CN1648753A - Display unit - Google Patents
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- CN1648753A CN1648753A CN 200510052800 CN200510052800A CN1648753A CN 1648753 A CN1648753 A CN 1648753A CN 200510052800 CN200510052800 CN 200510052800 CN 200510052800 A CN200510052800 A CN 200510052800A CN 1648753 A CN1648753 A CN 1648753A
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- display unit
- display
- couples
- holding capacitor
- voltage
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- Liquid Crystal Display Device Control (AREA)
Abstract
The display unit is suitable for panel for display device, and the display panel has display array comprising at least one data line and one scan line. During displaying one frame, the voltages of video data are written in the display unit; and before the display panel is switched to display the next frame, the voltages of video data are discharged via the RC circuit inside the display unit, so that the display unit shows the single grey picture to avoid image tailing in showing dynamic images.
Description
Technical field
The present invention is relevant for a kind of display panel, and particularly relevant for a kind of display unit, it shows that earlier corresponding image then shows single gray level image, with the phenomenon of removal of images towing in a frame.
Background technology
Fig. 1 is the panel synoptic diagram of the known liquid crystal display of expression (Liquid crystal display) device.Panel 1 comprises data driver 10, scanner driver 11 and array of display 12.Many data line D of data driver 10 controls
1To D
n, and scanner driver 11 control multi-strip scanning line S
1To S
mArray of display 12 is by staggered in twos data line D
1To D
nAnd sweep trace S
1To S
mForm, and each staggered data line and sweep trace form a display unit, for example, data line D
1With sweep trace S
1Form display unit 100.Consult Fig. 2, the equivalent electrical circuit of display unit 100 (other display unit is also identical) comprises switching transistor T10, holding capacitor Cs10 and liquid crystal capacitor Clc10.
Scanner driver 11 is sent sweep signal in regular turn to sweep trace S
1To S
m, and make with the switching transistor of all display units in the conducting delegation only in a flash, and turn-off the switching transistor that other row is gone up all display units.2 of data drivers are according to view data to be shown, via data line D
1To D
n, send corresponding vision signal (gray-scale value) to the display unit of delegation.For instance, send sweep signal to sweep trace S when scanner driver 11
1The time, the switching transistor T10 conducting of display unit 100,10 of data drivers pass through data line D
1The vision signal of correspondence is sent in the display unit 100, and comes the voltage of stored video signal by memory capacitance Cs10.Liquid crystal molecule among the liquid crystal capacitor Clc10 then determines whether deflection according to the voltage of holding capacitor Cs10, make from the light of backlight module by or intercept light.
In the control of LCD display device, display unit uses keeps driving (hold-driving).Consult Fig. 3, keep to drive being meant that in showing a frame, unanimity is kept in the brightness of display unit (I).With the circuit operation viewpoint, promptly be during display frame F11, the voltage of holding capacitor Cs10 is kept definite value always, shows next frame F12 up to the LCD display device.Yet because the liquid crystal response time is lower than a frame period, therefore, when the voltage of the vision signal of frame F12 provided to holding capacitor Cs10, the voltage that is stored in holding capacitor Cs10 in frame F11 was eliminated as yet.Thus, when the LCD display device shows dynamic image, then can produce the phenomenon of image towing (overlap).
In addition, known Organic Light Emitting Diode shows that (also as shown in Figure 1, difference is in the circuit structure of display unit 100 and 400 for Organic Light Emitting Display, OLED) Zhuan Zhi panel and driving thereof.Consult Fig. 4, in its expression OLED device, the circuit structure of display unit 400.Display unit 400 comprises switching transistor T40, holding capacitor Cs40, driving transistors T41 and LED D40.In the control of OLED display device, also use and keep driving, therefore,, also can produce the phenomenon of image towing when the OLED display device shows dynamic image.
Summary of the invention
In view of this, in order to address the above problem, fundamental purpose of the present invention is to provide a kind of display unit, is applicable to the panel of display device, when display device shows dynamic image, the phenomenon of image towing can not take place.
For realizing above-mentioned purpose, the present invention proposes a kind of display unit, is applicable to display panel, and this display panel has array of display, and array of display is made of at least one data line and one scan line.This display unit comprises switch module, liquid crystal capacitor, holding capacitor and impedance component.Switch module has the control end that couples sweep trace, couples the input end of data line, and the output terminal that couples pixel electrode.Liquid crystal capacitor couples between pixel electrode and the common electrode.Holding capacitor couples between pixel electrode and the common electrode.Impedance component couples between pixel electrode and the common electrode.
The present invention also proposes a kind of display unit, is applicable to display panel, and this display panel has array of display, and array of display is made of at least one data line and one scan line.Display unit comprises switch module, holding capacitor, impedance component, driven unit and luminescence component.Switch module has the control end that couples sweep trace, couples the input end of data line, and the output terminal that couples node.Holding capacitor couples between node and the common electrode.Impedance component couples between node and the common electrode.Driven unit has the control end that couples node, couples the input end of first voltage source, and output terminal.Luminescence component couples between the output terminal and this common electrode of this driven unit.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows.
The panel synoptic diagram of the known LCD display device of Fig. 1 table.
Fig. 2 represents the equivalent circuit diagram of known display unit.
Fig. 3 is illustrated under the pattern of keeping, the brightness of display unit.
Fig. 4 represents the equivalent circuit diagram of known OLED display unit.
Fig. 5 represents the panel synoptic diagram of the LCD display device of first embodiment of the invention.
The change in voltage synoptic diagram of pixel electrode in Fig. 6 presentation graphs 5.
Fig. 7 represents the panel synoptic diagram of the OLED display device of second embodiment of the invention.
The change in voltage synoptic diagram of node N70 in Fig. 8 presentation graphs 7.
Symbol description:
1,5,7～panel; 10,50,70～data driver; 11,51,71～scanner driver; 12,52,72～array of display; 100,400,500,700～display unit; 501,701～switch module; 502,702～impedance component; 703～driven unit; 704～luminescence component; Cs10, Cs40, Cs50, Cs70～holding capacitor; Clc10, Clc50～liquid crystal capacitor; CE～common electrode; D
1... D
n～data line; D40, D70～light emitting diode; PE～pixel electrode; R50, R70～resistor; S
1... S
m～sweep trace; T10, T40, T41, T50, T70, T71～transistor; Vdd～voltage source;
Embodiment
First embodiment:
Fig. 5 is the panel synoptic diagram of expression LCD display device of the present invention, and panel 5 is not for there being dark (normally black) pattern of electricity.Panel 5 comprises data driver 50, scanner driver 51 and array of display 52.Many data line D of data driver 50 controls
1To D
n, and scanner driver 51 control multi-strip scanning line S
1To S
mArray of display 52 is by staggered in twos data line D
1To D
nAnd sweep trace S
1To S
M instituteForm, and each staggered data line and display unit of sweep trace formation, for example, data line D
1With sweep trace S
1Form display unit 500.Consult Fig. 5, the equivalent electrical circuit of display unit 500 (other display unit is also identical) comprises switch module 501, holding capacitor Cs50, liquid crystal capacitor Clc50 and impedance component 502.In the present embodiment, switch module 501 realizes with transistor T 50, and in other words, the grid of transistor T 50, drain electrode and source electrode are respectively as control end, input end and the output terminal of switch module 501.502 of impedance components are realized with resistor R 50.
The grid of transistor T 50 couples sweep trace S
1, its drain electrode couples data line D
1, its source electrode couples pixel electrode PE (pixel electrode).Liquid crystal capacitor Clc50 is coupled between pixel electrode PE and the common electrode CE (common electrode).Holding capacitor Cs50 is coupled between pixel electrode PE and the common electrode CE.Resistor R 50 is coupled between pixel electrode PE and the common electrode CE.Wherein, common electrode CE has voltage Vcom.
When showing a frame, when the LCD display device was in scan period, scanner driver 51 output scanning signals were to sweep trace S
1, transistor T 50 thereby conducting.Then, during the LCD display device entered and writes, 50 of data drivers passed through data line D
1The vision signal of correspondence is sent in the display unit 500, and comes the data voltage Vdata of stored video signal by holding capacitor Cs50, in other words, the voltage Vpx of pixel electrode PE equals voltage (Vcom+Vdata).The liquid crystal molecule of liquid crystal capacitor Clc50 is then according to voltage Vdata and deflection.In an embodiment of the present invention, because liquid crystal capacitor Clc50, holding capacitor Cs50 and resistor R 50 are combined into the RC circuit, therefore, holding capacitor Cs50 begins discharge, and institute's stored voltage is begun to descend by voltage Vdata, and last holding capacitor Cs50 institute stored voltage equals 0 volt.In other words, promptly be that the voltage Vpx of pixel electrode PE begins to be discharged to voltage Vcom by voltage (Vcom+Vdata).The liquid crystal molecule of liquid crystal capacitor Clc50 then returns to original state.
Consult Fig. 6 and Fig. 5, when display frame F51, because memory capacitance Cs50 charging, voltage Vpx promotes and is voltage (Vcom+Vdata).Then, because the RC circuit that liquid crystal capacitor Clc50, holding capacitor Cs50 and resistor R 50 are combined into, voltage Vpx begins to be discharged to voltage Vcom by voltage (Vcom+Vdata).Voltage Vpx drops to time of voltage (Vcom+0.368Vdata) by voltage (Vcom+Vdata), is determined by liquid crystal capacitor Clc50, holding capacitor Cs50 and resistor R 50.On time τ, voltage Vpx equals voltage (Vcom+0.368Vdata), consults Fig. 6, and time τ is represented by following formula:
τ＝r50×(clc50+cs50)
Wherein, r50 represents the value of resistor R 50, and clc50 represents the value of liquid crystal capacitor Clc50, and cs50 represents the value of holding capacitor Cs50.
As implied above, because when display frame F51, the voltage Vdata of holding capacitor Cs50 elder generation stored video signal, and the last Cs50 of holding capacitor discharges fully and do not have a storage voltage, promptly the voltage Vpx of pixel electrode PE reduces and equals the voltage Vcom of common electrode CE at last.Therefore, before display frame F52, the liquid crystal molecule in the liquid crystal capacitor Clc does not have deflection, makes pixel cell 500 show black image (single gray level image).Thus, when panel 5 switches to display frame F52, the phenomenon that dynamic images displayed can not be pulled.
Similarly, when display frame F52, the above-mentioned program that discharges and recharges also can take place in the memory capacitance Cs50 in the pixel cell 500.Different is that the voltage Vdata of vision signal is a negative value, consults Fig. 6.This be because, in the LCD panel, be subjected to single polarity electric field bias constantly in order to prevent liquid crystal molecule, cause the liquid crystal molecule life-span brief, therefore,, when odd-numbered frame and even frame, be the vision signal that receives reverse polarity respectively with regard to single display unit.
Second embodiment:
Fig. 7 represents the panel synoptic diagram of OLED display device of the present invention.Panel 7 comprises data driver 70, scanner driver 71 and array of display 72.Many data line D of data driver 70 controls
1To D
n, and scanner driver 71 control multi-strip scanning line S
1To S
mArray of display 72 is by staggered in twos data line D
1To D
nAnd sweep trace S
1To S
mForm, and each staggered data line and sweep trace form a display unit, for example, data line D
1With sweep trace S
1Form display unit 700.Consult Fig. 7, the equivalent electrical circuit of display unit 700 (other display unit is also identical) comprises switch module 701, holding capacitor Cs70, impedance component 702, driven unit 703 and luminescence component 704.In the present embodiment, switch module 701 realizes with transistor T 70, and in other words, the grid of transistor T 70, drain electrode and source electrode are respectively as control end, input end and the output terminal of switch module 701.Driven unit 703 realizes with transistor T 71, and in other words, the grid of transistor T 71, drain electrode and source electrode are respectively as control end, input end and the output terminal of driven unit 703.702 of impedance components are realized with resistor R 70.Luminescence component 704 is realized with LED D70.
The grid of transistor T 70 couples sweep trace S
1, its drain electrode couples data line D
1, its source electrode couples node N70.Holding capacitor Cs70 is coupled between node N70 and the common electrode CE.Resistor R 70 is coupled between node N70 and the common electrode CE.Wherein, common electrode CE has voltage Vcom.The grid of transistor T 71 couples node N70, with and drain electrode couple power supply Vdd.LED D70 is coupled between the source electrode and common electrode CE of transistor T 71.
When showing a frame, when the OLED display device was in scan period, scanner driver 71 output scanning signals were to sweep trace S
1, transistor T 70 thereby conducting.Then, during the OLED display device entered and writes, 70 of data drivers passed through data line D
1The vision signal of correspondence is sent in the display unit 700, and comes the data voltage Vdata of stored video signal by holding capacitor Cs70, in other words, the voltage V70 of node N70 equals voltage (Vcom+Vdata).At this moment, transistor T 71 is according to voltage (Vcom+Vdata) and conducting and to produce drive current I70 luminous with driving LED D70.In an embodiment of the present invention, because holding capacitor Cs70 and resistor R 70 are combined into the RC circuit, therefore, holding capacitor Cs70 begins discharge, and institute's stored voltage is begun to descend by voltage Vdata, and last holding capacitor Cs70 institute stored voltage equals 0 volt.In other words, promptly be that the voltage V70 of node N70 begins to be discharged to voltage Vcom by voltage (Vcom+Vdata).As voltage V70 during less than the threshold voltage of transistor T 71, transistor T 71 turn-offs, and LED D70 stops luminous.
Consult Fig. 7 and Fig. 8, when display frame F71, because memory capacitance Cs70 charging, voltage V70 promotes and is voltage (Vcom+Vdata).Then, because the RC circuit that holding capacitor Cs70 and resistor R 70 are combined into, voltage V70 begins to be discharged to voltage Vcom by voltage (Vcom+Vdata).Voltage V70 drops to time of voltage (Vcom+0.368Vdata) by voltage (Vcom+Vdata), is determined by holding capacitor Cs70 and resistor R 70.On time τ, voltage V70 equals voltage (Vcom+0.368Vdata), consults Fig. 8, and time τ is by representing with following formula:
τ＝r70×cs70
Wherein, r70 represents the value of resistor R 70, and cs70 represents the value of liquid crystal capacitor Cs70.
As implied above, because when display frame F71, the voltage Vdata of holding capacitor Cs70 elder generation stored video signal, and holding capacitor Cs70 discharges fully at last and do not have a storage voltage, promptly the voltage V70 of node N70 reduces and equals the voltage Vcom of common electrode CE at last.Therefore, before display frame F72, transistor T 71 shutoffs and LED D70 stop luminous, make pixel cell 700 show black images.Thus, when panel 7 switches to display frame F52, the phenomenon that dynamic images displayed can not be pulled.
Similarly, when display frame F72, the above-mentioned program that discharges and recharges also can take place in the memory capacitance Cs70 in the pixel cell 700.Before display frame F73, transistor T 71 shutoffs and LED D70 stop luminous, make pixel cell 700 show black images.
According to LCD display device of the present invention and OLED display device, when showing a frame, display unit shows corresponding image earlier, and before display device shows next frame, because the RC circuit in it makes holding capacitor discharge, and display unit shows black image.Thus,, LCD display device of the present invention and OLED display device keep driving though using, when showing dynamic image, and the phenomenon that can not pull still.
Though the present invention with preferred embodiment openly as above; right its is not that any those skilled in the art are under the situation that does not break away from the spirit and scope of the present invention in order to qualification the present invention; can change and modification, so protection scope of the present invention is as the criterion with the claim institute restricted portion that is proposed.
Claims (20)
1. a display unit is applicable to a display panel, and this display panel has an array of display, and this array of display is made of at least one data line and one scan line, and this display unit comprises:
One switch module has a control end that couples this sweep trace, couples an input end of this data line, and an output terminal that couples a pixel electrode;
One liquid crystal capacitor couples this pixel electrode and uses between the electrode altogether;
One holding capacitor couples between this pixel electrode and this common electrode; And
One impedance component couples between this pixel electrode and this common electrode.
2. display unit as claimed in claim 1, wherein, when this display panel showed one first frame, this holding capacitor was stored a data voltage, then began discharge by this data voltage.
3. display unit as claimed in claim 2, wherein, before this display panel showed to be connected in one second frame of this first frame, this holding capacitor institute stored voltage was discharged to 0 volt.
4. display unit as claimed in claim 2, wherein, this liquid crystal capacitor, this holding capacitor is combined into the RC circuit with this impedance component.
5. display unit as claimed in claim 4, wherein, this impedance circuit comprises a resistor.
6. display unit as claimed in claim 1, wherein, in one write during, this holding capacitor is stored a data voltage, and then begins discharge by this data voltage.
7. display unit as claimed in claim 6, wherein, during the one scan before during this writes, this switch module conducting.
8. display unit as claimed in claim 6, wherein, this liquid crystal capacitor, this holding capacitor is combined into the RC circuit with this impedance component.
9. display unit as claimed in claim 8, wherein, this impedance circuit comprises a resistor.
10. a display unit is applicable to a display panel, and this display panel has an array of display, and this array of display is made of at least one data line and one scan line, and this display unit comprises:
One switch module has a control end that couples this sweep trace, couples an input end of this data line, and an output terminal that couples a node;
One holding capacitor couples this node and uses between the electrode altogether;
One impedance component couples between this node and this common electrode;
One driven unit has a control end that couples this node, couples an input end of a voltage source, and an output terminal; And
One luminescence component couples between the output terminal and this common electrode of this driven unit.
11. display unit as claimed in claim 10, wherein, when this display panel showed one first frame, this holding capacitor was stored a data voltage, then began discharge by this data voltage.
12. display unit as claimed in claim 11, wherein, before this display panel showed to be connected in one second frame of this first frame, this holding capacitor institute stored voltage was discharged to 0 volt.
13. display unit as claimed in claim 11, wherein, this driven unit is a transistor.
14. display unit as claimed in claim 11, wherein, this holding capacitor and this impedance component are combined into the RC circuit.
15. display unit as claimed in claim 14, wherein, this impedance circuit comprises a resistor.
16. display unit as claimed in claim 10, wherein, in one write during, this holding capacitor is stored a data voltage, and then begins discharge by this data voltage.
17. display unit as claimed in claim 16, wherein, during the one scan before during this writes, this switch module conducting.
18. display unit as claimed in claim 16, wherein, this driving circuit is a transistor.
19. display unit as claimed in claim 16, wherein, this holding capacitor and this impedance component are combined into the RC circuit.
20. display unit as claimed in claim 19, wherein, this impedance circuit comprises a resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510052800 CN1648753A (en) | 2005-03-11 | 2005-03-11 | Display unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510052800 CN1648753A (en) | 2005-03-11 | 2005-03-11 | Display unit |
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|---|---|
| CN1648753A true CN1648753A (en) | 2005-08-03 |
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|---|---|---|---|
| CN 200510052800 Pending CN1648753A (en) | 2005-03-11 | 2005-03-11 | Display unit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461248C (en) * | 2005-09-29 | 2009-02-11 | 中华映管股份有限公司 | Shared voltage modification circuit and method |
| CN105388648A (en) * | 2015-12-25 | 2016-03-09 | 上海创功通讯技术有限公司 | Liquid crystal display and discharging circuit thereof |
| CN107464537A (en) * | 2017-08-18 | 2017-12-12 | 深圳市华星光电技术有限公司 | Driving method for liquid crystal display panel |
| CN107589575A (en) * | 2017-09-30 | 2018-01-16 | 联想(北京)有限公司 | Display screen |
| WO2019184449A1 (en) * | 2018-03-27 | 2019-10-03 | 京东方科技集团股份有限公司 | Control circuit, test equipment and test method for liquid crystal display panel |
-
2005
- 2005-03-11 CN CN 200510052800 patent/CN1648753A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100461248C (en) * | 2005-09-29 | 2009-02-11 | 中华映管股份有限公司 | Shared voltage modification circuit and method |
| CN105388648A (en) * | 2015-12-25 | 2016-03-09 | 上海创功通讯技术有限公司 | Liquid crystal display and discharging circuit thereof |
| CN105388648B (en) * | 2015-12-25 | 2018-10-12 | 上海创功通讯技术有限公司 | Liquid crystal display and its discharge circuit |
| CN107464537A (en) * | 2017-08-18 | 2017-12-12 | 深圳市华星光电技术有限公司 | Driving method for liquid crystal display panel |
| CN107589575A (en) * | 2017-09-30 | 2018-01-16 | 联想(北京)有限公司 | Display screen |
| WO2019184449A1 (en) * | 2018-03-27 | 2019-10-03 | 京东方科技集团股份有限公司 | Control circuit, test equipment and test method for liquid crystal display panel |
| CN110310608A (en) * | 2018-03-27 | 2019-10-08 | 京东方科技集团股份有限公司 | Control circuit, test equipment and the test method of liquid crystal display panel |
| US10991323B2 (en) | 2018-03-27 | 2021-04-27 | Hefei Xinsheng Optoelectronics Technology Co., Ltd. | Control circuit, testing apparatus and method for liquid crystal display panel |
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