CN202473187U

CN202473187U - Row scanning driving platform of display screen

Info

Publication number: CN202473187U
Application number: CN2012200698556U
Authority: CN
Inventors: 蔡勇; 刘常富
Original assignee: Sichuan CCO Display Technology Co Ltd
Current assignee: Sichuan CCO Display Technology Co Ltd
Priority date: 2012-02-29
Filing date: 2012-02-29
Publication date: 2012-10-03
Anticipated expiration: 2022-02-28

Abstract

The utility model discloses a row scanning driving platform of a display screen. The driving platform comprises an encoding control unit, a digital decoding unit and a simulation decoding unit, wherein the encoding control unit is used for encoding a scanning output signal and outputting display data to column scanning lines of the display screen; the digital decoding unit is used for performing one-time digital decoding on an encoded signal; the simulation decoding unit is used for performing one-time simulation decoding on a digital signal which is subjected to digital decoding; and a scanning signal output by the simulation decoding unit through the simulation decoding is directly sent to row scanning lines of the display screen. According to the column scanning driving platform of the display screen, the number of pins (which are used for outputting scanning driving signals) of a programmable chip can be greatly reduced through encoding, decoding and re-decoding, and the flexibility of the scanning driving can be kept; and therefore, the row scanning driving platform can be used as a powerful support for the development of a high-performance display screen.

Description

A kind of display screen line turntable driving platform

Technical field

The utility model belongs to the display driver technical field, is specifically related to a kind of design of display screen line turntable driving platform.

Background technology

OLED (Organic Light-Emitting Diode) display screen is regarded as the novel planar display technique of tool potentiality of future generation, and it has possessed the incomparable advantage of many LCD.

One of core technology that actuation techniques shows as OLED be the key of successfully developing high-performance OLED, and the design of special-purpose drive IC often lags behind the exploitation of display screen far away, and expense is higher, becomes the factor of restriction OLED producer development.Therefore developing the designing technique of OLED drives platform and oneself grasp platform, for research OLED actuation techniques provides software and hardware to support, is one of prerequisite core competence of open OLED.

Following elder generation does an explanation to the OLED driving principle: show the same with the LCD plane; Image is delivered to the OLED screen by one one and is shown; For avoiding the display frame flicker, image must keep certain frequency, carries out (as shown in Figure 1) synchronously with synchronizing signal between field and field.To every field pattern image source, view data is sent to display screen by delegation of delegation, the row with in the ranks carry out synchronously with synchronizing signal.To every row figure image source, with regard to OLED, be expert at synchronously effectively after, sweep signal is (OLED basic pixel cell as shown in Figure 2) effectively, transistor T 1 conducting among Fig. 2, this makes the state of T2 determined by data line voltage.Capacitor C s makes that behind the end of scan electric capacity was accomplished the state after discharging and recharging when the T2 state remained on scanning.The structure of OLED pixel cell has determined that in every line scanning stage view data need all be sent to data line.After data line showed completion, the scanning of then carrying out next line showed, until the demonstration of accomplishing a field data.

By on can know that want driving OLED normally to show, control module must be accomplished the scanning to all OLED pixel columns in a field time, and in scan period, sees corresponding data off, with control display unit GTG.Therefore the driving of the OLED task of will accomplishing, the one, the sequential of gated sweep signal and data-signal, the one, generate driving OLED and show required voltage.The former is accomplished by digital circuit usually, and the latter is accomplished by mimic channel usually.

The driving voltage of OLED is generally about 10V; Data-signal and sweep signal are digital signal; And the voltage of digital signal is generally about 3V, so data-signal and sweep signal must pass through digital-to-analog conversion and level conversion, can show by the driving OLED display unit.OLED is driven task, after OLED screen maturation, can be accomplished by special chip, chip is the digital-to-analogue hybrid chip.But be in the exploitation OLED display screen stage, chip development lags behind, so numerical portion needs to be accomplished by programmable chip such as FPGA; Analog part adopts DC-DC to accomplish (programmable chip is as shown in Figure 3 with being connected of OLED screen) with D/A and some other mimic channels usually.Because control OLED scan lines displayed and data line are along with its amount of raising of screen resolution is very huge; Therefore after digital-to-analog circuit separated, its requirement to the programmable chip interface was very big, is the 320X240AMOLED display screen like resolution; 320 sweep traces are arranged, 720 data lines.If display unit has 256 gray scale variation; Be 8 by programmable chip to the data-signal of the D/A of every data lines output then, promptly 8 programmable chip pins drive a data lines, add the scanning pin; Drive this AMOLED screen; Required pin able to programme will reach 6080, and number of pins is more, realize complicated.Therefore, realize the driving of OLED display screen, must change driving method and platform, reduce driving required interface pin.

The utility model content

The purpose of the utility model is to drive the problems referred to above that exist in order to solve existing OLED display screen, has proposed a kind of display screen line turntable driving platform.

The technical scheme of the utility model is: a kind of display screen line turntable driving platform; Comprise coding control module, digit translation unit and analogy decode unit; Said coding control module is used for scanning output signal is encoded, and exports video data to the column scan line of display screen simultaneously; Said digit translation unit is to carrying out digit translation one time through encoded signals; The digital signal of said analogy decode unit after to digit translation carried out an analogy decode, and the sweep signal of the analogy decode output of analogy decode unit directly is sent to the horizontal scanning line of display screen.

Further, described coding control module is specifically realized through programmable chip.

Further, described digit translation unit is specifically realized through programmable chip.

Further, described analogy decode unit is specifically realized through ADG506A.

Further, described display screen is specially the OLED screen.

The beneficial effect of the utility model: the display screen line turntable driving platform of the utility model is through encoding, decipher, decipher the driving of accomplishing display screen; Can flexibly and effectively realize arbitrary dimension is driven arbitrarily the turntable driving of the display screen of requirement; Reduce the pin of programmable chip output scanning drive signal greatly; Simultaneously can keep the dirigibility of turntable driving again, thereby the exploitation of support high-performance display screen that can be strong.

Description of drawings

Fig. 1 is a plane displaying principle synoptic diagram.

Fig. 2 is basic active OLED pixel cell synoptic diagram.

Fig. 3 is existing programmable chip and the synoptic diagram that is connected of OLED screen.

Fig. 4 is the structural representation of the display screen line turntable driving platform of the utility model.

Fig. 5 is a kind of realization synoptic diagram of line scanning drives platform among the embodiment.

Fig. 6 is the structural representation of 320x240x3AOLED line scanning drives platform among the embodiment.

Fig. 7 is a 320x240x3AOLED line scanning drives platform digit translation synoptic diagram among the embodiment.

Embodiment

Below in conjunction with accompanying drawing and concrete embodiment the utility model is done further to set forth.

A kind of display screen line turntable driving platform of the utility model; Concrete synoptic diagram is as shown in Figure 4; Comprise coding control module, digit translation unit and analogy decode unit; Said coding control module is used for scanning output signal is encoded, and exports video data to the column scan line of display screen simultaneously; Said digit translation unit is to carrying out digit translation one time through encoded signals; The digital signal of said analogy decode unit after to digit translation carried out an analogy decode, and the sweep signal of the analogy decode output of analogy decode unit directly is sent to the horizontal scanning line of display screen.

The drives platform here simultaneously can keep the dirigibility of turntable driving again through the pin of encoding, deciphering, decoding can reduce programmable chip output scanning drive signal greatly again, thereby the exploitation of support high-performance display screen that can be strong.

Fig. 5 is a kind of realization synoptic diagram of line scanning drives platform, and here, the coding control module is specifically realized through programmable chip.Programmable chip configuration circuit and SDRAM are the peripheral circuit of programmable chip, at first in programmable chip, scanning output signal are encoded, and dwindle the pin of programmable chip to scanning output; To carrying out digit translation one time through encoded signals, again digital signal is carried out an analogy decode afterwards then, the sweep signal of analogy decode output directly is sent to OLED screen sweep trace, thereby accomplishes the turntable driving to the OLED screen.Those skilled in the art will appreciate that the display screen line scanning drive method here also can be used for the driving of other display screen.

The digit translation unit can be accomplished by programmable chip; The analogy decode unit can select to simulate MUX such as ADG506A accomplishes; If analogy decode unit output voltage can not satisfy the demand of OLED voltage, then can behind the analogy decode unit, increase level-conversion circuit.

The line scanning drives platform of the utility model not only greatly reduces in order to realize that the OLED ranks drive the output pin of the programmable chip of sequential; And realize easily: the programmable chip that is used to decipher can be exported the decoding state flexibly according to the selected device of analogy decode circuit.If the analogy decode circuit selects ADG506A to realize; ADG506A is 1 and enables to import 16 outputs of 4 state inputs that 320 tunnel scannings only need 20 ADG506A just can meet the demands; Its also just 100 inputs of maximum input; And concerning programmable chip, as long as number of pins meets the demands, the realization of decoding scheme is easily.When display resolution improves; The upgrading of this drives platform also is easy to, and brings up to 1024X768 like resolution, 1024 tunnel scannings; With 64 ADG506A; Its maximum input is that chip decoding able to programme is output as 320 the tunnel, selects the XILINX FPGA of company programmable chip XC3S1000-4fg456, has 456 I/O to be enough to satisfy the demands.Software to programmable chip is made an amendment slightly, and circuit is set type again and can be realized upgrading, and is much easier more than the exploitation chip.The line scanning drives platform of the utility model is owing to the use separation circuit is realized, so circuit is bigger, can be used as exploitation OLED and shield use when verifying, and after OLED screen maturation, will be no longer suitable.

As shown in Figure 6, be that the AMOLED display screen of 320X 240X 3 is an example with resolution, carry out turntable driving to this screen; Its programmable chip is all selected the FPGAXC3S1000-4fg456 of XILINX company, and fpga chip 1 is accomplished ranks and driven sequential, and to line scan signals coding output signal a [7:0], b [7:0], c [4:0]; In fpga chip 2; According to the demand of analogy decode circuit, accomplish decoding to signal a, b, c, its decoding block diagram is as shown in Figure 7.The signal of chip 2 outputs is sent to 20 ADG506A and carries out final 320 tunnel turntable driving that form of analogy decode, thereby accomplishes the driving to this screen.Can drive 320X 240X 3AMOLED through this line scanning drives platform of checking.

Those of ordinary skill in the art will appreciate that embodiment described here is in order to help the principle of reader understanding's the utility model, should to be understood that the protection domain of the utility model is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from the utility model essence according to disclosed these teachings of the utility model, and these distortion and combination are still in the protection domain of the utility model.

Claims

1. a display screen line turntable driving platform comprises coding control module, digit translation unit and analogy decode unit, and said coding control module is used for scanning output signal is encoded, and exports video data to the column scan line of display screen simultaneously; Said digit translation unit is to carrying out digit translation one time through encoded signals; The digital signal of said analogy decode unit after to digit translation carried out an analogy decode, and the sweep signal of the analogy decode output of analogy decode unit directly is sent to the horizontal scanning line of display screen.

2. described display screen line turntable driving platform according to claim 1 is characterized in that, described coding control module is specifically realized through programmable chip.

3. described display screen line turntable driving platform according to claim 1 and 2 is characterized in that, described digit translation unit is specifically realized through programmable chip.

4. described display screen line turntable driving platform according to claim 1 and 2 is characterized in that, described analogy decode unit is specifically realized through ADG506A.

5. described display screen line turntable driving platform according to claim 1 and 2 is characterized in that, described display screen is specially the OLED screen.