CN110570823A - Timing controller, display device and screen display method - Google Patents

Abstract

A timing controller, a display device and a screen display method, wherein the screen display method includes the following steps: receiving a brightness control signal by the timing controller to control the backlight module control unit to adjust the first brightness value to a second brightness value; The controller determines whether the difference between the second brightness value and the first brightness value is greater than the threshold value; and if the difference value is greater than the threshold value, the timing controller is used to compensate the image data after a specific period of time and use the compensated image data passed to the source driver.

Description

Timing controller, display device and screen display method

technical field

The disclosure document relates to a timing controller, a display device, and a screen display method, in particular to a timing controller, a display device, and a screen display method for red light compensation.

Background technique

With the rapid development of display technology, the quality requirements for display images are also continuously improved. In order to meet the conditions of the color space (Adobe RGB) developed by the Adobe system, blue light chips are used to respectively excite red and green phosphors to meet the requirements of Adobe RGB 100. Require. However, the reaction time of red phosphors is longer than that of other colors of phosphors. Therefore, when adjusting the brightness of the screen or turning off the power of the display panel, the remaining red wavelength will pass through the liquid crystal to form the red light seen by the human eye, resulting in a certain In some cases, the display panel will have an abnormal problem of flashing red light.

Contents of the invention

The first embodiment of the present invention is to provide a screen display method. The picture display method includes the following steps: the timing controller receives the brightness control signal to control the backlight module control unit to adjust the first brightness value to the second brightness value; the timing controller judges the difference between the second brightness value and the first brightness value Whether the value is greater than the threshold value; and if the difference value is greater than the threshold value, the timing controller is used to perform image data compensation after a specific period of time, and transmit the compensated image data to the source driver.

The second embodiment of the present invention is to provide a screen display method. The picture display method includes the following steps: the timing controller receives the brightness control signal to control the backlight module control unit to adjust the first brightness value to the second brightness value; the timing controller judges whether the first brightness value is greater than a threshold value; and If the first brightness value is greater than the threshold value, the timing controller is used to delay the backlight control signal for a specific period of time.

A third embodiment of the present invention is to provide a timing controller. The timing controller includes a picture control unit and a picture compensation unit. The picture control unit receives the brightness control signal, and controls the backlight module control unit to adjust the first brightness value to a second brightness value, and then judges whether the difference between the second brightness value and the first brightness value is greater than a threshold value. The frame compensation unit is electrically connected to the frame control unit. If the difference value is greater than a threshold value, the frame compensation unit is used to perform image data compensation after a specific period of time, and transmit the compensated image data to the source driver.

A fourth embodiment of the present invention provides a display device. The display device includes a source driver, a backlight module, a backlight module control unit and a timing controller. The timing controller is electrically connected with the source driver and the backlight module control unit to receive the brightness control signal and control the backlight module control unit to adjust the first brightness value to the second brightness value. The timing controller includes a picture control unit and a signal delay unit. The picture control unit is used for judging whether the first brightness value is greater than a threshold value. The signal delay unit is electrically connected to the picture control unit, and if the first brightness value is greater than a threshold value, the signal delay unit is used for delaying the backlight control signal for a specific period of time.

The timing controller, display device and screen display method of the present invention can prevent the display panel from adjusting the brightness or Is a technical effect that has a flashing red issue before closing.

Description of drawings

In order to make the above and other purposes, features, advantages and embodiments of the public document more obvious and understandable, the description of the attached drawings is as follows:

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present disclosure;

2 is a schematic diagram of a timing controller according to an embodiment of the disclosure;

FIG. 3 is a flowchart of a screen display method according to an embodiment of the disclosure;

FIG. 4 is a schematic diagram of a timing controller according to an embodiment of the present disclosure;

FIG. 5 is a flowchart of a screen display method according to an embodiment of the present disclosure;

FIG. 6 is a timing diagram of a shutdown of a display device according to an embodiment of the present disclosure;

FIG. 7 is a schematic diagram of a timing controller according to an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a source driver according to an embodiment of the present disclosure; and

FIG. 9 is a flowchart of a screen display method according to an embodiment of the disclosure.

Explanation of reference signs:

100: display device

110: Timing controller

120: Source driver

130: Gate driver

140: Backlight module control unit

150: Backlight module

160: Pixel circuit

111: Screen control unit

112: picture compensation unit

113: Signal delay unit

114, 121: frame buffer

122: Processor

Vdata, Vdata1, Vdata2: image data

CTL1, CTL2: control signal

VIN: power signal

VDATA: data voltage

VEN: backlight control signal

VPWM: pulse width modulation signal

TPS, TP1, TP2, TP3: time period

300, 500, 900: screen display method

S310, S320, S330, S510, S520, S530, S910, S920, S930, S940: steps

Detailed ways

Embodiments of the present invention will be described below in conjunction with related drawings. In the drawings, the same reference numerals represent the same or similar elements or method flows.

See Figure 1. FIG. 1 is a schematic diagram of a display device 100 according to an embodiment of the disclosure. As shown in FIG. 1 , the display device 100 includes a timing controller 110 , a source driver 120 , a gate driver 130 , a backlight module control unit 140 , a backlight module 150 and a pixel circuit 160 . The timing controller 110 is electrically connected to the source driver 120 , the gate driver 130 and the backlight module control unit 140 , and the backlight module control unit 140 is electrically connected to the backlight module 150 . The pixel circuit 160 is electrically connected to the source driver 120 , the gate driver 130 and the backlight module 150 .

Please refer to Figure 2 and Figure 3 together. FIG. 2 is a schematic diagram of the timing controller 110 according to an embodiment of the disclosure, and FIG. 3 is a flowchart of a screen display method 300 according to an embodiment of the disclosure. In one embodiment, the timing controller 110 includes a picture control unit 111 and a picture compensation unit 112 , and the picture control unit 111 is electrically coupled to the picture compensation unit 112 . In one embodiment, the screen display method 300 shown in FIG. 3 can be applied to the display device 100 shown in FIG. 1 and the timing controller 110 shown in FIG. The described steps compensate image data.

Continuing with the above embodiment, as shown in FIG. 3 , the screen display method 300 first executes step S310 , the screen control unit 111 receives the brightness control signal CTL1 to control the backlight module control unit 140 to adjust the first brightness value to the second brightness value. In one embodiment, when the user adjusts the brightness of the display device 100, the picture control unit 111 is used to control the backlight module control unit 140 to generate a pulse width modulation signal (Pulse Width Modulation, PWM) according to the brightness control signal CTL1 to control the backlight module. 150 glows.

Next, the picture display method 300 executes step S320, and the picture control unit 111 judges whether the difference between the second brightness value and the first brightness value is greater than a threshold value, and in step S330, if the difference value is greater than the threshold value, the picture compensation unit 112 uses The image data compensation is performed after a certain period of time, and the compensated image data is transmitted to the source driver 120 . In one embodiment, the image data compensation is used to modify the first image data Vdata1 to the second image data Vdata2 and transmit the second image data Vdata2 to the source driver 120 .

Based on the above, in detail, the first image data Vdata1 includes first red image data, first green image data, and first blue image data, and the frame compensation unit 112 is used to adjust the first red image data according to the image data comparison table. is the second red image data, and the second red image data, the first green image data and the first blue image data are combined into the second image data Vdata2. The image data comparison table may include information such as the maximum brightness value of the display device, brightness change, response time of the red phosphor, and decay time of the red phosphor, and then the compensation value of the red phosphor can be calculated according to the image data comparison table.

According to the above, the specific time period is the time required to display 5-10 frames of images, and the timing controller 110 is used to perform image data compensation within the time required to display 3-5 frames of images. For example, when the difference value is greater than the threshold value, the image compensation unit 112 is used to perform image data compensation after the time required to display 5-10 frames of images, and the duration of image data compensation is about 3-5 frames of display. The time required to frame the picture. Image data compensation is especially for red compensation. Assume that the original red sub-pixel grayscale value is 255. According to the image data comparison table, the red grayscale value that needs to be compensated is calculated as 20. When performing image data compensation for 3 to 5 frames, It will display the value of the original red sub-pixel gray scale value minus the compensation value (in this example, the red sub-pixel gray scale value is 235), and then combine the compensated red sub-pixel gray scale value with the original blue sub-pixel The gray scale value of the pixel and the gray scale value of the green sub-pixel are transmitted to the source driver 120 .

Please refer to Figure 1, Figure 4 and Figure 5 together. FIG. 4 is a schematic diagram of the timing controller 110 according to an embodiment of the disclosure, and FIG. 5 is a flowchart of a screen display method 500 according to an embodiment of the disclosure. In another embodiment, the timing controller 110 includes a frame control unit 111, a signal delay unit 113 and a frame buffer 114, the frame control unit 111 is electrically coupled to the signal delay unit 113 and the frame buffer 114, wherein the signal The frame buffer 114 is used for storing image data. In this embodiment, the screen display method 500 shown in FIG. 5 can be applied to the display device 100 shown in FIG. 1 and the timing controller 110 shown in FIG. The described steps compensate image data.

Continuing from the above-mentioned embodiment, as shown in FIG. 5 , the screen display method 500 first executes step S510, and the screen control unit 111 receives the brightness control signal CTL1 to control the backlight module control unit 140 to adjust the first brightness value to the second brightness value. In this embodiment, before the display device 100 is turned off, the picture control unit 111 is used to control the backlight module control unit 140 to generate a pulse width modulation signal (Pulse Width Modulation, PWM) according to the brightness control signal CTL1 to adjust the brightness of the backlight module 150 .

Based on the above, please refer to FIG. 6 . FIG. 6 is a timing diagram of powering off the display device according to an embodiment of the disclosure. As shown in FIG. 6, when the display device is turned off, the backlight module 150 will be turned off first, so the backlight control signal VEN will be switched from the enabling level (level) to the disabling level first. After the enable level, the pulse width modulation signal VPWM is switched from the enable level to the disable level after the time period TP1. After the pulse width modulation signal VPWM is switched to the disabled level, the data voltage VDATA is switched from the enabled level to the disabled level after the time period TP2. After the data voltage VDATA is switched to the disabled level, the power signal VIN of the display device is switched from the enabled level to the disabled level after the last time period TP3. In this embodiment, the picture control unit 111 controls the backlight module control unit 140 to switch the backlight control signal VEN from the enable level to the disable level according to the brightness control signal CTL1.

Next, the screen display method 500 executes step S520, the screen control unit 111 judges whether the first brightness value is greater than the threshold value, and in step S530, if the first brightness value is greater than the threshold value, the signal delay unit 113 is used to transmit the backlight control signal VEN The frame buffer 114 is delayed for a specific time period TPS, and the frame buffer 114 is used to provide the image data Vdata to the source driver 120 according to the control signal CTL2 sent by the frame control unit 111 . In this embodiment, the specific time period TPS is the time required to display 1-2 frames, and the threshold value is set to 50 nits.

Based on the above, in detail, when the first luminance value is greater than the threshold value (50nits), the signal delay unit 113 is used to delay the backlight control signal VEN to display 1-2 frames of pictures, and during the delayed time, the frame The buffer 114 transmits the image data Vdata to the source driver 120 . The image data Vdata may be image data with specific grayscale values or image data with specific frames. For example, when the display device 100 is turned off, the turn-off time of the backlight module 150 can be delayed to display 1-2 frames of pictures. The image or the image with a specific meeting makes it difficult for the red light generated when the display device 100 is turned off to pass through the liquid crystal.

Please refer to Fig. 1 and Fig. 7 to Fig. 9 together. 7 is a schematic diagram of a timing controller 110 according to an embodiment of the disclosure, FIG. 8 is a schematic diagram of a source driver 120 according to an embodiment of the disclosure, and FIG. 9 is a screen display according to an embodiment of the disclosure Flowchart of method 900 . In another embodiment, the timing controller 110 includes a picture control unit 111 and a signal delay unit 113 , and the picture control unit 111 is electrically coupled to the signal delay unit 113 . The source driver includes a frame buffer 121 and a processor 122, wherein the frame buffer 121 is used to store image data, and the processor 122 includes circuits such as shift registers, data registers, and potential shifters. No longer. In this embodiment, the screen display method 900 shown in FIG. 9 can be applied to the display device 100 shown in FIG. 1 , the timing controller 110 shown in FIG. 7 , and the source driver 120 shown in FIG. 9 . The timing control The device 110 and the source driver 120 are used to compensate the image data according to the steps described in the following frame display method 900 .

Continuing from the above embodiment, as shown in FIG. 9 , the screen display method 900 first executes step S910, the screen control unit 111 receives the brightness control signal CTL1 to control the backlight module control unit 140 to adjust the first brightness value to the second brightness value. In this embodiment, before the display device 100 is turned off, the picture control unit 111 is used to control the backlight module control unit 140 to generate a pulse width modulation signal (Pulse Width Modulation, PWM) according to the brightness control signal CTL1 to adjust the brightness of the backlight module 150 .

Next, the screen display method 900 executes step S920, in which the screen control unit 111 judges whether the first brightness value is greater than the threshold value, and in step S930, if the first brightness value is greater than the threshold value, the signal delay unit 113 is used to transmit the backlight control signal VEN Delay for a certain period TPS and transmit the backlight control signal VEN to the source driver 120 . In this embodiment, the specific time period TPS is the time required to display 1-2 frames, and the threshold value is set to 50 nits.

Next, the frame display method 900 executes step S940 , the frame buffer 121 of the source driver 120 is used to provide the image data Vdata to the pixel circuit 160 according to the backlight control signal VEN sent by the timing controller 110 . In detail, when the first brightness value is greater than the threshold value (50 nits), the signal delay unit 113 is configured to delay the backlight control signal VEN for displaying 1-2 frames of images. Then, during the delay time, the source driver 120 is used to receive the backlight control signal VEN, and the frame buffer 121 transmits the image data Vdata to the pixel circuit 160 according to the backlight control signal VEN. The image data Vdata may be image data with specific grayscale values or image data with specific frames. For example, when the display device 100 is turned off, the turn-off time of the backlight module 150 can be delayed to display 1-2 frames of images, and during the delayed time, the source driver 120 can provide additional From the display screen to the pixel circuit, images with lower grayscale values or images with specific meeting points can be displayed, so that the red light generated when the display device 100 is turned off does not easily pass through the liquid crystal.

In summary, the timing controller, display device, and screen display method of the present invention can adjust the grayscale value of the red sub-pixel or insert image data of a specific grayscale value through the execution of the timing controller or the source driver. Or the image data with a specific picture can reduce the influence of the red light caused by the residual red phosphor, and achieve the technical effect of preventing the display panel from having the problem of red light before adjusting the brightness or closing it.

Certain terms are used in the description and claims to refer to particular elements. However, those skilled in the art should understand that the same element may be called by different terms. The specification and claims do not use the difference in name as the way to distinguish components, but the difference in function of the components as the basis for distinction. The "comprising" mentioned in the specification and claims is an open term, so it should be interpreted as "including but not limited to". In addition, "coupled" herein includes any direct and indirect connection means. Therefore, if it is described that the first element is coupled to the second element, it means that the first element can be directly connected to the second element through electrical connection or signal connection means such as wireless transmission or optical transmission, or through other elements or connections. The means are indirectly electrically or signally connected to the second element.

In addition, unless otherwise specified in the specification, any singular term also includes a plural meaning.

The above are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.

Claims (24)

1. A screen display method, comprising: A timing controller receives a brightness control signal to control a backlight module control unit to adjust a first brightness value to a second brightness value; judging by the timing controller whether a difference between the second luminance value and the first luminance value is greater than a threshold; and If the difference value is greater than the threshold value, the timing controller is used to perform image data compensation after a certain period of time, and transmit the compensated image data to a source driver. 2. The image display method as claimed in claim 1, wherein the image data compensation is used to modify a first image data to a second image data, and transmit the second image data to the source driver. 3. The image display method as claimed in claim 2, wherein the timing controller is used to modify the first image data to the second image data after the specific period of time according to an image data comparison table. 4. The image display method according to claim 3, wherein the first image data includes a first red image data, a first green image data and a first blue image data, and the timing controller is used to The image data comparison table adjusts the first red image data to a second red image data, and combines the second red image data, the first green image data and the first blue image data into the second image data . 5. The image display method according to claim 1, wherein the specific time period is the time required to display 5-10 frames of images. 6. The image display method as claimed in claim 2, wherein the timing controller is used to perform the image data compensation within the time required for displaying 3-5 frames of images. 7. A screen display method, comprising: A timing controller receives a brightness control signal to control the backlight module control unit to adjust a first brightness value to a second brightness value; judging by the timing controller whether the first brightness value is greater than a threshold; and If the first brightness value is greater than the threshold value, the timing controller is used to delay a backlight control signal for a specific period of time. 8. The picture display method as claimed in claim 7, further comprising: If the first luminance value is greater than the threshold value, the timing controller is further used to provide an image data to a source driver. 9. The picture display method according to claim 7, further comprising: if the first brightness value is greater than the threshold value, the timing controller is further used to send a control signal to a source driver; and An image data is provided to a pixel circuit by the source driver. 10. The image display method according to claim 8 or 9, wherein the image data includes image data with a specific gray scale value or image data with a specific frame. 11. The picture display method as claimed in claim 7, wherein, if the first brightness value is greater than the threshold value, the timing controller is used to switch the backlight control signal from an enable level to a disable level after the specific period of time Can align. 12. The image display method according to claim 7, wherein the specific time period is the time required to display 1-2 frames of images. 13. A timing controller, comprising: A picture control unit receives a brightness control signal, and controls a backlight module control unit to adjust a first brightness value to a second brightness value, and then judges whether a difference between the second brightness value and the first brightness value is greater than a threshold; and A picture compensation unit, electrically connected with the picture control unit, if the difference value is greater than the threshold value, the picture compensation unit is used to perform an image data compensation after a specific period of time, and transmit the compensated image data to a source driver. 14. The timing controller as claimed in claim 13, wherein the image data compensation is used to modify a first image data to a second image data, and transmit the second image data to the source driver. 15. The timing controller as claimed in claim 14, wherein the frame compensation unit is configured to modify the first image data to the second image data after the specific period of time according to an image data comparison table. 16. The timing controller according to claim 15, wherein the first image data comprises a first red image data, a first green image data and a first blue image data, and the frame compensation unit is used for The image data comparison table adjusts the first red image data to a second red image data, and combines the second red image data, the first green image data and the first blue image data into the second image data. 17. The timing controller according to claim 13, wherein the specific time period is the time required to display 5-10 frames of images. 18. The timing controller as claimed in claim 14, wherein the timing controller is used to perform the image data compensation within the time required for displaying 3-5 frames of images. 19. A display device comprising: a source driver; a backlight module; a backlight module control unit, electrically connected to the backlight module, for controlling the backlight module; and a timing controller, electrically connected with the source driver and the backlight module control unit, for receiving a brightness control signal, and controlling the backlight module control unit to adjust a first brightness value to a second brightness value, the The timing controller includes: a picture control unit, used to determine whether the first brightness value is greater than a threshold value; and A signal delay unit is electrically connected with the picture control unit. If the first brightness value is greater than the threshold value, the signal delay unit is used for delaying a backlight control signal for a specific period of time. 20. The display device as claimed in claim 19, wherein the timing controller further comprises: A frame buffer is used to store an image data, and provide the image data to the source driver according to a control signal sent by the picture control unit. 21. The display device according to claim 19, wherein the source driver further comprises: A frame buffer is used to store an image data, and provide the image data to a pixel circuit according to a control signal sent by the timing controller. 22. The display device according to claim 20 or 21, wherein the image data includes image data with a specific gray scale value or image data with a specific frame. 23. The display device as claimed in claim 19, wherein, if the first luminance value is greater than the threshold value, the timing controller is used to switch the backlight control signal from an enable level to a disable level after the specific period of time quasi-position. 24. The display device according to claim 19, wherein the specific time period is the time required to display 1-2 frames of pictures.