Brightness adjusting method, backlight driving chip and backlight module

Abstract

The invention provides a brightness adjusting method, backlight driving chips and a backlight module, each backlight driving chip is electrically connected with LEDs of N (a positive integer greater than 1) colors, each driving channel is provided with at least one LED, and the backlight driving chips control the brightness of the LEDs in each driving channel based on target brightness data corresponding to the backlight driving chips, the backlight controller monitors the channel voltage in each driving channel and the color of the LED and generates monitoring data based on the monitored channel voltage in each driving channel and the color of the LED, and for each color, the backlight controller adjusts the current input voltage of the LED of the color to the target input voltage based on the received monitoring data. Due to the fact that the backlight driving chip is electrically connected with the LEDs of the N colors, the backlight driving chip generates the monitoring data based on the monitored channel voltage of each driving channel and the color of each LED, the backlight controller can adjust the input voltage of the LEDs of the different colors based on the received monitoring data, wiring can be simplified, and cost can be reduced.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a brightness adjustment method, a backlight driver chip, and a backlight module. Background Art

[0002] Mini LED backlight technology has been widely adopted in the display industry. Through high-density Mini LED arrays and zoned dimming technology, it significantly improves the color performance, contrast, and brightness uniformity of display devices. The small size of Mini LEDs enables the integration of thousands to tens of thousands of LEDs into a single screen. Combined with independent control of red, green, and blue (RGB), this technology achieves wide color gamut coverage and precise color reproduction, meeting the demands of HD and UHD displays.

[0003] In the existing technology, in the backlight module using Mini LED RGB backlight technology, each backlight driver chip is connected to Mini LEDs of one color. For example, backlight driver chip 1 is electrically connected to three red Mini LEDs, backlight driver chip 2 is electrically connected to three green Mini LEDs, and backlight driver chip 3 is electrically connected to three blue Mini LEDs. In order to ensure that the transmitted data is information about Mini LEDs of the same color, the Mini LEDs corresponding to each column of backlight driver chips in the backlight unit have the same color.

[0004] A backlight driver chip can only control the brightness of Mini LED of one color, which will cause complex wiring and high cost of the backlight unit. If a backlight driver chip is electrically connected to Mini LEDs of multiple colors, how the backlight driver chip controls the brightness of Mini LEDs of multiple colors is a problem that needs to be solved urgently by technical personnel in this field. Summary of the Invention

[0005] The present application provides a brightness adjustment method, a backlight driver chip, and a backlight module to solve the problems of complex backlight unit wiring and high cost in display devices using Mini LED RGB backlight technology in the prior art.

[0006] In a first aspect, the present application provides a brightness adjustment method applied to a backlight module, wherein the backlight module includes a backlight controller and multiple backlight driver chips, each backlight driver chip is electrically connected to LEDs of N colors, and each backlight driver chip includes M drive channels, each drive channel is provided with at least one LED, N is a positive integer greater than 1, and M is greater than or equal to N. The method includes:

[0007] After receiving the display data, the backlight driver chip controls the brightness of the LED in each driving channel according to the target brightness data corresponding to the backlight driver chip in the display data;

[0008] The backlight driver chip monitors the channel voltage of each driving channel, generates monitoring data based on the monitored channel voltage and the color of the LED in each driving channel, and sends the monitoring data to the backlight controller. After receiving the monitoring data, the backlight controller adjusts the current input voltage of the LED of each color to the target input voltage based on the monitoring data.

[0009] In one possible implementation, generating monitoring data based on the monitored voltage of each channel and the color of the LED in each driving channel includes:

[0010] For each driving channel, the backlight driving chip determines a color identifier corresponding to the color of the LED in the driving channel, and uses the color identifier and the channel voltage of the driving channel as a set of sub-monitoring data;

[0011] The backlight driving chip uses each group of sub-monitoring data as the monitoring data;

[0012] The step of adjusting, for each color LED, a current input voltage of the color LED to a target input voltage based on the monitoring data includes:

[0013] For each color of LED, the backlight controller determines a plurality of channel voltages corresponding to the color identifier of the color from the monitoring data;

[0014] When the backlight controller determines that among the multiple channel voltages, there is a channel voltage that is less than the first threshold, the current input voltage of the LED corresponding to the color identification is increased; when it determines that among the multiple channel voltages, all channel voltages are greater than or equal to the first threshold, and there is a channel voltage that is greater than or equal to the second threshold, the current input voltage of the LED corresponding to the color identification is decreased, wherein the second threshold is greater than the first threshold.

[0015] In one possible implementation, generating monitoring data based on the monitored voltage of each channel and the color of the LED in each driving channel includes:

[0016] The backlight driver chip determines the color of the LED in each drive channel;

[0017] For each color of LED, the backlight driver chip determines a voltage state corresponding to the color of LED based on a channel voltage of a target drive channel, wherein the target drive channel includes the color of LED;

[0018] The backlight driver chip uses the color identifier of the color and the voltage state corresponding to the LED of the color as a set of sub-monitoring data;

[0019] The backlight driving chip uses each group of sub-monitoring data as the monitoring data;

[0020] The step of adjusting, for each color LED, a current input voltage of the color LED to a target input voltage based on the monitoring data includes:

[0021] For each color of LED, the backlight controller determines, from the monitoring data, a plurality of voltage states corresponding to the color identifier of the color;

[0022] If the backlight controller determines that there is a low voltage state among the multiple voltage states, it will increase the current voltage of the LED of the color; if it determines that there is no low voltage state among the multiple voltage states and there is a high voltage state, it will decrease the current voltage of the LED of the color.

[0023] In a possible implementation, for each color LED, the backlight driver chip determines the voltage state corresponding to the color LED based on the channel voltage of the target drive channel, including:

[0024] Among the channel voltages of the target driving channels, the backlight driving chip determines that there is a channel voltage less than a first threshold, and then determines that the voltage state corresponding to the LED of the color is a low voltage state; among the channel voltages of the target driving channels, the backlight driving chip determines that all channel voltages are greater than or equal to the first threshold, and there is a channel voltage greater than or equal to a second threshold, and then determines that the voltage state corresponding to the LED of the color is a high voltage state, wherein the first threshold is less than the second threshold.

[0025] In a possible implementation, after controlling the brightness of the LED in each driving channel, the method further includes:

[0026] Determining relevant working data of the backlight driver chip, placing the relevant working data in the monitoring data, and after the backlight controller receives the monitoring data, performing corresponding operations based on the relevant working data in the monitoring data;

[0027] Among them, the relevant working data includes part or all of the following: open circuit state data of each LED in each driving channel of the backlight driver chip, short circuit state data of each LED in each driving channel of the backlight driver chip, fault state data of the backlight driver chip, temperature data of the backlight driver chip, and input and output circuit breaker data of the backlight driver chip.

[0028] In a possible implementation, the method further includes:

[0029] The address data corresponding to the backlight driver chip is placed in the monitoring data. After receiving the monitoring data, the backlight controller determines the target backlight driver chip based on the address data in the monitoring data, and performs corresponding operations on the target backlight driver chip based on the relevant working data in the monitoring data.

[0030] In a possible implementation, after the backlight driver chip receives the display data, the backlight driver chip further includes:

[0031] The backlight driver chip determines a target function instruction signal corresponding to the backlight driver chip from the display data;

[0032] Before the backlight driver chip monitors the channel voltage of each driving channel of the backlight driver chip, the method further includes:

[0033] The backlight driver chip monitors the channel voltage of each driving channel of the backlight driver chip based on the target function instruction signal.

[0034] In a second aspect, the present application further provides a backlight driver chip, which is applied to a backlight module. The backlight module includes a backlight controller and a plurality of backlight driver chips. The backlight driver chip includes:

[0035] Input terminal, used to input display data or output monitoring data;

[0036] An output terminal, used for outputting the display data or inputting the monitoring data;

[0037] An input / output module, configured to send the display data inputted from the input end to the logic module and the output end, or to send the monitoring data to the input end;

[0038] The logic module is configured to receive the display data and determine target brightness data corresponding to the backlight driver chip from the display data;

[0039] a driving module, configured to electrically connect to a plurality of LEDs via M driving channels and control the brightness of the plurality of LEDs based on the target brightness data, wherein the plurality of LEDs include LEDs of N colors, N being a positive integer greater than 1, and M being greater than or equal to N; monitor a channel voltage of each driving channel; and transmit the monitored channel voltage to a feedback function module;

[0040] The feedback function module is used to generate the monitoring data based on the monitored voltage of each channel and the color of the LED in each driving channel; and send the monitoring data to the input and output module;

[0041] After receiving the monitoring data, the backlight controller adjusts the current input voltage of each color LED to the target input voltage based on the monitoring data.

[0042] In a possible implementation, the feedback function module is specifically configured to:

[0043] For each driving channel, determining a color identifier corresponding to the color of the LED in the driving channel, using the color identifier and the driving voltage of the driving channel as a set of sub-monitoring data; and using each sub-monitoring data as the monitoring data;

[0044] For each color of LED, the backlight controller determines multiple channel voltages corresponding to the color identification of the color from the monitoring data. When determining that among the multiple channel voltages, there is a channel voltage less than a first threshold, the current input voltage of the LED corresponding to the color identification is increased. When determining that among the multiple channel voltages, all channel voltages are greater than or equal to the first threshold, and there is a channel voltage greater than or equal to the second threshold, the current input voltage of the LED corresponding to the color identification is decreased, wherein the second threshold is greater than the first threshold.

[0045] In a possible implementation, the feedback function module is specifically configured to:

[0046] Determining the color of an LED in each driving channel; for each color LED, determining a voltage state corresponding to the color LED based on a channel voltage of a target driving channel, wherein the target driving channel includes the color LED; using the color identifier of the color and the voltage state corresponding to the color LED as a set of sub-monitoring data; and using each set of sub-monitoring data as the monitoring data;

[0047] For each color of LED, the backlight controller determines multiple voltage states corresponding to the color identification of the color from the monitoring data; if it is determined that a low voltage state exists among the multiple voltage states, the current voltage of the LED of the color is increased; if it is determined that a high voltage state exists and no low voltage state exists among the multiple voltage states, the current voltage of the LED of the color is decreased.

[0048] In a possible implementation, the feedback function module is specifically configured to:

[0049] Among the channel voltages of the target driving channel, if it is determined that there is a channel voltage less than a first threshold, then the voltage state corresponding to the LED of the color is determined to be a low voltage state; among the channel voltages of the target driving channel, if it is determined that all channel voltages are greater than or equal to the first threshold and there is a channel voltage greater than or equal to a second threshold, then the voltage state corresponding to the LED of the color is determined to be a high voltage state, wherein the first threshold is less than the second threshold.

[0050] In a possible implementation, the feedback function module is further configured to:

[0051] Determining relevant working data of the backlight driver chip, placing the relevant working data in the monitoring data, and after the backlight controller receives the monitoring data, performing corresponding operations based on the relevant working data in the monitoring data;

[0052] Among them, the relevant working data includes part or all of the following: open circuit state data of each LED in each driving channel of the backlight driver chip, short circuit state data of each LED in each driving channel of the backlight driver chip, fault state data of the backlight driver chip, temperature data of the backlight driver chip, and input and output circuit breaker data of the backlight driver chip.

[0053] In a possible implementation, the feedback function module is further configured to:

[0054] The address data corresponding to the backlight driver chip is placed in the monitoring data. After receiving the monitoring data, the backlight controller determines the target backlight driver chip based on the address data in the monitoring data, and performs corresponding operations on the target backlight driver chip based on the relevant working data in the monitoring data.

[0055] In a possible implementation, after receiving the display data, the logic module is further configured to:

[0056] Determining a target function instruction signal corresponding to the backlight driver chip from the display data;

[0057] The driving module is also used for:

[0058] Based on the target function instruction signal, a channel voltage of each LED connected to the backlight driving chip is monitored.

[0059] In a third aspect, the present application further provides a backlight module, comprising a backlight controller and a backlight driver chip as described in any one of the second aspects.

[0060] The beneficial effects of this application are as follows:

[0061] The present application provides a brightness adjustment method, a backlight driver chip, and a backlight module. The backlight module includes a backlight controller and multiple backlight driver chips. Each backlight driver chip is electrically connected to N colors of LEDs, and each backlight driver chip includes M drive channels, each drive channel is provided with at least one LED, N is a positive integer greater than 1, and M is greater than or equal to N. The backlight driver chip controls the brightness of the LED in each drive channel based on received display data and its corresponding target brightness data, and generates monitoring data based on the monitored channel voltage of each drive channel and the color of the LED in each drive channel. For each color of LED, the backlight controller adjusts the current input voltage of the LED of that color to the target input voltage based on the received monitoring data. Since the backlight driver chip is electrically connected to the N colors of LEDs, N is a positive integer greater than 1, and the backlight driver chip can generate monitoring data based on the monitored channel voltage of each drive channel and the color of the LED in each drive channel, the backlight controller can adjust the input voltage of the different colors of LEDs based on the received monitoring data, thereby simplifying the wiring of the backlight unit and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings introduced below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0063] Figure 1 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0064] Figure 2 A schematic diagram of the connection between a backlight controller and a backlight unit provided in the related art;

[0065] Figure 3 A partial structural diagram of a backlight unit provided in the related art;

[0066] Figure 4A A schematic diagram of a driving architecture of a backlight unit provided in an embodiment of the present application;

[0067] Figure 4B A schematic diagram of another driving architecture of a backlight unit provided in an embodiment of the present application;

[0068] Figure 4C A schematic diagram of another driving architecture of a backlight unit provided in an embodiment of the present application;

[0069] Figure 5 This is a schematic diagram of an application scenario of an embodiment of the present application;

[0070] Figure 6 A schematic diagram of a process for adjusting brightness according to an embodiment of the present application;

[0071] Figure 7 A schematic diagram of a structure for displaying data provided in an embodiment of the present application;

[0072] Figure 8 A schematic diagram of a partial structure of a backlight unit provided in an embodiment of the present application;

[0073] Figure 9 A schematic diagram of a portion of the structure of another backlight unit provided in an embodiment of the present application;

[0074] Figure 10 A schematic diagram of the structure of monitoring data provided in an embodiment of the present application;

[0075] Figure 11 A schematic diagram of another structure of monitoring data provided in an embodiment of the present application;

[0076] Figure 12 A schematic diagram of another structure of monitoring data provided in an embodiment of the present application;

[0077] Figure 13 A schematic structural diagram of a backlight driver chip provided in an embodiment of the present application;

[0078] Figure 14 A structural diagram of a feedback function module provided in an embodiment of the present application. DETAILED DESCRIPTION

[0079] To make the objectives, technical solutions, and advantages of this application more clear, this application will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0080] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0081] RGB backlight technology has achieved remarkable results. Mini LED RGB backlight technology holds a pivotal position in the display field. It significantly enhances color performance, precisely controlling the output of red, green, and blue light, achieving wide color gamut coverage and accurate color reproduction, resulting in vibrant, realistic, and detailed images. Zoned dimming technology allows for independent control of the brightness and color of each zone. When displaying black scenes, the corresponding backlight zone is turned off, significantly enhancing contrast and presenting rich light and dark details. Mini LEDs, due to their small size, can integrate more LEDs, improving pixel density and display accuracy, meeting the demands of HD and UHD displays. Parameters can also be flexibly adjusted according to different application scenarios, driving the overall development of display technology.

[0082] like Figure 1 As shown, it is a structural schematic diagram of a display device provided in an embodiment of the present application. The display device adopts Mini LED RGB backlight technology. The display device includes a main processor 11, a display module 12 and a backlight module 13. The main processor 11 can adopt a system-on-chip (SoC) or other electronic devices that can output pixel data. The main processor 11 is electrically connected to the display module 12 and the backlight module 13 respectively. The display module 12 includes a timing controller (TCON) and a display panel. The display panel includes a pixel array composed of liquid crystal molecules, and data lines and scan lines connected to the pixel array. The timing controller is electrically connected to the data lines and scan lines set on the display panel.

[0083] The backlight module 13 includes a backlight controller and a backlight unit. The backlight unit includes multiple backlight driver chips, multiple groups of light-emitting units, and a power module. Each light-emitting unit typically includes three light-emitting diodes, namely a red light-emitting diode (RLED), a green light-emitting diode (GLED), and a blue light-emitting diode (BLED). The LEDs can be Mini LEDs. The power module includes a red power module, a green power module, and a blue power module. The power modules are used to power the LEDs of corresponding colors. For example, the red power module provides a supply voltage for the RLED, the green power module provides a supply voltage for the GLED, and the blue power module provides a supply voltage for the BLED. The backlight controller is electrically connected to the power module and controls the supply voltage output by the power module. The supply voltage output by the power module is the input voltage for the LEDs.

[0084] The SoC and the backlight controller can communicate based on the serial peripheral interface (SPI) protocol, and the backlight controller and the backlight unit can communicate based on the single-wire transmission protocol or the SPI protocol. Specifically, the backlight controller receives the initial dimming data sent by the SoC or TCON through the SPI protocol, such as local dimming data (LD); after receiving the initial dimming data, the backlight controller processes it to generate target dimming data, which includes current setting data and PWM setting data, and sends it to the backlight unit based on the single-wire transmission protocol or the SPI protocol; the backlight unit is provided with multiple dimmers (Dimmers) and backlight sources connected to each dimmer. The dimmer usually adopts a backlight driver chip. After the dimmer on the backlight unit receives the target dimming data, it controls the brightness of the backlight source connected to it based on the target dimming data to provide backlight for the display panel.

[0085] It should be noted that the backlight source in the embodiment of the present application is Mini LED of different colors.

[0086] like Figure 2 FIG. 1 is a schematic diagram showing a connection between a backlight controller and a backlight unit provided in the related art. Figure 2 In the embodiment, the backlight unit 200 includes a plurality of backlight driver chips 210 and a plurality of backlight source groups 220, wherein one backlight source group 220 includes a plurality of backlight sources 2201, and one backlight driver chip is electrically connected to at least one backlight source 2201 ( Figure 2 2. In the figure, a backlight driver chip 210 is electrically connected to two backlight sources 2201 as an example).

[0087] The multiple backlight driver chips in the backlight unit 200 are arranged in an array. Each column of backlight driver chips 210 is electrically connected in series to the backlight controller 340. The backlight controller 340 controls each column of backlight driver chips in series in parallel. Furthermore, each column of backlight driver chips 210 has its own address data. In a specific implementation, the address data of the backlight driver chips 210 can be arranged in a step-by-step increment along a first direction, which is the direction of data transmission.

[0088] It should be noted that the backlight controller in the embodiment of the present application includes at least one.

[0089] like Figure 3As shown, it is a partial structural diagram of a backlight unit provided by the related art, where each backlight driver chip is connected to an LED of one color, for example, the backlight driver chip 111 is connected to two RLEDs, the backlight driver chip 112 is connected to two GLEDs, and the backlight driver chip 113 is connected to two BLEDs; the LEDs connected to each column of backlight driver chips are the same color, for example, the LEDs connected to the backlight driver chip 111 and the backlight driver chip 121 are both RLEDs, i.e., red LEDs, the LEDs connected to the backlight driver chip 112 and the backlight driver chip 122 are both GLEDs, i.e., green LEDs, and the LEDs connected to the backlight driver chip 113 and the backlight driver chip 123 are both BLEDs, i.e., blue LEDs.

[0090] Figure 3 In the backlight driver chip, each column is connected in series through a data line. Each backlight driver chip also has a power line to supply power to the backlight driver chip. The data line and the power line are connected in series. Figure 3 Not shown.

[0091] like Figure 4A The figure shows a schematic diagram of a driving architecture of a backlight unit provided by an embodiment of the present application. A backlight driver chip includes two data line ports, namely a first data line port DI and a second data line port DO. The same data line port of the backlight driver chip can be defined as the input port of the backlight driver chip, i.e., the data input port, or as the output port of the backlight driver chip, i.e., the data output port. When multiple backlight driver chips are connected, the first data line port DI can be connected to the second data line port DO of the previous level backlight driver chip, and the second data line port DO can be connected to the first data line port DI of the next level backlight driver chip. The first data line port DI of the first level backlight driver chip is connected to the backlight controller. The backlight driver chips are connected in series and can transmit target dimming data step by step. The clock port of each backlight driver chip is connected to the backlight controller for transmitting the clock signal CLK. The second data line port DO of the last level backlight driver chip serves as a feedback port and is connected to the backlight controller for transmitting the feedback signal Feedback.

[0092] In a specific implementation, the transmission of the signal in the backlight unit can also be carried out as follows Figure 4B The driving architecture shown in the figure uses one wire harness to transmit the feedback signal and one wire harness to transmit the clock signal and target dimming data. Figure 4C The driving architecture shown uses a single wire harness to transmit clock signal, feedback signal, and target dimming data.

[0093] Refer to the above Figure 2 、 Figure 3 、 Figure 4A 、 Figure 4B and Figure 4C The zone dimming technology in Mini LED RGB backlight technology can divide the backlight into thousands or even more zones for precise control. The backlight driver chip used in Mini LED RGB backlight technology is usually the backlight driver chip of traditional Mini LED monochrome backlight, that is, each backlight driver chip is connected to one color of LED. The backlight driver chip drives the brightness of RGB Mini LED, and each column of backlight driver chips on the backlight unit needs to be connected to one color of LED. Since the voltages of the three colors of Mini LED are different, the three colors of RGB LED are powered by different power supplies (red power module R_POWER, green power module G_POWER, blue power module B_POWER).

[0094] Since one backlight driver chip is connected to one color of Mini LED, that is, one backlight driver chip can only control one color of Mini LED, refer to Figure 2 , regardless of taking Figure 4A 、 Figure 4B 、 Figure 4C Whichever driving architecture is used, due to the complex transmission lines of the backlight driver chip, a multi-layer circuit board or a single-layer circuit board with many jumpers is required, which increases the complexity of the layout circuits within the backlight unit and increases the number of pins of the connector used to connect the backlight driver chip and the backlight controller, resulting in high costs.

[0095] It should be noted that Figure 2 、 Figure 3 、 Figure 4A 、 Figure 4B and Figure 4C The architecture of the backlight unit shown is for illustrative purposes only. In actual applications, the number of backlight controllers in the display device can be adaptively set according to the number of backlight units set on the backlight unit, and is not limited to one. One backlight controller can control one or more backlight units, and the embodiments of the present application do not impose any restrictions on this. In addition, the position of the backlight controller, and the connection method between the backlight controller and the backlight unit can be flexibly set, and the embodiments of the present application do not impose any restrictions on this.

[0096] In order to solve the above problems, the embodiments of the present application provide a brightness adjustment method, a backlight driver chip and a backlight module, such as Figure 5 FIG. 1 is an application scenario diagram of an embodiment of the present application. Figure 5In the process, the SoC sends local dimming data to the backlight controller. After receiving the local dimming data, the backlight controller sends display data to the backlight driver chip in the backlight unit. The backlight driver chip in the backlight module returns monitoring data. The backlight controller adjusts the input voltage to each RGB Mini LED based on the received monitoring data.

[0097] It should be noted that Figure 5 The SoC mentioned above may also be other devices such as a GPU, and this embodiment of the present application does not impose any limitation on this.

[0098] The brightness adjustment method, backlight driver chip and backlight module provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0099] like Figure 6 FIG. 1 is a flow chart of a brightness adjustment method provided in an embodiment of the present application. The brightness adjustment method is applied to a backlight module. The backlight module includes a backlight controller and multiple backlight driver chips. Each backlight driver chip is electrically connected to LEDs of N colors. Each backlight driver chip includes M drive channels. Each drive channel is provided with at least one LED. N is a positive integer greater than 1, and M is greater than or equal to N. The brightness adjustment method specifically includes the following steps:

[0100] S601: After receiving the display data, the backlight driver chip controls the brightness of the LEDs in each driving channel according to the target brightness data corresponding to the backlight driver chip in the display data;

[0101] S602: The backlight driver chip monitors the channel voltage of each driving channel, generates monitoring data based on the monitored channel voltage and the color of the LED in each driving channel, and sends the monitoring data to the backlight controller. After receiving the monitoring data, the backlight controller adjusts the current input voltage of the LED of each color to the target input voltage based on the monitoring data.

[0102] The brightness adjustment method provided in this application is applied to a backlight module, which includes a backlight controller and multiple backlight driver chips. Each backlight driver chip is electrically connected to N colors of LEDs, and each backlight driver chip includes M drive channels, each drive channel is provided with at least one LED, N is a positive integer greater than 1, and M is greater than or equal to N. The backlight driver chip controls the brightness of the LED in each drive channel based on received display data and its corresponding target brightness data, and generates monitoring data based on the monitored channel voltage of each drive channel and the color of the LED in each drive channel. For each color of LED, the backlight controller adjusts the current input voltage of the LED of that color to the target input voltage based on the received monitoring data. Because the backlight driver chip is electrically connected to the N colors of LEDs, N is a positive integer greater than 1, and the backlight driver chip can generate monitoring data based on the monitored channel voltage of each drive channel and the color of the LED in each drive channel, the backlight controller can adjust the input voltage of the different colors of LEDs based on the received monitoring data, thereby simplifying the wiring of the backlight unit and reducing costs.

[0103] A frame of display data received by the backlight driver chip may include but is not limited to: a communication identification code, a backlight driver function instruction, a backlight driver chip address data and brightness data, wherein the communication identification code may be a frame header (Indication), which represents the starting position of the display data and is used to distinguish different display data, including but not limited to error-proofing codes; the backlight driver function instruction is used to enable corresponding functions, and the corresponding functions include but are not limited to: a delay function, a voltage fast feedback function, a black insertion function, an open circuit (open) detection function, a short circuit (short) detection function, etc., wherein the data size occupied by each function can be set according to the actual application, or it can be a fixed data size, and the embodiment of the present application does not make specific restrictions on this; the backlight driver chip address data is used by the backlight driver chip to extract the brightness data corresponding to the backlight driver chip.

[0104] like Figure 7 FIG. 1 is a schematic diagram of a display data structure provided by an embodiment of the present application. The backlight driver chip address data includes address data 1, address data 2, ..., address data m, and the brightness data includes brightness data 1, brightness data 2, ..., brightness data m. The backlight driver chips in the display unit include backlight driver chip 1, backlight driver chip 2, ..., backlight driver chip m connected in series. Backlight driver chip 1 is connected to the backlight controller. The address data of backlight driver chip 1 is address data 1, the address data of backlight driver chip 2 is address data 2, ..., and the address data of backlight driver chip m is chip address data m.

[0105] The backlight controller will Figure 7The display data shown in is sent to backlight driver chip 1, and backlight driver chip 1 sends the received display data to backlight driver chip 2..., and backlight driver chip (m-1) sends the received display data to backlight driver chip m. After backlight driver chip 1 receives the display data, it uses brightness data 1 after address data 1 as the target brightness data of backlight driver chip 1. After backlight driver chip 2 receives the brightness data, it uses brightness data 2 after address data 2 as the target brightness data of backlight driver chip 2, ..., after backlight driver chip m receives the brightness data, it uses brightness data m after address data m as the target brightness data of backlight driver chip m.

[0106] After the backlight driving chip determines the target brightness data corresponding to the backlight driving chip from the display data, the backlight driving chip controls the brightness of the LED in each driving channel based on the determined target brightness data.

[0107] like Figure 8 As shown, it is a partial structural diagram of a backlight unit provided in an embodiment of the present application. Each backlight driver chip is electrically connected to LEDs of three colors, and each backlight driver chip includes six driving channels, and each driving channel is provided with three LEDs. For example, the backlight driver chip 111 is electrically connected to LEDs of three colors, namely RLED, GLED and BLED. The backlight driver chip 111 includes six driving channels, driving channel 1 includes three RLEDs, driving channel 4 includes three red LEDs, driving channel 2 includes three GLEDs, driving channel 5 includes three GLEDs, driving channel 3 includes three BLEDs, and driving channel 6 includes three BLEDs.

[0108] It should be noted that Figure 8 Only some LEDs and some backlight driver chips in the backlight unit are shown.

[0109] in addition, Figure 8 The backlight driver chip shown in FIG is also connected to ground GND. VDD is the supply voltage for the backlight driver chip, and the supply voltage for each LED is VLED. The supply voltage VDD for the backlight driver chip and the supply voltage VLED for each LED enable the backlight driver chip and each LED to operate normally under their respective supply voltages.

[0110] from Figure 3 and Figure 8 It can be seen that Figure 8 The wiring in the backlight unit provided in the embodiment of the present application is compared with Figure 3 The related art provides a simpler wiring in the backlight unit. Figure 8 The backlight unit provided in the embodiment of the present application can adopt a single panel, thereby reducing costs.

[0111] The LEDs in the embodiments of the present application may be Mini LEDs, and the N colors of LEDs may include: red LEDs, green LEDs, and blue LEDs, thereby forming an RGB backlight. RGB backlighting uses three colors of LEDs (R (red), G (green), and B (blue)) to mix different colors, thereby achieving better color performance and wider color gamut coverage.

[0112] Of course, in addition to including red LEDs, green LEDs and blue LEDs to form RGB backlight, the N colors of LEDs can also use other backlighting methods known to those skilled in the art, such as but not limited to RGBW backlight, that is, using four colors of LEDs R (red), G (green), B (blue), and W (white) to mix backlights of different colors. The specific settings can be made according to actual needs, and the embodiments of the present application are not limited to this.

[0113] In an embodiment of the present application, the backlight driver chip monitors the channel voltage of each driver channel while controlling the brightness of the LEDs in each driver channel. Based on the monitored channel voltage and the color of the LEDs in each driver channel, monitoring data is generated and sent to the backlight controller. In a specific implementation, two methods for generating monitoring data are included, each of which is described in detail below.

[0114] In one embodiment, a method for generating monitoring data provided by an embodiment of the present application is: for each driving channel, the backlight driving chip determines the color identifier corresponding to the color of the LED in the driving channel, and uses the color identifier and the channel voltage of the driving channel as a group of sub-monitoring data; each group of sub-monitoring data is used as monitoring data.

[0115] After the backlight driver chip generates monitoring data, it sends the monitoring data to the backlight controller. After the backlight controller receives the monitoring data, for each color of LED, the backlight controller determines multiple channel voltages corresponding to the color identification of the color from the monitoring data; among the multiple channel voltages determined, if there is a channel voltage less than a first threshold, the current input voltage of the LED corresponding to the color identification is increased; among the multiple channel voltages determined, if the channel voltages are all greater than or equal to the first threshold, and there is a channel voltage greater than or equal to the second threshold, the current input voltage of the LED corresponding to the color identification is decreased, wherein the second threshold is greater than the first threshold.

[0116] For example, reference Figure 8The backlight driver chip 111 includes 6 driving channels, generates 6 groups of sub-monitoring data, takes the 6 groups of sub-monitoring data as monitoring data 1, and sends monitoring data 1 to the backlight controller, wherein sub-monitoring data 1 is the monitoring data of driving channel 1, including the red corresponding identifier "R" and channel voltage U1, sub-monitoring data 2 is the monitoring data of driving channel 2, including the green corresponding identifier "G" and channel voltage U2, sub-monitoring data 3 is the monitoring data of driving channel 3, including the blue corresponding identifier "B" and channel voltage U3, sub-monitoring data 4 is the monitoring data of driving channel 4, including the red corresponding identifier "R" and channel voltage U4, sub-monitoring data 5 is the monitoring data of driving channel 5, including the green corresponding identifier "G" and channel voltage U5, sub-monitoring data 6 is the monitoring data of driving channel 6, including the blue corresponding identifier "B" and channel voltage U6; the monitoring data 1 generated by the backlight driver chip 111 is "R, U1, G, U2, B, U3, R, U4, G, U5, B, U6".

[0117] The backlight driver chip 121 includes 6 driving channels, generates 6 groups of sub-monitoring data, uses the 6 groups of sub-monitoring data as monitoring data 2, and sends monitoring data 2 to the backlight controller, wherein sub-monitoring data 7 is the monitoring data of driving channel 7, including the red corresponding mark "R" and channel voltage U7, sub-monitoring data 8 is the monitoring data of driving channel 8, including the green corresponding mark "G" and channel voltage U8, sub-monitoring data 9 is the monitoring data of driving channel 9, including the blue corresponding mark "B" and channel voltage U9, Sub-monitoring data 10 is the monitoring data of driving channel 10, including the logo "R" corresponding to red and the channel voltage U10; sub-monitoring data 11 is the monitoring data of driving channel 11, including the logo "G" corresponding to green and the channel voltage U11; sub-monitoring data 12 is the monitoring data of driving channel 12, including the logo "B" corresponding to blue and the channel voltage U12; the monitoring data 2 generated by the backlight driver chip 121 is "R, U7, G, U8, B, U9, R, U10, G, U11, B, U12".

[0118] After receiving monitoring data 1 and monitoring data 2, the backlight controller compares the channel voltages U1, U4, U7, and U10 corresponding to the red mark "R" with the first threshold value respectively. If there is a channel voltage less than the first threshold value among U1, U4, U7, and U10, the current input voltage of the red LED corresponding to the red mark R is increased, that is, the output voltage of the red power module is increased. If U1, U4, U7, and U10 are all greater than or equal to the first threshold value, and there is a voltage greater than or equal to the second threshold value, the current input voltage of the red LED corresponding to the red mark R is reduced, that is, the output voltage of the red power module is reduced.

[0119] The backlight controller compares the channel voltages U2, U5, U8, and U11 corresponding to the green identifier "G" in monitoring data 1 and monitoring data 2 with the first threshold value respectively. If any of U2, U5, U8, and U11 has a channel voltage less than the first threshold value, the current input voltage of the green LED corresponding to the green identifier R is increased, that is, the output voltage of the green power module is increased. If U2, U5, U8, and U11 are all greater than or equal to the first threshold value, and any of them has a voltage greater than or equal to the second threshold value, the current input voltage of the green LED corresponding to the green identifier G is reduced, that is, the output voltage of the green power module is reduced.

[0120] The backlight controller compares the channel voltages U3, U6, U9 and U12 corresponding to the blue identifier "B" in monitoring data 1 and monitoring data 2 with the first threshold value respectively. If there is a channel voltage less than the first threshold value among U3, U6, U9 and U12, the current input voltage of the blue LED corresponding to the blue identifier B is increased, that is, the output voltage of the blue power module is increased. If U3, U6, U9 and U12 are all greater than or equal to the first threshold value, and there is a voltage greater than or equal to the second threshold value, the current input voltage of the blue LED corresponding to the blue identifier B is reduced, that is, the output voltage of the blue power module is reduced.

[0121] It should be noted that monitoring data is also transmitted level by level, for example, Figure 8 In the embodiment, the backlight driver chip 121 is connected to the backlight controller, the backlight driver chip 111 sends the monitoring data 1 to the backlight driver chip 121, and the backlight driver chip 121 sends the monitoring data 1 to the backlight controller, and the backlight driver chip 121 also sends the monitoring data 2 to the backlight controller.

[0122] In another embodiment, another method of generating monitoring data provided by the embodiment of the present application is that the backlight driver chip determines the color of the LED in each driving channel; for each color of LED, the backlight driver chip determines the voltage state corresponding to the LED of that color based on the channel voltage of the target driving channel, wherein the target driving channel includes the LED of that color; the color identification of the color and the voltage state corresponding to the LED of that color are used as a group of sub-monitoring data; and each group of sub-monitoring data is used as monitoring data.

[0123] Specifically, when determining the voltage state corresponding to the LED of the color, if the backlight driver chip determines that there is a channel voltage less than a first threshold value in the channel voltage of the target drive channel, then the voltage state corresponding to the LED of the color is determined to be a low voltage state;

[0124] Among the channel voltages of the target drive channel, the backlight driver chip determines that all channel voltages are greater than or equal to a first threshold, and there is a channel voltage greater than or equal to a second threshold, then determines that the voltage state corresponding to the LED of this color is a high voltage state, wherein the first threshold is less than the second threshold.

[0125] For example, reference Figure 8 The backlight driver chip 111 includes 6 driving channels, driving channel 1 and driving channel 4 each include 3 red LEDs, driving channel 2 and driving channel 5 each include 3 green LEDs, and driving channel 3 and driving channel 6 each include 3 blue LEDs;

[0126] For the backlight driver chip 111, the color of the LED included in the driving channel 1 and the driving channel 4 is red, the channel voltage corresponding to the driving channel 1 is U1, and the channel voltage corresponding to the driving channel 4 is U4. The color of the LED included in the driving channel 2 and the driving channel 5 is green, the channel voltage corresponding to the driving channel 2 is U2, and the channel voltage corresponding to the driving channel 5 is U5. The color of the driving channel 3 and the LED included in the driving channel 3 is blue, the channel voltage corresponding to the driving channel 3 is U3, and the channel voltage corresponding to the driving channel 6 is U6;

[0127] For the red LED, the backlight driver chip 111 uses drive channel 1 and drive channel 4 as target drive channels, and compares the channel voltage U1 and the channel voltage U4 with the first threshold value respectively. If there is a voltage less than the first threshold value in the channel voltage U1 and the channel voltage U4, the voltage state corresponding to the red LED is determined to be "LOW", that is, a low voltage state. If the channel voltage U1 and the channel voltage U4 are both greater than or equal to the first threshold value, and there is a voltage greater than or equal to the second threshold value in the channel voltage U1 and the channel voltage U4, the voltage state corresponding to the red LED is determined to be "HIGH", that is, a high voltage state.

[0128] The backlight driver chip 111 uses drive channel 2 and drive channel 5 as target drive channels for the green LED, and compares the channel voltage U2 and the channel voltage U5 with the first threshold value respectively. If there is a voltage less than the first threshold value in the channel voltage U2 and the channel voltage U5, the voltage state corresponding to the green LED is determined to be "LOW", that is, a low voltage state. If the channel voltage U2 and the channel voltage U5 are both greater than or equal to the first threshold value, and there is a voltage greater than or equal to the second threshold value in the channel voltage U2 and the channel voltage U5, the voltage state corresponding to the green LED is determined to be "HIGH", that is, a high voltage state.

[0129] The backlight driver chip 111 uses the driving channel 3 and the driving channel 6 as the target driving channels for the blue LED, and compares the channel voltage U3 and the channel voltage U6 with the first threshold value respectively. If there is a voltage less than the first threshold value in the channel voltage U3 and the channel voltage U6, the voltage state corresponding to the blue LED is determined to be "LOW", that is, a low voltage state. If the channel voltage U3 and the channel voltage U6 are both greater than or equal to the first threshold value, and there is a voltage greater than or equal to the second threshold value in the channel voltage U3 and the channel voltage U6, the voltage state corresponding to the blue LED is determined to be "HIGH", that is, a high voltage state.

[0130] The monitoring data finally generated by the backlight driving chip 111 is “R, voltage state 1, G, voltage state 2, B, voltage state 3”.

[0131] After the backlight driver chip generates monitoring data, it sends the monitoring data to the backlight controller. After the backlight controller receives the monitoring data, for each color of LED, the backlight controller determines multiple voltage states corresponding to the color identification of that color from the monitoring data; if the backlight controller determines that there is a low voltage state among the multiple voltage states, the current voltage of the LED of that color is increased; if it determines that there is no low voltage state among the multiple voltage states and a high voltage state exists, the current voltage of the LED of that color is decreased.

[0132] For example, refer to Figure 8 The backlight controller is electrically connected to the backlight driver chip 121, and the backlight driver chip 121 is electrically connected to the backlight driver chip 111. The monitoring data 1 generated by the backlight driver chip 111 is "R, LOW, G, HIGH, B, LOW", and the monitoring data 2 generated by the backlight driver chip 121 is "R, LOW, G, LOW, B, LOW". The backlight driver chip 111 sends the generated monitoring data 1 to the backlight driver chip 121, and the backlight driver chip 121 sends the generated monitoring data 1 to the backlight controller. The backlight driver chip 121 sends the generated monitoring data 2 to the backlight controller.

[0133] After receiving monitoring data 1 and monitoring data 2, the backlight controller determines that the voltage state corresponding to "R" is "LOW" and "LOW". If it is determined that a low voltage state exists, the current output voltage of the red LED is increased, that is, the output voltage of the red voltage module is increased; the backlight controller determines that the voltage state corresponding to "G" is "HIGH" and "LOW". If it is determined that a low voltage state exists, the current output voltage of the green LED is increased, that is, the output voltage of the green voltage module is increased; the backlight controller determines that the voltage state corresponding to "B" is "LOW" and "LOW". If it is determined that a low voltage state exists, the current output voltage of the blue LED is increased, that is, the output voltage of the blue voltage module is increased.

[0134] The embodiments of the present application provide two methods for generating monitoring data. The backlight driver chip uses color identification and voltage status as monitoring data. Compared with the backlight driver chip using color identification and all monitored channel voltages as monitoring data, this can reduce data transmission and improve data transmission efficiency.

[0135] Through the above embodiment, after the backlight driver chip generates monitoring data, it sends the monitoring data to the backlight controller. If the backlight driver chip is directly connected to the backlight controller, that is, the backlight driver chip is located in the first stage of the backlight driver chips connected in series, then the backlight driver chip will send the generated monitoring data directly to the backlight controller; if the backlight driver chip is not directly connected to the backlight controller, that is, the backlight driver chip is located in a non-first stage of the backlight driver chips connected in series, then the backlight driver chip will send the generated monitoring data to the upper-level backlight driver chip connected to the backlight driver chip, and the upper-level backlight driver chip will then send the monitoring data to the upper-level backlight driver chip connected to the upper-level backlight driver chip, and so on, until the monitoring data is sent to the backlight controller.

[0136] For example, Figure 9 FIG. 1 is a partial schematic diagram of a backlight unit provided in an embodiment of the present application. Figure 9 In the figure, the first column of backlight driver chips connected in series includes backlight driver chip 1, backlight driver chip 2, backlight driver chip 3 and backlight driver chip 4. The backlight controller sends display data, the display data is transmitted to backlight driver chip 1, then transmitted from backlight driver chip 1 to backlight driver chip 2, then transmitted from backlight driver chip 2 to backlight driver chip 3, and finally transmitted from backlight driver chip 3 to backlight driver chip 4.

[0137] After receiving the display data sent by the backlight controller, the backlight driver chip 1 controls the brightness of the LED in the driving channel of the backlight driver chip 1. In the process of controlling the brightness of the LED, monitoring data 1 is generated. After receiving the display data sent by the backlight driver chip 1, the backlight driver chip 2 controls the brightness of the LED in the driving channel of the backlight driver chip 2. In the process of controlling the brightness of the LED, monitoring data 2 is generated. After receiving the display data sent by the backlight driver chip 2, the backlight driver chip 3 controls the brightness of the LED in the driving channel of the backlight driver chip 3. In the process of controlling the brightness of the LED, monitoring data 3 is generated. After receiving the display data sent by the backlight driver chip 3, the backlight driver chip 4 controls the brightness of the LED in the driving channel of the backlight driver chip 4. In the process of controlling the brightness of the LED, monitoring data 4 is generated.

[0138] Backlight driver chip 1 sends the generated monitoring data 1 to the backlight controller 340, backlight driver chip 2 sends the generated monitoring data 2 to the backlight controller 340 through backlight driver chip 2, backlight driver chip 3 sends the generated monitoring data 3 to the backlight controller 340 through backlight driver chip 2 and backlight driver chip 1, backlight driver chip 4 sends the generated monitoring data 4 to the backlight controller 340 through backlight driver chip 3, backlight driver chip 2 and backlight driver chip 1, and the backlight controller 340 receives the monitoring data in sequence. Figure 10 shown.

[0139] The backlight controller 340 receives Figure 10 After the multiple monitoring data are obtained, the current output voltage of the LED is controlled based on the multiple monitoring data. The specific method can refer to the above method and will not be repeated here.

[0140] In one embodiment, after controlling the brightness of the LEDs in each driving channel, the backlight driver chip can, in addition to monitoring the channel voltage, also determine relevant operating data of the backlight driver chip and place the relevant operating data in the monitoring data. After receiving the monitoring data, the backlight controller performs corresponding operations based on the relevant operating data in the monitoring data.

[0141] Among them, the relevant working data includes part or all of the following: open circuit status data of each LED in each driving channel of the backlight driver chip, short circuit status data of each LED in each driving channel of the backlight driver chip, fault status data of the backlight driver chip, temperature data of the backlight driver chip, and input and output circuit breaker data of the backlight driver chip.

[0142] like Figure 11 As shown, it is a structural schematic diagram of another monitoring data provided in an embodiment of the present application, wherein the monitoring data includes relevant working data, wherein the relevant working data includes open circuit state data of each LED in each driving channel of the backlight driver chip (i.e., open circuit R, open circuit G, and open circuit B), short circuit state data of each LED in each driving channel of the backlight driver chip (i.e., short circuit R, short circuit G, and short circuit B), fault state data of the backlight driver chip (i.e., fault state), temperature data of the backlight driver chip (i.e., temperature T), and input and output disconnection data of the backlight driver chip.

[0143] In a specific implementation, the address data of the backlight driver chip can also be placed in the monitoring data, for example, Figure 12 As shown, after receiving the monitoring data, the backlight controller determines the target backlight driver chip based on the address data in the monitoring data, and then performs corresponding operations on the target backlight driver chip based on the relevant working data in the monitoring data.

[0144] If each backlight driver chip connected in series returns a piece of monitoring data, the backlight controller can determine the monitoring data corresponding to each backlight driver chip according to the order of the received monitoring data, and thus can perform corresponding operations on the backlight driver chip corresponding to the monitoring data based on the relevant working data in the monitoring data; if only some of the backlight driver chips connected in series return monitoring data, for example, Figure 9 Among the backlight driver chips 1, 2, 3 and 4 connected in series, only the backlight driver chip 1 and the backlight driver chip 3 return monitoring data. At this time, after the backlight controller receives the monitoring data, it cannot determine which backlight driver chip the received monitoring data corresponds to. Therefore, the address data is inserted into the monitoring data. The backlight controller determines the target backlight driver chip based on the address data in the monitoring data, and then performs corresponding operations on the target backlight driver chip based on the relevant working data in the monitoring data, thereby improving the accuracy of control.

[0145] In one embodiment, the display data may further include a target function instruction signal. After receiving the display data, the backlight driver chip determines the target function instruction signal corresponding to the backlight driver chip from the display data; the backlight driver chip monitors the channel voltage of each driving channel of the backlight driver chip based on the target function instruction signal.

[0146] In an embodiment of the present application, after the backlight driver chip determines the target function instruction signal corresponding to the backlight driver chip from the display data, it determines the channel voltage of each LED connected to the backlight driver chip based on the target function instruction signal. If the display data does not include the target function instruction signal, the backlight driver chip does not perform the step of determining the channel voltage of the LED, thereby reducing waste of resources.

[0147] Based on the same inventive concept, an embodiment of the present invention further provides a backlight driver chip. The implementation principle of the backlight driver chip is similar to the implementation principle of the aforementioned brightness adjustment method. The specific implementation method of the backlight driver chip can be referred to the aforementioned brightness adjustment method embodiment, and the repeated parts will not be repeated.

[0148] like Figure 13 FIG. 1 is a schematic diagram of the structure of a backlight driver chip provided in an embodiment of the present application. The backlight driver chip is applied to a backlight module. The backlight module includes a backlight controller and multiple backlight driver chips. The backlight driver chip includes:

[0149] Input terminal DI is used to input display data or output monitoring data;

[0150] Output terminal DO is used to output display data or input monitoring data;

[0151] The input / output module 1001 is used to send the display data inputted from the input terminal DI to the logic module 1002 and the output terminal DO, or to send the monitoring data to the input terminal DI;

[0152] Logic module 1002, configured to receive display data and determine target brightness data corresponding to the backlight driver chip from the display data;

[0153] The driving module 1003 is configured to electrically connect to a plurality of LEDs via M driving channels and control the brightness of the plurality of LEDs based on target brightness data, wherein the plurality of LEDs include LEDs of N colors, where N is a positive integer greater than 1 and M is greater than or equal to N; monitor the channel voltage of each driving channel; and transmit the monitored channel voltage to the feedback function module;

[0154] The feedback function module 1004 is used to generate monitoring data based on the monitored voltage of each channel and the color of the LED in each driving channel; and send the monitoring data to the input and output module 1001;

[0155] After receiving the monitoring data, the backlight controller adjusts the current input voltage of each color LED to the target input voltage based on the monitoring data.

[0156] Among them, the input and output module 1001 is electrically connected to the logic module 1002, the logic module 1002 is electrically connected to the driving module 1003, the driving module is connected to multiple LEDs, and the feedback function module 1004 is electrically connected to the input and output module 1001, the logic module 1002, and the driving module 1003.

[0157] In an embodiment of the present application, the backlight module adopts an internal tube single-line drive architecture, that is, multiple backlight driver chips arranged in the same column are connected in series through a signal line. The signal line can realize both the transmission of display data and the transmission of monitoring data through time-sharing multiplexing. Among them, the display data is output by the backlight controller and transmitted from the first backlight driver chip to the last backlight driver chip. The monitoring data is output by the backlight driver chip and finally transmitted to the backlight controller.

[0158] In the process of transmitting monitoring data to the backlight controller, it is necessary to perform DI (input) / DO (output) direction conversion on the backlight driver chip, that is, converting the input end of the backlight driver chip to the output end, and converting the output end of the backlight driver chip to the input end, so as to realize data return. In the display cycle of a frame of image, it is usually necessary to transmit the display data first, and after the display data transmission is completed, the DI / DO direction conversion is performed to return the monitoring data, and the DI / DO direction conversion takes a certain amount of time to complete. The embodiment of the present application does not specifically limit the method for performing DI / DO direction conversion on the backlight driver chip.

[0159] In specific implementation, Figure 13 As shown, the backlight driver chip also includes a power module and a clock module (OSC module), wherein the power module is connected to an external power supply and is used to provide a power supply voltage VDD for the backlight driver chip. The power module can be a low dropout linear regulator (LDO) or a step-down DC-DC converter (BUCK), and this application does not impose specific restrictions on this; the clock module is used to provide a clock source.

[0160] In one embodiment, the feedback function module 1004 is specifically configured to:

[0161] For each driving channel, determining a color identifier corresponding to the color of the LED in the driving channel, using the color identifier and the driving voltage of the driving channel as a set of sub-monitoring data; and using each sub-monitoring data as the monitoring data;

[0162] For each color of LED, the backlight controller determines multiple channel voltages corresponding to the color identification of the color from the monitoring data. When determining that among the multiple channel voltages, there is a channel voltage less than a first threshold, the current input voltage of the LED corresponding to the color identification is increased. When determining that among the multiple channel voltages, all channel voltages are greater than or equal to the first threshold, and there is a channel voltage greater than or equal to the second threshold, the current input voltage of the LED corresponding to the color identification is decreased, wherein the second threshold is greater than the first threshold.

[0163] In one embodiment, the feedback function module 1004 is specifically configured to:

[0164] Determining the color of an LED in each driving channel; for each color LED, determining a voltage state corresponding to the color LED based on a channel voltage of a target driving channel, wherein the target driving channel includes the color LED; using the color identifier of the color and the voltage state corresponding to the color LED as a set of sub-monitoring data; and using each set of sub-monitoring data as the monitoring data;

[0165] For each color of LED, the backlight controller determines multiple voltage states corresponding to the color identification of the color from the monitoring data; if it is determined that a low voltage state exists among the multiple voltage states, the current voltage of the LED of the color is increased; if it is determined that a high voltage state exists and no low voltage state exists among the multiple voltage states, the current voltage of the LED of the color is decreased.

[0166] In one embodiment, the feedback function module 1004 is specifically configured to:

[0167] Among the channel voltages of the target driving channel, if it is determined that there is a channel voltage less than a first threshold, then the voltage state corresponding to the LED of the color is determined to be a low voltage state; among the channel voltages of the target driving channel, if it is determined that all channel voltages are greater than or equal to the first threshold and there is a channel voltage greater than or equal to a second threshold, then the voltage state corresponding to the LED of the color is determined to be a high voltage state, wherein the first threshold is less than the second threshold.

[0168] In one embodiment, the feedback function module 1004 is further configured to:

[0169] Determining relevant working data of the backlight driver chip, placing the relevant working data in the monitoring data, and after the backlight controller receives the monitoring data, performing corresponding operations based on the relevant working data in the monitoring data;

[0170] Among them, the relevant working data includes part or all of the following: open circuit state data of each LED in each driving channel of the backlight driver chip, short circuit state data of each LED in each driving channel of the backlight driver chip, fault state data of the backlight driver chip, temperature data of the backlight driver chip, and input and output circuit breaker data of the backlight driver chip.

[0171] like Figure 14 , which is a structural diagram of a feedback function module provided in an embodiment of the present application, the feedback function module includes an LED open circuit detection module 1601, an LED short circuit detection module 1602, a temperature detection module 1603, a fault detection module 1604, and an input / output module open circuit detection module 1605;

[0172] The LED open circuit detection module 1601 generates open circuit status data of each LED connected to the backlight driver chip by monitoring the voltage between the backlight driver chip and the corresponding LED connection pin. For example, if the voltage of the corresponding LED connection pin is determined to be 0V, it is determined to be open circuit;

[0173] The LED short circuit detection module 1602 generates short circuit status data of each LED connected to the backlight driver chip by monitoring the voltage between the backlight driver chip and the LED connection pin. For example, if the voltage of the corresponding LED connection pin is determined to be the supply voltage, it is determined to be short circuited.

[0174] The temperature detection module 1603 generates temperature data of the backlight driver chip by detecting the temperature of the backlight driver chip;

[0175] The fault detection module 1604 generates fault status data of the backlight driver chip by monitoring the internal signals of the backlight driver chip, such as the internal voltage of the backlight driver chip, clk, etc.;

[0176] The input-output module circuit breaker detection module 1605 generates input-output circuit breaker data of the backlight driver chip by monitoring the input terminal DI and output terminal DO connected to the signal line between the backlight driver chip. For example, if there is no signal in DI and DO between this backlight driver chip and the previous backlight driver chip for a long time, it is determined that the signal line between this backlight driver chip and the previous backlight driver chip is short-circuited.

[0177] In one embodiment, the feedback function module 1004 is further configured to:

[0178] The address data corresponding to the backlight driver chip is placed in the monitoring data. After receiving the monitoring data, the backlight controller determines the target backlight driver chip based on the address data in the monitoring data, and performs corresponding operations on the target backlight driver chip based on the relevant working data in the monitoring data.

[0179] In one embodiment, after receiving the display data, the logic module 1002 is further configured to:

[0180] Determining a target function instruction signal corresponding to the backlight driver chip from the display data;

[0181] The driver module 1003 is further configured to:

[0182] Based on the target function instruction signal, a channel voltage of each LED connected to the backlight driving chip is monitored.

[0183] Based on the same inventive concept, an embodiment of the present application also provides a backlight module, including a backlight controller and a backlight driver chip as described in any one of the above items. The implementation principle of the backlight module is similar to the implementation principle of the aforementioned backlight driver chip. The specific implementation method of the backlight module can be referred to the embodiment of the aforementioned backlight driver chip, and the repeated parts will not be repeated.

[0184] The present application provides a brightness adjustment method, a backlight driver chip, and a backlight module. The backlight module includes a backlight controller and multiple backlight driver chips. Each backlight driver chip is electrically connected to N colors of LEDs, and each backlight driver chip includes M drive channels, each drive channel is provided with at least one LED, N is a positive integer greater than 1, and M is greater than or equal to N. The backlight driver chip controls the brightness of the LED in each drive channel based on received display data and its corresponding target brightness data, and generates monitoring data based on the monitored channel voltage of each drive channel and the color of the LED in each drive channel. For each color of LED, the backlight controller adjusts the current input voltage of the LED of that color to the target input voltage based on the received monitoring data. Because the backlight driver chip is electrically connected to the N colors of LEDs, N is a positive integer greater than 1, and the backlight driver chip can generate monitoring data based on the monitored channel voltage of each drive channel and the color of the LED in each drive channel, the backlight controller can adjust the input voltage of the different colors of LEDs based on the received monitoring data, thereby simplifying the wiring of the backlight unit and reducing costs.

[0185] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0186] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0187] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0188] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0189] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A brightness adjustment method, characterized in that: Applied to a backlight module, the backlight module includes a backlight controller and multiple backlight driver chips, each backlight driver chip is electrically connected to LEDs of N colors, and each backlight driver chip includes M driver channels, each driver channel is provided with at least one LED, N is a positive integer greater than 1, and M is greater than or equal to N. The method includes: After receiving the display data, the backlight driver chip controls the brightness of the LED in each driving channel according to the target brightness data corresponding to the backlight driver chip in the display data; The backlight driver chip monitors the channel voltage of each driving channel, generates monitoring data based on the monitored channel voltage and the color of the LED in each driving channel, and sends the monitoring data to the backlight controller. After receiving the monitoring data, the backlight controller adjusts the current input voltage of the LED of each color to the target input voltage based on the monitoring data.

2. The method according to claim 1, characterized in that The monitoring data is generated based on the monitored voltage of each channel and the color of the LED in each driving channel, including: For each driving channel, the backlight driving chip determines a color identifier corresponding to the color of the LED in the driving channel, and uses the color identifier and the channel voltage of the driving channel as a set of sub-monitoring data; The backlight driving chip uses each group of sub-monitoring data as the monitoring data; The step of adjusting, for each color LED, a current input voltage of the color LED to a target input voltage based on the monitoring data includes: For each color of LED, the backlight controller determines a plurality of channel voltages corresponding to the color identifier of the color from the monitoring data; When the backlight controller determines that among the multiple channel voltages, there is a channel voltage that is less than the first threshold, the current input voltage of the LED corresponding to the color identification is increased; when it determines that among the multiple channel voltages, all channel voltages are greater than or equal to the first threshold, and there is a channel voltage that is greater than or equal to the second threshold, the current input voltage of the LED corresponding to the color identification is decreased, wherein the second threshold is greater than the first threshold.

3. The method according to claim 1, characterized in that The monitoring data is generated based on the monitored voltage of each channel and the color of the LED in each driving channel, including: The backlight driver chip determines the color of the LED in each drive channel; For each color of LED, the backlight driver chip determines a voltage state corresponding to the color of LED based on a channel voltage of a target drive channel, wherein the target drive channel includes the color of LED; The backlight driver chip uses the color identifier of the color and the voltage state corresponding to the LED of the color as a set of sub-monitoring data; The backlight driving chip uses each group of sub-monitoring data as the monitoring data; The step of adjusting, for each color LED, a current input voltage of the color LED to a target input voltage based on the monitoring data includes: For each color of LED, the backlight controller determines, from the monitoring data, a plurality of voltage states corresponding to the color identifier of the color; If the backlight controller determines that there is a low voltage state among the multiple voltage states, it will increase the current voltage of the LED of the color; if it determines that there is no low voltage state among the multiple voltage states and there is a high voltage state, it will decrease the current voltage of the LED of the color.

4. The method according to claim 3, characterized in that For each color of LED, the backlight driver chip determines the voltage state corresponding to the color of LED based on the channel voltage of the target drive channel, including: Among the channel voltages of the target driving channels, the backlight driving chip determines that there is a channel voltage less than a first threshold, and then determines that the voltage state corresponding to the LED of the color is a low voltage state; among the channel voltages of the target driving channels, the backlight driving chip determines that all channel voltages are greater than or equal to the first threshold, and there is a channel voltage greater than or equal to a second threshold, and then determines that the voltage state corresponding to the LED of the color is a high voltage state, wherein the first threshold is less than the second threshold.

5. The method according to any one of claims 1 to 4, characterized in that: After controlling the brightness of the LEDs in each driving channel, the method further includes: Determining relevant working data of the backlight driver chip, placing the relevant working data in the monitoring data, and after the backlight controller receives the monitoring data, performing corresponding operations based on the relevant working data in the monitoring data; Among them, the relevant working data includes part or all of the following: open circuit state data of each LED in each driving channel of the backlight driver chip, short circuit state data of each LED in each driving channel of the backlight driver chip, fault state data of the backlight driver chip, temperature data of the backlight driver chip, and input and output circuit breaker data of the backlight driver chip.

6. The method according to claim 5, characterized in that The method further comprises: The address data corresponding to the backlight driver chip is placed in the monitoring data. After receiving the monitoring data, the backlight controller determines the target backlight driver chip based on the address data in the monitoring data, and performs corresponding operations on the target backlight driver chip based on the relevant working data in the monitoring data.

7. A backlight driver chip, characterized in that: Applied to a backlight module, the backlight module includes a backlight controller and multiple backlight driver chips, the backlight driver chips include: Input terminal, used to input display data or output monitoring data; An output terminal, used for outputting the display data or inputting the monitoring data; An input / output module, configured to send the display data inputted from the input end to the logic module and the output end, or to send the monitoring data to the input end; The logic module is configured to receive the display data and determine target brightness data corresponding to the backlight driver chip from the display data; a driving module, configured to electrically connect to a plurality of LEDs via M driving channels and control the brightness of the plurality of LEDs based on the target brightness data, wherein the plurality of LEDs include LEDs of N colors, N being a positive integer greater than 1, and M being greater than or equal to N; monitor a channel voltage of each driving channel; and transmit the monitored channel voltage to a feedback function module; The feedback function module is used to generate the monitoring data based on the monitored voltage of each channel and the color of the LED in each driving channel; and send the monitoring data to the input and output module; After receiving the monitoring data, the backlight controller adjusts the current input voltage of each color LED to the target input voltage based on the monitoring data.

8. The chip according to claim 7, characterized in that The feedback function module is specifically used for: For each driving channel, determining a color identifier corresponding to the color of the LED in the driving channel, and using the color identifier and the driving voltage of the driving channel as a set of sub-monitoring data; Using each sub-monitoring data as the monitoring data; For each color of LED, the backlight controller determines multiple channel voltages corresponding to the color identification of the color from the monitoring data. When determining that among the multiple channel voltages, there is a channel voltage less than a first threshold, the current input voltage of the LED corresponding to the color identification is increased. When determining that among the multiple channel voltages, all channel voltages are greater than or equal to the first threshold, and there is a channel voltage greater than or equal to the second threshold, the current input voltage of the LED corresponding to the color identification is decreased, wherein the second threshold is greater than the first threshold.

9. The chip according to claim 7, characterized in that The feedback function module is specifically used for: Determining the color of an LED in each driving channel; for each color LED, determining a voltage state corresponding to the color LED based on a channel voltage of a target driving channel, wherein the target driving channel includes the color LED; using the color identifier of the color and the voltage state corresponding to the color LED as a set of sub-monitoring data; and using each set of sub-monitoring data as the monitoring data; For each color of LED, the backlight controller determines multiple voltage states corresponding to the color identification of the color from the monitoring data; if it is determined that a low voltage state exists among the multiple voltage states, the current voltage of the LED of the color is increased; if it is determined that a high voltage state exists and no low voltage state exists among the multiple voltage states, the current voltage of the LED of the color is decreased.

10. A backlight module, characterized in that: The invention comprises a backlight controller and a backlight driving chip as claimed in any one of claims 7 to 9.

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