CN115620683A - Display device and backlight driving method - Google Patents
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- CN115620683A CN115620683A CN202211314807.3A CN202211314807A CN115620683A CN 115620683 A CN115620683 A CN 115620683A CN 202211314807 A CN202211314807 A CN 202211314807A CN 115620683 A CN115620683 A CN 115620683A
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- 238000004891 communication Methods 0.000 claims description 16
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/06—Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
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Abstract
The application provides a display device and a backlight driving method. The display device comprises a display control chip and a time sequence control chip, wherein a first signal transmission channel is arranged between the display control chip and the time sequence control chip; the display device further comprises a backlight driving chip, a second signal transmission channel is arranged between the backlight driving chip and the time sequence control chip, the display control chip is used for outputting backlight control information, and the backlight control information is output to the backlight driving chip through the first signal transmission channel, the time sequence control chip and the second signal transmission channel. According to the technical scheme, the electromagnetic interference can be reduced, and the normal work of the display panel is guaranteed.
Description
Technical Field
The present disclosure relates to display technologies, and in particular, to a display device and a backlight driving method.
Background
At present, in a display panel, the on and off of the backlight module is controlled by a Pulse Width Modulation (PWM) signal. Because the PWM signal belongs to a frequency change modulation signal, electromagnetic interference can be generated in the transmission process of the PWM signal, and the electromagnetic interference can influence the performance of a product, even cause that part of components can not work normally.
Disclosure of Invention
An object of the present application is to provide a display device and a backlight driving method, which can effectively reduce electromagnetic interference and ensure normal operation of a display panel.
According to one aspect of the present application, a display device is provided, where the display device includes a display control chip and a timing control chip, and a first signal transmission channel is arranged between the display control chip and the timing control chip;
the display device also comprises a backlight driving chip, and a second signal transmission channel is arranged between the backlight driving chip and the time sequence control chip;
the display control chip is used for outputting backlight control information, the backlight control information is transmitted to the time sequence control chip through the first signal transmission channel, the time sequence control chip is used for converting the backlight control information into brightness adjusting data, and the brightness adjusting data is output to the backlight driving chip through the second signal transmission channel.
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.
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, the other end of the first signal line is connected to the first auxiliary pin, one end of the second signal line is connected to the second differential pin, and the other end of the second signal line is connected to the second auxiliary pin;
the timing control chip further comprises a first data pin and a first clock pin, the backlight driving chip comprises a second data pin and a second clock pin, the second signal transmission channel comprises a first connecting line and a second connecting line, one end of the first connecting line is connected with the first data pin, the other end of the first connecting line is connected with the second data pin, one end of the second connecting line is connected with the first clock pin, and the other end of the second connecting line is connected with the second clock pin.
In one aspect, the display device further includes a capacitor provided in the first signal transmission channel.
Further, in order to solve the above problem, the present application also provides a backlight driving method applied to the display device as described above, the driving method including:
controlling the time sequence control chip to receive backlight control information sent by the display control chip and converting the backlight control information into brightness adjustment data;
and controlling the time sequence control chip to send the brightness adjusting data to the backlight driving chip.
In one aspect, before the step of controlling the timing control chip to receive the backlight control information sent by the display control chip, the method includes:
determining that the timing control chip supports control of the backlight driving chip.
In one aspect, the step of determining that the timing control chip supports the control of the backlight driving chip includes:
reading the configuration information of the time sequence control chip through the display control chip;
and comparing the configuration information with pre-stored information, and judging that the timing control chip supports the control of the backlight driving chip when the configuration information accords with the pre-stored information.
In one aspect, the step of converting the backlight control information into brightness adjustment data includes:
determining the supporting precision of the time sequence control chip on backlight brightness adjustment;
and controlling the display control chip to divide the command according to the supporting precision, wherein the command is divided according to the backlight brightness of 0-100%, and the backlight control information is converted into brightness adjusting data.
In one aspect, the step of controlling the timing control chip to transmit the brightness adjustment data to the backlight driving chip includes:
controlling the time sequence control chip to store the brightness adjusting data in a configuration data register;
extracting the brightness adjusting data and sending the brightness adjusting data to the backlight driving chip;
and controlling the backlight driving chip to feed back a response to the time sequence control chip, and finishing data transmission to the backlight driving chip by the time sequence control chip according to the feedback response.
In one aspect, before the step of extracting and sending the brightness adjustment data to the backlight driving chip, the method includes:
controlling the time sequence control chip to send an initial instruction to the backlight driving chip and send an equipment address, wherein the backlight driving chip receives the equipment address and feeds a first response signal back to the time sequence control chip;
the time sequence control chip sends an address of a configuration data register for storing the brightness adjusting data to the backlight driving chip according to the first response signal, wherein the backlight driving chip feeds back a second response signal to the time sequence control chip after receiving the address of the configuration data register;
and the time sequence control chip extracts the brightness adjusting data according to the second response signal and sends the brightness adjusting data to the backlight driving chip.
In the technical scheme of this application, the timing control chip carries out signal transmission through second signal transmission channel drive chip in a poor light. When the backlight driving chip needs to work, the display control chip sends backlight control information to the time sequence control chip through the first signal transmission channel. And then, the time sequence control chip is taken as a transfer point, the backlight control information is converted into brightness adjusting data capable of driving the backlight driving chip to work, and the brightness adjusting data is sent to the backlight driving chip through a second signal transmission channel. Therefore, the technical scheme of the application makes full use of the time sequence control chip, establishes a signal transmission channel between the time sequence control chip and the backlight driving chip, reduces signal transmission in a PWM mode, reduces electromagnetic interference, and ensures normal work of the display panel.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The above and other objects, features and advantages of the present application will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 is a schematic structural view of functional part connection of a display device in a first embodiment in this application.
Fig. 2 is a schematic diagram of the interface connection between the display control chip, the timing control chip and the backlight driving chip in fig. 1.
Fig. 3 is a flowchart illustrating a backlight driving method according to a second embodiment of the present application.
Fig. 4 is a schematic view of the process steps with step S30 in fig. 3 of the present application.
Fig. 5 is a schematic flowchart of step S30 in fig. 4.
Fig. 6 is a schematic flow chart of steps S001 and S002 in fig. 3 in the present application.
Fig. 7 is a schematic flowchart of step S10 in fig. 3 in the present application.
Fig. 8 is a schematic diagram of the flow steps of step S140, step S150 and step S160 in fig. 7 in the present application.
The reference numerals are explained below:
10. a display control chip; 20. a time sequence control chip; 30. a backlight driving chip; 40. a first signal transmission channel; 50. a second signal transmission channel; 60. a direct current source; 70. driving a source electrode; 80. a memory; 90. a backlight source;
c1, a first capacitor; c2, a second capacitor; 410. a first signal line; 420. a second signal line; 510. a first connection line; 520. and a second connecting line.
Detailed Description
While this application is susceptible of embodiment in different forms, there is shown in the drawings and will herein be described in detail only some specific embodiments thereof with the understanding that the present disclosure is to be considered as an exemplification of the principles of the application and is not intended to limit the application to that as illustrated herein.
Thus, a feature indicated in this specification is intended to describe one of the features of an embodiment of the application and does not imply that every embodiment of the application must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.
In the embodiments shown in the drawings, directional references (such as up, down, left, right, front, and rear) are used to explain the structure and movement of the various elements of the present application not absolutely, but relatively. These illustrations are appropriate when the elements are in the positions shown in the figures. If the description of the positions of these elements changes, the indication of these directions changes accordingly.
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely 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 a repetitive description thereof will be omitted.
The preferred embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Example one
The technical scheme of the application can be applied to Display devices such as LCDs (Liquid Crystal displays) and the like which need backlight modules.
The display device comprises the backlight module and the display panel, wherein the backlight module is used for emitting light, the light emits to the display panel, and the light penetrates through the display panel, so that the display panel can display pictures. Referring to fig. 1 and 2, the display device further includes a display control chip 10 and a timing control chip 20 (TCON), and a first signal transmission channel 40 is disposed between the display control chip 10 and the timing control chip 20; the display control chip 10 is used for generating backlight control information for controlling the backlight module to be turned on. The display control chip 10 outputs 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 may be understood as a plug wire that can be plugged and unplugged, and may also be understood as a plated trace formed by plating etching.
The display device further comprises a backlight driving chip 30, a second signal transmission channel 50 is arranged between the backlight driving chip 30 and the timing control chip 20, the display control chip 10 is used for outputting backlight control information, the backlight control information passes through the timing control chip 20, the timing control chip 20 is used for converting the backlight control information into brightness adjusting data, and the brightness adjusting data is output to the backlight driving chip 30 through the second signal transmission channel 50.
Therefore, in the present embodiment, the signal for driving the backlight module to light by the backlight driving chip 30 comes from the timing control chip 20. The timing control chip 20 sends the information for driving the backlight driving chip 30 to turn on or turn off in the backlight control information to the backlight driving chip 30, that is, the information for driving the backlight driving chip 30 to turn on or turn off in the backlight control information is converted into the brightness adjustment data.
In addition, the second signal transmission channel 50 is fully utilized in the embodiment, the number of the EN lines is reduced, and the structure of the display panel is simplified.
The second signal transmission channel 50 may also be understood as a pluggable patch cord, and may also be understood as a plated trace formed by etching a plated film. It can also be understood that part of the transmission channel is a patch cord and the other part is a plated trace.
In the technical solution of the present embodiment, the timing control chip 20 performs signal transmission through the backlight driving chip 30 of the second signal transmission channel 50. When the backlight driving chip 30 needs to be operated, the display control chip 10 sends backlight control information to the timing control chip 20 through the first signal transmission channel 40. Then, the timing control chip 20 is used as a transit point to convert the backlight control information 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. Therefore, the technical scheme of the application makes full use of the time sequence control chip 20, and a signal transmission channel is established between the time sequence control chip 20 and the backlight driving chip 30, so that signal transmission in a PWM form is reduced, electromagnetic interference is reduced, and normal work of the display panel is ensured.
In one aspect, the first signaling path 40 is an AUX (AUX) Auxiliary signaling path and the second signaling path 50 is an I2C (Inter-Integrated Circuit) communication bus, also referred to as an Integrated Circuit bus. The Display control chip 10 transmits data through an eDP (Embedded Display Port) channel, and the AUX auxiliary transmission channel belongs to a transmission channel in the eDP channel.
It should be noted that the display device further includes a dc source 60, the display control chip 10 is configured to provide power for the dc source 60, and the dc source 60 converts the power into a dc current and transmits the dc current to the timing control chip 20, so as to enable the timing control chip 20 to operate. While the dc source 60 also provides power support to the source driver 70. The timing control chip 20 is connected to the source driver 70, and the timing control chip 20 is further used for controlling the source driver 70 to be turned on or off. The timing control chip 20 is also connected to a memory 80 through an I2C communication bus, and the memory 80 is used for storing control instructions for the timing control chip 20. The I2C communication bus connected to the memory 80 and the I2C communication bus connected to the backlight driving chip 30 may be the same bus or two different communication buses.
The eDP interface is a fully digital interface based on Display interface (Display Port) architecture and protocol. The eDP interface can use a simpler connector and fewer pins to transmit high-resolution signals, can realize simultaneous transmission of multiple data, and has a higher transmission rate. While the eDP interface has less EMI (electromagnetic interference).
The I2C communication bus is a serial communication bus, and a multi-master-slave architecture is used, so that the communication between a mainboard and peripheral equipment components is facilitated. The display control chip 10 transmits the backlight control information to the timing control chip 20, the timing control chip 20 transmits the backlight control information to the backlight driving chip 30 through the I2C communication bus, and the backlight driving chip 30 lights the backlight source 90 through the backlight socket connector.
The first signal transmission channel 40 is used for transmitting an ac differential signal, and the ac differential signal utilizes a differential transmission technology, which is different from the traditional method of one signal line and one ground line, and the differential transmission transmits signals on the two lines, and the two signals have the same amplitude and opposite phases. The signals transmitted on these two lines are differential signals. The signal receiving end compares the difference value of the two voltages to judge the logic state sent by the sending end. On a circuit board, the differential traces must be two lines that are equal in length, equal in width, closely adjacent, and on the same plane.
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, 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.
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, 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 for transmitting a data signal, and the second connection line 520 is used for outputting a clock signal.
Further, the first differential pin is an eDP _ AUXP0 pin, the second differential pin is an eDP _ AUXN0 pin, the first auxiliary pin is an AUX0P pin, the second auxiliary pin is an AUX0N pin, one end of the first signal line 410 is connected to the eDP _ AUXP0 pin, the other end of the first signal line 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 of the second signal line is connected to the AUX0N pin; the backlight control information is transmitted to the AUX0P pin of the timing control chip 20 from the eDP _ AUXP0 pin of the timing control chip 20 through the first signal line 410; meanwhile, the backlight control information is transmitted from the eDP _ AUXN0 pin of the timing control chip 20 to the AUX0N pin of the timing control chip 20 through the second signal line 420.
The first data pin is an MSDA pin, the first clock pin is an MSCL pin, the second data pin is an SDA pin, and the second clock pin is an 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, and 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 is transmitted from the MSDA pin of the timing control chip 20 to the SDA pin of the backlight driving chip 30 via the first connection line 510; meanwhile, the brightness adjustment data is transmitted from the MSCL pin of the timing control chip 20 to the SCL pin of the backlight driving chip 30 through the second connection line 520.
Wherein, the SCL (serial clock) clock line and the SDA (serial data) data line, and the bus formed by the SCL and the SDA together forms an I2C communication bus.
In addition, the backlight control information is propagated in the form of alternating current. The content of the backlight control information is embodied by the waveform change of the alternating current. For example, the peak of the alternating current represents 1, and the valley of the alternating current represents 0. However, in the process of transmitting data, direct current is easy to exist, and if the direct current is transmitted along with the alternating current, the accuracy of backlight control information is easily influenced.
To this end, the display device further includes a capacitor provided in the first signal transmission path 40. The capacitor can be connected with alternating current and direct current. Therefore, through the arrangement of the capacitor, the alternating current can be ensured to be transmitted smoothly, the direct current is blocked, and the influence of the direct current on the content accuracy of the backlight control information is avoided.
Specifically, the capacitor includes a first capacitance C1 and a second capacitance C2, the first capacitance C1 may be disposed in the first signal line 410, and the second capacitance C2 may be disposed in the second signal line 420. And capacitors are arranged in the two signal lines, so that the accuracy of the backlight control information content can be further improved.
Example two
Referring to fig. 3, the present application further provides a backlight driving method, which is applied to the display device, and the driving method includes:
step S10, the control time sequence control chip 20 receives the backlight control information sent by the display control chip 10 and converts the backlight control information into brightness adjustment data; the backlight control information includes driving instructions for driving the backlight driving chip 30 to operate, and the driving instructions are extracted and converted to adapt to the form and requirements of the timing control chip 20, and are converted into brightness adjustment data. Wherein, the display control chip 10 transmits the backlight control information to the timing control chip 20 through the first signal transmission channel 40.
In step S20, the timing control chip 20 is controlled to send the brightness adjustment data to the backlight driving chip 30. Wherein, 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 90, and the backlight driving chip 30 adjusts the brightness of the backlight 90 according to the brightness adjustment data.
In the technical solution of the present embodiment, the timing control chip 20 performs signal transmission through the backlight driving chip 30 of the second signal transmission channel 50. When the backlight driving chip 30 needs to be operated, 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 operate. The brightness adjustment data is sent to the backlight driving chip 30 through the second signal transmission channel 50. Therefore, a signal transmission channel is established between the timing control chip 20 and the backlight driving chip 30, so that signal transmission in a PWM form is reduced, and then electromagnetic interference is reduced, thereby ensuring normal operation of the display panel.
Referring to fig. 4, in order to ensure that the timing control chip 20 can effectively execute the command forwarding to the backlight driving chip 30, the step of controlling the timing control chip 20 to receive the backlight control information sent by the display control chip 10 includes:
in step S30, it is determined that the timing control chip 20 supports the control of the backlight driving chip 30. It is determined whether the timing control chip 20 supports the control of the backlight driving chip 30 before the timing control chip 20 is used to transmit information to the backlight driving chip 30. If not supported, or if the signal transmission channel is occupied, the control of the backlight driving chip 30 is temporarily disabled. Otherwise, data confusion is easily caused. Therefore, after it is determined that the timing control chip 20 supports the control of the backlight driving chip 30, the transmission of the backlight control information is performed.
Referring to fig. 5, the step of determining that the timing control chip 20 supports the control of the backlight driving chip 30 includes:
step S310, reading the configuration information of the time sequence control chip 20 through the display control chip 10; the configuration information includes a 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. Reading a data code of a configuration data register in the timing control chip 20 through the display control chip 10; whether the support is carried out or not is judged according to the data codes.
Step S320, comparing the configuration information with the pre-stored information, and determining that the timing control chip 20 supports the control of the backlight driving chip 30 when the configuration information matches the pre-stored information. The pre-stored information comprises pre-stored codes; the data code is compared with a pre-stored code, and the pre-stored code can be stored in the display control chip 10 and can be stored in the timing control chip 20. When the data code corresponds to the pre-stored code, the timing control chip 20 is determined to support the control of the backlight driving chip 30. The data code corresponds to the pre-stored code, which may be the data code being equal to the pre-stored code, or it may be understood that the pre-stored code is a range of values, within which the data code is within.
Referring to fig. 6, the step of converting the backlight control information into the brightness adjustment data includes:
step S001, determining the supporting precision of the sequential control chip 20 for backlight brightness adjustment; the support accuracy can be understood as the degree of fineness of the backlight brightness adjustment. For example, if the support accuracy is high, the backlight luminance is adjusted more finely, and if the support accuracy is low, the span of the backlight luminance adjustment is larger.
Step S002, the display control chip 10 is controlled according to the support accuracy to divide the command according to the backlight brightness of 0% to 100%, and the backlight control information is converted into brightness adjustment data. The support accuracy can be expressed by data capacity, for example, if there are 100 codes stored in the timing control chip 20 to represent the backlight brightness, 0% brightness is represented by 0, 1 by 1% brightness, and so on until 100 represents 100% brightness.
The division of the backlight luminance according to the support accuracy enables the performance of the timing control chip 20 to be fully utilized. Meanwhile, different codes are used for representing different backlight brightness, so that different backlight brightness can be represented differently, and accurate adjustment of brightness is facilitated.
Referring to fig. 7, the step of controlling the timing control chip 20 to send the brightness adjustment data to the backlight driving chip 30 includes:
step S110, controlling the timing control chip 20 to store the brightness adjustment data in the configuration data register; after the backlight control information is converted into the brightness adjustment data, the brightness adjustment data is stored, and when the backlight 90 needs to be lit, the brightness adjustment data is sequentially extracted in time order.
Step S120, extracting the brightness adjustment data, and sending the brightness adjustment data to the backlight driver chip 30; the extraction of the brightness adjustment data may be performed sequentially in time order, or may be performed by extracting all the brightness adjustment data at once.
In step S130, the backlight driving chip 30 is controlled to feed back a response to the timing control chip 20, and the timing control chip 20 finishes data transmission to the backlight driving chip 30 according to the feedback response. 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 response signal to the timing control chip 20 to notify the timing control chip 20 that the data reception is completed. After the timing control chip 20 receives the feedback response, the data transmission to the backlight driving chip 30 is ended. Through the steps, the transmission of the brightness adjusting data is smoothly completed.
In addition, as shown in fig. 8, before the brightness adjustment data is transmitted to the backlight driving chip 30 for adjustment, the storage position of the brightness adjustment data needs to be determined. Before the step of extracting the brightness adjustment data and sending the extracted brightness adjustment data to the backlight driving chip 30, the method includes:
step S140, controlling the timing control chip 20 to send an initial instruction to the backlight driving chip 30 and send an equipment address, wherein the backlight driving chip 30 receives the equipment address and feeds back a first response signal to the timing control chip 20; the device address may be understood as an I2C device address. After receiving the correct device address, the backlight driver chip 30 notifies the timing controller chip 20 to feed back the first response signal to the timing controller chip 20, and after receiving the first response signal, the timing controller chip 20 facilitates subsequent transmission.
Step S150, the timing control chip 20 sends the address of the configuration data register storing the brightness adjustment data to the backlight driving chip 30 according to the first response signal, wherein the backlight driving chip 30 feeds back a second response signal to the timing control chip 20 after receiving the address of the configuration data register; here, the address of the configuration data register represents the holding position of the brightness adjustment data. Similarly, after the backlight driver chip 30 receives the address of the configuration data register, the timing controller chip 20 is notified that the data is accurate, and a second response signal is fed back to the timing controller chip 20, so that the timing controller chip 20 is convenient to perform a subsequent transmission operation after receiving the second response signal. The feedback acknowledgement, the first acknowledgement signal and the second acknowledgement signal may all respond with an ACK bit of 0. ACK is an acknowledgement character, which is an abbreviation for acknowledgement character, and is a transmission type control character that a receiving station sends to a sending station in data communication. Indicating that the transmitted data is received without errors.
In step S160, the timing control chip 20 performs the step of extracting the brightness adjustment data according to the second response signal, and sending the brightness adjustment data to the backlight driving chip 30. After the address for storing the brightness adjustment data is determined, the brightness adjustment data is extracted and sent to the backlight driving chip 30. The backlight driving chip 30 is driven to drive the backlight 90.
For clarity of the steps of the backlight driving method of the present embodiment, the following examples further illustrate: 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, and when it reads that bit0 bit is 1, bit1 bit is 0, and bit2 bit is 1 in the address 0x00701 of the configuration data register (DPCD), that is, when 101, it determines that the timing control chip 20 supports the AUX auxiliary transmission channel to control the backlight driving chip 30.
When the display control chip 10 reads that bit0 is 0, bit1 is 1, and bit2 is 0 of the address 0x00702 of the configuration data register, that is, 010, the timing control chip 20 supports 1 byte support precision of backlight brightness. At this time, the display control chip 10 writes a 0x0000 code to the 00722h address of the configuration data register of the timing control chip 20 through the AUX auxiliary transmission channel, where 0x0000 represents that the backlight brightness is set to 0%, that is, the backlight 90 is turned off, and black is displayed. The code value may also be increased until 0x00FF represents 100% brightness.
When transmitting the brightness adjustment data to the backlight driving chip 30, the timing control chip 20 sends a start instruction to the backlight control chip through the internal I2C communication bus, and then sends an I2C device address and a write bit such as: 0x92. After the backlight control chip receives the correct I2C equipment address with the write bit, the first response signal is fed back, namely, the response is fed back by using an ACK bit 0. The timing control chip 20 then sends the address of the configuration data register to be written, such as: 0x04, the backlight control chip feeds back with the second acknowledgement signal after receiving the address of the configuration data register to be accessed, i.e. feeds back the response with ACK bit0 again. The timing control chip 20 then sends the brightness adjustment data corresponding to the address of the configuration data register via the I2C communication bus, such as: 0Xa5. After receiving the brightness adjusting data, the backlight control chip feeds back the data with a feedback response signal, that is, feeds back the response with ACK bit0 again. The timing control chip 20 sends a stop condition via the I2C communication bus to end the entire single-byte write operation, and the backlight 90 is turned on.
While the present application has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present application may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (10)
1. A display device comprises a display control chip and a time sequence control chip, wherein a first signal transmission channel is arranged between the display control chip and the time sequence control chip;
the display device is characterized by further comprising a backlight driving chip, wherein a second signal transmission channel is arranged between the backlight driving chip and the time sequence control chip;
the display control chip is used for outputting backlight control information, the backlight control information is transmitted to the time sequence control chip through the first signal transmission channel, the time sequence control chip is used for converting the backlight control information into brightness adjusting data, and the brightness adjusting data is output to the backlight driving chip through the second signal transmission channel.
2. The display device according to claim 1, wherein 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, wherein 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, the other end of the first signal line is connected to the first auxiliary pin, one end of the second signal line is connected to the second differential pin, and the other end of the second signal line is connected to the second auxiliary pin;
the timing control chip further comprises a first data pin and a first clock pin, the backlight driving chip comprises a second data pin and a second clock pin, the second signal transmission channel comprises a first connecting line and a second connecting line, one end of the first connecting line is connected with the first data pin, the other end of the first connecting line is connected with the second data pin, one end of the second connecting line is connected with the first clock pin, and the other end of the second connecting line is connected with the second clock pin.
4. The display device according to any one of claims 1 to 3, further comprising a capacitor provided in the first signal transmission channel.
5. A backlight driving method applied to the display device according to claim 1, the driving method comprising:
controlling the time sequence control chip to receive backlight control information sent by the display control chip and converting the backlight control information into brightness adjustment data;
and controlling the time sequence control chip to send the brightness adjusting data to the backlight driving chip.
6. The backlight driving method according to claim 5, wherein the step of controlling the timing control chip to receive the backlight control information sent by the display control chip is preceded by:
determining that the timing control chip supports control of the backlight driving chip.
7. The backlight driving method according to claim 6, wherein the step of determining that the timing control chip supports the control of the backlight driving chip comprises:
reading the configuration information of the time sequence control chip through the display control chip;
and comparing the configuration information with pre-stored information, and judging that the timing sequence control chip supports the control of the backlight driving chip when the configuration information accords with the pre-stored information.
8. The backlight driving method according to claim 6, wherein the step of converting the backlight control information into the brightness adjustment data comprises:
determining the supporting precision of the time sequence control chip on backlight brightness adjustment;
and controlling the display control chip to divide the command according to the supporting precision, wherein the command is divided according to the backlight brightness of 0-100%, and the backlight control information is converted into brightness adjusting data.
9. The backlight driving method according to claim 5, wherein the step of controlling the timing control chip to transmit the brightness adjustment data to the backlight driving chip comprises:
controlling the time sequence control chip to store the brightness adjusting data in a configuration data register;
extracting the brightness adjusting data and sending the brightness adjusting data to the backlight driving chip;
and controlling the backlight driving chip to feed back a response to the time sequence control chip, and finishing data transmission to the backlight driving chip by the time sequence control chip according to the feedback response.
10. The backlight driving method according to claim 9, wherein before the step of extracting and sending the brightness adjustment data to the backlight driving chip, the method comprises:
controlling the time sequence control chip to send an initial instruction to the backlight driving chip and send an equipment address, wherein the backlight driving chip receives the equipment address and feeds a first response signal back to the time sequence control chip;
the time sequence control chip sends an address of a configuration data register for storing the brightness adjusting data to the backlight driving chip according to the first response signal, wherein the backlight driving chip feeds back a second response signal to the time sequence control chip after receiving the address of the configuration data register;
and the time sequence control chip extracts the brightness adjusting data according to the second response signal and sends the brightness adjusting data to the backlight driving chip.
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| CN202211314807.3A CN115620683A (en) | 2022-10-25 | 2022-10-25 | Display device and backlight driving method |
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| CN202211314807.3A CN115620683A (en) | 2022-10-25 | 2022-10-25 | Display device and backlight driving method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116434719A (en) * | 2023-06-14 | 2023-07-14 | 深圳市华星光电半导体显示技术有限公司 | Display device |
| CN116781666A (en) * | 2023-06-15 | 2023-09-19 | 北京显芯科技有限公司 | Address configuration method, backlight control device and display device |
| WO2023226795A1 (en) * | 2022-05-24 | 2023-11-30 | 京东方科技集团股份有限公司 | Display module and control method therefor, and display apparatus |
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2022
- 2022-10-25 CN CN202211314807.3A patent/CN115620683A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023226795A1 (en) * | 2022-05-24 | 2023-11-30 | 京东方科技集团股份有限公司 | Display module and control method therefor, and display apparatus |
| CN116434719A (en) * | 2023-06-14 | 2023-07-14 | 深圳市华星光电半导体显示技术有限公司 | Display device |
| CN116434719B (en) * | 2023-06-14 | 2023-10-17 | 深圳市华星光电半导体显示技术有限公司 | Display device |
| CN116781666A (en) * | 2023-06-15 | 2023-09-19 | 北京显芯科技有限公司 | Address configuration method, backlight control device and display device |
| CN116781666B (en) * | 2023-06-15 | 2024-02-13 | 北京显芯科技有限公司 | Address configuration method, backlight control device and display device |
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