Driving circuit of display equipment, control method of driving circuit and related components

Abstract

The invention belongs to the technical field of display, and discloses a driving circuit of a display device and a control method and related components thereof, the display device comprises a plurality of light-emitting elements, and the driving circuit comprises a driving unit, a processing unit and a power supply circuit. The power supply circuit is connected with the light-emitting elements to provide power supply voltage for the light-emitting elements, and data transmission channels exist between the AM driving chips of the driving unit and the processing unit. And the processing unit is connected with the power supply circuit and is used for configuring threshold voltage for each AM driving chip and adjusting power supply voltage according to a voltage value comparison result of each AM driving chip, and the voltage value comparison result is a comparison result of a driving end voltage value of the AM driving chip and the threshold voltage. Therefore, while the design of the AM driving single-layer board is met, the threshold voltage is configured for each AM driving chip through the processing chip, and the feedback regulation of the power supply voltage is realized in real time according to the voltage value comparison result of each AM driving chip, so that the performance of the light-emitting element is ensured.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and in particular, relates to a driving circuit of a display device, a control method thereof, and related components. Background Art

[0002] With the rapid development of LED (Light-Emitting Diode, referred to as light-emitting element) backlight LCD display, in order to meet the market's requirements for low cost and high quality, LED backlight drive has changed from passive matrix drive (Passive Matrix, referred to as PM) to active matrix (Active matrix, referred to as AM).

[0003] In LED backlight driving, feedback regulation of the voltage (VLED) that powers the backlight LED lamp beads is a crucial function in LCD partition backlight. Feedback regulation of the VLED voltage ensures the display effect of the LED backlight LCD display while minimizing power consumption. However, due to the need for single-layer board design for AM driving, the large number of AM driver chips, and the limited number of pins, the AM driver chip itself cannot implement feedback regulation of the VLED voltage.

[0004] Therefore, how the LED backlight driver can realize VLED voltage feedback regulation under AM driving, thereby improving the overall performance of the LED backlight liquid crystal display, is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The purpose of the present application is to provide a driving circuit of a display device, a control method thereof and related components, which are used to realize feedback adjustment of the power supply voltage of the display device under AM drive, thereby ensuring the display effect of the display device while reducing power consumption and improving the overall performance of the display device.

[0006] In a first aspect, an embodiment of the present application provides a driving circuit of a display device, wherein the display device includes a plurality of light-emitting elements, and the driving circuit includes: a driving unit, a processing unit, and a power supply circuit;

[0007] The power supply circuit is connected to the plurality of light emitting elements and is used to transmit a power supply voltage to the plurality of light emitting elements;

[0008] The driving unit includes a plurality of AM driving chips for driving the plurality of light-emitting elements, and a data transmission channel exists between the plurality of AM driving chips and the processing unit;

[0009] The processing unit is connected to the power supply circuit, and is used to configure a threshold voltage for each of the AM driver chips, and adjust the supply voltage according to a voltage value comparison result of each of the AM driver chips; wherein the voltage value comparison result is a comparison result between the driving end voltage value of the corresponding AM driver chip and the threshold voltage.

[0010] Therefore, while meeting the single-layer board AM driving requirements, a data transmission channel is constructed between the AM driver chip and the processing unit, the threshold voltage of each AM driver chip is configured through the processing unit, and the supply voltage is feedback-adjusted according to the voltage value comparison result of each AM driver chip, thereby ensuring the display effect while reducing costs and improving the overall performance of the display device.

[0011] In a possible implementation manner of the first aspect, the processing unit includes a data processing chip and a current regulating chip, and the data processing chip is connected to the current regulating chip;

[0012] There is a data transmission channel between the data processing chip and the multiple AM ​​driving chips, which is used to generate a control signal according to the comparison result of the voltage values ​​transmitted by each of the AM driving chips;

[0013] The current regulating chip is connected to the controllable constant current end of the power supply circuit, and is used to increase the current drawn from the controllable constant current end according to the control signal, so as to regulate the supply voltage.

[0014] In a possible implementation manner of the first aspect, the current regulating chip is an AM driving chip or a digital-to-analog conversion chip.

[0015] Therefore, the threshold voltage of the AM driver chip is configured through the data processing chip, and a control signal is generated according to the comparison result of the voltage values ​​transmitted by each AM driver chip, and the control signal is transmitted to the current regulating chip, so that the current regulating chip increases or decreases the current drawn from the controllable constant current end according to the control signal to adjust the supply voltage.

[0016] In a possible implementation manner of the first aspect, the multiple AM ​​driver chips are grouped to form a plurality of sub-driver units, and the AM driver chips in each of the sub-driver units are connected in series;

[0017] The processing unit is respectively connected to the AM driving chips located at the first and last positions in series in each of the sub-driving units;

[0018] The AM driver chip at the first position in the series connection among the sub-driver units is used to receive the threshold voltage and transmit the threshold voltage to the remaining AM driver chips in sequence along the direction from the first position to the last position in the series connection;

[0019] The AM driving chip located at the end position in each of the sub-driving units is used to send the voltage value comparison result of each AM driving chip in the corresponding sub-driving unit to the processing unit.

[0020] Therefore, by grouping multiple AM ​​driver chips to form multiple sub-driver units, and connecting the AM driver chips in each sub-driver unit in series, the data processing pressure of the processing unit is reduced, and at the same time, the delay caused by the comparison result of the voltage value transmitted in series by all AM driver chips is avoided, thereby improving the overall performance of the display device.

[0021] In a possible implementation of the first aspect, the AM driving cores at non-end positions in each of the sub-driving units transmit their respective voltage value comparison results in sequence along the direction from the first position to the end of the series connection until they are transmitted to the corresponding AM driving chip at the end position.

[0022] In a possible implementation manner of the first aspect, the power supply circuit is a BUCK circuit or a Boost circuit.

[0023] In a second aspect, an embodiment of the present application provides a control method for a driving circuit, which is applied to a processing unit in the driving circuit, comprising:

[0024] Obtaining a voltage value comparison result of each AM driver chip in the driver unit; wherein the voltage value comparison result is a comparison result between a driving terminal voltage value of the corresponding AM driver chip and a threshold voltage;

[0025] The supply voltage transmitted by the power supply circuit to the light emitting element is adjusted according to the voltage value comparison result.

[0026] In a possible implementation manner of the second aspect, adjusting the supply voltage transmitted by the power supply circuit to the light-emitting element according to the voltage value comparison result includes:

[0027] In the event that any of the driving terminal voltage values ​​is less than the threshold voltage, the controllable constant current terminal of the power supply circuit is triggered to increase the current draw to increase the supply voltage, and the step of obtaining the voltage value comparison result of each AM driving chip in the driving unit and subsequent steps are returned to execute.

[0028] In a possible implementation manner of the second aspect, obtaining a comparison result of voltage values ​​of each AM driver chip in the driver unit includes:

[0029] A voltage value comparison result of each of the AM driver chips transmitted by a first target AM driver chip is obtained; wherein the first target AM driver chip is one or more of the AM driver chips.

[0030] In a possible implementation manner of the second aspect, before obtaining the voltage value comparison result of each AM driving chip in the driving unit, the method further includes:

[0031] Configuring the threshold voltage for each AM driver chip;

[0032] Send a detection signal to a second target AM driver chip; wherein the second target AM driver chip is one or more of the AM driver chips, and the detection signal is used to trigger each of the AM driver chips to determine a corresponding voltage value comparison result, and transmit the corresponding voltage value comparison result to the processing unit via the first target AM driver chip.

[0033] In a third aspect, an embodiment of the present application provides a display device, comprising: a plurality of light-emitting elements and the driving circuit;

[0034] The plurality of light emitting elements are connected to a driving unit in the driving circuit.

[0035] It should be noted that the beneficial effects of the second and third aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0037] Figure 1 A schematic diagram of the structure of a driving circuit of a display device provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of a driving circuit of a display device provided by another embodiment of the present application;

[0039] Figure 3 A schematic diagram of the structure of a driving circuit of another display device provided by another embodiment of the present application;

[0040] Figure 4 A schematic flow chart of a control method of a driving circuit provided in an embodiment of the present application;

[0041] Figure 5 A schematic diagram of the structure of a display device provided in an embodiment of the present application;

[0042] The reference numerals are as follows: 1 is a light emitting element, 2 is a driving unit, 3 is a processing unit, 4 is a power supply circuit, 20 is a sub-driving unit, 30 is a data processing chip, 31 is a current regulating chip, 5 is a display device, and 6 is a driving circuit. DETAILED DESCRIPTION

[0043] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0044] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0045] It should also be understood that the term “and / or” used in the specification and appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0046] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0047] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0048] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0049] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0050] In LED backlight LCD, feedback regulation of the power supply voltage VLED of the backlight LED lamp is an important means to ensure the brightness of the lamp and reduce power consumption. Under the market demand for low cost and high quality, LED backlight drive has changed from PM drive to AM drive.

[0051] However, AM driving requires a single-layer board design, and due to the large number of AM driving chips and the limited number of pins, the AM driving chip itself cannot implement feedback regulation of the VLED voltage.

[0052] In order to solve the above technical problems, an embodiment of the present application provides a driving circuit for a display device, which adds a processing unit that can configure the threshold voltage of an AM driver chip and can adjust the power supply voltage of a light-emitting element. While meeting the single-layer AM drive, a threshold voltage is configured for each AM driver chip through a data transmission channel constructed between the AM driver chip, and feedback adjustment of the power supply voltage is implemented based on the voltage value comparison result of each AM driver chip, thereby ensuring the brightness of the light-emitting element while reducing costs and improving the overall performance of the display device.

[0053] Figure 1 A schematic diagram of the structure of a driving circuit of a display device provided in an embodiment of the present application, wherein the display device includes a plurality of light-emitting elements 1. It should be noted that the light-emitting element 1 may be a light-emitting diode, etc., which is not limited in the present application.

[0054] like Figure 1 As shown, the driving circuit includes: a driving unit 2, a processing unit 3 and a power circuit 4. The power circuit 4 is connected to each light-emitting element 1, respectively, for providing a power supply voltage VLED for each light-emitting element 1. The driving unit 2 includes a plurality of AM driving chips for driving each light-emitting element 1, and there is a data transmission channel between the AM driving chip and the processing unit 3.

[0055] The processing unit 3 is connected to the power supply circuit 4, and the processing unit 3 can transmit the configured threshold voltage V0 to each AM driver chip through the data transmission channel to configure the threshold voltage V0 for each AM driver chip. After the processing unit 3 initiates a voltage detection request to each AM driver chip, each AM driver chip sends the comparison result between the driving end voltage value V1 and the threshold voltage V0 to the processing unit 3 through the data transmission channel. Further, the processing unit 3 adjusts the power supply voltage VLED according to the received comparison result. It should be noted that the power supply circuit 4 can be a BUCK circuit or a Boost circuit.

[0056] Specifically, if the processing unit 3 determines that there is an AM driver chip in all AM driver chip channels whose comparison result is that the driver terminal voltage value V1 is less than the threshold voltage V0, the processing unit 3 triggers the controllable constant current end of the power supply circuit 4 to increase the current draw, and the supply voltage VLED increases.

[0057] After the processing chip adjusts the power supply voltage VLED once, all AM driver chips will compare all driver terminal voltage values ​​V1 with the threshold voltage V0 again, and transmit the comparison results to the processing unit 3 until the driver terminal voltage values ​​V1 of all AM driver chips are greater than or equal to the threshold voltage V0.

[0058] In some optional embodiments, an AM driver chip can be connected to multiple light-emitting elements 1, and the connection end between the AM driver chip and the light-emitting element 1 is the driving end. When the AM driver chip compares the driving end voltage value V1 with the threshold voltage V0, it is necessary to collect the voltage values ​​of all driving ends and compare them with the threshold voltage V0.

[0059] The driving end of the AM driver chip is a constant current channel, which requires a constant input of a desired current. At this time, the driving end voltage V1 needs to be greater than or equal to the threshold voltage V0, thereby ensuring that each driving end reaches the desired current. In fact, the threshold voltage V0 is the most suitable voltage for the driving end of the AM driver chip, and the driving end voltage V1 greater than or equal to the threshold voltage V0 can be achieved by adjusting the power supply voltage VLED.

[0060] It is worth noting that each driving end voltage V1 is equal to the power supply voltage VLED minus the voltage drop V2 of the light emitting element 1, wherein the voltage drop V2 of the light emitting element 1 refers to the voltage drop of the light emitting element 1 connected between the driving end of the AM driving chip and the power supply circuit 4. When the driving end voltage V1 of all AM driving chips is greater than or equal to the threshold voltage V0, the brightness of the light emitting element 1 can be guaranteed while reducing the overall power consumption of the display device. Among them, when the driving end voltage V1 of all AM driving chips is equal to the threshold voltage V0, it is energy optimal.

[0061] Therefore, while satisfying the single-layer board AM driving, a data transmission channel is constructed between the AM driver chip and the processing unit 3, the threshold voltage of each AM driver chip is configured through the processing unit 3, and the feedback adjustment of the power supply voltage is realized according to the voltage value comparison result of each AM driver chip, thereby ensuring the display effect while reducing power consumption and improving the overall performance of the display device.

[0062] Figure 2 A schematic diagram of a driving circuit of a display device provided in another embodiment of the present application is shown in FIG. Figure 2 As shown, the processing unit 3 includes a data processing chip 30 and a current regulating chip 31 , and the data processing chip 30 is connected to the current regulating chip 31 .

[0063] There is a data transmission channel between the data processing chip 30 and multiple AM ​​driver chips. In a specific embodiment, the processing chip is used to configure a threshold voltage V0 for each AM driver chip, control the display image, configure the power supply voltage VLED, and generate a control signal based on the comparison result of the voltage value transmitted by each AM driver chip. Further, the control signal is transmitted to the current regulation chip 31 to adjust the power supply voltage VLED.

[0064] It should be noted that the configured threshold voltage V0 is a characteristic of the data processing chip 30. The threshold voltage V0 is a reference voltage. When the voltage is adjusted, the channel voltage of the driving terminal voltage of each AM driver chip is changed. When the voltage is adjusted, each AM driver chip tests and obtains the actual voltage of the channel and compares it with the configured threshold voltage V0, and feeds the comparison result back to the data processing chip 30. The data processing chip 30 controls the current regulating chip 31 to adjust the power supply voltage VLED, that is, the power supply voltage VLED is adjusted by adjusting the pumping current.

[0065] The current regulating chip 31 is connected to the controllable constant current end of the power supply circuit 4, and is used to increase or decrease the current drawn from the controllable constant current end according to the control signal transmitted by the data processing chip 30 to adjust the power supply voltage, wherein the current regulating chip 31 can be an AM driver chip or a digital-to-analog conversion chip.

[0066] Specifically, the data processing chip 30 configures the current regulating chip 31 according to the voltage comparison result between the channel voltage (voltage at the driving end) returned by each AM driving chip and the threshold voltage V0, thereby enabling the current regulating chip 31 to regulate the power supply voltage VLED.

[0067] In some optional embodiments, when there is an AM driver chip in the driver unit 2 and the comparison result is that the driver terminal voltage V1 is less than the threshold voltage V0, the register in the data processing chip 30 is increased by 1. At this time, the current regulation chip 31 adjusts the current extraction value of the controllable constant current terminal FB of the power supply circuit 4 according to the control signal according to a preset ratio.

[0068] For example, the last transmitted control current level to the current regulating chip 31 is 10. When it is determined that the current driving terminal voltage V1 is still less than the threshold voltage V0, the control current level is increased by 1, that is, at this time, the control current level to the current regulating chip 31 is 11, and the control level 11 is transmitted to the current regulating chip 31. At this time, the controllable constant current terminal FB of the power supply circuit 4 increases the current value according to a certain proportion, thereby increasing the power supply voltage VLED. If the driving terminal voltage V1 of all AM driving chips in the current driving unit 2 is greater than or equal to the threshold voltage V0, the generated control signal is still 10, or no control signal is sent to the current regulating chip 31. At this time, the current regulating chip 31 will continue to draw a stable current with a current level of 10, thereby maintaining the stability of the power supply voltage VLED.

[0069] In fact, the data processing chip 30 configures a digital signal (current value) for the current regulating chip 31, and the current regulating chip 31 converts the configured current value into an actual current, draws current from the power supply circuit 4, and further realizes the regulation of the power supply voltage VLE.

[0070] like Figure 2 As shown, from the perspective of current transmission, the controllable constant current terminal FB of the power supply circuit 4 draws current to the current regulating chip 31, and the adjustment of the value of the drawn current realizes the adjustment of the power supply voltage VLED.

[0071] Therefore, the data processing chip 30 monitors the comparison result between the channel voltage of the AM driver chip and the threshold voltage in real time, and feeds back the comparison result to the current regulation chip 31. The current regulation chip 31 regulates the power supply voltage VLED, thereby ensuring that the channel of the AM driver chip can output a stable constant current and at the same time, the channel voltage is the lowest, saving energy.

[0072] In a specific embodiment, if all AM driver chips in the driver unit 2 are connected to the processing unit 3 respectively, the processing unit 3 needs to be configured with many pins, and the data interaction between the AM driver chips and the processing unit 3 will cause a large data processing pressure on the processing unit 3.

[0073] If all the AM driver chips in the driver unit 2 are connected in series in sequence, and the AM driver chip at the first position in the series and the AM driver chip at the end of the series are connected to the processing unit 3, a large delay will be generated, reducing the efficiency of data processing.

[0074] In order to solve the above technical problems, Figure 3 A schematic diagram of a driving circuit of another display device provided in another embodiment of the present application is shown in FIG. Figure 3As shown, as a preferred embodiment, multiple AM ​​driver chips are grouped to form multiple sub-driver units 20, and the AM driver chips in each sub-driver unit 20 are connected in series, that is, the AM driver chips in the driver unit 2 are grouped to obtain multiple sub-driver units 20, and the AM driver chips in each sub-driver unit 20 are connected in series.

[0075] After grouping, the processing unit 3 is respectively connected to the AM driver chips at the first and last positions in the series connection in each sub-driver unit 20. In a specific embodiment, the AM driver chip at the first position in the series connection in each sub-driver unit 20 is used to receive the threshold voltage V0, and transmit the threshold voltage VO to the remaining AM driver chips in sequence along the direction from the first position in the series connection to the last position in the series connection.

[0076] That is to say, the processing unit 3 transmits the configured threshold voltage V0 to the AM driver chip located at the first position in the series connection in each sub-driver unit 20, and the first AM driver chip transmits the threshold voltage V0 to the next AM driver chip in the series connection in turn, until it is transmitted to the AM driver chip at the end of the series connection. At this time, all AM driver chips in each sub-driver unit 20 are configured with the threshold voltage VO.

[0077] The AM driver chip at the end position in each sub-driver unit 20 is used to send the voltage value comparison result of each AM driver chip in the corresponding sub-driver unit 20 to the processing unit 3. Specifically, in a specific embodiment, the AM driver chip in each sub-driver unit 20 transmits the respective voltage value comparison result to the AM driver chip at the end of the series connection along the direction from the first position to the end of the series connection, and the AM driver chip at the end of the series connection uniformly feeds back the voltage value comparison result of each AM driver chip in the corresponding sub-driver unit 20 to the processing unit 3.

[0078] That is, the AM driving cores at non-last positions in each sub-driving unit 20 transmit their respective voltage value comparison results in sequence along the direction from the first position to the last position in the series connection until they are transmitted to the corresponding AM driving chip at the last position. That is, the voltage value comparison results transmitted to the processing unit 3 by the AM driving chip at the last position in the series connection are multiple, and include the comparison results of all the AM driving chips in the corresponding sub-driving unit 20.

[0079] Furthermore, after receiving the voltage value comparison results transmitted by the AM driver chips at the end of the series connection in the respective driver units 2, the processing unit 3 analyzes the voltage value comparison results and adjusts the supply voltage VLED according to the analysis results.

[0080] In some optional embodiments, after the AM driver chips in the driver unit 2 are grouped to obtain a plurality of sub-driver units 20, any one AM driver chip (target AM driver chip) in the sub-driver unit 20 can be connected to the processing unit 3, and the remaining AM driver chips are connected to the target AM driver chip, whereby the processing unit 3 transmits the threshold voltage to the target AM driver chip, which is then transmitted to the remaining AM driver chips in the corresponding sub-driver unit 20 for configuration. Similarly, the remaining AM driver chips transmit their respective voltage value comparison results to the target AM driver chip, which is then uniformly transmitted to the processing unit 3 by the AM driver chip.

[0081] In another optional embodiment, the AM driver chips in the driver unit 2 are grouped to obtain multiple sub-driver units 20, and the AM driver chips in each sub-driver unit 20 are connected in series, and the AM driver chip located in the middle of the series position is used as the target AM driver chip. During data transmission, the target AM driver chip transmits the threshold voltage along the series path to both sides to each AM driver chip for threshold voltage configuration. Similarly, the remaining AM driver chips transmit their respective voltage value comparison results to the target AM driver chip in sequence along the series path, and the target AM driver chip uniformly transmits them to the processing unit 3 for processing.

[0082] It should be noted that Figure 3 Two groups of sub-driving units 20 are shown as an example, but in actual use, the present application does not limit the number of sub-driving units 20. In addition, each AM driver chip is exemplarily connected to two light-emitting elements 1 (for example, light-emitting diodes), but in actual use, each AM driver chip can be connected to one or more light-emitting elements 1, and the present application does not limit this.

[0083] Therefore, by grouping multiple AM ​​driver chips to form multiple sub-driver units 20, and connecting the AM driver chips in each sub-driver unit 20 in series, the data processing pressure of the processing unit 3 is reduced, and at the same time, the delay caused by the comparison result of the voltage value transmitted in series by all AM driver chips is avoided, thereby improving the overall performance of the display device.

[0084] In the above embodiments, the driving circuit of the display device is described in detail, and the present application also provides an embodiment of a control method of the driving circuit. The method is applied to the processing unit of the driving circuit in any of the above embodiments.

[0085] Figure 4 A flow chart of a control method of a driving circuit provided in an embodiment of the present application is shown as follows: Figure 4 As shown, the method includes:

[0086] S10: Obtaining a voltage value comparison result of each AM driving chip in the driving unit; wherein the voltage value comparison result is a comparison result between a driving terminal voltage value of the corresponding AM driving chip and a threshold voltage;

[0087] S11: adjusting the supply voltage transmitted by the power supply circuit to the light-emitting element according to the voltage value comparison result.

[0088] In a specific embodiment, the processing unit obtains the voltage value comparison result of each AM driver chip in the driver unit, and adjusts the power supply voltage VLED transmitted by the power supply circuit to the light-emitting element according to each voltage value comparison result. The voltage value comparison result is the comparison result of the driving terminal voltage value of the corresponding AM driver chip and the threshold voltage.

[0089] Specifically, when the driving terminal voltage value V1 of any AM driving chip among the AM driving chips is less than the threshold voltage V0, the processing unit triggers the controllable constant current end of the power supply circuit to increase the current drawn, and the power supply voltage VLED increases. The threshold voltage V0 refers to the most suitable voltage at the driving terminal of the AM driving chip.

[0090] Each time the power supply voltage VLED is adjusted, the processing unit re-obtains the voltage comparison result of each AM driver chip in the driver unit until the driving terminal voltage value V1 of all AM driver chips in the driver unit is greater than or equal to the threshold voltage V0.

[0091] That is to say, when there is a situation where the voltage value of any driving terminal is less than the threshold voltage, the controllable constant current terminal of the trigger power supply circuit draws more current to increase the supply voltage, and returns to execute the step of obtaining the voltage value comparison result of each AM driving chip in the driving unit and subsequent steps.

[0092] Therefore, by obtaining the voltage value comparison results of each AM driver chip in the driving unit and adjusting the supply voltage transmitted by the power supply circuit to the light-emitting element according to the voltage value comparison results, the feedback adjustment of the supply voltage is realized while meeting the AM driver single-layer board design, thereby ensuring the brightness of the light-emitting element in the display device and reducing power consumption and cost.

[0093] In some optional embodiments, obtaining the voltage value comparison result of each AM driver chip in the driver unit includes:

[0094] A voltage value comparison result of each AM driver chip transmitted by a first target AM driver chip is obtained; wherein the first target AM driver chip is one or more of the AM driver chips.

[0095] In some optional embodiments, in order to avoid the problem that all the AM driver chips in the driver unit are connected to the processing unit separately, resulting in the need to configure many pins in the processing unit and high data processing pressure, and at the same time, in order to avoid connecting all the AM driver chips in the driver unit in series in sequence, and connecting the AM driver chip at the first series position and the AM driver chip at the end of the series position to the processing unit, resulting in a large delay and low data processing efficiency, all the AM driver chips in the driver unit are grouped to form multiple sub-driver units, and each AM driver chip in each sub-driver unit is connected in series.

[0096] Correspondingly, when obtaining the voltage value comparison result of each AM driver chip in the driving unit, the voltage value comparison result of each AM driver chip transmitted by the first target AM driver chip is obtained. The first target AM driver chip is the AM driver chip located at the end of the series position in each driving unit. When there is one sub-driving unit, there is one first target AM driver chip. When there are multiple sub-driving units, there are multiple first target AM driver chips.

[0097] In some other optional embodiments, all AM driver chips in the driver unit are grouped to form multiple sub-driver units, and each sub-driver unit uses any one of the AM driver chips as the first target AM driver chip. All AM driver chips in the sub-driver unit can be connected in series, and the AM driver chip located in the middle of the series position can be used as the first target AM driver chip, or the AM driver chip in other positions can be used. Further, the first target AM driver chip obtains the voltage value comparison result of each AM driver chip in the corresponding sub-driver unit, and transmits the voltage value comparison result to the processing unit.

[0098] Furthermore, after obtaining the voltage value comparison result, the processing unit performs analysis and adjusts the power supply voltage VLED according to the analysis result, thereby achieving feedback adjustment of the power supply voltage VLED.

[0099] Therefore, the voltage value comparison results of each AM driver chip are transmitted to the processing unit through one or more AM driver chips in each AM driver chip, which reduces the data transmission delay, reduces the number of configuration pins of the processing unit, and reduces the data processing pressure of the processing unit.

[0100] In some optional embodiments, before obtaining the comparison result of the voltage values ​​transmitted by each AM driver chip in the driver unit, the method further includes:

[0101] Configure threshold voltage for each AM driver chip;

[0102] Send a detection signal to the second target AM driver chip; wherein the second target AM driver chip is one or more of the AM driver chips, and the detection signal is used to trigger each AM driver chip to determine the corresponding voltage value comparison result, and transmit the corresponding voltage value comparison result to the processing unit via the first target AM driver chip.

[0103] Before feedback adjustment is performed on the power supply voltage VLED according to the voltage value comparison result, the threshold voltage V0 is first transmitted to each AM driver chip to configure the threshold voltage V0 for each AM driver chip.

[0104] Furthermore, since the threshold voltage V0 of each AM driver chip is the same, after configuring the threshold voltage V0, a ​​detection signal is sent to the second target AM driver chip to initiate a comparison of the voltage value comparison results, wherein the second target AM driver chip is one or more of the AM driver chips, and the detection signal is used to trigger each AM driver chip to determine the corresponding voltage value comparison result, and transmit the corresponding voltage value comparison result to the processing unit via the first target AM driver chip.

[0105] On the basis of the above embodiment, if all the AM driver chips in the driver unit are grouped to form multiple sub-driver units, in order to reduce the delay of configuring the threshold voltage V0, one of the AM driver chips in each sub-driver unit is used as the second target AM driver chip, and the processing unit transmits the configuration voltage V0 to the second target AM driver chip, which is then transmitted to other AM driver chips in the corresponding sub-driver unit by the second target AM driver chip.

[0106] If the AM driver chips in each sub-driver unit are connected in series, the second target AM driver chip may be the AM driver chip located at the first position in the series. After the AM driver chip located at the first position in the series receives the threshold voltage V0, it transmits the threshold voltage VO to the remaining AM driver chips in sequence along the direction from the first position in the series to the end of the series.

[0107] Thus, one or more of all the AM driver chips receive the threshold voltage and transmit it to the remaining AM driver chips, thereby reducing the delay of configuring the threshold voltage.

[0108] It should be noted that the serial numbers of the steps in the embodiments of the present application do not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0109] In the above embodiments, the control method of the driving circuit is described in detail, and the present application also provides a corresponding embodiment of a display device. Figure 5 A schematic diagram of a display device provided in an embodiment of the present application is shown in FIG. Figure 5As shown, the display device 5 includes a plurality of light emitting elements 1 and the driving circuit 6 in the above embodiment, and each light emitting element is connected to a driving unit 2 in the driving circuit 6 .

[0110] Since the display device provided in the embodiment of the present application corresponds to the driving circuit provided in the above embodiment, the beneficial effects produced are the same as those in the above embodiment.

[0111] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A driving circuit for a display device, characterized in that: The display device includes a plurality of light emitting elements, and the driving circuit includes: a driving unit, a processing unit and a power supply circuit; The power supply circuit is connected to the plurality of light emitting elements and is used to transmit a power supply voltage to the plurality of light emitting elements; The driving unit includes a plurality of AM driving chips for driving the plurality of light-emitting elements, and a data transmission channel exists between the plurality of AM driving chips and the processing unit; The processing unit is connected to the power supply circuit, and is used to configure a threshold voltage for each of the AM driver chips, and adjust the supply voltage according to a voltage value comparison result of each of the AM driver chips; wherein the voltage value comparison result is a comparison result between the driving end voltage value of the corresponding AM driver chip and the threshold voltage.

2. The driving circuit of the display device according to claim 1, characterized in that: The processing unit includes a data processing chip and a current regulating chip, and the data processing chip is connected to the current regulating chip; There is a data transmission channel between the data processing chip and the multiple AM ​​driving chips, which is used to generate a control signal according to the comparison result of the voltage values ​​transmitted by each of the AM driving chips; The current regulating chip is connected to the controllable constant current end of the power supply circuit, and is used to increase the current drawn from the controllable constant current end according to the control signal, so as to regulate the supply voltage.

3. The driving circuit of the display device according to claim 2, characterized in that: The current regulating chip is an AM driving chip or a digital-to-analog conversion chip.

4. The driving circuit of the display device according to claim 1, characterized in that: The multiple AM ​​driving chips are grouped to form a plurality of sub-driving units, and the AM driving chips in each of the sub-driving units are connected in series; The processing unit is respectively connected to the AM driving chips located at the first and last positions in series in each of the sub-driving units; The AM driver chip at the first position in the series connection among the sub-driver units is used to receive the threshold voltage and transmit the threshold voltage to the remaining AM driver chips in sequence along the direction from the first position to the last position in the series connection; The AM driving chip located at the end position in each of the sub-driving units is used to send the voltage value comparison result of each AM driving chip in the corresponding sub-driving unit to the processing unit.

5. The driving circuit of the display device according to claim 4, characterized in that: The AM driving cores at non-last positions in each of the sub-driving units transmit their respective voltage value comparison results in sequence along the direction from the first position to the last position in the series connection until they are transmitted to the corresponding AM driving chip at the last position.

6. The driving circuit of the display device according to claim 1, characterized in that: The power supply circuit is a BUCK circuit or a Boost circuit.

7. A control method for a driving circuit, applied to a processing unit in a driving circuit according to any one of claims 1 to 6, characterized in that: include: Obtaining a voltage value comparison result of each AM driver chip in the driver unit; wherein the voltage value comparison result is a comparison result between a driving terminal voltage value of the corresponding AM driver chip and a threshold voltage; The supply voltage transmitted by the power supply circuit to the light emitting element is adjusted according to the voltage value comparison result.

8. The control method of the driving circuit according to claim 7, characterized in that: The step of adjusting the supply voltage transmitted by the power supply circuit to the light emitting element according to the voltage value comparison result comprises: In the event that any of the driving terminal voltage values ​​is less than the threshold voltage, the controllable constant current terminal of the power supply circuit is triggered to increase the current draw to increase the supply voltage, and the step of obtaining the voltage value comparison result of each AM driving chip in the driving unit and subsequent steps are returned to execute.

9. The control method according to claim 7 or 8, characterized in that: The obtaining of the voltage value comparison result of each AM driver chip in the driver unit includes: A voltage value comparison result of each of the AM driver chips transmitted by a first target AM driver chip is obtained; wherein the first target AM driver chip is one or more of the AM driver chips.

10. The control method of the driving circuit according to claim 9, characterized in that: Before obtaining the voltage value comparison result of each AM driving chip in the driving unit, the method further includes: Configuring the threshold voltage for each AM driver chip; Send a detection signal to a second target AM driver chip; wherein the second target AM driver chip is one or more of the AM driver chips, and the detection signal is used to trigger each of the AM driver chips to determine a corresponding voltage value comparison result, and transmit the corresponding voltage value comparison result to the processing unit via the first target AM driver chip.

11. A display device, characterized in that: include: A plurality of light emitting elements and a driving circuit as claimed in any one of claims 1 to 5; The plurality of light emitting elements are connected to a driving unit in the driving circuit.

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