Display device and backlight driving method

Abstract

The present application provides a display device and a backlight driving method. Among them, the display device includes a display control chip and a timing control chip, and a first signal transmission channel is provided between the display control chip and the timing control chip; the display device further includes a backlight driving chip, and a second signal transmission channel is provided between the backlight driving chip and the timing control chip. The display control chip is used to output backlight control information, and the backlight control information is output to the backlight driving chip through the first signal transmission channel, the timing control chip and the second signal transmission channel. The technical solution of the present application can reduce electromagnetic interference and ensure the normal operation of the display panel.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display device and a backlight driving method. Background Art

[0002] Currently, in a display panel, the lighting and turning off of a backlight module are controlled by PWM (Pulse Width Modulation signal). Since the PWM signal belongs to a frequency-varying modulation signal, electromagnetic interference will be generated during the transmission of the PWM signal, and the electromagnetic interference will affect the performance of the product itself and even cause some components to malfunction. Summary of the Invention

[0003] An object of this application is to provide a display device and a backlight driving method, which can effectively reduce electromagnetic interference and ensure the normal operation of the display panel.

[0004] According to one aspect of this application, this application provides a display device, which includes a display control chip and a timing control chip, and a first signal transmission channel is provided between the display control chip and the timing control chip;

[0005] The display device further includes a backlight driving chip, and a second signal transmission channel is provided between the backlight driving chip and the timing control chip;

[0006] Wherein, the display control chip is used to output backlight control information, the backlight control information is transmitted to the timing control chip through the first signal transmission channel, the timing control chip is used to convert the backlight control information into brightness adjustment data, and the brightness adjustment data is output to the backlight driving chip through the second signal transmission channel.

[0007] In one aspect, the first signal transmission channel is an AUX auxiliary transmission channel, and the second signal transmission channel is an I2C communication bus.

[0008] In one aspect, the display control chip includes a first differential pin and a second differential pin, the timing control chip includes a first auxiliary pin and a second auxiliary pin, the first signal transmission channel includes a first signal line and a second signal line, one end of the first signal line is connected to the first differential pin, and the other end is connected to the first auxiliary pin, and one end of the second signal line is connected to the second differential pin, and the other end is connected to the second auxiliary pin;

[0009] The timing control chip further includes a first data pin and a first clock pin, the backlight driving chip includes a second data pin and a second clock pin, the second signal transmission channel includes a first connection line and a second connection line, one end of the first connection line is connected to the first data pin, and the other end is connected to the second data pin, and one end of the second connection line is connected to the first clock pin, and the other end is connected to the second clock pin.

[0010] In one aspect, the display device further includes a capacitor, and the capacitor is disposed in the first signal transmission channel.

[0011] In addition, to solve the above problems, the present application further provides a backlight driving method, which is applied to the display device as described above, and the driving method includes:

[0012] Controlling the timing control chip to receive the backlight control information sent by the display control chip, and converting the backlight control information into brightness adjustment data;

[0013] Controlling the timing control chip to send the brightness adjustment data to the backlight driving chip.

[0014] In one aspect, before the step of controlling the timing control chip to receive the backlight control information sent by the display control chip, it includes:

[0015] Determining that the timing control chip supports the control of the backlight driving chip.

[0016] In one aspect, the step of determining that the timing control chip supports the control of the backlight driving chip includes:

[0017] Reading the configuration information of the timing control chip through the display control chip;

[0018] Comparing the configuration information with the pre-stored information, and when the configuration information conforms to the pre-stored information, determining that the timing control chip supports the control of the backlight driving chip.

[0019] In one aspect, the step of converting the backlight control information into brightness adjustment data includes:

[0020] Determining the support accuracy of the timing control chip for backlight brightness adjustment;

[0021] Controlling the display control chip to convert the backlight control information into brightness adjustment data according to the instruction of dividing the backlight brightness into 0% to 100% based on the support accuracy.

[0022] In one aspect, the step of controlling the timing control chip to send the brightness adjustment data to the backlight driving chip includes:

[0023] Controlling the timing control chip to store the brightness adjustment data in the configuration data register;

[0024] Extracting the brightness adjustment data and sending it to the backlight driving chip;

[0025] Controlling the backlight driving chip to feedback an acknowledgement to the timing control chip, and the timing control chip ends the data transmission to the backlight driving chip according to the feedback acknowledgement.

[0026] In one aspect, before the step of extracting the brightness adjustment data and sending it to the backlight driving chip, it includes:

[0027] Controlling the timing control chip to send a start instruction to the backlight driving chip and send the device address, wherein, upon receiving the device address, the backlight driving chip feedbacks a first acknowledgement signal to the timing control chip;

[0028] The timing control chip sends the address of the configuration data register storing the brightness adjustment data to the backlight driving chip according to the first acknowledgement signal, wherein, upon receiving the address of the configuration data register, the backlight driving chip feedbacks a second acknowledgement signal to the timing control chip;

[0029] The timing control chip extracts the brightness adjustment data and sends it to the backlight driving chip according to the second acknowledgement signal.

[0030] In the technical solution of the present application, the timing control chip transmits signals to the backlight driving chip through the second signal transmission channel. When it is necessary to make the backlight driving chip work, the display control chip sends backlight control information to the timing control chip through the first signal transmission channel. Then, taking the timing control chip as a transfer point, the backlight control information is converted into brightness adjustment data capable of driving the backlight driving chip to work, and the brightness adjustment data is sent to the backlight driving chip through the second signal transmission channel. It can be seen that the technical solution of the present application makes full use of the timing control chip, establishes a signal transmission channel between the timing control chip and the backlight driving chip, reduces the signal transmission in the PWM form, and then reduces the electromagnetic interference to ensure the normal operation of the display panel.

[0031] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. Description of the Drawings

[0032] The above and other objects, features, and advantages of the present application will become more apparent by describing its exemplary embodiments in detail with reference to the accompanying drawings.

[0033] Figure 1 It is a schematic structural diagram of the connection of functional components of a display device in the first embodiment of the present application.

[0034] Figure 2 In the present application Figure 1 It is a schematic diagram of the interface connection of a display control chip, a timing control chip, and a backlight driving chip.

[0035] Figure 3 It is a schematic diagram of the flow steps of a backlight driving method in the second embodiment of the present application.

[0036] Figure 4 In the present application Figure 3 It is a schematic diagram of the flow steps with step S30.

[0037] Figure 5 In the present application Figure 4 It is a schematic diagram of the flow steps of step S30.

[0038] Figure 6 In the present application Figure 3 It is a schematic diagram of the flow steps of step S001 and step S002.

[0039] Figure 7 In the present application Figure 3 It is a schematic diagram of the flow steps of step S10.

[0040] Figure 8 In the present application Figure 7 It is a schematic diagram of the flow steps of step S140, step S150, and step S160.

[0041] The description of the reference numerals is as follows:

[0042] 10, display control chip; 20, timing control chip; 30, backlight driving chip; 40, first signal transmission channel; 50, second signal transmission channel; 60, DC source; 70, source drive; 80, memory; 90, backlight.

[0043] C1, first capacitor; C2, second capacitor; 410, first signal line; 420, second signal line; 510, first connection line; 520, second connection line. Detailed implementation manners

[0044] Although the present application can be easily embodied in various forms of embodiments, only some specific embodiments are shown in the drawings and will be described in detail in this specification. At the same time, it can be understood that this specification should be regarded as a demonstration of the principles of the present application and is not intended to limit the present application to what is described herein.

[0045] Accordingly, a feature pointed out in this specification will be used to illustrate one of the features of an embodiment of the present application, rather than implying that each embodiment of the present application must have the feature described. In addition, it should be noted that this specification describes many features. Although certain features may be combined to show possible system designs, these features can also be used in other combinations not explicitly described. Accordingly, unless otherwise stated, the described combinations are not intended to be limiting.

[0046] In the embodiments shown in the drawings, the indication of directions (such as up, down, left, right, front and back) is used to explain that the structures and movements of various elements of the present application are not absolute but relative. When these elements are in the positions shown in the drawings, these descriptions are appropriate. If the description of the positions of these elements changes, then the indication of these directions also changes accordingly.

[0047] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that the description of the present application will be more complete and thorough, and will fully convey the concept of the example embodiments to those skilled in the art. The drawings are only schematic illustrations of the present application and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repeated description will be omitted.

[0048] The following further elaborates in detail the preferred embodiments of the present application in conjunction with the drawings of this specification.

[0049] Embodiment 1

[0050] The technical solution of the present application can be applied to display devices such as LCD (Liquid Crystal Display) that require a backlight module.

[0051] The display device of the present application includes a backlight module and a display panel. The backlight module is used to emit light, and the light is directed towards the display panel and passes through the display panel, so that the display panel can display images. Refer to Figure 1 and Figure 2As shown in the figure, the display device further includes a display control chip 10 and a timing control chip 20 (TCON, timing controller). A first signal transmission channel 40 is provided between the display control chip 10 and the timing control chip 20. The display control chip 10 is used to generate backlight control information for controlling the backlight module to light up. The display control chip 10 outputs the backlight control information, and the backlight control information is transmitted to the timing control chip 20 through the first signal transmission channel 40. The first signal transmission channel 40 can be understood as a pluggable patch cord or as a plated wiring formed by coating and etching.

[0052] The display device further includes a backlight driving chip 30. A second signal transmission channel 50 is provided between the backlight driving chip 30 and the timing control chip 20. The display control chip 10 is used to output backlight control information. The backlight control information passes through the timing control chip 20, and the timing control chip 20 is used to convert the backlight control information into brightness adjustment data. The brightness adjustment data is output to the backlight driving chip 30 through the second signal transmission channel 50.

[0053] It can be seen from this that in this embodiment, the signal for the backlight driving chip 30 to drive the backlight module to light up comes from the timing control chip 20. The timing control chip 20 sends the information for driving the backlight driving chip 30 to light up or turn off in the backlight control information to the backlight driving chip 30, that is, converts the information for driving the backlight driving chip 30 to light up or turn off in the backlight control information into brightness adjustment data.

[0054] In addition, this embodiment makes full use of the second signal transmission channel 50, reduces the setting of the EN line, and simplifies the structure of the display panel.

[0055] The second signal transmission channel 50 can also be understood as a pluggable patch cord or as a plated wiring formed by coating and etching. It can also be understood that part of the transmission channel is a patch cord and the other part is a plated wiring.

[0056] In the technical solution of this embodiment, the timing control chip 20 transmits signals to the backlight driving chip 30 through the second signal transmission channel 50. When it is necessary to make the backlight driving chip 30 work, the display control chip 10 sends backlight control information to the timing control chip 20 through the first signal transmission channel 40. Then, taking the timing control chip 20 as a transfer point, the backlight control information is converted into brightness adjustment data capable of driving the backlight driving chip 30 to work, and the brightness adjustment data is sent to the backlight driving chip 30 through the second signal transmission channel 50. It can be seen from this that the technical solution of this application makes full use of the timing control chip 20, establishes a signal transmission channel between the timing control chip 20 and the backlight driving chip 30, reduces the signal transmission in the PWM form, and then reduces electromagnetic interference to ensure the normal operation of the display panel.

[0057] In one aspect, the first signal transmission channel 40 is an AUX (Auxiliary) auxiliary transmission channel, and the second signal transmission channel 50 is an I2C (Inter-Integrated Circuit) communication bus, also known as an integrated circuit bus. The display control chip 10 transmits data through the eDP (Embedded Display Port) channel, and the AUX auxiliary transmission channel belongs to the transmission channels in the eDP channel.

[0058] It should be noted that the display device further includes a DC power source 60. The display control chip 10 is used to provide power for the DC power source 60. The DC power source 60 converts the power into a direct current and transmits it to the timing control chip 20 for the timing control chip 20 to work. At the same time, the DC power source 60 also provides power support for the source driver 70. The timing control chip 20 is connected to the source driver 70, and the timing control chip 20 is also used to control the turning on or off of the source driver 70. The timing control chip 20 is also connected to the memory 80 through the I2C communication bus, and the memory 80 is used to store the control instructions for the timing control chip 20. Among them, the I2C communication bus connected to the memory 80 and the I2C communication bus connected to the backlight driver chip 30 can be the same one or two different communication buses.

[0059] The eDP interface is a fully digital interface based on the Display Port architecture and protocol. The eDP interface can transmit high-resolution signals with a simpler connector and fewer pins, and can achieve simultaneous transmission of multiple data with a relatively high transmission rate. At the same time, the eDP interface has less EMI (electromagnetic interference).

[0060] The I2C communication bus is a serial communication bus that uses a multi-master and slave architecture, which facilitates communication between the main board and peripheral device components. The display control chip 10 transmits backlight control information to the timing control chip 20, and the timing control chip 20 transmits the backlight control information to the backlight driver chip 30 through the I2C communication bus. The backlight driver chip 30 lights up the backlight 90 through the backlight socket connector.

[0061] The first signal transmission channel 40 is used to transmit an AC differential signal. The AC differential signal uses differential transmission technology, which is different from the traditional method of one signal line and one ground line. In differential transmission, signals are transmitted on both of these two lines. The amplitudes of these two signals are the same and the phases are opposite. The signals transmitted on these two lines are differential signals. The signal receiving end compares the difference between these two voltages to determine the logic state transmitted by the sending end. On the circuit board, the differential traces must be of equal length, equal width, closely spaced, and two lines on the same layer.

[0062] Thus, the display control chip 10 includes a first differential pin and a second differential pin, the timing control chip 20 includes a first auxiliary pin and a second auxiliary pin, the first signal transmission channel 40 includes a first signal line 410 and a second signal line 420. One end of the first signal line 410 is connected to the first differential pin, and the other end is connected to the first auxiliary pin. One end of the second signal line 420 is connected to the second differential pin, and the other end is connected to the second auxiliary pin. The first signal line 410 and the second signal line 420 are used to transmit AC differential signals with opposite phases.

[0063] The timing control chip 20 further includes a first data pin and a first clock pin, the backlight driving chip 30 includes a second data pin and a second clock pin, the second signal transmission channel 50 includes a first connection line 510 and a second connection line 520. One end of the first connection line 510 is connected to the first data pin, and the other end is connected to the second data pin. One end of the second connection line 520 is connected to the first clock pin, and the other end is connected to the second clock pin. The first connection line 510 is used to transmit data signals, and the second connection line 520 is used to output clock signals.

[0064] Further, the first differential pin is the eDP_AUXP0 pin, the second differential pin is the eDP_AUXN0 pin, the first auxiliary pin is the AUX0P pin, the second auxiliary pin is the AUX0N pin. One end of the first signal line 410 is connected to the eDP_AUXP0 pin, and the other end is connected to the AUX0P pin. One end of the second signal line 420 is connected to the eDP_AUXN0 pin, and the other end is connected to the AUX0N pin. The backlight control information passes through the first signal line 410 and is transmitted from the eDP_AUXP0 pin of the timing control chip 20 to the AUX0P pin of the timing control chip 20. At the same time, the backlight control information passes through the second signal line 420 and is transmitted from the eDP_AUXN0 pin of the timing control chip 20 to the AUX0N pin of the timing control chip 20.

[0065] The first data pin is the MSDA pin, the first clock pin is the MSCL pin, the second data pin is the SDA pin, and the second clock pin is the SCL pin. One end of the first connection line 510 is connected to the MSDA pin, and the other end is connected to the SDA pin. One end of the second connection line 520 is connected to the MSCL pin, and the other end is connected to the SCL pin. The brightness adjustment data passes through the first connection line 510 and is transmitted from the MSDA pin of the timing control chip 20 to the SDA pin of the backlight driving chip 30. At the same time, the brightness adjustment data passes through the second connection line 520 and is transmitted from the MSCL pin of the timing control chip 20 to the SCL pin of the backlight driving chip 30.

[0066] Among them, the SCL (serial clock) clock line and the SDA (serial data) data line, and the bus composed of SCL and SDA together form the I2C communication bus.

[0067] In addition, the backlight control information is transmitted in the form of an alternating current. The content of the backlight control information is reflected by the waveform change of the alternating current. For example, the peak of the alternating current represents 1, and the trough of the alternating current represents 0. However, during the data transmission process, there is likely to be a direct current. If the direct current is transmitted along with the alternating current, it is likely to affect the accuracy of the backlight control information.

[0068] Therefore, the display device further includes a capacitor, which is disposed in the first signal transmission channel 40. The capacitor can conduct alternating current and block direct current. Thus, through the setting of the capacitor, it can ensure the smooth transmission of the alternating current, block the direct current, and avoid the direct current affecting the content accuracy of the backlight control information.

[0069] Specifically, the capacitor includes a first capacitor C1 and a second capacitor C2. The first capacitor C1 can be set in the first signal line 410, and the second capacitor C2 can be set in the second signal line 420. By setting capacitors in both signal lines, it can further improve the accuracy of the content of the backlight control information.

[0070] Embodiment 2

[0071] Refer to Figure 3 As shown, the present application further provides a backlight driving method, which is applied to the display device as described above. The driving method includes:

[0072] Step S10, controlling the timing control chip 20 to receive the backlight control information sent by the display control chip 10 and convert the backlight control information into brightness adjustment data; the backlight control information includes driving instructions for driving the backlight driving chip 30 to work. Extract these driving instructions, transform them to adapt to the form and requirements of the timing control chip 20, and convert them into brightness adjustment data. Among them, the display control chip 10 transmits the backlight control information to the timing control chip 20 through the first signal transmission channel 40.

[0073] Step S20, controlling the timing control chip 20 to send the brightness adjustment data to the backlight driving chip 30. Among them, the timing control chip 20 sends the brightness adjustment data to the backlight driving chip 30 through the second signal transmission channel 50. The backlight driving chip 30 is connected to the backlight source 90. According to the brightness adjustment data, the backlight driving chip 30 adjusts the brightness of the backlight source 90.

[0074] In the technical solution of this embodiment, the timing control chip 20 transmits signals to the backlight driving chip 30 through the second signal transmission channel 50. When it is necessary to make the backlight driving chip 30 work, the display control chip 10 sends backlight control information to the timing control chip 20 through the first signal transmission channel 40. After receiving the backlight control information, the timing control chip 20 converts the backlight control information into brightness adjustment data capable of driving the backlight driving chip 30 to work. Then, the brightness adjustment data is sent to the backlight driving chip 30 through the second signal transmission channel 50. It can be seen that a signal transmission channel is established between the timing control chip 20 and the backlight driving chip 30, reducing the signal transmission in the form of PWM, thereby reducing electromagnetic interference and ensuring the normal operation of the display panel.

[0075] Referring to Figure 4 As shown, in order to ensure that the timing control chip 20 can effectively execute the command transfer to the backlight driving chip 30, before the step of controlling the timing control chip 20 to receive the backlight control information sent by the display control chip 10, it includes:

[0076] Step S30, determining that the timing control chip 20 supports the control of the backlight driving chip 30. That is, before using the timing control chip 20 to transmit information to the backlight driving chip 30, it is judged whether the timing control chip 20 supports the control of the backlight driving chip 30. If it does not support, or the signal transmission channel is occupied, the control of the backlight driving chip 30 cannot be performed temporarily. Otherwise, data chaos is likely to occur. Therefore, after determining that the timing control chip 20 supports the control of the backlight driving chip 30, the backlight control information is transmitted.

[0077] Referring to Figure 5 As shown, the step of determining that the timing control chip 20 supports the control of the backlight driving chip 30 includes:

[0078] Step S310, reading the configuration information of the timing control chip 20 through the display control chip 10; wherein, the configuration information includes the data code stored in the configuration data register, and the content represented by the data code indicates whether the timing control chip 20 supports the control of the backlight driving chip 30. Read the data code of the configuration data register in the timing control chip 20 through the display control chip 10; and then judge whether it supports according to the data code.

[0079] Step S320: Compare the configuration information with the pre-stored information. When the configuration information conforms to the pre-stored information, it is determined that the timing control chip 20 supports the control of the backlight driving chip 30. The pre-stored information includes pre-stored codes. Compare the data code with the pre-stored code. The pre-stored code can be stored in the display control chip 10 or in the timing control chip 20. When the data code conforms to the pre-stored code, it is determined that the timing control chip 20 supports the control of the backlight driving chip 30. The data code conforming to the pre-stored code can mean that the data code is equal to the pre-stored code, or it can be understood that the pre-stored code is a range value and the data code is within this range.

[0080] Refer to Figure 6 As shown, the steps of converting the backlight control information into brightness adjustment data include:

[0081] Step S001: Determine the support precision of the timing control chip 20 for backlight brightness adjustment; the support precision can be understood as the fineness of backlight brightness adjustment. For example, if the support precision is high, the backlight brightness adjustment is more precise; if the support precision is low, the span of backlight brightness adjustment is larger.

[0082] Step S002: According to the support precision, control the display control chip 10 to divide the instructions according to the backlight brightness in the range of 0% to 100%, and convert the backlight control information into brightness adjustment data. The support precision can be represented by the data capacity. For example, if there are 100 codes stored in the timing control chip 20 to represent the backlight brightness, then 0 represents 0% brightness, 1 represents 1% brightness, and so on, until 100 represents 100% brightness.

[0083] Dividing the backlight brightness according to the support precision can make full use of the performance of the timing control chip 20. At the same time, using different codes to represent different backlight brightness levels enables different backlight brightness levels to have different representations, which is beneficial to accurate brightness adjustment.

[0084] Refer to Figure 7 As shown, the steps of controlling the timing control chip 20 to send the brightness adjustment data to the backlight driving chip 30 include:

[0085] Step S110: Control the timing control chip 20 to save the brightness adjustment data in the configuration data register; after the backlight control information is converted into brightness adjustment data, these brightness adjustment data are saved, and when the backlight source 90 needs to be lit, the brightness adjustment data are sequentially extracted according to the time sequence.

[0086] Step S120: Extract the brightness adjustment data and send it to the backlight driving chip 30; the extraction of the brightness adjustment data can be sequential extraction according to the time sequence, or all the brightness adjustment data can be taken out at once.

[0087] Step S130: Control the backlight driving chip 30 to feedback an acknowledgement to the timing control chip 20, and the timing control chip 20 ends the data transmission to the backlight driving chip 30 based on the feedback acknowledgement. After the backlight driving chip 30 receives the brightness adjustment data, it needs to notify the timing control chip 20 that the data reception is completed. At this time, the backlight driving chip 30 actively feeds back a feedback acknowledgement signal to the timing control chip 20 to notify the timing control chip 20 that the data reception has been completed. After the timing control chip 20 receives the feedback acknowledgement, it ends the data transmission to the backlight driving chip 30. Through the above steps, the transmission of the brightness adjustment data is successfully completed.

[0088] In addition, refer to Figure 8 As shown, before transmitting the brightness adjustment data to the backlight driving chip 30 for adjustment, it is necessary to determine the storage location of the brightness adjustment data. Before the steps of extracting the brightness adjustment data and sending it to the backlight driving chip 30, it includes:

[0089] Step S140: Control the timing control chip 20 to send a start instruction to the backlight driving chip 30 and send the device address. Among them, after the backlight driving chip 30 receives the device address, it feeds back a first acknowledgement signal to the timing control chip 20; the device address can be understood as the I2C device address. After the backlight driving chip 30 receives the correct device address, it notifies the timing control chip 20 and feeds back a first acknowledgement signal to the timing control chip 20. After the timing control chip 20 receives the first acknowledgement signal, it is convenient to perform subsequent transmission actions.

[0090] Step S150: The timing control chip 20 sends the address of the configuration data register for storing the brightness adjustment data to the backlight driving chip 30 based on the first acknowledgement signal. Among them, after the backlight driving chip 30 receives the address of the configuration data register, it feeds back a second acknowledgement signal to the timing control chip 20; here, the address of the configuration data register represents the storage location of the brightness adjustment data. Similarly, after the backlight driving chip 30 receives the address of the configuration data register, it notifies the timing control chip 20 that the data is accurate and feeds back a second acknowledgement signal to the timing control chip 20. After the timing control chip 20 receives the second acknowledgement signal, it is convenient to perform subsequent transmission actions. The feedback acknowledgement, the first acknowledgement signal, and the second acknowledgement signal can all be responded and fed back with the ACK bit being 0. ACK is the abbreviation of Acknowledge character, that is, the acknowledgement character. In data communication, it is a type of transmission control character sent by the receiving station to the sending station. It indicates that the data sent has been confirmed to be received correctly.

[0091] Step S160: The timing control chip 20 extracts the brightness adjustment data according to the second response signal and sends it to the backlight driving chip 30. After determining the storage address of the brightness adjustment data, the brightness adjustment data is extracted and sent to the backlight driving chip 30, enabling the backlight driving chip 30 to complete the driving of the backlight 90.

[0092] To clearly illustrate the step process of the backlight driving method in this embodiment, the following is an example for further explanation: The display control chip 10 reads the configuration information of the timing control chip 20 through the AUX auxiliary transmission channel of the eDP channel. When it reads that bit0 is 1, bit1 is 0, and bit2 is 1 in the address 0x00701 of the configuration data register (DPCD), that is, when it is 101, it is determined that the timing control chip 20 supports controlling the backlight driving chip 30 through the AUX auxiliary transmission channel.

[0093] When the display control chip 10 reads that bit0 is 0, bit1 is 1, and bit2 is 0 in the address 0x00702 of the configuration data register, that is, when it is 010, the timing control chip 20 supports the 1-byte support precision for the backlight brightness. At this time, the display control chip 10 writes the code 0x0000 to the address 00722h of the configuration data register of the timing control chip 20 through the AUX auxiliary transmission channel. 0x0000 represents setting the backlight brightness to 0%, that is, turning off the backlight 90 and the display is black. The code value can also be increased until 0x00FF represents that the brightness reaches 100%.

[0094] When the timing control chip 20 transmits the brightness adjustment data to the backlight driving chip 30, it sends a start instruction to the backlight control chip through the internal I2C communication bus, and then sends the I2C device address and a write bit, such as: 0x92. After the backlight control chip receives the correct I2C device address with the write bit, it feeds back the first response signal, that is, it responds with the ACK bit 0. The timing control chip 20 then sends the address of the configuration data register to be written through the I2C communication bus, such as: 0x04. After the backlight control chip receives the address of the configuration data register to be accessed, it feeds back with the second response signal, that is, it responds again with the ACK bit 0. The timing control chip 20 then sends the brightness adjustment data corresponding to the address of the configuration data register through the I2C communication bus, such as: 0Xa5. After the backlight control chip receives the brightness adjustment data, it feeds back with the response signal, that is, it responds again with the ACK bit 0. The timing control chip 20 then sends an end (stop) condition through the I2C communication bus to end the entire single-byte write operation. At this time, the backlight 90 completes the turn-on operation.

[0095] While the present application has been described with reference to several exemplary embodiments, it should be understood that the terms used are descriptive and exemplary rather than restrictive. Since the present application can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above-described embodiments are not limited to any of the foregoing details, but rather should be broadly construed within the spirit and scope defined by the appended claims, and thus all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A display device, the display device includes a display control chip and a timing control chip, and a first signal transmission channel is provided between the display control chip and the timing control chip; It is characterized in that The display device further includes a backlight driving chip, and a second signal transmission channel is provided between the backlight driving chip and the timing control chip; Wherein, the display control chip is configured to output backlight control information after determining that the timing control chip supports the control of the backlight driving chip, the backlight control information is transmitted to the timing control chip through the first signal transmission channel, and the timing control chip is configured to determine the support accuracy of the timing control chip for backlight brightness adjustment, and control the display control chip to convert the backlight control information into brightness adjustment data according to the condition that the backlight brightness is divided into instructions from 0% to 100%, and the brightness adjustment data is output to the backlight driving chip through the second signal transmission channel.

2. The display device according to claim 1, characterized in that, The first signal transmission channel is an AUX auxiliary transmission channel, and the second signal transmission channel is an I2C communication bus.

3. The display device according to claim 2, characterized in that, The display control chip includes a first differential pin and a second differential pin, the timing control chip includes a first auxiliary pin and a second auxiliary pin, the first signal transmission channel includes a first signal line and a second signal line, one end of the first signal line is connected to the first differential pin, and the other end is connected to the first auxiliary pin, and one end of the second signal line is connected to the second differential pin, and the other end is connected to the second auxiliary pin; The timing control chip further includes a first data pin and a first clock pin, the backlight driving chip includes a second data pin and a second clock pin, the second signal transmission channel includes a first connection line and a second connection line, one end of the first connection line is connected to the first data pin, and the other end is connected to the second data pin, and one end of the second connection line is connected to the first clock pin, and the other end is connected to the second clock pin.

4. The display device according to any one of claims 1 to 3, characterized in that, The display device further includes a capacitor, and the capacitor is arranged in the first signal transmission channel.

5. A backlight driving method, characterized in that, The driving method is applied to the display device according to claim 1, and the driving method includes: Determine that the timing control chip supports the control of the backlight driving chip; Control the timing control chip to receive the backlight control information sent by the display control chip; Determine the support accuracy of the timing control chip for backlight brightness adjustment; Control the display control chip to divide the instructions according to the backlight brightness from 0% to 100% according to the support accuracy, so as to control the timing control chip to convert the backlight control information into brightness adjustment data; Control the timing control chip to send the brightness adjustment data to the backlight driving chip.

6. The backlight driving method according to claim 5, wherein The step of determining that the timing control chip supports the control of the backlight driving chip includes: Read the configuration information of the timing control chip through the display control chip; Compare the configuration information with the pre-stored information, and when the configuration information conforms to the pre-stored information, determine that the timing control chip supports the control of the backlight driving chip.

7. The backlight driving method according to claim 5, wherein The steps of controlling the timing control chip to send the brightness adjustment data to the backlight driving chip include: Controlling the timing control chip to save the brightness adjustment data in the configuration data register; Extracting the brightness adjustment data and sending it to the backlight driving chip; Controlling the backlight driving chip to feedback an acknowledgement to the timing control chip, and the timing control chip ends the data transmission to the backlight driving chip according to the feedback acknowledgement.

8. The backlight driving method according to claim 7, wherein Before the step of extracting the brightness adjustment data and sending it to the backlight driving chip, it includes: Controlling the timing control chip to send a start instruction to the backlight driving chip and send a device address, wherein, after receiving the device address, the backlight driving chip feedbacks a first acknowledgement signal to the timing control chip; The timing control chip sends the address of the configuration data register storing the brightness adjustment data to the backlight driving chip according to the first acknowledgement signal, wherein, after receiving the address of the configuration data register, the backlight driving chip feedbacks a second acknowledgement signal to the timing control chip; The timing control chip executes the step of extracting the brightness adjustment data and sending it to the backlight driving chip according to the second acknowledgement signal.

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