Display device and backlight control method thereof
By increasing the number of serial interfaces of the timing control unit and dividing the backlight area, the problem of long delay in backlight control of existing display devices is solved, and lower delay time and higher display quality are achieved, which is suitable for high-standard applications.
Patent Information
- Application Number
- CN202411914451.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2024-12-05
- Filing Date
- 2024-12-24
- Publication Date
- 2025-02-18
AI Technical Summary
When performing backlight control, the existing display devices have a long delay, resulting in a long hardware delay, which takes a long time from signal generation to display, and cannot meet the requirements of high standards, such as surgical procedures.
By increasing the number of serial interfaces of the timing control unit and dividing the backlight area of the backlight module along the scanning direction of the scanning line of the display panel, simultaneous control of the first backlight area and the second backlight area is achieved, and driving each backlight is shortened. Area time.
The delay time of the backlight control corresponding to each image frame is reduced, the reaction time and display quality of the display device are improved, and it is suitable for application fields with high real-time and low latency.
Smart Images
Figure CN119479563A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a display device and a backlight control method thereof. Background Art
[0002] The technological development of light emitting diodes (LEDs), from the initial solid-state lighting to the backlight source in the display field and then to LED display devices, has provided a solid foundation for its wide application. Among them, with the development of chip manufacturing and packaging technology, the backlight source using sub-millimeter light emitting diodes (mini-LED) and even micron light emitting diodes (micro LED) has also developed rapidly, thus enabling the backlight source to achieve more detailed local dimming display.
[0003] See also Figure 1 As shown, the conventional display 10 includes a display panel 110, a backlight module 120 and a timing controller 130. The display panel 110 is arranged opposite to the backlight module 120. In order to perform zone dimming, the backlight module 120 has a plurality of parallel backlight areas, and the backlight areas A01 to A06 are taken as an example. In addition, the backlight module 120 also has a first backlight driving board 121 and a second backlight driving board 122 to receive the backlight driving signal from the timing controller 130, and then drive the light-emitting diodes corresponding to the backlight areas A01 to A06. Further explanation, the first backlight driving board 121 has three driving chips 121A to 121C, and the second backlight driving board 122 also has three driving chips 122A to 122C. Among them, the driving chip 121A drives the backlight area A01 to emit light, and so on. In addition, the driving chip 122A drives the backlight area A04 to emit light, and so on.
[0004] The driving method of the light-emitting units corresponding to the backlight areas A01~A06 is serial driving, and the timing controller 130 outputs the backlight driving signal D01 to the driving chip 121A of the first backlight driving board 121 to drive the light-emitting diode corresponding to the backlight area A01, and then the driving signal D01 is transmitted to the driving chip 121B and the driving chip 121C in sequence, and then the driving signal D01 is transmitted back to the timing controller 130 and then transmitted in sequence to the driving chip 122A, the driving chip 122B and the driving chip 122C of the second backlight driving board 122.
[0005] In the above-mentioned traditional backlight driving method combined with the liquid crystal driving method, the backlight control for displaying an image frame must be transmitted sequentially from the first light-emitting diode to the last light-emitting diode in a complete image frame time (frame time) before it can be fully lit. In other words, the existing method is based on a complete frame, and the calculation time for each frame is about 40 milliseconds. Therefore, since the light-emitting diodes need to be transmitted one by one, the hardware delay is relatively long, and it takes a long time from signal generation to display. Due to the long delay, the instant response speed of the system cannot meet some high-standard applications, such as surgical operations. Therefore, providing a display device and a backlight control method thereof to effectively solve the above problems is one of the current important topics. Summary of the invention
[0006] The present invention provides a display device and a backlight control method thereof to improve the delay of the display device during display, and further enhance the response time and display quality of the displayed image.
[0007] To achieve the above-mentioned purpose, the present invention provides a backlight control method for a display device. The display device has a display panel, a backlight module and a timing control unit. The display panel has a plurality of scan lines, and the backlight module has a plurality of light-emitting units, and these light-emitting units are divided into a first backlight area and a second backlight area along a scan direction of the scan lines. The backlight control method includes the following steps: acquiring backlight brightness data by the timing control unit; outputting a first backlight area control signal by the timing control unit to the backlight driving unit to control the brightness of the first backlight area; and outputting a second backlight area control signal by the timing control unit to the backlight driving unit to control the brightness of the second backlight area.
[0008] In one embodiment of the present invention, the first backlight area control signal is transmitted to the backlight driving unit via a first serial interface, and the second backlight area control signal is transmitted to the backlight driving unit via a second serial interface.
[0009] In an embodiment of the present invention, the first backlight area control signal and the second backlight area control signal are outputted via the first serial interface and the second serial interface simultaneously.
[0010] In one embodiment of the present invention, the first backlight area control signal and the second backlight area control signal are outputted simultaneously through the first serial interface and the second serial interface via a synchronization signal, a multi-thread or a hardware interrupt source.
[0011] In one embodiment of the present invention, in the first backlight area or the second backlight area, the corresponding light emitting units are driven in a row-by-row scanning manner.
[0012] In an embodiment of the present invention, the light emitting unit is driven to scan row by row from top to bottom or to scan row by row from bottom to top.
[0013] On the other hand, in order to achieve the above-mentioned purpose, the present invention provides a display device, which includes a display module, a backlight module and a driving module. The display module has a display panel, and the display panel has a plurality of scan lines. The backlight module is arranged opposite to the display module and has a plurality of light-emitting units, wherein these light-emitting units are divided into a first backlight area and a second backlight area along a scanning direction of these scan lines. The driving module is electrically connected to the display module and the backlight module respectively and has a timing control unit. The timing control unit outputs a first backlight area control signal through a first serial interface to control the brightness of the first backlight area, and outputs a second backlight area control signal through a second serial interface to control the brightness of the second backlight area.
[0014] In one embodiment of the present invention, the driving module further comprises a driving unit electrically connected to the timing control unit. The driving unit comprises a first backlight driving unit and a second backlight driving unit. The first backlight driving unit is electrically connected between the first serial interface and the first backlight area to transmit the first backlight area control signal. The second backlight driving unit is electrically connected between the second serial interface and the second backlight area to transmit the second backlight area control signal.
[0015] As mentioned above, the display device and backlight control method of the present invention increase the number of serial interfaces of the timing control unit and divide the backlight area of the backlight module along the scanning direction of the scanning line of the display panel. By shortening the time of driving each backlight area, the delay time of the backlight control corresponding to each image frame can be reduced in conjunction with the actuation of the display panel.
[0016] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 A schematic diagram of the architecture of an existing display;
[0018] Figure 2 A schematic diagram of the structure of a display device according to a preferred embodiment of the present invention;
[0019] Figure 3 is a schematic diagram of a display module according to a preferred embodiment of the present invention;
[0020] Figure 4A flowchart of a backlight control method according to a preferred embodiment of the present invention; and
[0021] Figure 5 FIG. 4 is a schematic diagram of another display device according to the present invention. DETAILED DESCRIPTION
[0022] See also Figure 2 As shown, the display device 20 of the preferred embodiment of the present invention comprises a display module 21, a backlight module 22 and a driving module 23. The driving module 23 is electrically connected to and drives the display module 21 and the backlight module 22 respectively.
[0023] like Figure 3 As shown, the display module 21 has a display panel 211, a data driving circuit 212 and a scan driving circuit 213. The data driving circuit 212 is electrically connected to the display panel 211 through a plurality of data lines D11-D1n, and the scan driving circuit 213 is electrically connected to the display panel 211 through a plurality of scan lines S11-S1m. The display panel 211 of this embodiment is a liquid crystal display panel. The display module 21 writes a signal corresponding to each pixel into a corresponding liquid crystal driving element through the scan driving circuit 213 and the data driving circuit 212 according to an image frame data.
[0024] Please also see Figure 2 and Figure 3 As shown, the backlight module 22 can emit light to pass through the display panel 211 of the display module 21, so that the display panel 211 can display an image. Among them, the backlight module 22 may include a plurality of light-emitting units 221 arranged in an array, such as but not limited to light-emitting diodes (LEDs), organic light-emitting diodes (OLEDs), sub-millimeter light-emitting diodes (Mini-LEDs) or micro-light-emitting diodes (Micro-LEDs). This embodiment takes sub-millimeter light-emitting diodes as an example. The so-called array arrangement refers to the arrangement and combination of the light-emitting units 221 in rows and columns, which is not limited to aligned arrangements or staggered arrangements. In addition, the light-emitting units 221 arranged in an array are divided into multiple groups, and each group constitutes a backlight area. This embodiment takes the division of the light-emitting units 221 into a first backlight area A21 and a second backlight area A22 as an example.
[0025] The driving module 23 includes a timing control unit 231 and a driving unit 232. The timing control unit 231 includes a first serial peripheral interface (SPI) 231A and a second serial interface 231B. The driving unit 232 includes a first backlight driving unit 232A and a second backlight driving unit 232B corresponding to the first backlight area A21 and the second backlight area A22, respectively. The first backlight driving unit 232A is electrically connected to the first serial interface 231A and the light-emitting unit 221 of the first backlight area A21, respectively, and the second backlight driving unit 232B is electrically connected to the second serial interface 231B and the light-emitting unit 221 of the second backlight area A22, respectively.
[0026] In an exemplary embodiment, the backlight module 22 performs a zone dimming procedure according to the gamma value (e.g., Gamma 2.2) of the display device 20. The zone dimming procedure includes the backlight module 22 independently adjusting the luminous brightness of each light-emitting unit 221 according to the brightness of each part of the display screen. In this way, the brightness of the corresponding light-emitting unit 221 can be reduced when displaying a dark image to increase the depth of black, and the brightness of the corresponding light-emitting unit 221 can be increased when displaying a bright image to enhance the brightness of the image. The above-mentioned zone dimming procedure can apply AmLED technology, using an active matrix drive circuit to control the opening and closing of each sub-millimeter light-emitting diode, or to perform precise brightness control on each area. In other words, when executing the zone dimming procedure to compensate for gamma, the gamma value is maintained at 2.2 by adjusting the backlight brightness under different display areas.
[0027] See also Figure 2 and Figure 4 As shown, a backlight control method of a display device according to a preferred embodiment of the present invention is described. The backlight control method of the display device 20 includes steps S01 to S04.
[0028] Step S01 provides a backlight module 22 and a driving module 23 that are electrically connected to each other. The corresponding connection relationship between the backlight module 22, the driving module 23 and the display module 21 is as described above. It is worth mentioning that the division of the backlight area in the backlight module 22 is associated with the scanning direction of the display panel 211. In other words, the scanning driving circuit 213 of the display module 21 is electrically connected to the display panel 211 through the scanning lines S11~S1m, and the backlight area is divided along the setting direction of the scanning lines S11~S1m. For example, if the scanning lines are set in the horizontal direction, the first backlight area A21 and the second backlight area A22 are also divided in the horizontal direction.
[0029] In step S02 , the timing control unit 231 of the driving module 23 obtains backlight brightness data, wherein the backlight brightness data includes the brightness values of all the light-emitting units 221 , and may also include the driving signal size required by each light-emitting unit 221 .
[0030] In step S03, the timing control unit 231 outputs the first backlight area control signal to the first backlight driving unit 232A through the first serial interface 231A to control the brightness of the first backlight area A21. In this embodiment, the first backlight area control signal is along the direction of the scan line, and the first light emitting unit 221 of the first row of the first backlight area A21 is driven row by row to give the corresponding driving signal.
[0031] In step S04, the timing control unit 231 outputs the second backlight area control signal to the second backlight driving unit 232B through the second serial interface 231B to control the brightness of the second backlight area A22. In this embodiment, the second backlight area control signal is along the direction of the scan line, and the first light emitting unit 221 of the first row of the second backlight area A22 is driven row by row to give the corresponding driving signal.
[0032] It is worth mentioning that the above steps S03 and S04 can be executed simultaneously. In other words, the first backlight area control signal and the second backlight area control signal can be output to the first backlight area A21 and the second backlight area A22 respectively in substantial synchronization. Therefore, the time for controlling each backlight area can be reduced, thereby reducing the delay time, and thus being applicable to application fields that particularly require high-speed response time, such as the medical field, especially endoscopic surgery that requires high real-time performance and low latency. It should be noted that the above-mentioned substantial synchronization concept includes the situation where asynchronous output is caused by signal transmission delay.
[0033] On the other hand, the simultaneous execution of step S03 and step S04 can be achieved by, for example, but not limited to, a synchronization signal, a multi-thread or a hardware interrupt. Among them, the synchronization signal method can be achieved by the timing control unit 231 generating a synchronization signal and sending it to the first serial interface 231A and the second serial interface 231B to ensure that the backlight brightness adjustment of the two areas starts at the same time. Furthermore, the multi-thread method can start two independent threads through a multi-core processor or the timing control unit 231, which are responsible for driving the first backlight area A21 and the second backlight area A22 respectively, to ensure that the backlight brightness adjustment of the two areas starts at the same time. Finally, the hardware interrupt method can, for example, set a hardware interrupt source, and when an interrupt occurs, the driving of the first backlight area A21 and the second backlight area A22 is triggered at the same time to ensure that the backlight brightness adjustment of the two areas starts at the same time. Among them, the so-called hardware interrupt source is, for example, but not limited to, triggering an interrupt signal through a timer.
[0034] In an exemplary embodiment, a backlight area may be formed by a row of light-emitting units, and the number of serial interfaces may directly correspond to the number of rows of light-emitting units. That is, one serial interface corresponds to a light-emitting unit arranged in a single row. Figure 5 As shown, the timing control unit 331 has n serial interfaces 3311-331n, the driving unit 332 has n backlight driving units 3321-332n, and the backlight module 32 has n backlight areas A31-A3n. Each backlight driving unit 3321-332n is electrically connected to the corresponding serial interface 3311-331n and the backlight area A31-A3n respectively. Therefore, the display device can significantly reduce the delay time, but the corresponding method and number are only exemplary. The present invention aims to increase the number of serial interfaces that can simultaneously control the backlight area and match the scanning direction of the backlight area with the scanning line.
[0035] Through the above description, the display device and backlight compensation method of the present invention can effectively compensate brightness at different window opening rates and grayscale levels to enhance regional contrast, reduce halo effect, and maintain a stable gamma value and high brightness of the display device, thereby improving display quality.
[0036] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A backlight control method for a display device, wherein the display device comprises a display panel, a backlight module and a timing control unit, wherein the display panel comprises a plurality of scanning lines, the backlight module comprises a plurality of light-emitting units, and the plurality of light-emitting units are divided into a first backlight area and a second backlight area along a scanning direction of the scanning lines, wherein: include: The timing control unit obtains backlight brightness data; The timing control unit outputs a first backlight area control signal to a backlight driving unit to control the brightness of the first backlight area; as well as The timing control unit outputs a second backlight area control signal to the backlight driving unit to control the brightness of the second backlight area.
2. The backlight control method according to claim 1, characterized in that: The first backlight area control signal is transmitted to the backlight driving unit via a first serial interface, and the second backlight area control signal is transmitted to the backlight driving unit via a second serial interface.
3. The backlight control method according to claim 2, characterized in that: The first backlight area control signal and the second backlight area control signal are simultaneously outputted via the first serial interface and the second serial interface.
4. The backlight control method according to claim 3, characterized in that: The first backlight area control signal and the second backlight area control signal are outputted simultaneously through the first serial interface and the second serial interface via a synchronization signal, a multi-thread or a hardware interrupt source.
5. The backlight control method according to claim 1, wherein: In the first backlight area or the second backlight area, the corresponding plurality of light-emitting units are driven in a row-by-row scanning manner.
6. The backlight control method according to claim 5, characterized in that: The plurality of light emitting units are driven to scan row by row from top to bottom or to scan row by row from bottom to top.
7. A display device, characterized in that: include: A display module having a display panel, wherein the display panel has a plurality of scan lines; a backlight module, arranged opposite to the display module, having a plurality of light-emitting units, wherein the plurality of light-emitting units are divided into a first backlight area and a second backlight area along a scanning direction of the scanning lines; as well as A driving module is electrically connected to the display module and the backlight module respectively, and has a timing control unit, which outputs a first backlight area control signal through a first serial interface to control the brightness of the first backlight area, and outputs a second backlight area control signal through a second serial interface to control the brightness of the second backlight area.
8. The display device according to claim 7, characterized in that: The driving module further comprises a driving unit electrically connected to the timing control unit, including: a first backlight driving unit, electrically connected between the first serial interface and the first backlight area; and a second backlight driving unit, electrically connected between the second serial interface and the second backlight area, The first backlight area control signal is transmitted to the backlight driving unit via the first serial interface, and the second backlight area control signal is transmitted to the backlight driving unit via the second serial interface.
9. The display device according to claim 7, wherein: The first backlight area control signal and the second backlight area control signal are simultaneously outputted via the first serial interface and the second serial interface.
10. The display device according to claim 9, characterized in that The first backlight area control signal and the second backlight area control signal are outputted simultaneously through the first serial interface and the second serial interface via a synchronization signal, a multi-thread or a hardware interrupt source.