CN1987972B - Video driving system and method for organic light emitting diode display - Google Patents

Abstract

A video drive system for an organic light-emitting diode display, comprising a single-chip microcomputer control module, an external data storage module, an organic light-emitting diode display control module, and a power supply module; it is characterized in that it also includes: for converting differential image signals into R, Image data decoding module for G, B signals and field synchronization and line synchronization signals, the image signal at the input end of the driving system is connected to the decoding module through the DVI interface module, and is used to combine the R, G, B signals with field synchronization and line synchronization The signal is processed into an RGB image data signal core image processing module; the image data is constantly transmitted to the decoder through the DVI data line for decoding, and the decoded image data is processed by the core image processing module, and then the processed image data is transmitted to the organic The light-emitting diode display control module performs analog conversion, and finally inputs the analog signal into the organic light-emitting diode display to continuously display images.

Description

Video driving system and method for organic light emitting diode display

technical field

The invention relates to the technical field of organic electroluminescence, in particular to an online driving technology of a video organic light emitting diode (OLED) of an organic electroluminescence display screen. the

Background technique

At present, flat panel display devices are changing with each passing day. As a new member of flat panel display devices, the organic light-emitting diode display is still in the development stage in China, and the development of dynamic image driving circuits for this display device is also in its infancy in China. the

The existing organic light emitting diode dynamic display driving circuit and method can be briefly described as follows. The organic light-emitting diode dynamic display driving circuit includes a power supply module, a single-chip microcomputer control module, an external data storage module and an organic light-emitting diode display control module, and the organic light-emitting diode display control module drives the organic light-emitting diode display to emit light. The existing organic light-emitting diode dynamic display driving method is: the power supply module converts the 220V AC voltage of the AC mains into several DC voltages of different voltage values through a transformer and a voltage conversion chip, and supplies them to the single-chip microcomputer control module and the external data storage module respectively. and the OLED display control module for power supply; the single-chip microcomputer control module is the control unit of the drive circuit, and the data and programs are stored in the internal ROM of the single-chip microcomputer control module. The input interface of the image data of the PC and the drive circuit is connected together through the RS232 line; the image data is first written into the RAM cache in the single-chip microcomputer through the RS232 line, and then the image data is written into the external data storage module, and the single-chip control module converts the image The image data is read from the external data storage module in the form of 16 frames per second, written into the RAM cache of the single-chip microcomputer, and then the cached image data is transmitted to the organic light-emitting diode display control module, and the single-chip control module also sends the read, Write the control signal to control the organic light-emitting diode display module to work in coordination, and drive the organic light-emitting diode display to continuously display images at 16 frames per second. Due to the persistence of vision, the human eye feels that the picture it sees is dynamic. the

The disadvantage of the prior art is that the memory for storing image data and programs is a Flash memory, which is limited by the internal ROM storage capacity of the memory, and the amount of image data stored is very limited, usually only the image data of a section of dynamic image can be stored. Therefore, existing The dynamic image driving circuit and method of the organic light emitting diode display can only drive the organic light emitting diode display to repeatedly display a segment of dynamic images or characters, but cannot support the dynamic display of real-time online video image data. the

Contents of the invention

Aiming at the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a video drive system for an organic light emitting diode display screen capable of displaying dynamic images online. the

In order to solve the above-mentioned technical problems, a video drive system for an OLED display provided by the present invention includes:

A single-chip microcomputer control module, used for control processing of the drive system;

An external data storage module, connected to the single-chip microcomputer control module, used to drive the storage of system image signals;

An organic light-emitting diode display control module, connected to the single-chip microcomputer control module, for converting digital image signals into analog image signals;

A power supply module, used for power supply of the system;

It is characterized in that it also includes:

An image data decoding module, which is used to decode the differential image signal output from the DVI output port of the graphics card in the PC to convert it into R, G, B signals, field synchronization, and line synchronization signals, and drive the image signal at the input end of the system through the DVI interface The module is connected to the decoding module;

A core image processing module, connected to the single-chip microcomputer control module, is used to process the R, G, B signals and field synchronization and line synchronization signals into RGB image data signals of 128 × 128 pixels, and the decoding module passes the core The interface module of the image processing module is connected with the core image processing module;

The image data is constantly transmitted to the decoder through the DVI data line for decoding, and the decoded image data is processed by the core image processing module, and then the processed image data is transmitted to the organic light-emitting diode display control module for analog conversion, and finally The analog signal is input to the organic light-emitting diode display to continuously display images.

A video OLED dynamic image driving method of an organic electroluminescence display, characterized in that, the steps of operation:

1) Initialize the MCU control module and decoding module;

2) The image differential signal is output from the DVI output terminal of the graphics card in the PC, and sent to the decoding module through the DVI data transmission line and the DVI interface on the PCB; the decoding module decodes the input image differential signal into independent R, G, B signal and field sync, line sync signal;

3) The independent R, G, B signals and field synchronization and line synchronization signals are sent into the core image processing module through the interface module of the core image processing module, and under the control of the program, the image source is 800 * 600 resolution The high-rate image signal is converted to the RGB image signal with a resolution of 128×128 required by the display module;

4) Input the processed image signal into the organic light emitting diode display control module through the interface module between the core image processing module and the organic light emitting diode display control module; the organic light emitting diode display control module converts the data signal into an analog signal;

5) The analog signal is input into the organic light-emitting diode display screen to continuously display images; due to the persistence of vision, the human eye feels that the picture seen is dynamic. the

In step 5), the OLED display screen continuously displays images at 40 frames per second. the

Utilize the video driving system of the organic light-emitting diode display screen provided by the present invention, compared with the background technology, the present invention has the following advantages:

1) The drive circuit and method of the present invention can drive the organic light emitting diode display to play online moving pictures all the time, while the prior art can only drive the organic light emitting diode display to display a fixed dynamic image stored in the Flash memory. The disadvantage of the prior art is that the image data and programs are all stored in the Flash, and the stored dynamic images are limited by the capacity of the Flash, and can only be played heavily, and cannot be dynamically transmitted from time to time. The drive circuit and method of the present invention transmit the image data to the decoding module and the core image processing module from time to time through the DVI data line for processing, and at the same time transmit the processed image data to the organic light-emitting diode control module for analog conversion, reaching the final The organic light-emitting diode display shows a dynamic picture. Therefore, the organic light-emitting diode display can be driven to play active pictures online all the time, which is a step forward than simply playing a section of dynamic pictures repeatedly. the

2) The display function is powerful and supports multiple outputs,

In addition to the DVI digital video interface, the present invention is also provided with a VGA analog video interface. In this way, it can be compatible with a variety of graphics cards and support a variety of video output formats. It is only necessary to change the program of the FPGA to realize the conversion of various video signals without changing the hardware circuit. At the same time, if the TV signal receiving interface is expanded, the TV signal reception and conversion can be realized conveniently. In other words, the system actually has the basic functions of a complete monitor and a TV, which is equivalent to a small monitor or TV. And it is small in size, light in weight, powerful in function and widely used. the

3) Simple structure, using common components, low cost, easy to implement,

The drive circuit of the present invention has a simple structure, and the used components are common common parts in the market, and the cost is low and easy to implement. Full potential for mass production. the

4) It can fully demonstrate the characteristics of organic light-emitting diode displays,

The online video driver endows the organic light-emitting diode display drive circuit with the function of playing dynamic images from time to time, so that the characteristics of wide viewing angle, high contrast, high brightness, fast response, no tailing, and high lumen efficiency of the organic light-emitting diode display can be fully displayed . Therefore, the driving circuit of the present invention is particularly suitable for comprehensively testing the performance of the OLED display, so that the subsequent testing process of the OLED display device can be better realized. the

Description of drawings

Fig. 1 is the working principle figure of driving circuit of the present invention;

Fig. 2 is the circuit diagram of the decoder power module of drive circuit in the embodiment of the present invention;

Fig. 3 is the circuit diagram of the core image processing module power module of driving circuit in the embodiment of the present invention;

Fig. 4 is the circuit block diagram of the decoding module of driving circuit and core image processing module in the embodiment of the present invention;

Fig. 5 is a circuit diagram of the organic light emitting diode control module of the driving circuit in the embodiment of the present invention;

Fig. 6 is a flowchart of the operation of the driving circuit in the embodiment of the present invention. the

In the figure: FPGA is the core image processing module; OLED is organic light-emitting diode. the

Detailed ways

The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings, but the present embodiments are not intended to limit the present invention, and any similar structures and similar changes of the present invention should be included in the protection scope of the present invention. the

Referring to Fig. 1, a video drive system for an organic light emitting diode display provided by an embodiment of the present invention is connected to an FPGA processing module through a decoder for receiving image data, and the FPGA processing module is respectively connected to a ROM and an OLED display to control Module, the computer graphics card transmits the image data to the decoder from time to time through the DVI data line and the receiving image data unit for decoding. The decoded image data is processed in the core image processing module, and then the processed image data is transmitted to the OLED control module. The analog conversion is carried out in the middle, and finally the analog signal is input into the OLED display screen to continuously display the image. the

As shown in Figure 2 and Figure 3, the GND pin of the power conversion chip in the decoder power module (1) and the FPGA power module (2) is grounded, +5V input, +3.3V output, between the input terminal and output terminal and GND connected with a capacitor. the

As shown in Figure 4, a video OLED drive system for an organic electroluminescent display is composed of a decoder and an FPGA processing module. The input end of the OLED drive system is connected to the decoding module AD9xx2 through the DVI interface module COMECTORE, and the decoding module AD9xx2 is connected to the FPGA The interface module HEADER40 is connected to the first FPGA processing module XC2xxx, the first FPGA processing module XC2xxx is respectively connected to the first OLED control module interface HEADER40 and the second OLED control module interface HEADER40, and the second FPGA processing module XC2xxx is respectively connected to the second OLED control module interface HEADER40 and single-chip microcomputer control module C8051xxxx, OLED display control module (not shown in the figure) are respectively connected to single-chip microcomputer control module C8051xxxx and OLED display (not shown in the figure);

The decoding module is connected to the DVI interface module through wires and resistors, in which pin GND (1~21) and pin A in the decoding module are directly grounded; pin R_TERM is grounded through a resistor; pins REFBYPASS and MIDBYPASS are directly grounded through a capacitor; pin VD_<10~0>, VDD_0, VDD_1, PVD_<3~0>, VDD_2, VDD_3, VDD_4 are directly connected to VDD3.3V; pins SDA and SCL are connected to VDD3.3V through resistors; one end of the FILT pin is connected to a capacitor , and the other end is connected to 3.3V through resistors and capacitors; pins RX0-, RX0+, RX1-, RX1+, RX2-, RX2+, RXC- and RXC+ are respectively connected to DATA0-, DATA0+, DATA1 in the DVI interface module through resistors -, DATA1+, DATA2-, DATA2+, CLK- and CLK+ pins are connected;

The decoding module is connected to the first FPGA processor module through the lead wire through the interface module of the FPGA processor; part of the pins of the second FPGA processor module are connected to the single-chip control module, and other pins such as: TDI, PROG, INIT/P107 are connected to the The program download port is connected. The pins P70~P71, P74~P75, P81~P83, P86~P88 in the first FPGA processor module are respectively connected with the P1~P21 (subscript is an odd number) pin in the first OLED control module; the first FPGA The pins P89~P90, P91, P96, P97, P99, P101, P102, and P110 in the processor module are respectively connected to the pins P23~P39 (subscripts are odd numbers) in the interface of the first OLED control module; the first FPGA processes The pins P112~P113, P120~P123, P127, P133~P134, P138~P141, P48~P149, P151~P153, P65, P166 in the device module are respectively connected with the pins P2~P40 ( The subscript is an even number); the pins P168, P172~P175, P179~P181, P187~P188, P191~P195, P199~P202, P204~P205 in the first FPGA processor module are connected to the second OLED control module respectively Pins P1~P39 (subscripts are odd numbers) are connected; optional 20 I/O ports in the second FPGA processor module are connected to pins P2~P40 (subscripts are even numbers) in the interface of the second OLED control module ;

In the OLED display control module, the pins VDD, VDDIO, BS1 and BS2 are directly connected to the power supply of 3.3V; the pins VCC0 and VCC1 are connected to the power supply of 12V; the pin VCOMH is grounded through a capacitor; the pin IREF is grounded through a resistor; VSS1 is connected directly to ground. the

A dynamic image driving method for an organic electroluminescence display, characterized in that the steps of operation:

1) Initialize the microprocessor and decoding module;

2) The image differential signal is output from the DVI output terminal of the graphics card in the PC, and sent to the decoding module through the DVI data transmission line and the DVI interface on the PCB; the decoding module decodes the input image differential signal into independent R, G, B signal and field sync, line sync signal;

3) The independent R, G, B signals and field synchronization and line synchronization signals are sent into the core image processing module through the interface module with the core image processing module, and under the control of the program, the image source is 800 * 600 The resolution image signal is converted to the RGB image signal with a resolution of 128×128 required by the display module;

4) Input the processed image signal into the OLED control module through the interface module with the OLED control module; the OLED control module converts the data signal into an analog signal;

5) The analog signal is input into the OLED display screen to continuously display images at 40 frames per second. Due to the persistence of vision, people who see the displayed images feel that the picture they see is moving. the

Claims (3)

1. the video frequency driving system of an organic light-emitting diode (OLED) display screen comprises:

One single chip control module is used for the control and treatment of drive system;

One external data storage module connects described single chip control module, is used for the storage of drive system picture signal;

One organic light-emitting diode (OLED) display screen control module connects described single chip control module, is used for data image signal and converts analog picture signal to;

One power module is used for the power supply of system;

It is characterized in that, also comprise:

One image data decoding module, being used for the difference image signal of video card DVI output terminal output in the PC decoded makes it to convert to R, G, B signal and field synchronization, line synchronizing signal, and the drive system input end connects described decoder module through the DVI interface module;

One core image treatment module, connect described single chip control module, be used for described R, G, B signal and field synchronization, line synchronizing signal are processed into the rgb image data signal of 128 * 128 pixels, described decoder module is through being connected the core image treatment module with the interface module of core image treatment module;

View data transfers to demoder constantly through the DVI data line and decodes, decoded view data is handled in the core image treatment module, again the image data transmission of handling well is simulated conversion in the organic light-emitting diode (OLED) display screen control module, at last simulating signal is imported the continuous display image of organic light-emitting diode (OLED) display screen.

2. dynamic image driving method that uses the described video frequency driving system of claim 1 is characterized in that the method operation steps:

1) single chip control module and decoder module are carried out initialization;

2) the DVI output terminal output of image difference signal video card in the PC is sent in the decoder module through the DVI interface on DVI data line and the PCB; Decoder module becomes separately independently R, G, B signal and field synchronization, line synchronizing signal with the image difference signal decoding of sending into;

It is 3) described that independently R, G, B signal and field synchronization, line synchronizing signal are sent in the core image treatment module by the interface module of core image treatment module separately, under the control of program, be that to be converted to the needed resolution of display module be 128 * 128 RGB picture signal for the picture signal of 800 * 600 resolution with image source;

4) picture signal after will handling is imported in the organic light-emitting diode (OLED) display screen control module by the core image treatment module and the interface module of organic light-emitting diode (OLED) display screen control module; The organic light-emitting diode (OLED) display screen control module converts data-signal to simulating signal;

5) simulating signal is imported the continuous display image of organic light-emitting diode (OLED) display screen; Because persistence of vision makes that human eye perceives is dynamic to the finding picture.

3. dynamic image driving method according to claim 2 is characterized in that, in described step 5), described organic light-emitting diode (OLED) display screen is with the continuous display image of mode of per second 40 two field pictures.

Images