62 is zero, it indicates that the LED2 at this time may be in the damaged state. Thereby, the controller 610 can be applied to automatically and instantly detect the voltages on the anodes of the LED61 and the LED62, so as to perform the automatic inspection while there is any damage to the LED61 and the LED62 and carry out the compensation operation on the dark spots on pixels.
According to the present embodiment, note that the LED61 is inspected in the first inspection time period P1, and then the LED62 is inspected in the second inspection time period P2. However, the order of inspecting each LED is not limited in the disclosure, and it is likely to firstly inspect the LED62 and then inspect the LED61 in other embodiments of the disclosure. The illustration in
After that, with reference to
In another aspect, with reference to
That is, the controller 610 at this time provides the drain current SOU62, so as to generate the driving current Idr63 with the electrical signal ECP3 (i.e., the system voltage OVDD), the driving current Idr63 switches on the LED62, and the transistor T61, the LED62, the transistor T62, the transistor T64, and the controller 610 can constitute an electric current path, which allows the LED62 to perform the compensation operation on the dark spots on pixels. Note that the driving current Idr63 is greater than the driving current Idr61 and the driving current Idr62 (i.e., the driving currents while both the LED61 and the LED62 are undamaged), and thus the brightness of the LED62 herein is N times the original brightness of the LED62, wherein N is a real number.
That is, in the present embodiment, when the controller 610 determines that the LED61 is damaged, a relatively large driving current Idr63 is provided to drive the LED62, so as to ensure that the brightness of the LED62 is greater than the brightnesses of the undamaged LED61 and the undamaged LED62. Thereby, if the LED61 is damaged (i.e., the LED61 is a dark spot on pixels), the LED62 having the relatively large brightness can compensate for the brightness of the LED61 according to one or more embodiments of the disclosure, so as to maintain the brightness of the display device 600 and achieve automatic inspection of the dark spots on pixels as well as perform the compensation operation for brightness. As such, the display image can have the uniform brightness.
In another aspect, when the controller 610 determines that the LED61 is in the damaged state, another embodiment is provided to describe that a source current may also be applied to drive the LED62 as a compensation for the dark spots on pixels. With reference to
That is, the controller 610 at this time generates the driving current Idr64 by providing the system voltage OVDD and the source current SOU63 and enables the driving current Idr64 to switch on the LED62, so that the transistor T62, the LED62, the transistor T64, and the controller 610 can constitute a driving loop. Note that the driving current Idr64 is also greater than the driving currents Idr61 and Idr62, and thus the brightness of the LED62 is N times the original brightness of the LED62 for compensating for the brightness of the dark spots on pixels.
When the controller 610 determines that the LED61 is in the damaged state, it should be mentioned that a source current may also be applied to drive the LED62 as a compensation for the dark spots on pixels. Please refer to
That is, the controller 610 at this time generates the driving current Idr65 by providing the system voltage OVDD and the source current SOU64 and enables the driving current Idr65 to switch on the LED62, so that the transistor T62, the LED62, the transistor T64, and the controller 610 can constitute a driving loop. Note that the driving current Idr65 is also greater than the driving currents Idr61 and Idr62, and thus the brightness of the LED62 is N times the original brightness of the LED62 for compensating for the brightness of the dark spots on pixels.
According to the present embodiment, it should be mentioned that when the LED62 in the display device 600 is in the damaged state, and the LED61 is in the normal state, the compensation operation performed on the dark spots on pixels and the circuit operations described herein are similar to those provided in the previous embodiment, i.e., when the LED62 is in the normal state and the LED61 is in the damaged state; therefore, no further explanation is provided hereinafter. Besides, note that the circuit structures provided in the previous embodiments depicted in
With reference to
Note that the implementation details of the steps S810 to S830 are elaborated in the previous embodiments, and therefore no further explanation is provided hereinafter.
To sum up, in one or more embodiments of the disclosure, the display device controls a plurality of switches through the first controller, so as to detect the first LED and the second LED and determine whether the first LED and the second LED are damaged or not (i.e., determine whether there is any damage to the LEDs, thus leading to the dark spots on pixels), and a plurality of control signals, the second electric signal, and the third electric signal are provided to the switches according to the damaged states of the first LED and the second LED, so as to compensate for the LEDs. As such, the effects of automatic inspection and compensation for the dark spots on the pixels can be achieved, and the brightness of the display image is uniform.
It will be apparent to those skilled in the art that various modifications and variations can be made to the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure covers modifications and variations provided that they fall within the scope of the following claims and their equivalents.
| Number | Date | Country | Kind |
|---|---|---|---|
| 107144886 | Dec 2018 | TW | national |
This application claims the priority benefit of Taiwan application serial no. 107144886, filed on Dec. 12, 2018. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
