CN101201517A

CN101201517A - Driving circuit for active matrix liquid crystal display device

Info

Publication number: CN101201517A
Application number: CNA2007101957265A
Authority: CN
Inventors: 山下佳大朗
Original assignee: Toppoly Optoelectronics Corp
Current assignee: TPO Displays Corp
Priority date: 2006-12-13
Filing date: 2007-12-13
Publication date: 2008-06-18
Also published as: TW200826056A; JP2008145921A

Abstract

The invention provides an active matrix display device which is used for reducing the quantity of displacement register in a gate driver. The invention comprises a pixel matrix which is formed by arranging a plurality of pixels in a matrix shape of N sections*P rows*Y arrays; a source driver for driving a data line connected with the pixel TFT source end of each pixel; and a gate driver for driving a scanning line connected with the pixel TFT source end of each pixel, wherein, the gate driver, in each section, comprises at least one displacement register and N*P gate control elements. The output line of the displacement register in each section is connected with the input end of the P gate control elements in each section so as to output a plurality of gate controlled pulses.

Description

The driving circuit that is used for active matrix type display

Technical field

The present invention is relevant for the driving circuit of a kind of active array type (active matrix) display device, particularly a kind of can dwindling in order to driving the driving circuit of each pixel, and enlarge the active matrix type display of effective display area.

Background technology

Disposed two parallel transparency carriers in the liquid crystal indicator, then be provided with pixel electrode on the face of its subtend, the crack then disposes liquid crystal layer between two transparency carriers.In liquid crystal indicator, active array type LCD is that pixel electrode is come represent pixel with rectangular configuration, on the other hand, then disposes the on-off element that is used for conducting (on) or turn-offs (off) near each pixel electrode on the transparency carrier.

Fig. 3 is the structural drawing of known active array type LCD.Followingly according to this figure the structure and the operation of known liquid crystal indicator are described, wherein liquid crystal panel 1 is the active array type liquid crystal panel, has pixel electrode 30, scan signal line 31, data signal line 32, on-off element 33 and counter electrode 34.

Pixel electrode 30 is the electrodes that are configured to matrix shape on line direction and column direction.Scan signal line 31 is in order to selecting the scan signal line of unidirectional pixel, and at the line direction that is prolonging liquid crystal panel p bar scan signal line is set.Data signal line 32 is to be used for transmitting on the pixel on the same column direction according to video data applying the data signal line of voltage, and the column direction that is prolonging liquid crystal panel is provided with q bar data signal line.On-off element 33 is according to sweep signal the data of data signal line to be sent to the on-off element of the pixel of liquid crystal cells, and for example (Thin Film Transistor TFT) constitutes by thin film transistor (TFT).Counter electrode 34 is to be used to provide the electrode of common voltage to each liquid crystal cells.Liquid crystal cells is clipped between pixel electrode 30 and the counter electrode 34.Clip liquid crystal cells between one group of pixel electrode 30 and the counter electrode 34.The liquid crystal cells that is clipped by one group of pixel electrode 30 and counter electrode 34 is called pixel.

Be by the voltage that applies between pixel electrode 30 and the counter electrode 34 in the liquid crystal cells, reach the function of regulating optical shutter.Pixel then is divided into RGB regularly, and in counter electrode 34 sides the chromatic filter of RGB is set, and the light of synthetic RGB identifies colored image in people's eyes.According to the configuration of pixel RGB, data line 32 can be divided into the RGB data line.

Gate drivers 2 be on liquid crystal panel 1 interscan signal wire 31, apply in regular turn p sweep signal X1, X2 ..., the circuit of Xp.Source electrode driver 3 is the voltage that applies that produces on the data signal line 32 in liquid crystal panel 1 corresponding to video data, with these voltages be output into picture element signal Y1, Y2 ..., the circuit of Yq.4 of signal processing circuits receive picture signal from the outside, for source electrode driver 3 output video datas, and for gate drivers 2 and source electrode driver 3 output control signals.

The then operation of explanation display image on liquid crystal panel 1.Signal processing circuit 4 is utilized control signal control gate driver 2, applies sweep signal on the scan signal line 31 of any row of liquid crystal panel 1.So the on-off element 33 of this journey is conducting (on) state, conducting between each column data line 32 and the pixel electrode 30.Signal processing circuit 4 then provides to source electrode driver 3 in advance for the required data of each row pixel on the row that sweep signal is provided.Therefore, source electrode driver 3 on-off element 33 be conducting state during, convert video data to each pixel electrode 30 applying voltage and export.Therefore, the order of the most up (i=1) to the most descending (i=p) of 4 foundations of signal processing circuit such as liquid crystal panel 1 scans, and provides video data for whole pixel electrodes 30.

The structure of gate drivers 2 then, is described with reference to figure 2.One

section shift register

22a, 22b, each output line of 22c, 22d are connected respectively to the input terminal with door (AND) 25a, 25b, 25c, 25d.Each then is connected individually with another input terminal of door enables

signal wire

24a, 24b, 24c, 24d.Each is connected to

impact damper

26a, 26b, 26c, 26d respectively with the lead-out terminal of

door

25a, 25b, 25c, 25d.Therefore, owing to

door

25a, 25b, 25c,

25d shift register

22a, 22b, 22c, 22d are set corresponding to each, make that the area of shift register is bigger,, relatively can cause the ratio of image area to descend so the usable floor area of gate drivers also can be bigger.

Summary of the invention

In view of this, the objective of the invention is in the gate drivers of active matrix type display, reduce the usable floor area of shift register, and then reduce the ratio of gate drivers usable floor area in device.By this, just can reach equipment miniaturization, expanded view as display area and the purpose that reduces cost.

In the gate drivers of active matrix type display, configuration to the shift register of each gating element is that each section (the N section is all arranged) that constitutes for a plurality of gating elements concentrated setting, so the sum of shift register can be reduced to 1/P.

Concrete structure of the present invention is as described below:

(1) in active matrix type display of the present invention, comprise by the picture element matrix that matrix shape disposed of a plurality of pixels according to the capable Y row of N section * P, be connected to the source electrode driver of the data line of pixel TFT source terminal in described each pixel in order to driving, and the gate drivers that is connected to the sweep trace of described pixel TFT gate terminal in order to driving, wherein gate drivers comprises at least one shift register in each section, and comprise N * P gating element, the output line of the shift register of described each section is connected to the input end of P described gating element in described each section, to export a plurality of gating pulses.

(2) as (1) active matrix type display in, described gate drivers can be according to descending order or reverse sequence drive each pixel column gradually.

(3) as (1) or the active matrix type display of (2) in, can drive according to random order.

(4) as (1) in (3) in the arbitrary active matrix type display, described gating element is and door (AND).

The invention effect

Gate drivers of the present invention can be deleted over tediously long shift register quantity in the gate drivers, and can dwindle layout area, with this purpose that reaches the miniaturization of active matrix type display and dwindle the display frame.

In addition, be not only general normal or reverse type of drive,, can reach the purpose of arbitrary scan by the selecting sequence that line is enabled in change.

Description of drawings

Fig. 1 represents the synoptic diagram of the gate drivers embodiment of active matrix type display of the present invention.

Fig. 2 represents the synoptic diagram of the gate drivers example of known active matrix type display.

Fig. 3 represents the structural drawing of known active array type LCD.

The main element symbol description

The 1-liquid crystal panel;

The 2-gate drivers;

The 3-source electrode driver;

The 4-signal processing circuit;

The 11-shift register;

12-carry incoming line;

13-shift register output line;

14a-enables line;

14b-enables line;

14c-enables line;

14d-enables line;

15a-and door;

15b-and door;

15c-and door;

15d-and door;

The 16a-impact damper;

The 16b-impact damper;

The 16c-impact damper;

16d-grid impact damper;

17a-grid output line;

17b-grid output line;

17c-grid output line;

17d-grid output line;

The 22a-shift register;

The 22b-shift register;

The 22c-shift register;

The 22d-shift register;

25a-25d-and door;

The 26a-26d-impact damper;

The 30-pixel electrode;

The 31-scan signal line;

The 32-data signal line;

The 33-on-off element;

The 34-counter electrode.

Embodiment

The present invention is described in detail according to embodiment shown below.Yet this is an example only, is not to limit embodiment for this reason in order to limit scope of the present invention.

As shown in Figure 1, the output line 13 of shift register 11 is connected to 4 input ends with door 15a, a 15b, 15c and 15d in each section.Then be connected respectively to another input end of door and else enable

line

14a, 14b, 14c and 14d.In addition, be connected

impact damper

16a, 16b, 16c and 16d respectively with the output terminal of

door

15a, 15b, 15c and 15d.The output of described buffer circuit is connected respectively to

gate line

17a, 17b, 17c and 17d.Carry (carry) signal 12 that shift register 11 receives from leading portion.At this, when shift register 11 is active state, be high level (HI) with a square end of door in order to make in this section each, enable and be high level on the line, make data line 17 be active state by impact damper.Enabling pulse is to be input to 14a, 14b, 14c and 14d in regular turn, makes

gate line

17a, 17b, 17c and 17d selected in regular turn.Clock signal be input to shift register, finish the driving of this section thereafter.

In described embodiment,, obviously can also be applicable to the situation of other gating elements, for example rejection gate (NOR) though be that situation with door illustrates with gating element.

In addition, in described embodiment, be to carry out though enable the driving order of line, yet a plurality of above gate line drivings can be changed in proper order in same section to rise gradually or to descend gradually, by the mode of driving order in the change adjacent segment, can reach the effect of arbitrary scan.

In addition, in described embodiment,, obviously can also be applicable to the situation of other gating elements, for example rejection gate (NOR) though be that situation with door illustrates with gating element.

Though the present invention with preferred embodiment openly as above, so it is not in order to limit the present invention.Those of ordinary skill under any in the technical field under the situation that does not break away from the spirit and scope of the present invention, can carry out various changes and modification.Therefore, protection scope of the present invention is as the criterion with the scope of the claim that proposed.

Claims

1. active matrix type display, it comprises:

Picture element matrix, the matrix shape that is listed as by the capable Y of a plurality of pixel basis N section * P is disposed;

Source electrode driver is connected to the data line of pixel TFT source terminal in described each pixel in order to driving; And

Gate drivers is connected to the sweep trace of described pixel TFT gate terminal in order to driving;

Wherein said gate drivers comprises at least one shift register in each section, and comprises N * P gating element, and the output line of the shift register of described each section is connected to the input end of P described gating element in described each section, to export a plurality of gating pulses.

2. active matrix type display as claimed in claim 1, wherein said gate drivers is according to descending order or reverse sequence drive each pixel column gradually.

3. active matrix type display as claimed in claim 1 or 2, wherein said gate drivers drives according to random order.

4. active matrix type display as claimed in claim 1, wherein said gating element are and door (AND).