Display driving circuit

Abstract

The embodiment of the utility model discloses a display driving circuit which comprises a display chip and a storage module electrically connected with the display chip. The TYPE-C interface is connected to the display chip through a DP signal, and the TYPE-C interface is connected to the USB to HDMI module through a USB signal; the HDMI interface and the USB to HDMI module are respectively connected with the switching chip, and are connected with the display chip through the switching chip; the screen driving module is configured to be used for driving the display screen; and the video signal interface is configured to be used for outputting a video signal to the display screen. According to the invention, a DP signal or a USB signal can be adapted through the common TYPE-C interface, the DP signal can be directly output to the display chip, and the USB signal is output to the display chip through the USB-to-HDMI interface. The system has good compatibility. The video output part of the system can adapt to eDP or LVDS signals according to the drive of a display. The application can adapt to touch screens of different touch types through the touch switching module.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of displays, and particularly to a display driving circuit. Background Art

[0002] Existing image output devices have multiple output interfaces, while most displays usually only set common input interfaces and corresponding driving circuits. To adapt to more interfaces, an adapter is generally used for conversion to achieve better compatibility. Obviously, this will lead to a more complex environment and increased operation difficulty. In addition, a general display only has a display function, and its function is relatively single. Summary of the Utility Model

[0003] The embodiments of the present application provide a display driving circuit to solve at least one technical deficiency in the prior art.

[0004] The embodiments of the present application provide a display driving circuit, including a display chip and a storage module electrically connected thereto; and

[0005] A TYPE-C interface, the TYPE-C interface is connected to the display chip through a DP signal, and the TYPE-C interface is connected to a USB to HDMI module through a USB signal; and

[0006] An HDMI interface, the HDMI interface and the USB to HDMI module are respectively connected to a switching chip and connected to the display chip through the switching chip; and

[0007] A screen driving module, the screen driving module is connected to the display chip, and the screen driving module is configured to drive a display screen; and

[0008] A video signal interface, the video signal interface is electrically connected to the display chip, and the video signal interface is configured to output a video signal to the display screen.

[0009] In some embodiments, the video signal interface includes an eDP signal interface and an LVDS signal interface.

[0010] In some embodiments, the TYPE-C interface is electrically connected to a PD and power supply system module through a PD signal, and powers the display chip through the PD and power supply system module.

[0011] In some embodiments, the display driving circuit further includes an operation module electrically connected to the display chip, which is used for a user to adjust various parameters of the display and the working state of the display.

[0012] In some embodiments, the display chip is provided with a power amplifier interface for outputting audio information.

[0013] In some embodiments, the display driving circuit further includes a direction detection module electrically connected to the display chip. The direction detection module is configured to obtain the placement direction of the display screen and feed back the placement direction to the display screen and the display chip.

[0014] In some embodiments, the display driving circuit further includes a photosensitive module electrically connected to the display chip. The photosensitive module is used to obtain environmental data and feed back the environmental data to the display chip;

[0015] The environmental data includes the intensity of environmental light and the distance between a person and the display screen (20).

[0016] In some embodiments, a plurality of TYPE-C interfaces are provided. The plurality of TYPE-C interfaces are all electrically connected to a USB signal switching module and electrically connected to a USB to HDMI module through the USB signal switching module.

[0017] In some embodiments, the USB signal switching module is electrically connected to the display chip through a CH341 interface to implement firmware upgrade.

[0018] In some embodiments, the display driving circuit further includes a USB HUB. The USB signal switching module is electrically connected to the USB to HDMI module through the USB HUB.

[0019] In some embodiments, the USB HUB is extended with at least one USB interface.

[0020] In some embodiments, the display driving circuit further includes a touch switching module electrically connected to the USB HUB. The touch switching module is configured to adapt corresponding touch signals according to the touch type of the touch screen.

[0021] Compared with the prior art, the present application can adapt DP signals or USB signals through a common TYPE-C interface. Among them, the DP signal can be directly output to the display chip, and the USB signal is output to the display chip through a USB-to-HDMI interface. In addition, the present application also provides an independent HDMI interface, which can directly adapt HDMI signals. Third, the present application has good compatibility: in the video output part of the present application, it can adapt eDP or LVDS signals according to the driver of the display; the present application can adapt touchscreens of different touch types through a touch switching module. Fourth, the present application is provided with a direction detection module, which can use a three-axis sensor to detect the placement direction of the display screen and adjust the display screen. Fifth, the present application is equipped with a light sensing module, which supports adjusting the brightness of the display screen and the sleep of the display driving circuit according to the ambient light or the distance between the person and the display screen, and the display chip controls according to the data fed back by the light sensing module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings forming a part of this application are used to provide a further understanding of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. Among them:

[0023] Figure 1 Schematic diagram of the circuit structure in an embodiment of the present application Figure 1 ;

[0024] Figure 2 Schematic diagram of the circuit structure in an embodiment of the present application Figure 2 ;

[0025] Figure 3 Schematic diagram of the circuit structure in an embodiment of the present application Figure 3 .

[0026] DESCRIPTION OF THE REFERENCE NUMERALS:

[0027] 10 - Display chip; 1101 - HDMI interface; 1102 - Switching chip; 1103 - TYPE-C interface; 1104 - PD and power supply system module; 1105 - USB signal switching module; 1106 - USB HUB; 1107 - USB-to-HDMI module; 1108 - USB interface; 1109 - Touch switching module; 1110 - CH341 interface; 1201 - Screen driving module; 1202 - Video signal interface; 13 - Power amplifier interface; 14 - Direction detection module; 15 - Operation module; 16 - Light sensing module; 17 - Storage module;

[0028] 20 - Display screen. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present application rather than a limitation of the present application. In fact, those skilled in the art will appreciate that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, features shown or described as part of one embodiment can be used in another embodiment to yield yet another embodiment. Accordingly, it is intended that the present application cover such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0030] In the description of the present application, the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application rather than requiring the present application to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present application. The terms "connected", "coupled", and "disposed" used in the present application should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate component; it can be a wired connection, a radio connection, or a wireless communication signal connection. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] One or more examples of the present application are shown in the accompanying drawings. The detailed description uses numerical and alphabetical labels to refer to features in the drawings. Similar or like labels in the drawings and the description have been used to refer to similar or like parts of the present application. As used herein, terms such as "first", "second", and "third" can be used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of individual components.

[0032] As Figure 1 shown, according to an embodiment of the present application, a display driving circuit is provided, including a display chip 10 and a storage module 17 connected thereto.

[0033] The image input signal of the display chip 10 includes an HDMI signal or a DP signal. Among them, the HDMI signal can be directly accessed through the HDMI interface 1101; in addition, the HDMI signal can also convert the USB signal into an HDMI signal through the USB to HDMI module 1107. For example, in some embodiments, the chip used is AM8269D, which can convert USB to HDMI; the HDMI interface 1101 and the USB to HDMI module 1107 are connected to the display chip 10 through a switching chip 1102. Among them, in some embodiments, the switching chip 1102 can be implemented by ASW3642.

[0034] The USB signal can also be a DP signal and can directly serve as the image input signal of the display chip 10. Among them, the USB signal is connected through the TYPE-C interface 1103. Therefore, the TYPE-C interface 1103 is connected to the display chip 10 through the DP signal and is connected to the USB to HDMI module 1107 through the conventional USB signal.

[0035] In some embodiments, the above TYPE-C interface is connected to the PD and power supply system module 1104 through the PD signal and powers the display chip 10 through the PD and power supply system module 1104.

[0036] The display module is electrically connected to the display screen 20 through the screen driving module 1201 and the video signal interface 1202. Among them, the screen driving module 1201 includes a backlight circuit and a dimming circuit. The video signal interface 1202 includes an eDP signal interface or an LVDS signal interface, and the display screen 20 can be adapted to one of the video signal interfaces 1202.

[0037] In some embodiments, the display driving circuit further includes an operation module 15 electrically connected to the display chip 10, which is used for users to adjust various parameters of the display and the working state of the display. The operation module 15 includes buttons, touch switches, induction switches, etc. In some embodiments, the operation module 15 is also provided with an indicator light for feedback operation results or for making responses to operations. Some parameters of the display screen 20 can be adjusted through the operation module 15, such as HDR, color temperature, brightness, contrast, display mode, display ratio, etc.

[0038] In some embodiments, the display chip 10 is provided with a power amplifier interface 13, which can output audio information externally to improve the user experience.

[0039] The display screen is generally rectangular. In different application environments, the display content needs to be adjusted accordingly according to whether the display screen 20 is in the landscape or portrait state. For this reason, in some embodiments, the display driving circuit further includes a direction detection module 14, which is electrically connected to the display screen 20 and the display chip 10 respectively. The direction detection module 14 can obtain the placement direction of the display screen 20, and the display screen 20 and the display chip 10 adjust the display content according to the data fed back by the direction detection module 14, so that the physical state of the display screen 20 matches the display content. Among them, in some embodiments, the direction detection module 14 can use a three-axis sensor STK8BA58 to obtain the current placement direction of the display screen 20.

[0040] In some embodiments, the display driving circuit further includes a photosensitive module 16, which is electrically connected to the display chip 10 and supports controlling the brightness of the display screen 20 and the sleep of the display driving circuit according to the ambient light or the distance between the person and the display screen 20. The display chip 10 controls according to the data fed back by the photosensitive module 16.

[0041] As Figure 2 shown, in some embodiments, several TYPE-C interfaces 1103 may be provided. In this embodiment, two TYPE-C interfaces 1103 are provided, namely TYPE-C interface 1 and TYPE-C interface 2, and both TYPE-C interface 1 and TYPE-C interface 2 are connected to the input end of the USB signal switching module 1105, and the output end of the USB signal switching module 1105 is connected to the USB to HDMI module 1107. Multiple TYPE-C interfaces 1103 can be more flexible in application.

[0042] During the application of the display system, there is firmware upgrade and maintenance. In some embodiments, the above-mentioned USB signal switching module 1105 can be connected to the display chip 10 through the CH341 interface 1110. During firmware upgrade, it can be connected to an external device through the TYPE-C interface 1103 to achieve online firmware upgrade.

[0043] As Figure 3 shown, in some embodiments, in order to further expand the USB interface 1108, a USB HUB 1106 is added, and the above-mentioned USB signal switching module 1105 is connected to the USB to HDMI module 1107 through the USB HUB 1106. In addition, at least one USB interface 1108 can be expanded through the USB HUB 1106.

[0044] In some embodiments, the display driving circuit further includes a touch switching module 1109, which is electrically connected to the above-mentioned USB HUB 1106. The touch switching module 1109 can make corresponding adaptations according to the touch drive of the touch screen, including supporting USB touch signals or IIC touch signals. When the screen is USB touch type, it can be directly connected to the USB signal; when the screen is IIC touch, the USB signal is converted into an IIC signal through the CH554 chip. The touch screen can feedback the touch signal to an external device through the touch switching module 1109 and the USB HUB 1106. The external device can make corresponding responses according to the touch signal.

[0045] The above are only some embodiments of the present application and are not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A display driving circuit, characterized in that: It comprises a display chip (10) and a storage module electrically connected thereto; and A TYPE-C interface (1103), wherein the TYPE-C interface (1103) is connected to the display chip (10) via a DP signal, and the TYPE-C interface (1103) is connected to a USB to HDMI module (1107) via a USB signal; and An HDMI interface (1101), wherein the HDMI interface (1101) and the USB to HDMI module (1107) are respectively connected to a switching chip (1102), and connected to the display chip (10) through the switching chip (1102); and a screen driving module (1201), the screen driving module (1201) being connected to the display chip (10), the screen driving module (1201) being configured to drive the display screen (20); and A video signal interface (1202), the video signal interface (1202) is electrically connected to the display chip (10), and the video signal interface (1202) is configured to output a video signal to the display screen (20).

2. The display driving circuit according to claim 1, characterized in that: The video signal interface (1202) includes an eDP signal interface and a LVDS signal interface.

3. The display driving circuit according to claim 1, characterized in that: The TYPE-C interface (1103) is electrically connected to the PD and power system module (1104) through a PD signal, and the display chip (10) is powered by the PD and power system module (1104); or / and The display driving circuit further comprises an operating module (15) electrically connected to the display chip (10), which is used for a user to adjust various parameters of the display and the working state of the display; or / and The display chip (10) is provided with a power amplifier interface (13) for outputting audio information.

4. The display driving circuit according to claim 1, characterized in that: The display driving circuit also includes a direction detection module (14) which is electrically connected to the display chip (10), and the direction detection module (14) is configured to obtain the placement direction of the display screen (20) and feed back the placement direction to the display screen (20) and the display chip (10).

5. The display driving circuit according to claim 1, characterized in that: The display driving circuit further comprises a photosensitive module (16), which is electrically connected to the display chip (10), and the photosensitive module (16) is used to obtain environmental data and feed the environmental data back to the display chip (10); The environmental data includes the intensity of the ambient light and the distance between a person and the display screen (20).

6. The display driving circuit according to claim 1, characterized in that: The display driving circuit is provided with a plurality of TYPE-C interfaces (1103), and the plurality of TYPE-C interfaces (1103) are all electrically connected to a USB signal switching module (1105), and are electrically connected to a USB to HDMI module (1107) through the USB signal switching module (1105).

7. The display driving circuit according to claim 6, characterized in that: The USB signal switching module (1105) is electrically connected to the display chip (10) via a CH341 interface (1110) to achieve firmware upgrade.

8. The display driving circuit according to claim 6, characterized in that: The display driving circuit further comprises a USB HUB (1106), and the USB signal switching module (1105) is electrically connected to the USB to HDMI module (1107) via the USB HUB (1106).

9. The display driving circuit according to claim 8, characterized in that: The USB HUB (1106) is extended with at least one USB interface (1108).

10. The display driving circuit according to claim 8, characterized in that: The display driving circuit further comprises a touch switching module (1109), which is electrically connected to the USB HUB (1106), and the touch switching module (1109) is configured to adapt a corresponding touch signal according to a touch type of the touch screen.

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