CN217214114U

CN217214114U - Driving board compatible with various miniature display screens

Info

Publication number: CN217214114U
Application number: CN202123129174.2U
Authority: CN
Inventors: 任立新; 赵苏
Original assignee: Hupan Photoelectric Technology Jiangsu Co ltd
Current assignee: Hupan Photoelectric Technology Jiangsu Co ltd
Priority date: 2021-12-13
Filing date: 2021-12-13
Publication date: 2022-08-16
Anticipated expiration: 2031-12-13

Abstract

The utility model relates to a display drive board technical field, in particular to a drive board compatible with various micro display screens, which comprises a main board, wherein the main board can be also connected with a daughter board, a daughter board interface is arranged on the main board, a coding and decoding circuit is arranged in the main board, and a signal conversion circuit is arranged in the daughter board; the coding and decoding circuit comprises a video signal input module, the video signal input module is electrically connected with a video coding and decoding chip, the video coding and decoding chip is also electrically connected with a daughter board interface and a clock switching circuit respectively, the clock switching circuit is also electrically connected with a clock crystal oscillator, and the daughter board interface is also connected with a VCOM regulating circuit; the mainboard is also provided with a power supply circuit, and the video coding and decoding chip, the daughter board interface, the VCOM regulating circuit, the clock switching circuit and the clock crystal oscillator are all electrically connected with the power supply circuit. The utility model discloses a switching of many kinds of seedboards realizes being suitable for of multiple interface format, reduce cost and development time, the convenient display screen of the different interface formats of fast switch-over simultaneously.

Description

Driving board compatible with various miniature display screens

Technical Field

The utility model relates to a show drive plate technical field, concretely relates to drive plate that can compatible multiple miniature display screen.

Background

In the prior art, the traditional micro display screen driving board has a single interface and only supports one micro display screen. The principle is that video signals are input, a driving board carries out coding and decoding data conversion to be in a screen interface data format, and then display of a screen is achieved. This connection method can only connect a single micro display screen one by one.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects of the prior art and providing a drive board which can be compatible with a plurality of micro display screens.

The utility model provides a following technical scheme:

a drive board compatible with various miniature display screens comprises a main board, wherein the main board can be also connected with a daughter board, a daughter board interface is arranged on the main board, a coding and decoding circuit is arranged in the main board, and a signal conversion circuit is arranged in the daughter board;

the coding and decoding circuit comprises a video signal input module, the video signal input module is electrically connected with a video coding and decoding chip, the video coding and decoding chip is also electrically connected with a daughter board interface and a clock switching circuit respectively, the clock switching circuit is also electrically connected with a clock crystal oscillator, and the daughter board interface is also connected with a VCOM regulating circuit;

the mainboard is further provided with a power supply circuit, and the video coding and decoding chip, the daughter board interface, the VCOM regulating circuit, the clock switching circuit and the clock crystal oscillator are all electrically connected with the power supply circuit.

Preferably, the video codec chip generates a Pclk _1 clock signal, the clock oscillator generates a Pclk _0 clock signal, both the Pclk _1 clock signal and the Pclk _0 clock signal are transmitted to the clock switching circuit, and the clock switching circuit can generate a Pclk _ out signal.

Preferably, the clock switching circuit includes a high-speed switch chip for switching the Pclk _1 clock signal and the Pclk _0 clock signal.

Preferably, the Pclk _1 clock signal is set as a system clock, the clock switching circuit receives the Pclk _1 clock signal and outputs a Pclk _ out clock signal, the Pclk _ out clock signal is transmitted to a daughter board, and the daughter board receives the video signal coded and decoded by the video coding and decoding chip and displays a video.

Preferably, the Pclk _0 clock signal is set as an external clock, the clock switching circuit receives the Pclk _1 clock signal and outputs a Pclk _ out clock signal, and the daughter board calls self-test data of the chip inside the screen to enter a self-test mode.

Preferably, the switching mode of the clock switching circuit adopts a key or a software command.

Preferably, the VCOM adjusting circuit is further connected to an electronic potentiometer, and the VCOM adjusting circuit and the electronic potentiometer constitute a brightness adjusting circuit.

Preferably, the adjustment level of the electronic potentiometer is 256 levels.

Preferably, a coding and decoding chip is arranged in the daughter board, signals output by the daughter board can adopt MIPI signals, LVDS signals, CVBS signals, SDI signals and the like, and the coding and decoding chip of the daughter board corresponds to the output signals of the daughter board.

Preferably, the mainboard is in four location screws are arranged at the daughter board interface, the daughter board is provided with four installation screws, the location screws correspond to the installation screws, and the daughter board is fixedly installed through screws.

The beneficial effects of the utility model are that:

the daughter board is connected with the daughter board through a daughter board interface arranged on the mainboard, a clock crystal oscillator is switched and selected through a clock switching circuit to generate a Pclk _0 clock signal, and the daughter board is enabled to carry out a self-test mode according to an internal chip until a display screen of the daughter board is perfect;

and then, the Pclk _1 clock signal is switched and selected, the received HDMI input signal input by the video input signal module is encoded through a video encoding and decoding chip and is transmitted to the daughter board interface, the encoded RGB signal is received by the daughter board through the daughter board interface and is decoded to obtain a video signal suitable for the interface format of the display, and a video image is output.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic diagram of the daughter board circuit of the present invention;

FIG. 2 is a schematic view of the daughter board structure of the present invention;

FIG. 3 is a schematic view of the daughter board display screen of the present invention;

FIG. 4 is a schematic diagram of the main board structure of the present invention;

fig. 5 is a schematic circuit diagram of the present invention;

fig. 6 shows a brightness adjusting circuit according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

As shown in fig. 1-5, a driving board compatible with various micro display screens includes a main board, the main board is further connectable with a daughter board, the main board is provided with a daughter board interface, the main board is provided with a codec circuit, and the daughter board is provided with a signal conversion circuit. The mainboard is equipped with four location screws at daughter board kneck, sets up in four installation screws on the daughter board, and the location screw corresponds the setting with the installation screw, and the daughter board passes through screw fixed mounting. The sub-board is internally provided with a coding and decoding chip, the output signals of the sub-board can adopt MIPI signals, LVDS signals, CVBS signals, SDI signals and the like, and the coding and decoding chip of the sub-board corresponds to the output signals of the sub-board.

the mainboard is also provided with a power supply circuit, and the video coding and decoding chip, the daughter board interface, the VCOM regulating circuit, the clock switching circuit and the clock crystal oscillator are all electrically connected with the power supply circuit.

And selecting the daughter board with the required interface format according to the requirement, wherein the screws penetrate through the mounting screw holes of the daughter board and are screwed into the positioning screw holes of the mainboard to fix the daughter board.

The clock switching circuit is controlled through a key or an input software command, and the Pclk _0 clock signal is selected to be received. The clock switching circuit outputs a Pclk _ out clock signal, a chip in the daughter board reads data of an internal chip according to the received Pclk _ out clock signal and runs a self-test mode, a display screen of the daughter board displays a video image in the self-test mode, and whether the daughter board is perfectly connected to the mainboard or not is judged according to the video image.

After the self-test mode is passed, the clock switching circuit is controlled through a key or an input software command, and the clock signal Pclk _1 is selected to be received. The clock switching circuit outputs a Pclk _ out clock signal, and the chips in the daughter board receive the Pclk _ out clock signal.

Meanwhile, the video signal input module receives a video signal input by an external HDMI and transmits the video signal to the video coding and decoding chip for coding. And the encoded video signal is transmitted to the daughter board through the daughter board interface, the encoded video signal is decoded by the daughter board according to the received Pclk _ out clock signal, and the format of the video signal is converted into the same format of the daughter board interface.

As shown in FIG. 6, the VCOM adjustment circuit is further connected to an electronic potentiometer, and the VCOM adjustment circuit and the electronic potentiometer constitute a brightness adjustment circuit. The regulation level of the electronic potentiometer is 256 levels. The display brightness of the screen is changed through the voltage by controlling the electronic potentiometer and further adjusting the value of the VCOM voltage.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A drive board compatible with various miniature display screens is characterized by comprising a main board, wherein the main board can be connected with a daughter board, a daughter board interface is arranged on the main board, a coding and decoding circuit is arranged in the main board, and a signal conversion circuit is arranged in the daughter board;

2. The driving board compatible with various miniature display screens of claim 1, wherein the video codec chip generates a Pclk _1 clock signal, the clock crystal generates a Pclk _0 clock signal, the Pclk _1 clock signal and the Pclk _0 clock signal are both transmitted to the clock switching circuit, and the clock switching circuit can generate a Pclk _ out signal.

3. A driving board compatible with multiple types of micro display screens as claimed in claim 2, wherein the clock switching circuit comprises a high-speed switch chip, and the high-speed switch chip is used for switching the clock signals Pclk _1 and Pclk _ 0.

4. The driving board compatible with various micro display screens of claim 3, wherein the Pclk _1 clock signal is set as a system clock, the clock switching circuit receives the Pclk _1 clock signal and outputs a Pclk _ out clock signal, the Pclk _ out clock signal is transmitted to a daughter board, and the daughter board receives the video signal coded and decoded by the video coding and decoding chip and displays a video.

5. The driving board compatible with multiple micro display screens of claim 3, wherein the Pclk _0 clock signal is set as an external clock, the clock switching circuit receives the Pclk _1 clock signal and outputs a Pclk _ out clock signal, and the sub-board calls self-test data of an on-screen chip into a self-test mode.

6. The driver board compatible with various micro display screens of claim 3, wherein the clock switching circuit is switched by a key or a software command.

7. The driving board compatible with multiple microdisplays of claim 1, wherein the VCOM adjusting circuit is further connected with an electronic potentiometer, and the VCOM adjusting circuit and the electronic potentiometer form a brightness adjusting circuit.

8. A driver board compatible with multiple micro-displays according to claim 7, wherein the adjustment level of the electronic potentiometer is 256 levels.

9. The driving board compatible with multiple micro display screens of claim 1, wherein a codec chip is disposed in the daughter board, the daughter board output signals can be MIPI signals, LVDS signals, CVBS signals and SDI signals, and the codec chip of the daughter board corresponds to the daughter board output signals.

10. The drive board compatible with various micro display screens of claim 1, wherein the main board is provided with four positioning screw holes at the daughter board interface, the daughter board is provided with four mounting screw holes, the positioning screw holes are arranged corresponding to the mounting screw holes, and the daughter board is fixedly mounted through screws.