Driving device and display device

Abstract

A driving device and a display device. The driving device comprises voltage amplification modules and a plurality of source drivers (100). On the basis of a received gamma voltage, each voltage amplification module generates a corresponding target gamma voltage, and input ends of the plurality of source drivers (100) are connected to output ends of the voltage amplification modules so as to output corresponding grayscale voltages.

Description

Driving device and display device

[0001] This application claims priority to Chinese patent application No. 202311614218.1 filed on November 27, 2023. The contents of the above-mentioned Chinese patent application disclosure are hereby incorporated by reference in their entirety as part of this application. Technical Field

[0002] The present application relates to, but is not limited to, the field of display technology, and specifically to a driving device and a display device. Background Art

[0003] With the development of display technology, the size of products above 4K is getting larger and larger. As a result, the gamma voltage lines on the PCBA become longer, resulting in increased impedance and voltage drop. In related technologies, each source driver needs to add a voltage amplifier module to each gamma voltage line to prevent gamma voltage drop from causing panel display brightness differences.

[0004] When there are multiple channels of gamma voltages, multiple voltage amplification modules are required in each source driver, which increases the size and power consumption of the source driver. SUMMARY OF THE INVENTION

[0005] Embodiments of the present application provide a driving device and a display device to solve the problem that when there are multiple channels of gamma voltage, each source driver requires multiple voltage amplification modules, which results in an increase in the size and power consumption of the source driver.

[0006] To solve the above problems, the technical solutions provided by this application are as follows:

[0007] In a first aspect, an embodiment of the present application provides a driving device for driving a display panel, the driving device comprising a printed circuit board and a plurality of source drivers connected to the printed circuit board, wherein a plurality of signal transmission lines are provided on the printed circuit board, and the plurality of signal transmission lines are connected to each of the source drivers; wherein each of the source drivers comprises a voltage amplification module, an output end of the voltage amplification module is electrically connected to one of the signal transmission lines, an input end of the voltage amplification module is connected to a gamma signal source to receive an initial gamma voltage, and the voltage amplification module is used to amplify the initial gamma voltage into a target gamma voltage, and output the target gamma voltage to the corresponding source driver via the signal transmission line.

[0008] In a second aspect, an embodiment of the present application provides a display device, comprising a display panel and a driving device as described in any one of the first aspects, wherein the driving device comprises a printed circuit board and a plurality of source drivers connected to the printed circuit board, wherein a plurality of signal transmission lines are provided on the printed circuit board, and the plurality of signal transmission lines are connected to each of the source drivers; wherein each of the source drivers comprises a voltage amplification module, an output end of the voltage amplification module is electrically connected to one of the signal transmission lines, an input end of the voltage amplification module is connected to a gamma signal source to receive an initial gamma voltage, and the voltage amplification module is used to amplify the initial gamma voltage into a target gamma voltage, and output the target gamma voltage to the corresponding source driver via the signal transmission line. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] FIG1 is a schematic diagram of the structure of a circuit of a driving device in the related art;

[0010] Figure 2 is a schematic diagram of the structure of the display device of the present application;

[0011] Figure 3 is a schematic diagram of the structure of the circuit of part of the driving device in Figure 2;

[0012] FIG4 is a schematic diagram showing the connection relationship of part of the source drivers according to an embodiment of the present application. Modes for Carrying Out the Invention

[0013] To make the purpose, technical solutions and effects of this application clearer and more specific, the following further describes this application in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain this application and are not intended to limit this application.

[0014] In one embodiment, the voltage amplification module includes a voltage follower unit, the first input end of the voltage follower unit is electrically connected to the gamma signal source, the second input end and the output end of the voltage follower unit are both electrically connected to one of the signal transmission lines, and the voltage input unit is used to make the target gamma voltage on the transmission signal line equal to the initial gamma voltage.

[0015] In one embodiment, the voltage follower unit includes: an operational amplifier, the non-inverting input terminal of the operational amplifier is electrically connected to the gamma signal source to receive the initial gamma voltage, and the inverting input terminal and output terminal of the operational amplifier are both electrically connected to a corresponding one of the signal transmission lines.

[0016] In one embodiment, the driving device further includes a plurality of gamma signal lines, which are used to connect to the gamma signal source to transmit the initial gamma voltage. Among the plurality of gamma signal lines, some of the gamma signal lines are electrically connected to the voltage amplification module, and another part of the gamma signal lines are electrically connected to the signal transmission line.

[0017] In one embodiment, each of the source drivers includes a digital-to-analog conversion module, and the multiple input terminals of each of the digital-to-analog conversion modules are connected one-to-one with the multiple signal transmission lines. Each of the digital-to-analog conversion modules generates corresponding multiple grayscale voltages according to the voltages on the multiple signal transmission lines.

[0018] In one embodiment, the multiple initial gamma voltages include a first gamma voltage, a second gamma voltage, and a third gamma voltage with increasing voltage values, and the digital-to-analog conversion module generates a first grayscale voltage and a third grayscale voltage based on the first gamma voltage and the third gamma voltage, one of the first grayscale voltage and the third grayscale voltage causes the driving device to display a white picture, and the other of the first grayscale voltage and the third grayscale voltage causes the driving device to display a black picture; wherein, the gamma signal line for providing the first gamma voltage and the third gamma voltage is electrically connected to the transmission line, and the gamma signal line for providing the second gamma voltage is electrically connected to the corresponding voltage amplification module.

[0019] In one embodiment, the voltage amplification module includes a voltage follower unit, the first input end of the voltage follower unit is electrically connected to the gamma signal line, the second input end and the output end of the voltage follower unit are both electrically connected to the signal transmission line, and the voltage input unit is used to make the target gamma voltage on the transmission signal equal to the initial gamma voltage on the gamma signal line.

[0020] In one embodiment, the voltage follower unit includes: an operational amplifier, the non-inverting input terminal of the operational amplifier is electrically connected to the gamma signal line to receive the gamma voltage, and the inverting input terminal and output terminal of the operational amplifier are both electrically connected to the corresponding signal transmission line.

[0021] In one embodiment, each of the source drivers includes a digital-to-analog conversion module, and the multiple input terminals of each of the digital-to-analog conversion modules are connected one-to-one with the multiple signal transmission lines. Each of the digital-to-analog conversion modules generates corresponding multiple grayscale voltages according to the voltages on the multiple signal transmission lines.

[0022] The beneficial effects of the present application are as follows: in this embodiment, by setting the voltage amplification module, the voltage amplification module receives the initial gamma voltage, and transmits the corresponding target gamma voltage generated according to the initial gamma voltage to each of the source drivers, thereby avoiding the need to set multiple amplification modules in each of the source drivers to amplify the gamma voltage, reducing the size of the source driver, reducing the power consumption of the source driver, and improving the technical problem in the related art that multiple voltage amplification modules need to be set in each source driver, resulting in an increase in the size of the source driver and increased power consumption.

[0023] With the advancement of display technology, products with resolutions above 4K are becoming larger and larger. Consequently, the gamma voltage traces on the control circuit board become longer, resulting in increased impedance and voltage drop. Each source driver needs to add a voltage amplifier module to each gamma voltage path to prevent gamma voltage drop from causing brightness differences on the panel.

[0024] In the related art, as shown in FIG1 , a driving device includes a control circuit board 200 and a source driver 100. When there are multiple channels of gamma voltage, each source driver 100 needs to be provided with multiple voltage amplification modules. Each voltage amplification module amplifies the gamma voltage of a channel, and the amplified gamma voltage is then converted into grayscale voltage by other modules within the source driver 100. Since each source driver 100 needs to be provided with multiple voltage amplification modules, the size of the source driver 100 increases and the power consumption increases.

[0025] To address the above-mentioned issues, embodiments of the present application provide a driving device. As shown in Figures 2 and 3, the driving device includes multiple source drivers 100 and a control circuit board 200. The control circuit board 200 is configured to receive an initial signal GMX_IN, which includes multiple initial gamma voltages GM. Multiple signal transmission lines (L1-L14) are provided on the control circuit board 200. Each of these signal transmission lines is connected to each of the source drivers 100.

[0026] Each of the source drivers 100 includes a voltage amplifying module configured to receive a plurality of initial gamma voltages GM and generate a corresponding plurality of target gamma voltages according to the received initial gamma voltages GM.

[0027] Each input terminal of the plurality of source drivers 100 is connected to the output terminal of the voltage amplification module to receive the target gamma voltage output by the voltage amplification module and output a corresponding grayscale voltage based on the target gamma voltage. It will be appreciated that because the plurality of voltage amplification modules receive the plurality of initial gamma voltages GM and output the generated plurality of target gamma voltages to the respective input terminals of the plurality of source drivers 100, there is no need to provide multiple amplification modules in each source driver 100 to amplify the initial gamma voltages GM, thereby reducing the size of the source driver 100 and lowering its power consumption.

[0028] In this embodiment, the voltage amplification module is provided so that the voltage amplification module receives the initial gamma voltage GM and transmits the corresponding target gamma voltage generated according to the initial gamma voltage GM to each of the source drivers, thereby avoiding the need to provide multiple amplification modules in each of the source drivers 100 to amplify the initial gamma voltage GM, reducing the size of the source driver 100, reducing the power consumption of the source driver 100, and improving the technical problem in the related art that multiple voltage amplification modules are required to be provided in each source driver 100, resulting in an increase in the size of the source driver 100 and an increase in power consumption.

[0029] In one embodiment, the voltage amplification module includes voltage follower units (GOPs). Each of the voltage follower units (GOPs) receives an initial gamma voltage GM and generates a corresponding target gamma voltage based on the received initial gamma voltage GM. It is understood that the number of the voltage follower units (GOPs) is the same as the number of the initial gamma voltages GM to be amplified, but the number of the voltage follower units (GOPs) is not necessarily the same as the total number of the initial gamma voltages GM.

[0030] Each input terminal of the plurality of source drivers 100 is connected to the output terminals GM_OUT of the plurality of voltage follower units GOP via a plurality of signal transmission lines, thereby receiving the target gamma voltage output by the voltage follower unit GOP and outputting a corresponding grayscale voltage based on the target gamma voltage. It will be appreciated that since each voltage follower unit GOP receives an initial gamma voltage GM and outputs a generated target gamma voltage to the plurality of source drivers 100, there is no need to include multiple voltage follower units GOP in each source driver 100 to amplify the initial gamma voltage GM, thereby reducing the size of the source driver 100 and lowering the power consumption of the source driver 100.

[0031] In this embodiment, by setting the voltage follower unit GOP, each of the voltage follower unit GOP receives the initial gamma voltage GM and outputs the generated target gamma voltage to the multiple source drivers 100, thereby eliminating the need to set multiple voltage follower units GOP in each of the source drivers 100 to amplify the initial gamma voltage GM, thereby reducing the size of the source driver 100 and the power consumption of the source driver 100, and improving the technical problem in the related art that multiple voltage amplification modules are required to be set in each source driver 100, resulting in an increase in the size of the source driver 100 and an increase in power consumption.

[0032] In one embodiment, the voltage follower unit GOP includes an operational amplifier, a non-inverting input terminal GM_IN of the operational amplifier is configured to receive the initial gamma voltage GM, an inverting input terminal and an output terminal GM_OUT of the operational amplifier are electrically connected, and an output terminal GM_OUT of the operational amplifier is configured to output the target gamma voltage.

[0033] In one embodiment, the driving device further includes a plurality of gamma signal lines and a plurality of signal transmission lines. Each gamma signal line GM_IN is configured to receive an initial gamma voltage GM. Specifically, the gamma signal line is electrically connected to a gamma signal source on the control circuit board for generating the gamma signal. The non-inverting input terminal GM_IN of each operational amplifier is electrically connected to one of the gamma signal lines, and the output terminal GM_OUT of each operational amplifier is electrically connected to one of the signal transmission lines. The operational amplifier amplifies the initial gamma voltage GM on the gamma signal line and outputs the target gamma voltage to the signal transmission line. It can be understood that since the non-inverting input terminal GM_IN of the operational amplifier receives the initial gamma voltage GM, and the inverting input terminal of the operational amplifier is electrically connected to the output terminal GM_OUT of the operational amplifier, according to the infinite input impedance of the ideal operational amplifier, the current flowing into and out of the non-inverting input terminal GM_IN of the operational amplifier is zero, that is, there is no current, so that the connection line connecting the operational amplifier and the source driver 100, that is, the gamma signal line, almost no voltage drop is generated, and then the output terminal of the operational amplifier outputs the initial gamma voltage GM without a voltage drop, that is, the target gamma voltage.

[0034] The source driver 100 includes a digital-to-analog conversion module (not shown) for converting the initial gamma voltage GM into the grayscale voltage. An input terminal of the digital-to-analog conversion module (i.e., an input terminal of the source driver 100) is electrically connected to the plurality of signal transmission lines. The digital-to-analog conversion module is configured to generate the plurality of grayscale voltages based on the target gamma voltages on the signal transmission lines.

[0035] As shown in Figure 4, in some embodiments, the gamma signal source provides a total of 14 initial gamma voltages GM (GM1-GM14). Accordingly, 14 gamma signal lines are provided, each transmitting an initial gamma voltage GM. The non-inverting input terminal GM_IN of each voltage follower unit GOP is electrically connected to a gamma signal line to generate a corresponding target gamma voltage based on the corresponding initial gamma voltage GM. The output terminal GM_OUT of each voltage follower unit GOP is electrically connected to a signal transmission line to transmit the generated target gamma voltage to the signal transmission line. Accordingly, the number of voltage follower units GOP and signal transmission lines is also 14. The input terminals of each digital-to-analog conversion module within the source driver 100 are electrically connected to the 14 signal transmission lines to generate the grayscale voltages based on the corresponding target gamma voltages on the signal transmission line N.

[0036] In some embodiments, the initial gamma voltage GM is a digital voltage, the grayscale voltage is an analog voltage, and the digital-to-analog conversion module is a digital-to-analog converter.

[0037] It should be noted that the number of the voltage-following units GOP is determined by the initial gamma voltages GM that need to be amplified. For example, in the above embodiment, each initial gamma voltage GM needs to be amplified, and the number of the voltage-following units GOP is equal to the number of the initial gamma voltages GM. However, in some embodiments, only some of the initial gamma voltages GM need to be amplified. In this case, the number of the voltage-following units GOP is not equal to the number of the initial gamma voltages GM.

[0038] In one embodiment, some of the gamma signal lines are electrically connected to the voltage amplification module, while others are electrically connected to the signal transmission line. Specifically, the gamma signal source provides a total of 14 initial gamma voltages GM (GM1-M14). Accordingly, there are 14 gamma signal lines, each of which transmits one initial gamma voltage GM. The initial gamma voltages GM include a first gamma voltage, a second gamma voltage, and a third gamma voltage with increasing voltage values. The digital-to-analog conversion module generates a first grayscale voltage and a third grayscale voltage based on the first and third gamma voltages. One of the first and third grayscale voltages causes the driver device to display a white image, while the other of the first and third grayscale voltages causes the driver device to display a black image. The first digital-to-analog conversion module generates a second grayscale voltage based on the second gamma voltage. The second grayscale voltage causes the driver device to display an image other than white or black. The first gamma voltage and the third gamma voltage include a total of four initial gamma voltages GM (GM1, GM7, GM8, and GM14), and the second gamma voltage includes a total of ten initial gamma voltages GM (GM2 to GM6, GM9 to GM13).

[0039] Because the human eye cannot detect voltage differences caused by line resistance when displaying a black and white image, the gamma signal lines used to provide the first and third gamma voltages are directly electrically connected to the signal transmission lines, without requiring amplification by the voltage follower unit GOP. Consequently, only ten voltage follower units GOP are required. The non-inverting input terminal GM_IN of each voltage follower unit GOP is electrically connected to a gamma signal line to generate the corresponding target gamma voltage based on the corresponding initial gamma voltage GM. The output terminal GM_OUT of each voltage follower unit GOP is electrically connected to a signal transmission line to transmit the generated target gamma voltage to the signal transmission line. This also results in a total of fourteen signal transmission lines, ten of which are electrically connected to the output terminal GM_OUT of the voltage follower unit GOP, and the remaining four are electrically connected to the gamma signal lines. Therefore, there are both signal transmission lines for transmitting the target gamma voltages and signal transmission lines for transmitting the initial gamma voltage GM.

[0040] The input end of the digital-to-analog conversion module in each of the source drivers 100 is electrically connected to the 14 signal transmission lines, thereby receiving the initial gamma voltage GM and the target gamma voltage on the signal transmission lines, and generating the grayscale voltage according to the corresponding initial gamma voltage GM and the target gamma voltage.

[0041] It can be understood that, through the above configuration, compared with the above embodiment, the number of the voltage follower units GOP is saved, thereby reducing the volume of the source driver 100 and lowering the power consumption of the source driver 100 .

[0042] In some embodiments, the initial gamma voltage GM is a digital voltage, the grayscale voltage is an analog voltage, and the digital-to-analog conversion module is a digital-to-analog converter.

[0043] In a second aspect, an embodiment of the present application further provides a display device, comprising a display panel 500 and a driving device as described in any of the above embodiments.

[0044] Those skilled in the art will appreciate that modifications or equivalent substitutions may be made to the embodiments of the present application without departing from the spirit and scope of the present application, and such modifications or equivalent substitutions shall be encompassed within the scope of the present application. The various embodiments may be combined with each other but will not be described in detail here.

[0045] This document uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for technical personnel in this field, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A driving device for driving a display panel, wherein: The driving device includes a printed circuit board and a plurality of source drivers connected to the printed circuit board, wherein: The printed circuit board is provided with a plurality of signal transmission lines, and the plurality of signal transmission lines are connected to each of the source drivers; Among them, each of the source drivers includes a voltage amplification module, the output end of the voltage amplification module is electrically connected to one of the signal transmission lines, the input end of the voltage amplification module is connected to the gamma signal source to receive the initial gamma voltage, and the voltage amplification module is used to amplify the initial gamma voltage into a target gamma voltage, and output the target gamma voltage to the corresponding source driver via the signal transmission line.

2. The driving device according to claim 1, wherein: The voltage amplification module includes a voltage follower unit, a first input terminal of the voltage follower unit is electrically connected to the gamma signal source, a second input terminal and an output terminal of the voltage follower unit are both electrically connected to a signal transmission line, and the voltage input unit is used to make the target gamma voltage on the transmission signal line equal to the initial gamma voltage.

3. The driving device according to claim 2, wherein: The voltage follower unit comprises: An operational amplifier, wherein a non-inverting input terminal of the operational amplifier is electrically connected to the gamma signal source to receive the initial gamma voltage, and an inverting input terminal and an output terminal of the operational amplifier are both electrically connected to a corresponding one of the signal transmission lines.

4. The driving device according to claim 3, wherein: The driving device also includes a plurality of gamma signal lines, which are used to connect to the gamma signal source to transmit the initial gamma voltage. Among the plurality of gamma signal lines, some of the gamma signal lines are electrically connected to the voltage amplification module, and another part of the gamma signal lines are electrically connected to the signal transmission line.

5. The driving device according to claim 4, wherein: Each of the source drivers includes a digital-to-analog conversion module, and multiple input terminals of each of the digital-to-analog conversion modules are connected to multiple signal transmission lines one by one. Each of the digital-to-analog conversion modules generates corresponding multiple grayscale voltages according to voltages on multiple signal transmission lines.

6. The driving device according to claim 5, wherein: The multiple initial gamma voltages include a first gamma voltage, a second gamma voltage, and a third gamma voltage with increasing voltage values, the digital-to-analog conversion module generates a first grayscale voltage and a third grayscale voltage according to the first gamma voltage and the third gamma voltage, one of the first grayscale voltage and the third grayscale voltage enables the driving device to display a white picture, and the other of the first grayscale voltage and the third grayscale voltage enables the driving device to display a black picture; The gamma signal line for providing the first gamma voltage and the third gamma voltage is electrically connected to the transmission line, and the gamma signal line for providing the second gamma voltage is electrically connected to the corresponding voltage amplification module.

7. The driving device according to claim 5, wherein: The digital-to-analog conversion module is a digital-to-analog converter.

8. The driving device according to claim 5, wherein: The initial gamma voltage is a digital voltage, and the grayscale voltage is an analog voltage.

9. The driving device according to claim 2, wherein: Each of the initial gamma voltages is amplified, and the number of the voltage follower units is equal to the number of the initial gamma voltages.

10. The driving device according to claim 2, wherein: Part of the initial gamma voltage is amplified, and the number of the voltage follower units is not equal to the number of the initial gamma voltage.

11. A display device, wherein: A display panel and a driving device according to any one of claims 1 to 11, wherein the driving device comprises a printed circuit board and a plurality of source drivers connected to the printed circuit board, wherein the printed circuit board is provided with a plurality of signal transmission lines, and the plurality of signal transmission lines are connected to each of the source drivers; Among them, each of the source drivers includes a voltage amplification module, the output end of the voltage amplification module is electrically connected to one of the signal transmission lines, the input end of the voltage amplification module is connected to the gamma signal source to receive the initial gamma voltage, and the voltage amplification module is used to amplify the initial gamma voltage into a target gamma voltage, and output the target gamma voltage to the corresponding source driver via the signal transmission line.

12. The display device according to claim 11, wherein: The voltage amplification module includes a voltage follower unit, a first input terminal of the voltage follower unit is electrically connected to the gamma signal line, a second input terminal and an output terminal of the voltage follower unit are both electrically connected to the signal transmission line, and the voltage input unit is used to make the target gamma voltage on the transmission signal equal to the initial gamma voltage on the gamma signal line.

13. The display device according to claim 12, wherein: The voltage follower unit comprises: An operational amplifier, wherein a non-inverting input terminal of the operational amplifier is electrically connected to the gamma signal line to receive the gamma voltage, and an inverting input terminal and an output terminal of the operational amplifier are both electrically connected to the corresponding signal transmission line.

14. The display device according to claim 13, wherein: Each of the source drivers includes a digital-to-analog conversion module, and multiple input terminals of each of the digital-to-analog conversion modules are connected to multiple signal transmission lines one by one. Each of the digital-to-analog conversion modules generates corresponding multiple grayscale voltages according to voltages on multiple signal transmission lines.

15. The display device according to claim 14, wherein: The multiple initial gamma voltages include a first gamma voltage, a second gamma voltage, and a third gamma voltage with increasing voltage values, the digital-to-analog conversion module generates a first grayscale voltage and a third grayscale voltage according to the first gamma voltage and the third gamma voltage, one of the first grayscale voltage and the third grayscale voltage enables the driving device to display a white picture, and the other of the first grayscale voltage and the third grayscale voltage enables the driving device to display a black picture; The gamma signal line for providing the first gamma voltage and the third gamma voltage is electrically connected to the transmission line, and the gamma signal line for providing the second gamma voltage is electrically connected to the corresponding voltage amplification module.

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