TW201113854A - Pixel circuit and display panel - Google Patents

Abstract

A pixel circuit includes: a first display unit, a second display unit, a connecting capacitor, and a switching unit. The switching unit performs a switching operation according to whether a first scanning line or a second scanning line is enabled. When the first scanning line is enabled, a common voltage is supplied to the connecting capacitor. When the first scanning line is disabled and the second scanning line is enabled, the data voltage is supplied to the connecting capacitor, so as to push up the voltage difference of the crystals in the first display unit.

Description

201113854 VI. Description of the Invention: [Technical Field] The present invention relates to a pixel circuit and a display panel having the same, and particularly to a pixel circuit for improving liquid crystal color shift problem and having the same The display panel of the pixel circuit. [Prior Art] Liquid crystal display devices have been widely used in daily life, but most of today's liquid crystal display devices generally have a problem of color shift (Washout), and the technology applied to process color shift problems at the present stage can be roughly divided into the following two. The first way is to use the coupling capacitor method, such as: US Patent Nos. 6078367, 5126865 and other patents, all of which are used to improve the color cast.

The problem, but the biggest disadvantage of this method is that the input voltage drops sharply due to the capacitive coupling relationship. For example, the data voltage is 7 volts, but 疋, the liquid crystal is received in the main area and the secondary area of the 4 display. The voltage will drop to 6.94 volts and 4.6 volts respectively. The voltage drop will cause the main area and the secondary area to fail to reach the maximum voltage, which will cause the liquid crystal brightness (Luminance) to drop greatly, so this method can improve the color shift. The problem, but it will limit the efficiency of the liquid crystal display. The first way is to control the voltage of the main area and the secondary area by inputting a reference potential that continuously oscillates at a high and low level. #: US Patent Publication No. 024689, 2006/0262237 and the like, all adopting such a method. The biggest disadvantage of this method is that because of the need to input an external external reference potential 'in & 'in the circuit design often requires a considerable number of amplifiers 201113854 j 'so will cause the drive circuit area cost (Area_y and _ day ' In order not to drive the wire due to the wire delay factor of the input reference potential, it is therefore necessary to combine the wire width of the common electric dust (v_) = the wire resistance value, which also causes an increase in the area cost of the drive circuit. The problem, therefore, the search from * J double to find a way to the next day's color shift problem, and not to cause ^ φ 4 to take the production cost and reduce the liquid, "under", has been the relevant field The problem that the person is anxious to solve. [Summary of the Invention] 1 The object of the present invention is to provide a pixel circuit suitable for public power (4) to be connected to a first; := and: public power supply Out - the field line and the first scan line, which contains the first 'not early π' with _ with the first end of the data _, the second end, one with the public =: end, and one with the first When a scan line and a coupled second first scan line are enabled, so that the control terminal is de-energized when the first scan line is de-energized, = first: and -^ - second The display unit has: a first:: and the second end is non-conducting; the first end of the material voltage, -:::: is lightly connected to the data line to receive the resource, and the first and the public power supply When the coupled third 钿 and the first scan line of the 6 Hz first scan line are enabled, the first end and the second control end are enabled when the first scan line is disabled The first end 4 is conducting 'and the - connecting capacitor' has a non-conducting with the 4; the second end of the shell is coupled to the first end of the 201113854, and a second end; and a a switching unit that receives the common voltage and the data voltage, and is lightly connected to the second end of the connection capacitor, the first scan line, and the second scan line to be based on the first scan line and the second scan line The situation can be switched to provide the common voltage to the second end of the connection capacitor when the first scan line is enabled and when the first scan line is disabled and the second scan line is enabled. The data voltage is supplied to the second end of the connection capacitor.

In addition, another object of the present invention is to provide a display panel adapted to receive a common power supply, comprising: n scan lines 'the first to nth scan lines, respectively, and the scan lines are sequentially m; data lines, which are the first to mth data lines, and each data line is rotated by a data voltage; nxm are matrix-arranged pixel circuits, wherein the pixel circuits in the i-th column are coupled to The first scan line, the 丨+丨 scan line, and the first data line, i=l~n-1, j=l~m, wherein each pixel circuit comprises: a first display unit, having one and The data line is coupled to receive the first end of the data voltage, the second end is a third end that is connected to the common power source, and the control end is connected to the first scan line, and the control end is The first-scanning pure material is made to conduct between the first end and the second end, and to make the first end and the second end non-conducting when the H-th line is de-energized; the first display unit has a Coupling with the data line to receive the resource, a first end of the voltage, a second end, a third end of the public electrical grain, and - and the first sweep a control terminal coupled to the line, and the control terminal turns on the first end and the second end when the first scan line is enabled in the 201113854, and makes the first when the «- knowing line breaks the energy a non-conducting between the end and the second end; a connecting capacitor having a disc - the first end of the female Chu is further connected to the first end of the display unit, and a second end; and switching early接收 receiving the common voltage and the data voltage, and lightly connecting to the second end of the connection capacitor and the i-th and i+1th scan lines to enable the activation based on the first and first +1 scan lines Switching to provide the common voltage to the second end of the connection capacitor when the ith scan line is enabled, and to provide the data voltage to the connection capacitor when the H1 scan line is enabled The second end of the second end to further change the potential of the first end of the first liquid crystal capacitor. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to FIG. 1 ', a preferred embodiment of the pixel circuit of the present invention is adapted to couple a first scan line 0' and a second scan line Gn+1, and receive a common voltage (Common voltage, Vcom), a data voltage Vdata' outputted by a data line, and the first scan line Gn and the second scan line Gn+1 are sequentially enabled (Enable). The pixel circuit of this embodiment includes a first a display unit 1, a second display unit 2, a connection capacitor 3, and a switching unit 4. The first display unit 1 has a first end and a second coupled to the data line to receive the data voltage Vdata. And a control terminal coupled to the first scan line Gn, and the control end enables the first The terminal and the second terminal are turned on, and when the first scan line Gn is disabled, the first terminal and the second terminal are not turned on. The first display unit 2 is similar to the first display unit 1. , having a first end, a second end, and a fourth end coupled to the data line to receive the data voltage Vdata a third end of the common power supply interface, and a control terminal coupled to the first scan line & and the control terminal is enabled to disable the first end and the second end when the first scan line is enabled When the first scan line is deenergized, the first end and the second end are not turned on. The connection capacitor 3 has a first end connected to the first display, and a second The first-(four), the switching unit 4 receives the common voltage core (10), the data voltage

And the first scan line Gn and the second scan line of the connection capacitor 3 are in the case of the first scan line Gn and the second scan line Gn+i. That is, when the first scan and the line are enabled, the second voltage Vc〇m is supplied to the second end of the connection capacitor 3, and the mine field Gn is deenergized and the second broadcast voltage vdμ is caused. Can provide 'this information

Vdata,,. The second end of the capacitor 3 is connected to the side. In detail, the switch is turned on 4 - the transistor 42. The first electric power; the second end includes a -th-th end, a coupling, and a second end of the second end of the first adultery 耦 coupled to the public power source

The first (10) terminal is turned on between the ends of the first scan line W to provide the common voltage Vcom to the second end of the connection capacitor 3 of 201113854. When the first scanning line Gn is deenergized, the first end and the second end are not turned on, and the supply of the common voltage is stopped.

Vcom gives the second end of the connection capacitor 3. The second transistor 42 has a first end for receiving the data voltage, a control terminal for lightly connecting the connection capacitor 3, the second end of the second end, and the second pure scan line, and the control terminal is at the second end. When the scan line G is enabled, 'the first end and the second end are turned on to provide the data voltage u to connect the second end of the capacitor 3. When the second scan line g is de-energized, the first end and the second end are not turned on, and the supply of the data voltage Vdata to the second end of the connection capacitor 3 is stopped. The mode A of the pixel circuit of this embodiment is in two stages of T: a charging phase and a voltage boosting phase. The charging phase 2 scan line Gn+1 is enabled by the de-energized end and the second end by the second end of the second end, respectively, and the first scan line Gn is enabled and the first time, the first one, the second display unit 1, The first conduction of 2 is, therefore, the first and second display units 1, the transistor 41 are turned on and

For the data voltage Vdata, at the same time, the first two transistors 42 are not turned on, therefore, the connection capacitor 3 has a common voltage, and therefore, the two ends of the connection capacitor 3 are electrically suspended and the second display unit is second. The voltage difference between the terminal and the third terminal is V - voltage boosting phase 201113854

After the charging phase, the first scan line Gn is deenergized and the second field 'line Gn+1 is enabled. At this time, the first electric crystal (four) will not be turned on: the second transistor 42 will Being turned on, so the second end of the connection capacitor 3 receives: the data voltage v_ outputted by the second end of the hexa- 显2, and because the connection capacitor 3 & has a discharge path for discharging, therefore, The connection voltage: the voltage at the first end of 3 will be increased to 2ν£ΐ·ν_. Because the first end of the connection grid 3 is coupled to the second end of the first display unit, the voltage difference between the first end and the third end of the indicator unit 1 is raised to 2Vdata-2Vc. m. For example, if the common voltage is 〇v and the data voltage is 7 v, the voltage of the second terminal of the first display unit 提升 can be increased from 7 V to 14 V during the voltage boosting phase, and the second display unit S 2 The voltage at the first end can be 7 v, so the liquid crystal molecules of the two liquid crystal capacitors are subjected to different operating voltages and different degrees of twisting, so that multi-domain (muhid〇ma (8) display effect can be achieved to expand the viewing angle of the display panel. Compared with the prior art, the two operating voltages of the present invention not only increase the voltage value, but also have a large gap, so that the multi-domain display can be better, and the color shift problem can be effectively improved. The external input of a reference voltage is more convenient and effective in use. It should be noted that in this embodiment, the first and second transistors i and 2 are each a thin film transistor (TFT), but not Referring to FIG. 2, a preferred embodiment of the display panel of the present invention is adapted to receive a common voltage Vcom provided by a common power source, and includes n scanning lines G(1) to G(n) and m strips arranged at intervals. Interval Lines D(l) to D(m), and 201113854 nxm pixel circuits as described above, and the nxm pixel circuits are respectively located between any two scan lines and any two data lines, and in the third column The pixel circuits are all coupled to the ith scan line and the i+1th scan line, and the pixel circuits in the jth line are all coupled to the jth data line. The m data lines respectively output m data voltages And the scanning finger lines are sequentially enabled, and when the scanning line coupled to each pixel circuit is enabled, the aforementioned charging phase or voltage boosting phase is performed.

3, the present invention and related prior art Gamma Curve 'view 3 can be found that the effect of the present invention for color shift processing is comparable to the related prior art, however, the pixel circuit according to the present invention is directed to each After the pixel processing, the voltage received by the corresponding liquid crystal of each pixel can be increased. Therefore, the known improved color shifting technique can often have a better effect in the case of a large voltage range. In summary, in the first display unit pressure difference compared with the prior art, the power of the second end and the third end of the voltage value 1 received by the liquid crystal in the unit 1 can effectively raise the first display. To improve the display efficiency of the two LCDs

rate. Further, the method provided by the present invention does not require an additional input reference potential as compared with the method of the prior art, and since A does not cause an increase in area cost, the object of the present invention can be achieved. The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent change of the patent scope and the description of the invention in the present invention is Modifications are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a pixel circuit of the present invention; FIG. 2 is a schematic view of a panel of the present invention, and FIG. 3 is a gamma diagram of the prior art of the present invention.

11 201113854 [Description of main component symbols] 1 ..... The first display unit 4... -----Switching unit 2 ..... •...·Second display unit 41 ...·. Crystal 3 .... ••...connecting capacitor 42.·····second transistor

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Claims (1)

201113854 VII. Patent application scope: A pixel circuit, suitable for the _ ^ is used to receive a data line output of a data voltage and a common power output of a common Thunder common voltage and coupled to a first scan And a second scan line, comprising: an A display unit having a first end coupled to the data line for receiving the data voltage, a flute, and a third end coupled to the common power source 'and-the control terminal that is connected to the first scan line, and the control When the first scan line is enabled, the first end and the second end are turned on' and when the first scan line is deactivated, the first end and the second end are not turned on; The unit has a first end coupled to the data line to receive the data voltage, a third end, and a control end coupled to the first second end and a scan line coupled to the common power source And the control terminal turns on the first __ end and the second end when the first scan line is enabled, and makes the first end and the second end when the first scan line is disabled a non-conducting; - a connecting capacitor having a first end connected to the first display unit, and a second end; and an end-switching unit receiving the common electric power, the electric energy, and the The first end of the connection, the first scan line and the second scan line are coupled to switch based on an enabling condition of the first scan line and the second scan line, so that the first scan line is enabled Providing the common voltage to the second end of the connection capacitor, and the first scan line is de-energized and the second scan line is caused Providing the data voltage to the second end of the connection capacitor. 13 201113854 2. According to the pixel circuit of the slogan of the patent application scope, wherein the switching unit comprises: the first transistor 'has one The first end of the 玄 公共 public power supply, the first 鸲 of the 坌-mouth coupled to the second end of the connection capacitor, and the control end of the first scan line, and When the first scan line is enabled, the control terminal turns on the first end and the second end to enable the second end to receive the common voltage, and when the first scan line is disabled, < a second transistor is electrically non-conducting; a second transistor having a first end that is in contact with the second end of the second display unit, and a second end that consumes the second end of the connection capacitor And a control end coupled to the second scan line, and the control end is electrically connected between the first end and the second end to enable the second end to receive the data voltage when the second scan line is enabled. And when the second scan line is deenergized, the first end and the second end are not turned on. The pixel circuit of claim 2, wherein the first and first transistors are respectively a thin film transistor. A display panel is adapted to receive a common power supply, and the method comprises: calling n scan lines 'The first to nth scan lines, respectively, and the scan lines are sequentially enabled; m data lines are the first to mth data lines, and each data line is rotated by a data voltage; nxm Arranging a pixel circuit in a matrix, wherein the pixel circuit in the i-th column is coupled to the ith scan line, the i+1th scan line, and the j-th data line 'i=l~n-1, j=1~m Each of the pixel circuits includes: 14 201113854 - a first display unit having a first end coupled to the data line for receiving the data voltage, a second end, and a third coupled to the common power source And a control coupled to the first scan line and the control terminal turns on the first and the _ends when the first scan line is enabled When the trace line is de-energized, the first end and the second end of the δ-Xuan are not turned on, and the second display unit has a The line is coupled to receive the first end of the data voltage, a second end, a third end coupled to the common power source, and a control end coupled to the first scan line and the control end is When the first scan line is enabled, the first end and the second end are turned on, and when the first scan line is deenergized, 'the first end and the second end are not turned on; a connection capacitor, Having a first end that is in contact with the second end of the first display unit, and a second end; and a switching unit that receives the common voltage and the data voltage, and is coupled to the second end of the connection capacitor And the i-th and x-th scan lines are switched according to an enabling condition of the i-th and i-th scan lines, so that when the i-th scan line is enabled, the common voltage is supplied to the connection The second end of the tantalum capacitor, and when the i+1th scan line is enabled, provides the data voltage to the second end of the connection capacitor to further change the potential of the first end of the first liquid crystal capacitor. The display panel of claim 4, wherein the switching unit comprises: a first transistor having a first end coupled to the common power source, 15 201113854 a second end of the two ends and - (4) a control end of the first scan line, and the control end is turned on between the first end and the second end when the first scan line is enabled to enable the second end to receive the Public electric dust: When the first scanning line is de-energized, the first end and the second end are not turned on; the first transistor has a | 兮 θ ϊ 00. ^ Xing 5 hai second display unit The second end of the second end consumes a second end of the second end of the connection capacitor and a control u that consumes the second scan line, and the control terminal In the second sweep When the line is enabled, the first 丨 , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , When the first turn and the second end are not turned on. 6. According to the scope of claim patent item No., the display panel of the backrest, wherein the first and the first electric body are respectively - thin film transistors. 16