CN101776825B - Liquid crystal display and pixel unit thereof - Google Patents
Liquid crystal display and pixel unit thereof Download PDFInfo
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- CN101776825B CN101776825B CN2009100022226A CN200910002222A CN101776825B CN 101776825 B CN101776825 B CN 101776825B CN 2009100022226 A CN2009100022226 A CN 2009100022226A CN 200910002222 A CN200910002222 A CN 200910002222A CN 101776825 B CN101776825 B CN 101776825B
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Abstract
The invention provides a liquid crystal display (LCD) monitor and a pixel unit thereof, wherein the pixel unit is suitable to be electrically connected with a data line, a first scanning line and a second scanning line, the pixel unit contains a first sub-pixel unit and a second sub-pixel unit; the first sub-pixel unit is used to form a first switching element which is electrically connected with the data line, and a first liquid crystal capacitor and a first storage capacitor which are electrically connected with the first switching element; the second sub-pixel unit is used to form a second switching element which is electrically connected with the first switching element, a coupling capacitor, and a second liquid crystal capacitor and a second storage capacitor which are electrically connected with the second switching element; and the coupling capacitor is electrically connected between a first output/input end and a second output/input end of the second switching element, and the control end of the first switching element and the control end of the second switching element are separately electrically connected the first scanning line and the second scanning line.
Description
Technical field
The present invention particularly has the LCD and the pixel cell thereof of V-T characteristic curve separately about a kind of LCD and pixel cell thereof about a kind of zones of different of pixel cell.
Background technology
Fig. 1 is a pixel cell equivalent circuit diagram of known LCD.One pixel cell 110 of LCD has one first pixel cell 111 and one second pixel cell 112 simultaneously; And it is as shown in Figure 1; Known designs utilizes two thin film transistor (TFT) T1 and T2 to control the change in voltage of first pixel cell 111 and second pixel cell 112 respectively, makes first pixel cell 111 and second pixel cell 112 obtain preferable optic response through other γ calibration curve.
Fig. 2 is the block scheme of the driving framework of display driver Fig. 1 embodiment LCD schematically.As shown in Figure 2, this driving framework 100 comprises a thin film transistor (TFT) array 102, one first view data driving circuit 104, one second view data driving circuit 106, and one scan signal drive circuit 108.Please be simultaneously with reference to figure 1 and Fig. 2, scan signal drive circuit 108 produces sweep signal, couples the grid of each thin film transistor (TFT) via column electrode G1A-G4A.View data driving circuit 104 produces the picture signal of corresponding each sweep signal in regular turn, delivers to first pixel cell 111 via the thin film transistor (TFT) (for example thin film transistor (TFT) T1) of row electrode D1A-D4A and corresponding first pixel cell 111; View data driving circuit 106 produces the picture signal of corresponding each sweep signal in regular turn, delivers to second pixel cell 112 via the thin film transistor (TFT) (for example thin film transistor (TFT) T2) of row electrode D1B-D4B and corresponding second pixel cell 112.
Though Known designs utilizes two thin film transistor (TFT) T1, T2 to control the change in voltage of first pixel cell 111 and second pixel cell 112 respectively; Can obtain the good optical response down in the design in single liquid crystal structure gap; Implement different γ calibration curves but above-mentioned design demand is as shown in Figure 2 than the complicated circuitry framework; For example need the row electrode of two different image data driving circuits 104,106 and twice, obviously increase element cost and design complexities.
Summary of the invention
Therefore, the purpose of one embodiment of the invention is providing a kind of LCD and pixel cell thereof, and the zones of different of pixel cell has V-T characteristic curve separately, obtains to simplify driving framework and hang down the effect that manufacturing cost provides the good optical response with one.
Provide a kind of pixel cell to be suitable for being electrically connected to a data line and one first sweep trace and one second sweep trace according to one embodiment of the invention, this pixel cell comprises one first pixel cell and one second pixel cell.First pixel cell is formed with the first film transistor that is electrically connected data line, is electrically connected to transistorized one first liquid crystal capacitance of the first film and one first MM CAP.Second pixel cell is formed with one second liquid crystal capacitance and one second MM CAP that is electrically connected transistorized one second thin film transistor (TFT) of the first film, a coupling capacitance and is electrically connected to second thin film transistor (TFT).And coupling capacitance is electrically connected between the source electrode and drain electrode of second thin film transistor (TFT), and the control end of the transistorized control end of the first film and second thin film transistor (TFT) is electrically connected first sweep trace and second sweep trace respectively; And through the element size of said second thin film transistor (TFT) of adjustment or the value of said coupling capacitance; Make one first pixel electrode of said first sub-pixel unit and the potential difference (PD) between community electrode, different with one second pixel electrode of said second sub-pixel unit with the potential difference (PD) between said common electrode.
According to one embodiment of the invention a kind of LCD is provided, it comprises multi-strip scanning line and data line; And a plurality of above-mentioned pixel cells.
According to one embodiment of the invention, in the above-mentioned pixel cell and LCD, the sweep trace that the transistorized control end of the first film is connected and the sweep trace that control end connected of second thin film transistor (TFT) are for adjacent, preferably are respectively n bar (n >=1; N is a positive integer) sweep trace and n-1 bar sweep trace.
According to one embodiment of the invention, can utilize general thin film transistor (TFT) technology to form, can obtain to make same pixel cell to have the effect of two groups of different V-T characteristic curvees.
Description of drawings
Fig. 1 is the equivalent circuit diagram of a pixel cell of known LCD.
Fig. 2 is the block scheme of the driving framework of display driver Fig. 1 embodiment LCD schematically.
Fig. 3 is for schematically showing the sketch according to the LCD of one embodiment of the invention.
Fig. 4 is the equivalent circuit diagram of the LCD of displayed map 3 embodiment.
Fig. 5 is for showing the equivalent circuit diagram according to the LCD of one embodiment of the invention.
10,30 pixel cells
11,31 first sub-pixel unit
12,32 second sub-pixel unit
22 first pixel electrodes
24 second pixel electrodes
40 bilateral diodes
First end of 411 first diode transistors
Second end of 412 first diode transistors
The 3rd end of 413 first diode transistors
First end of 421 second diode transistors
Second end of 422 second diode transistors
The 3rd end of 423 second diode transistors
Cgs1, Cgs2 stray capacitance
Clc1, Clc2 liquid crystal capacitance
Cs1, Cs2 MM CAP
The Cx coupling capacitance
D, D (m) data line
D1 first diode transistors
D2 second diode transistors
D1A, D2A, D3A, D4A, D1B, D2B, D3B, D4B row electrode
G, G (n) sweep trace
G1A, G2A, G3A, G4A column electrode
T1 the first film transistor
T2 second thin film transistor (TFT)
Vcom common electrode current potential
Embodiment
Fig. 3 is for schematically showing the sketch according to the LCD of one embodiment of the invention, and Fig. 4 is the equivalent circuit diagram of the LCD of displayed map 3 embodiment.
Please be simultaneously with reference to figure 3 and Fig. 4; Comprise a plurality of pixel cell 10, multi-strip scanning line G and data line D, common electrode (not shown) and liquid crystal layer (not shown) according to one embodiment of the invention LCD, each pixel cell 10 comprises a first film transistor T 1, and one second thin film transistor (TFT) T2, one first pixel electrode 22, one second pixel electrode 24.Wherein each pixel cell 10 promptly for example is a redness (R) pixel, green (G) pixel or indigo plant (B) pixel.
Pixel cell 10 (pixel unit) is divided into one first sub-pixel unit (first sub-pixel unit), 11 and 1 second sub-pixel unit 12 (second sub-pixel unit); Be formed with a first film transistor T 1, a MM CAP Cs1 and a liquid crystal capacitance Clc1 on first sub-pixel unit 11; Liquid crystal capacitance Clc1 be by first pixel electrode 22 and common electrode (not shown) at interval liquid crystal layer (not shown) form, and MM CAP Cs1 and liquid crystal capacitance Clc1 all are electrically connected to the first film transistor T 1.Be formed with one second thin film transistor (TFT) T2, a MM CAP Cs2, a liquid crystal capacitance Clc2 and a coupling capacitance Cx on second sub-pixel unit 12; Liquid crystal capacitance Clc2 is formed by second pixel electrode 24 and common electrode (not shown) interval liquid crystal layer (not shown); And MM CAP Cs2 and liquid crystal capacitance Clc2 all are electrically connected to thin film transistor (TFT) T2; And the two ends of coupling capacitance Cx are electrically connected between the source electrode and drain electrode of the second thin film transistor (TFT) T2, and are electrically connected on first pixel electrode 22 and second pixel electrode 24.The grid of the first film transistor T 1 is electrically connected the n bar sweep trace G (n) among these a little sweep trace G; Its source electrode is electrically connected the m bar data line D (m) among the data line D; And drain electrode is electrically connected the source electrode of the second thin film transistor (TFT) T2, and the grid of the second thin film transistor (TFT) T2 is electrically connected to the n-1 bar sweep trace G (n-1) among these a little sweep trace G of adjacent scanning lines G (n).N-1 bar sweep trace G (n-1) is the upper level sweep trace of n bar sweep trace G (n).That is sweep signal is to import n bar sweep trace G (n) again behind the input n-1 bar sweep trace G (n-1) earlier in regular turn.
Therefore; Design according to this enforcement; Through adjusting the value of the second thin film transistor (TFT) T2 element size or coupling capacitance Cx; Can make first pixel electrode 22 and second pixel electrode 24 of same pixel cell different, even also same pixel cell has the effect of two groups of different V-T characteristic curvees with potential difference (PD) between common electrode potential Vcom.This characteristic can solve colour cast (color shift) phenomenon and ghost (image-sticking) phenomenon; And also can be applicable to varying environment and obtain different-effect; For example; Can be applicable to a wide-angle liquid crystal display so that good viewing angle compensation effect to be provided, or can be applicable to a semi-permeable LCD device to improve the optical match of transmission area and echo area.
One embodiment of the invention is to utilize general thin film transistor (TFT) technology to form coupling capacitance Cx; Make two thin film transistor (TFT) T1 and T2 under the situation that is electrically connected same data line signal source; Still it is poor to let first pixel electrode 22 and second pixel electrode, 24 relative common electrode current potential Vcom have two kinds of different potential; Compared to known technology, the embodiment of the invention can reduce the quantity in data line signal source, and simplifies the circuit of dot structure.In addition, also can arrange in pairs or groups intrinsic technology and not need extra manufacturing cost and complicated driving framework can obtain the good optical response.
Because the grid of the second thin film transistor (TFT) T2 is electrically connected the two ends that sweep trace G (n-1) and its source electrode and drain electrode are electrically connected coupling capacitance Cx respectively; Therefore when upper level sweep trace G (n-1) is driven; Can be through the setting of the second thin film transistor (TFT) T2, the voltage difference of neutralize first pixel electrode 22 and second pixel electrode 24.Even, after stopping to drive sweep trace G at the corresponding levels (n), also can provide second pixel electrode 24 1 discharge paths, and can improve the problem of electric charge residual (DC is residual).
In addition, according to above-mentioned design, also has the advantage that second pixel electrode 24 more is not vulnerable to feedthrough phenomenon (feed-through issue) influence.
Fig. 5 is for showing the equivalent circuit diagram according to the LCD of one embodiment of the invention.With pixel cell 10 components identical, use identical symbol in the element of pixel cell 30, and omit its related description, below explanation difference between the two.
Please with reference to Fig. 5; Pixel cell 30 is divided into one first sub-pixel unit 31 and one second sub-pixel unit 32; Be formed with a first film transistor T 1, a MM CAP Cs1 and a liquid crystal capacitance Clc1 on first pixel cell 31; Liquid crystal capacitance Clc1 be by first pixel electrode (not shown) and common electrode (not shown) at interval liquid crystal layer (not shown) form, and MM CAP Cs1 and liquid crystal capacitance Clc1 all are electrically connected to the first film transistor T 1.The grid of the first film transistor T 1 is electrically connected on the one scan line G (n) among the sweep trace G, and its source electrode is electrically connected the data line D (m) among the data line D, and drain electrode is electrically connected liquid crystal capacitance Clc1.Be formed with a MM CAP Cs2, a liquid crystal capacitance Clc2 of mutual electrical connection on second sub-pixel unit 32.Liquid crystal capacitance Clc2 is formed by first pixel electrode (not shown) and common electrode (not shown) interval liquid crystal layer (not shown).And between liquid crystal capacitance Clc1 and liquid crystal capacitance Clc2, be electrically connected with a two-way diode 40, preferably between first pixel electrode and second pixel electrode, be electrically connected with bilateral diode 40.Bilateral diode 40 comprises one first diode transistors D1 and one second diode transistors D2, and first end 411 of the first diode transistors D1 is electrically connected on second end 422 of the second diode transistors D2; Second end 412 of the first diode transistors D1 is electrically connected on first end 421 of the second diode transistors D2; The 3rd end 413 of the first diode transistors D1 is electrically connected on first end 411 of the first diode transistors D1 and the MM CAP Cs2 and the liquid crystal capacitance Clc2 of second sub-pixel unit 32; The 3rd end 423 of the second diode transistors D2 is electrically connected on first end 421 of the second diode transistors D2 and the MM CAP Cs1 and the liquid crystal capacitance Clc1 of first sub-pixel unit 31.Therefore, second end 412 of the first diode transistors D1 and 413 at the 3rd end can form the first stray capacitance Cgs1 in bilateral diode 40; And can form the second stray capacitance Cgs2 in second end 422 and 423 at the 3rd end of the second diode transistors D2.
In the present embodiment; Utilize bilateral diode 40 to connect first pixel electrode 22 and second pixel electrode 24; First pixel electrode 22 and second pixel electrode 24 and the parasitic capacitance Cgs1, the Cgs2 that make bilateral diode 40 are coupled; When the sweep signal of scan line G (n) drove, view data began to first pixel electrode 22 and 24 chargings of second pixel electrode, and poor in forming two different potentials between the two.When stopping sweep signal, bilateral diode 40 voltage difference of first pixel electrode 22 and second pixel electrode 24 that can neutralize, and can provide second pixel electrode 24 1 discharge paths, therefore can improve ghost phenomena.According to the design of present embodiment, also has the advantage that second pixel electrode 24 more is not vulnerable to feedthrough phenomenon (feed-through issue) influence.
In addition, according to the design of present embodiment, still can be through the size of adjustment first and second diode transistors D1 and D2; And the value of stray capacitance Cgs1 and Cgs2, so that the discharge rate of bilateral diode 40 is followed pass electric current (Ioff) unanimity of the first film transistor T 1, and can reduce (flicker) problem of flashing effectively.
The above is merely illustrative, but not is restricted.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the appended claim scope, but not be defined in the above embodiments its equivalent modifications of carrying out or change.
Claims (6)
1. a pixel cell is suitable for being electrically connected to a data line and one first sweep trace and one second sweep trace, it is characterized in that said pixel cell comprises:
One first sub-pixel unit, it is formed with the first film transistor that is electrically connected said data line, is electrically connected to transistorized one first liquid crystal capacitance of said the first film and one first MM CAP; And
One second sub-pixel unit, it is formed with one second liquid crystal capacitance and one second MM CAP that is electrically connected transistorized one second thin film transistor (TFT) of said the first film, a coupling capacitance and is electrically connected to said second thin film transistor (TFT);
Wherein said coupling capacitance is electrically connected between the source electrode and drain electrode of said second thin film transistor (TFT); The control end of transistorized control end of said the first film and said second thin film transistor (TFT) is electrically connected said first sweep trace and said second sweep trace respectively; And through the element size of said second thin film transistor (TFT) of adjustment or the value of said coupling capacitance; Make one first pixel electrode of said first sub-pixel unit and the potential difference (PD) between community electrode, different with one second pixel electrode of said second sub-pixel unit with the potential difference (PD) between said common electrode.
2. pixel cell as claimed in claim 1 is characterized in that, said first sweep trace and said second sweep trace are for adjacent.
3. pixel cell as claimed in claim 1 is characterized in that, the transistorized source electrode of said the first film is electrically connected said data line, and said the first film transistor drain is electrically connected the said source electrode of said second thin film transistor (TFT).
4. pixel cell as claimed in claim 1; It is characterized in that; Said first liquid crystal capacitance is to be formed by said first pixel electrode and said common electrode interval one liquid crystal layer, and said second liquid crystal capacitance is to be formed by said second pixel electrode and said common electrode interval one liquid crystal layer.
5. a LCD is characterized in that, described LCD comprises:
Multi-strip scanning line and many data lines, the zone definitions that said multi-strip scanning line and said many data lines are surrounded goes out a plurality of pixel cells, and each said pixel cell is divided into:
One first sub-pixel unit, it is formed with the first film transistor that is electrically connected said many data line one of which, is electrically connected to transistorized one first liquid crystal capacitance of said the first film and one first MM CAP; And
One second sub-pixel unit, it is formed with one second liquid crystal capacitance and one second MM CAP that is electrically connected transistorized one second thin film transistor (TFT) of said the first film, a coupling capacitance and is electrically connected to said second thin film transistor (TFT);
Wherein said coupling capacitance is electrically connected between the source electrode and drain electrode of said second thin film transistor (TFT); The transistorized control end of said the first film is connected to n bar sweep trace, and the control end of said second thin film transistor (TFT) is connected to n-1 bar sweep trace, and wherein n >=1 and n are positive integer; And through the element size of said second thin film transistor (TFT) of adjustment or the value of said coupling capacitance; Make one first pixel electrode of said first sub-pixel unit and the potential difference (PD) between community electrode, different with one second pixel electrode of said second sub-pixel unit with the potential difference (PD) between said common electrode.
6. LCD as claimed in claim 5 is characterized in that, the transistorized source electrode of said the first film is electrically connected corresponding said data line, and said the first film transistor drain is electrically connected the said source electrode of said second thin film transistor (TFT).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100022226A CN101776825B (en) | 2009-01-08 | 2009-01-08 | Liquid crystal display and pixel unit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100022226A CN101776825B (en) | 2009-01-08 | 2009-01-08 | Liquid crystal display and pixel unit thereof |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110224332 Division CN102289121B (en) | 2009-01-08 | 2009-01-08 | Liquid crystal display and pixel unit thereof |
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| CN101776825A CN101776825A (en) | 2010-07-14 |
| CN101776825B true CN101776825B (en) | 2012-02-01 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI396918B (en) | 2009-09-03 | 2013-05-21 | Chunghwa Picture Tubes Ltd | Pixel array |
| US8810491B2 (en) * | 2011-10-20 | 2014-08-19 | Au Optronics Corporation | Liquid crystal display with color washout improvement and method of driving same |
| TWI483238B (en) * | 2012-12-07 | 2015-05-01 | Au Optronics Corp | Pixel driving circuit and pixel matrix |
| CN105116579B (en) * | 2015-09-30 | 2019-05-03 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and its driving method |
| CN106842743B (en) * | 2017-02-09 | 2019-11-15 | 深圳市华星光电技术有限公司 | A kind of liquid crystal pixel circuit and liquid crystal display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6952244B2 (en) * | 2001-02-27 | 2005-10-04 | Sharp Kabushiki Kaisha | Active matrix device and display |
| CN1822076A (en) * | 2005-02-14 | 2006-08-23 | 株式会社日立显示器 | Display and method of driving same |
| CN101055383A (en) * | 2006-04-12 | 2007-10-17 | 胜华科技股份有限公司 | Active matrix-type liquid crystal display device and its pixel structure |
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- 2009-01-08 CN CN2009100022226A patent/CN101776825B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6952244B2 (en) * | 2001-02-27 | 2005-10-04 | Sharp Kabushiki Kaisha | Active matrix device and display |
| CN1822076A (en) * | 2005-02-14 | 2006-08-23 | 株式会社日立显示器 | Display and method of driving same |
| CN101055383A (en) * | 2006-04-12 | 2007-10-17 | 胜华科技股份有限公司 | Active matrix-type liquid crystal display device and its pixel structure |
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