CN202838923U - A micro near-eye display interface drive control circuit structure - Google Patents

Abstract

A minitype near-eye display connector drive and control circuit structure comprises a red-green-blue (RGB) analog signal processing circuit module, a digital signal processing circuit module and a multi-potential output voltage source circuit module. The RGB analog signal processing circuit module comprises a video graphics array (VGA) interface connector and three analog video processing circuits with the same structure, wherein the three channel analog video processing circuits can be controlled to achieve amplification of analog signals and enhancement of drive capability. The digital signal processing circuit module comprises a complex programmable logic device (CPLD) and a crystal oscillator. According to the minitype near-eye display connector drive and control circuit structure, expensive and special chips used in a regular control-driven circuit, such as a picture decoding chip and a single chip microcomputer system chip, are eliminated, and therefore production cost is greatly reduced. Due to the fact that the CPLD is adopted as the core of the digital signal processing circuit module, the code of the CPLD can be amended appropriately to adapt to the resolution ratio of the digital signal processing circuit module, and generality of the minitype near-eye display connector drive and control circuit structure is improved.

Description

A micro near-eye display interface drive control circuit structure

technical field

The utility model belongs to the application technical field of a miniature near-eye display interface drive control circuit, in particular to a system that can achieve high system integration and meet the integrity and stability requirements of the display, and avoids the use of special video decoding integration The circuit is a miniature near-eye display interface drive control circuit structure that reduces the power consumption of the whole machine.

Background technique

The rapidly rising portable mobile communication and wireless display products in recent years have an increasing demand for color near-eye display systems. The inherent advantages of color near-eye display systems determine the development prospects of mobile display products. Among them, the driving circuit of the color near-eye display and its control display method are the key points. The display driving circuit of the existing analog color near-eye liquid crystal display adopts IC chips with various types of functions in order to realize more diverse and gorgeous functions. There are image decoding chips, display drive signal control chips, configuration single-chip microcomputer chips, display drive power amplifier op-amp modules, multi-power supply modules, passive configuration electronic components, etc. The circuit structure is relatively complicated, which leads to high cost of the whole system and system The high power consumption and the large space size of the whole machine weaken the advantages of low power consumption, small size and portability of the near-eye display.

Therefore, how to simplify the display driving circuit of the analog color near-eye display and give full play to the advantages of low power consumption, small size and portability of the near-eye display is an important research topic of the near-eye display technology at present.

Contents of the invention

The purpose of the utility model is to solve the problems that the circuit structure of the existing analog color near-eye liquid crystal display is relatively complicated, which leads to high cost of the whole system, high power consumption of the system, and large space size of the whole machine, and provides a kind of A miniature near-eye display interface drive control circuit structure that can meet the integrity and stability requirements of the display with high system integration and avoid the use of video-specific decoding integrated circuits to reduce the power consumption of the whole machine.

The micro near-eye display interface drive control circuit structure provided by the utility model includes: RGB analog signal processing circuit module, a digital signal processing circuit module that enables effective signal lines to be connected to the RGB analog signal processing circuit module through an operational amplifier, and a digital signal processing circuit module that is connected to the RGB analog signal processing circuit module respectively. The signal processing circuit module is connected with the digital signal processing circuit module and provides a multi-potential output voltage source chip with more than two required potentials.

The RGB analog signal processing circuit module includes: a VGA interface connector directly connected to the RGB output interface of the computer, the output end of the VGA interface connector is respectively provided with a red primary color analog output signal line, a green primary color analog output signal line, and a blue primary color analog output signal line. Primary color analog output signal line, initial horizontal synchronous signal output line, initial field synchronous signal output line; three analog video processing circuits with the same structure are respectively connected to red primary color analog output signal line, green primary color analog output signal line or blue primary color analog output signal line. The 3-channel analog video processing circuit can be controlled to complete the amplification of analog signals and the enhancement of drive capability.

The analog video processing circuit includes: at least one operational amplifier arranged on the same chip, and the enable port of at least one operational amplifier is connected to the operational amplifier enable signal line.

The multi-potential output voltage source chip is respectively supplied with an external power supply through a 4.5V DC voltage input line, provides electric energy to the CPLD through a 3.3V power line, provides electric energy to the RGB analog signal processing circuit module through a 10V power line, and drives through a constant current output The line provides a stable driving current for the LED light source of the analog color near-eye liquid crystal display.

The digital signal processing circuit module includes a CPLD and a crystal oscillator, and the crystal oscillator is connected to the CPLD through an output line of the crystal oscillator. The CPLD is connected to the RGB analog signal processing circuit module through the field synchronous signal output line and the horizontal synchronous signal output line, and is respectively connected to three analog video processing circuits with the same structure through the operational amplifier. The initial horizontal synchronous signal output line and the initial vertical synchronous signal output line are connected to the VGA interface connector.

Advantage and beneficial effect of the utility model:

(1) The production cost is reduced from two aspects: on the one hand, high-cost dedicated chips such as image decoding chips, display drive signal control chips, and single-chip microcomputer chips used in conventional control drive circuits are discarded; The PCB board of the drive circuit can be reduced from a 6-layer board to a 4-layer board, thereby greatly saving production costs;

(2) The reduction in the number of integrated circuit chips and the number of PCB board layers reduces the weight and space volume of the control drive circuit;

(3) Since the digital signal processing module with the CPLD as the core is used, the resolution of the analog color near-eye liquid crystal display can be different by appropriately modifying the code of the CPLD to adapt to its resolution, thereby enhancing the utility model. Versatility.

Description of drawings

Fig. 1 is the block diagram of a kind of miniature near-eye display interface drive control circuit structure of the present utility model;

in:

1: CPLD 2: Initial line synchronization signal output line

3: Crystal oscillator 4: Initial field synchronization signal output line

5: Blue primary color analog output signal line 6: VGA interface connector

7: Red primary color analog output signal line 8: Green primary color analog output signal line

9: 10V/3.3V dual power chip 10: Voltage source configuration circuit

11: Multi-potential output voltage source chip 12: Voltage division configuration circuit

13: 4.5V DC voltage input line 14: 3.3V voltage line

15: Constant current output drive line 16: 5V voltage line

17: 10V voltage line 18: Analog video operational amplifier circuit

20: Red primary color drive output line 22: Green primary color drive output line

24: Blue primary color drive output line 25: RGB analog signal processing circuit module

26: Vertical synchronization signal output line 27: Horizontal synchronization signal output line

28: Pixel clock signal output line 29: Operational amplifier enable effective signal line

31: Crystal oscillator output line 32: Digital signal processing circuit module.

Detailed ways

In order to further understand the invention content, features and effects of the utility model, the following examples are listed, and the structure of the micro near-eye display interface drive control circuit provided by the utility model is described in detail with reference to the accompanying drawings.

As shown in Figure 1, the miniature near-eye display interface drive control circuit structure of the present invention includes RGB analog signal processing circuit module 25, enables the digital signal that effective signal line 29 is connected with RGB analog signal processing circuit module 25 by op-amp The processing circuit module 32, and the multi-potential output voltage source chip 11 which is respectively connected to the RGB analog signal processing circuit module 25 and the digital signal processing circuit module 32 to provide more than two potentials and at least one constant current.

Described RGB analog signal processing circuit module 25 comprises: the VGA interface connector 6 that directly links to each other with the RGB output interface of computer, 3 analog video processing circuits 18 that link to each other with VGA interface connector 6 respectively. 3 channels The analog video processing circuit 18 can be controlled to amplify the analog signal and enhance the driving capability.

Described VGA interface connector 6 directly inserts the RGB output interface of computer; The output end of described VGA interface connector 6 is provided with and is respectively connected to the red primary color analog output on 18 channels of analog video processing circuits with 3 identical structures Signal line 7, green primary color analog output signal line 8, blue primary color analog output signal line 5, and initial horizontal synchronous signal output line 2 and initial field synchronous signal output line 4 connected to CPLD 1 at the same time.

The analog video processing circuit 18 includes at least one operational amplifier provided on the same chip, and the enable port of at least one operational amplifier is connected to the operational amplifier enable signal line 29 .

The multi-potential output voltage source chip 11 is respectively supplied with an external power supply through the 4.5V DC voltage input line 13, provides electric energy to the CPLD 1 through the 3.3V power line 14, and provides electric energy to the RGB analog signal processing circuit module 25 through the 10V power line 17 , Provide a stable driving current for the LED light source of the analog color near-eye liquid crystal display through the constant current output driving line 15 .

The digital signal processing circuit module 32 includes a CPLD (Complex Programmable Logic Device, complex programmable logic device) 1 and a crystal oscillator 3, and the crystal oscillator 3 is connected to the CPLD 1 through a crystal oscillator output line 31. The CPLD 1 has no less than 34 effective input/output pins, no less than 72 macro units, the operating frequency of the chip system can reach above 150MHz, and the chip power supply voltage is 3.3V.

Described CPLD 1 is connected with RGB analog signal processing circuit module 25 by field synchronous signal output line 26, line synchronous signal output line 27, enables effective signal line 29 respectively with 3 identical analog video signals of structure by described operational amplifier. The processing circuit 18 is connected to the VGA interface connector 6 through the initial horizontal synchronous signal output line 2 and the initial vertical synchronous signal output line 4 .

Claims (5)

1. miniature near-to-eye interface driver control circuit structure, it is characterized in that described circuit structure comprises: RGB analog signal processing circuit module, enable the digital signal processing circuit module that the useful signal line links to each other with RGB analog signal processing circuit module by amplifier, and link to each other with the digital signal processing circuit module with RGB analog signal processing circuit module respectively and required many current potentials output voltage source chip of current potential more than 2 kinds is provided.

2. circuit structure according to claim 1, it is characterized in that described RGB analog signal processing circuit module comprises: the VGA interface connector that directly links to each other with the RGB output interface of computing machine, the output terminal of VGA interface connector is respectively arranged with red primary analog output signal line, green primary analog output signal line, blue primary analog output signal line, and initial row synchronizing signal output line, initial fields synchronizing signal output line; 3 identical analog video treatment circuits of structure are connected respectively to red primary analog output signal line, green primary analog output signal line or blue primary analog output signal line.

3. circuit structure according to claim 2, it is characterized in that described analog video treatment circuit includes: be arranged at least 1 operational amplifier on the same chip, and the enable port of at least 1 operational amplifier enables the useful signal line with described amplifier and is connected.

4. circuit structure according to claim 1 is characterized in that described digital signal processing circuit module includes CPLD and crystal oscillator, and described crystal oscillator is connected to CPLD by the crystal oscillator output line; Described CPLD by field sync signal output line, line synchronizing signal output line be connected with RGB analog signal processing circuit module, by described amplifier enable the useful signal line respectively the analog video treatment circuit identical with 3 structures link to each other, link to each other with the VGA interface connector with initial fields synchronizing signal output line by initial row synchronizing signal output line.

5. circuit structure according to claim 1 is characterized in that described many current potentials output voltage source chip supplies with, electric energy is provided, electric energy is provided, provides stable drive current by the constant current output drive wire for the led light source of simulating color near-eye LCD to RGB analog signal processing circuit module by the 10V power lead to CPLD by the 3.3V power lead by 4.5V DC voltage input line external power supply respectively.

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