[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

KR20080062542A - Ips mode transflective liquid crystal display device - Google Patents

Ips mode transflective liquid crystal display device Download PDF

Info

Publication number
KR20080062542A
KR20080062542A KR1020060138481A KR20060138481A KR20080062542A KR 20080062542 A KR20080062542 A KR 20080062542A KR 1020060138481 A KR1020060138481 A KR 1020060138481A KR 20060138481 A KR20060138481 A KR 20060138481A KR 20080062542 A KR20080062542 A KR 20080062542A
Authority
KR
South Korea
Prior art keywords
liquid crystal
voltage
crystal display
storage capacitor
display device
Prior art date
Application number
KR1020060138481A
Other languages
Korean (ko)
Inventor
김홍수
황한욱
Original Assignee
엘지디스플레이 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지디스플레이 주식회사 filed Critical 엘지디스플레이 주식회사
Priority to KR1020060138481A priority Critical patent/KR20080062542A/en
Publication of KR20080062542A publication Critical patent/KR20080062542A/en

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133524—Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • G02F1/133555—Transflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13458—Terminal pads

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Geometry (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

An in-plane switching mode transflective LCD(Liquid Crystal Display) is provided to vary the voltage of a pixel electrode to an effective voltage using a storage capacitor voltage to reduce power consumption. An in-plane switching mode transflective LCD includes a plurality of pixel regions(P1) defined by gate lines(GL1,GL2,GLn) and data lines(DL1,DL2,DLm), a common voltage line(Vcom), first and second storage capacitor voltage lines(SL1,SL2) which are arranged in parallel with the data lines, and first and second TFTs(Thin Film Transistors)(T1,T2) connected to a corresponding gate line and a corresponding data line. The LCD further includes liquid crystal capacitors(LC) respectively having first electrodes respectively connected to the first and second TFTs and second electrodes connected to the common voltage line, and first and second storage capacitors(Cst1,Cst2) respectively having first electrodes respectively connected to the first and second TFTs and second electrodes respectively connected to the first and second storage capacitor voltage lines.

Description

Transverse electric field transflective liquid crystal display device {IPS mode Transflective liquid crystal display device}

1 is an equivalent circuit diagram of a pixel structure for explaining driving of a transverse electric field mode liquid crystal display device.

2 is a diagram schematically illustrating transmittance of each layer of light emitted from a backlight lamp.

3 is a schematic cross-sectional view of a transflective liquid crystal display device to which a general dual cell gap structure is applied.

4 is an equivalent circuit diagram illustrating a pixel structure in a transverse electric field transflective liquid crystal display device according to a first embodiment of the present invention.

FIG. 5 is an equivalent circuit diagram illustrating a pixel structure in a transverse electric field transflective liquid crystal display device according to a second exemplary embodiment of the present invention.

6 is a waveform diagram of signals applied to first and second subpixels of a transverse electric field transflective liquid crystal display according to a second exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

LC: Liquid Crystal Layer Cst: Storage Capacitor

GL1 to GLn: gate line DL1 to DLm: data line

Vcom: Common voltage P1: Pixel area

Vst: Auxiliary capacitance voltage SL: Auxiliary capacitance voltage line

The present invention relates to a transflective liquid crystal display device, and more particularly, to a transflective liquid crystal display device in which transflective liquid crystals have the same maximum transmissivity of the liquid crystal part and the transmissive part caused by the difference in cell gap in the transflective liquid crystal display device. It relates to a display device.

In general, a twisted nematic (TN) mode liquid crystal display device has a structure in which a common electrode and a pixel electrode are separated, and an in-plane switching mode liquid crystal display device has a structure of a TN mode liquid crystal display device. It is a liquid crystal display device having a wide viewing angle developed to solve the problem of narrow viewing angle, which is a big disadvantage. In the IPS mode liquid crystal display device, the common electrode and the pixel electrode are formed together on the same substrate, and the liquid crystals are driven by a horizontal electric field generated between the electrodes, thereby having a larger viewing angle than that of the TN mode liquid crystal display device. .

FIG. 1 is an equivalent circuit diagram of a pixel structure for explaining driving of a transverse electric field mode liquid crystal display device, wherein analog data is transmitted through data lines DL1 to DLm while a plurality of gate lines GL1 to GLn are sequentially turned on. A voltage is applied to the liquid crystal LC of each pixel, and the amount of light transmission is controlled by the transverse electric field of the liquid crystal generated by the voltage difference between the common electrode and the pixel electrode to which the DC voltage is applied.

Subsequently, the storage capacitor C ST is charged, and when the gate lines GL1 to GLn are turned off, the pixel voltage applied to the liquid crystal LC is maintained through the discharge of the storage capacitor C ST . However, in the liquid crystal display device using the transverse electric field as described above, since the distance between the pixel electrode and the common electrode formed on the same substrate is larger than that in the structure in which the pixel electrode and the common electrode are formed on different substrates, the data signal is larger. There is a problem that the voltage is required, which increases the power consumption.

On the other hand, the liquid crystal display device described above should be provided with a separate light source because the liquid crystal material is generally composed of a light-receiving element that does not have its own light emitting element, for this purpose is provided with a backlight lamp (Backlight lamp) on the back of the liquid crystal panel The method of supplying light to the liquid crystal panel has been widely used.

However, such a liquid crystal display is a very inefficient light modulator that transmits only 3 to 8% of the light incident by the backlight.

The light transmittance of the liquid crystal panel is about 7.4 assuming that the two polarizations have a transmittance of 45%, an upper and lower glass substrates of 94%, a TFT array and a pixel of about 65%, and a color filter of 27%. %to be.

2 is a diagram schematically illustrating the transmittance of each layer of light emitted from the backlight lamp. When the brightness of the light emitted from the backlight lamp is 100%, the amount of light emitted after finally passing through the liquid crystal panel is As shown in the figure, the brightness of the backlight should be bright, and the power consumption by the backlight is large in a high brightness liquid crystal display device.

In order to solve the above-mentioned problem, a liquid crystal display device having a reflective liquid crystal panel which does not use backlight light has recently been proposed. Since it operates by using natural light, the power consumption of the backlight can be greatly reduced, so that it can be used in a portable state for a long time, and the aperture ratio is also superior to that of a conventional backlight liquid crystal display device.

That is, the reflective liquid crystal display device reflects external light by using a material having an opaque reflective characteristic in the pixel portion formed of the transparent electrode in the conventional liquid crystal display device.

The reflection type liquid crystal display device described above can be used for a long time because it is driven using natural light or an external artificial light source without using an internal light source such as a backlight. In other words, the reflective liquid crystal display device is configured to reflect external natural light to the reflective electrode and use the reflected light. Therefore, only power required for driving the reflective liquid crystal display device is the liquid crystal driving and driving circuit.

However, natural or artificial light sources do not always exist. That is, the reflective liquid crystal display may be used in the daytime where natural light is present or in an office or building where external artificial light exists, but the reflective liquid crystal display may be used in a dark environment in which natural light does not exist. There will be no.

Accordingly, in order to solve the above problem, a transflective liquid crystal display device using the advantages of the reflective liquid crystal display device using natural light and the transmissive liquid crystal display device using backlight light has been recently researched and developed.

The transflective liquid crystal display includes a reflection unit using an effect re-reflected by external light and a transmission unit using a passage of backlight light to implement a screen, and the reflecting unit and the transmission unit have the same cell gap ( In the case of forming a cell gap structure, the voltage-transmittance characteristics of the reflecting portion and the transmitting portion are different for the same driving voltage, and thus, it is difficult to achieve high brightness and high contrast.

In order to solve this problem, a semi-transmissive liquid crystal display device having a dual cell gap structure has recently been proposed, in which the cell gap of the transmission part is designed to be twice the cell gap of the reflection part.

3 is a schematic cross-sectional view of a transflective liquid crystal display device to which a general dual cell gap structure is applied. As shown in FIG. 3, the first and second substrates 60 and 80 are disposed to be spaced apart from each other by a predetermined distance. A transparent electrode 62 is formed on one substrate 60. In addition, an insulating layer 66 having a first opening 64 partially exposing the upper portion of the transparent electrode 62 is formed. In addition, a reflective layer 70 having a second opening 68 corresponding to the first opening 64 is formed on the insulating layer 66.

Here, the reflective layer 70 may be a reflective electrode that serves as an electrode, or may correspond to any one of a reflective plate of an island pattern structure.

A color filter layer 82 and a common electrode 84 are sequentially stacked below the second substrate 80, and a liquid crystal layer 90 is interposed between the first and second substrates 60 and 80 to form a liquid crystal. The thickness of layer 90 is defined as cell gaps D1 and D2.

Here, the substrate region corresponding to the reflective layer 70 forms a reflector, and the transparent electrode 62 region exposed in the section between the first and second openings 64 and 68 forms a transmissive portion, In order to reduce the difference in the phase difference value of the light due to the difference between the travel distance L1 and the travel distance L2 of the light in the transmission part, the travel distance L1 of the light in the reflection part is the travel distance of the light in the transmission part ( In view of being twice as large as L2, the reflector cell gap D1 including the insulating layer 66 has a first opening of the insulating layer 66 by the thickness value of the insulating layer 66. It is made to correspond to 1/2 of the permeation | transmission part cell gap D2 which has 64. Thereby, the color characteristic of a reflecting part and a transmission part can be kept uniform.

However, in the dual cell gap structure transflective mode, when the reflector cell gap D1 is formed to be 1/2 of the transmissive cell gap D2, as described above, the color characteristics of the reflector and the transmissive part are kept uniform. However, the phenomenon that the maximum transmittance of the liquid crystal layer 90 is changed occurs. That is, the light reflected through the reflecting part has a problem that the gray level is smaller than the transmission part by a predetermined level, so that the desired image cannot be displayed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and in a transverse electric field liquid crystal display device, a subsidiary electric field liquid crystal display which uses a subcapacity to drive at a voltage lower than the actual data voltage to reduce power consumption. It is a first object to provide a device, and the dual cell semi-transmissive method is applied to the transverse electric field liquid crystal display, thereby transversal electric field half that overcomes the gray level difference caused by the change in the liquid crystal maximum transmittance of the reflecting unit and the transmitting unit. It is a second object to provide a transmissive liquid crystal display device.

In order to achieve the above object, the transverse electric field transflective liquid crystal display according to the embodiment of the present invention comprises: a plurality of pixel regions in which a plurality of gate lines and data lines are defined to cross each other; A common voltage line formed in parallel with the data line, and first and second storage capacitor voltage lines; First and second thin film transistors connected to the gate line and the data line; A liquid crystal capacitor connected to the thin film transistor and one electrode, and the other electrode connected to the common voltage line; The first and second thin film transistors are connected to one electrode, and the other electrode includes first and second storage capacitors respectively connected to the first and second storage capacitor voltage lines.

The pixel area may include a first subpixel area, which is an area corresponding to an electrode connected to the first thin film transistor; And a second subpixel area corresponding to an electrode connected to the second thin film transistor.

The first subpixel area is a transmissive part, the second subpixel area is a reflecting part, and the reflecting part further comprises a reflector of an island pattern.

In order to achieve the above object, a method of driving a transverse electric field transflective liquid crystal display device according to an embodiment of the present invention, comprising: sequentially applying a gate high signal to the gate line; Applying a data signal to each data line according to the gate high signal; And applying a first storage capacitor voltage to the other electrode of the first and second storage capacitors when a gate low signal is applied to the gate line.

The second storage capacitor voltage is a level higher than the first storage capacitor voltage.

Hereinafter, a transverse electric field transflective liquid crystal display device according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

4 is an equivalent circuit diagram illustrating a pixel structure in a transverse electric field transflective liquid crystal display device according to a first embodiment of the present invention.

A plurality of gate lines GL1 through GLn and a plurality of data lines DL1 through DLm cross each other to form a plurality of pixel regions Pixel, and the common voltage line Vcom configured in parallel with the data lines DL1 through DLm. ), A thin film transistor TFT formed in each of the pixel regions P, and connected to one gate line GLn and data line DLm, and a gate electrode and a source electrode, respectively, and a thin film transistor TFT of the thin film transistor TFT. The liquid crystal capacitor LC is connected to the drain electrode and one electrode and the other one is connected to the common voltage line Vcom, and the storage capacitor C ST is connected to the drain electrode of the thin film transistor TFT. The structure in which the plurality of storage capacitors C ST configured in the pixel areas of the gate lines GL1 to GLn are connected to all the other electrodes is illustrated.

In the pixel area P, one region having a predetermined width is provided with a reflector having an island pattern structure, which is defined as a reflecting unit, and other regions are defined as transmissive units.

The storage capacitor voltage line SL is further configured to apply the storage capacitor voltage V ST to one electrode of the storage capacitor C ST of each of the gate lines GL1 to GLn.

The storage capacitor voltage V ST is supplied through a separately configured storage capacitor voltage source (not shown), wherein each storage capacitor voltage ST is supplied with the storage capacitor C ST having a half frame period. It can be seen as an AC voltage, and the applied capacitance voltage is continuously applied for one frame time.

Hereinafter, the driving of the transverse electric field transflective liquid crystal display device according to the first embodiment of the present invention will be described with reference to the accompanying drawings.

First, when a gate high signal is sequentially applied to each of the gate lines GL1 to GLn, the thin film transistor TFT connected thereto is turned on to transmit a data signal to each of the data lines DL1 to DLm. In this case, the applied data signal applies a data voltage lower than the actual data voltage to charge the pixel electrode.

Subsequently, when a gate low signal is applied to each of the gate lines GL1 to GLn, the storage capacitor voltage Vst is applied to one electrode of each connected storage capacitor C ST through the storage capacitor voltage line SL. The pixel electrode voltage is increased or decreased, wherein the liquid crystal voltage which is changed in contrast to the common voltage line Vcom to which the DC voltage is applied is changed to and maintained as the liquid crystal effective voltage Vrms for actual display. . That is, since the data signal applied through the data line is lower than the liquid crystal effective voltage for the actual display, power consumption is reduced.

For example, in the case of representing a black image (when the liquid crystal effective voltage is 4.5V), a voltage level applied to the common electrode through the common voltage line Vcom is a DC voltage of 3V and the gate line. After charging 5V to the pixel electrode during the gate high signal period through the data line and the data line, and applying the storage capacitor voltage (V ST ) immediately after the gate low signal, the data voltage difference compared to the common voltage 3V Through 2V and the storage capacitor voltage 2.5V, the liquid crystal effective voltage becomes 4.5V, thereby representing a black image.

Therefore, the transverse electric field liquid crystal display device according to the first embodiment of the present invention can be driven at a voltage lower than the actual data voltage, thereby reducing power consumption.

Hereinafter, a second embodiment in which dual cell gap transflectivity is applied to the transverse electric field liquid crystal display according to the first embodiment will be described.

FIG. 5 is an equivalent circuit diagram illustrating a pixel structure in a transverse electric field transflective liquid crystal display device according to a second exemplary embodiment of the present invention.

A plurality of gate lines GL1 to GLn and a plurality of data lines DL1 to DLm cross each other to form a plurality of pixel regions P1, and the pixel regions P are again divided into first and second subpixel regions. (SP1, SP2).

The first and second sub-pixel areas SP1 and SP2 correspond to the transmissive part and the reflecting part, respectively. In one pixel area P1, two thin film transistors TFT, a pixel electrode, and one electrode are provided. Each of the electrodes is connected to each other, and the other electrode is connected to the first and second storage capacitor voltage lines SL1 and SL2 described below.

That is, in the first subpixel area SP1, the electrode may be made of a transparent conductive material, which is defined as a transmission portion.

In addition, the second sub-pixel area SP2 is provided with a reflector of an island pattern structure, which is defined as a reflector.

In more detail, the common voltage line Vcom configured in parallel with the data lines DL1 through DLm, the gate region GLn, the data line DLm, and the gate of each pixel region P1 are respectively formed. First and second thin film transistors T1 and T2 to which an electrode and a source electrode are connected, a drain electrode and one electrode of the thin film transistors T1 and T2 are connected, and the other one is connected to the common voltage line Vcom. The first and second storage capacitors C ST 1 and C ST 2 connected to the liquid crystal capacitor LC and the drain electrodes of the thin film transistors T1 and T2, respectively, and have the same gate lines GL1 to GLn. The first and second storage capacitors C ST 1 and C ST 2 of the pixel regions P1 are connected to all other electrodes.

Here, a first storage capacitor for applying the storage capacitor voltage V ST 1 to one electrode of the storage capacitor C ST 1 of the first subpixel SP1 in each of the gate line GL1 to GLn unit pixel areas. The voltage line SL1 is configured.

In addition, a second storage capacitor voltage line SL2 for applying the storage capacitor voltage V ST 2 to one electrode of the storage capacitor C ST 2 of the second subpixel SP2 is further configured.

In this case, each of the storage capacitor voltages V ST 1 and V ST 2 supplied to the storage capacitors C ST 1 and C ST 2 may be regarded as an AC voltage having a half period of one frame time. The storage capacitor voltage is continuously applied for one frame time.

Here, the first and second storage capacitor voltages V ST 1 and V ST 2 are supplied through a separately configured storage capacitor voltage source (not shown), and the second storage capacitor voltage V ST 2 is supplied to the first storage capacitor voltage. It is the biggest feature of the liquid crystal display device of the second embodiment of the present invention that the voltage level is higher than the voltage V ST 1 by the predetermined voltage Vd.

Hereinafter, the driving of the transverse electric field transflective liquid crystal display device according to the second embodiment of the present invention will be described with reference to the accompanying drawings.

First, when a gate high signal is sequentially applied to each of the gate lines GL1 to GLn, the thin film transistor TFT connected thereto is turned on to transmit a data signal to each of the data lines DL1 to DLm. In this case, the applied data signal applies a data voltage lower than the actual data voltage to charge the pixel electrode.

Subsequently, when a gate low signal is applied to each of the gate lines GL1 to GLn, the first and second storage capacitor voltages are connected to one electrodes of the first and second storage capacitors C ST 1 and C ST 2, respectively. Vst1 and Vst2 are applied to increase or decrease the pixel electrode voltage, wherein the liquid crystal voltage that is changed in contrast to the common voltage line Vcom to which a DC voltage is applied is actually displayed. Is maintained as.

In this case, the second storage capacitor voltage Vst2 applied to the second storage capacitor C ST 2 corresponding to the second subpixel SP2 that is the reflector is the first subpixel SP1 that corresponds to the transmissive unit. Since the level is higher than the first storage capacitor voltage Vst1 applied to the storage capacitor C ST 1 by a predetermined voltage Vd, the liquid crystal effective voltage Vrms of the reflector is higher by Vd than the liquid crystal effective voltage of the transmissive part. (Vrms + Vd).

6 is a waveform diagram of signals applied to first and second subpixels of a transverse electric field transflective liquid crystal display according to a second exemplary embodiment of the present invention.

In the following description, for convenience, the change in the liquid crystal effective voltage Vrms according to the storage capacitance voltage Vst value in the transverse electric field liquid crystal display device according to the first embodiment is not considered. 2 The liquid crystal effective voltage Vrms may be adjusted according to the change of the storage capacitor voltages Vst1 and Vst2.

First, referring to the signal waveform diagram of the transmission part a, when a high signal is applied to one gate line for one frame period during one frame for one frame period, as shown in FIG. Data) is applied to ascend to the VD level VD. Thereafter, when the low signal is applied to the gate line, the data signal Data is converted into the liquid crystal effective voltage Vrms by the first storage capacitor voltage Vst1 to the first storage capacitor C ST 1 of FIG. 5. Is maintained (Vrms = VD).

At the same time, as shown in the figure, when the high signal is applied to the gate line for one horizontal period (1H), the data signal Data is applied to the data line, and then raised to the VD level VD. Subsequently, the second storage capacitor voltage Vst2, which is higher than the first storage capacitor voltage Vst1 by a predetermined voltage Vd, is applied to the data signal so as to secure the maximum transmittance of the liquid crystal to the liquid crystal effective voltage Vrms. The voltage becomes VD + Vd (Vrms = VD + Vd).

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art various modifications and variations of the present invention without departing from the spirit and scope of the present invention described in the claims below I can understand that you can.

Therefore, the transverse field type liquid crystal display device according to the first embodiment of the present invention changes the voltage of the pixel electrode to the effective voltage by using a storage capacitor voltage that varies from line to line, thereby reducing power consumption compared to the conventional driving method. Can be reduced.

In addition, in the transverse electric field transflective liquid crystal display according to the second embodiment of the present invention, one pixel is composed of two or more subpixels having different storage capacitance voltages, and each of the two or more subpixels includes a reflection unit and a transmission unit. After applying to, the auxiliary capacitance voltage of the reflecting unit can be increased to a predetermined level, so that the maximum transmittance of the liquid crystal can be ensured for both the reflecting unit and the transmitting unit.

Claims (5)

A plurality of pixel regions in which a plurality of gate lines and data lines cross each other; A common voltage line formed in parallel with the data line, and first and second storage capacitor voltage lines; First and second thin film transistors connected to the gate line and the data line; A liquid crystal capacitor connected to the thin film transistor and one electrode, and the other electrode connected to the common voltage line; First and second storage capacitors each connected to the first and second thin film transistors and one electrode, and the other electrode connected to the first and second storage capacitor voltage lines, respectively; Transverse electric field transflective liquid crystal display comprising a. The method of claim 1, The pixel area may include a first subpixel area, which is an area corresponding to an electrode connected to the first thin film transistor; A second subpixel area corresponding to an electrode connected to the second thin film transistor; Transverse electric field transflective liquid crystal display comprising a. The method of claim 2, And wherein the first subpixel region is a transmissive portion, the second subpixel region is a reflecting portion, and the reflecting portion further includes an island pattern reflecting plate. A driving method of a transverse electric field transflective liquid crystal display device according to claim 1, Sequentially applying a gate high signal to the gate line; Applying a data signal to each data line according to the gate high signal; When a gate low signal is applied to the gate line, applying first and second storage capacitor voltages to other electrodes of the first and second storage capacitors; A driving method of a transverse electric field transflective liquid crystal display device comprising a. The method of claim 4, wherein And wherein the second storage capacitor voltage is at a level higher than the first storage capacitor voltage by a predetermined voltage.
KR1020060138481A 2006-12-29 2006-12-29 Ips mode transflective liquid crystal display device KR20080062542A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020060138481A KR20080062542A (en) 2006-12-29 2006-12-29 Ips mode transflective liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020060138481A KR20080062542A (en) 2006-12-29 2006-12-29 Ips mode transflective liquid crystal display device

Publications (1)

Publication Number Publication Date
KR20080062542A true KR20080062542A (en) 2008-07-03

Family

ID=39814665

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020060138481A KR20080062542A (en) 2006-12-29 2006-12-29 Ips mode transflective liquid crystal display device

Country Status (1)

Country Link
KR (1) KR20080062542A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8742420B2 (en) 2011-09-01 2014-06-03 Samsung Display Co., Ltd. Gate driving circuit, display substrate having the same and method of manufacturing the display substrate
US9052553B2 (en) 2012-06-22 2015-06-09 Samsung Display Co., Ltd. Liquid crystal display
US9318066B2 (en) 2012-01-18 2016-04-19 Samsung Display Co., Ltd. Display panel having a boosting voltage applied to a subpixel electrode, and method of driving the same
US9646553B2 (en) 2013-12-26 2017-05-09 Samsung Display Co., Ltd. Display device
US11086177B2 (en) 2015-01-26 2021-08-10 Samsung Display Co., Ltd. Display apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8742420B2 (en) 2011-09-01 2014-06-03 Samsung Display Co., Ltd. Gate driving circuit, display substrate having the same and method of manufacturing the display substrate
US9318066B2 (en) 2012-01-18 2016-04-19 Samsung Display Co., Ltd. Display panel having a boosting voltage applied to a subpixel electrode, and method of driving the same
US9570023B2 (en) 2012-01-18 2017-02-14 Samsung Display Co., Ltd. Display panel having a boosting voltage applied to a subpixel electrode, and method of driving the same
US9052553B2 (en) 2012-06-22 2015-06-09 Samsung Display Co., Ltd. Liquid crystal display
US9646553B2 (en) 2013-12-26 2017-05-09 Samsung Display Co., Ltd. Display device
US11086177B2 (en) 2015-01-26 2021-08-10 Samsung Display Co., Ltd. Display apparatus

Similar Documents

Publication Publication Date Title
US8139193B2 (en) Fringe field switching mode liquid crystal display and manufacturing method thereof
US9633619B2 (en) Capacitive voltage dividing low color shift pixel circuit
CN100523927C (en) Transflective liquid crystal display device
US8040447B2 (en) Method of driving display device comprising electrically connecting a control capacitor to the second pixel electrode and changing the voltage of the first pixel electrode by changing a voltage of a first storage line
JP2005122103A (en) Liquid crystal display device with dual light unit
US7961279B2 (en) Transreflective liquid crystal display apparatus with single cell-gap and reduced power consumption
US10429707B2 (en) Pixel structure and display panel
US20180299734A1 (en) Eight-domain pixel structure
KR101071261B1 (en) Liquid crystal display
KR20080062542A (en) Ips mode transflective liquid crystal display device
JP2005182011A (en) Liquid crystal display device and optical film assembly for use in same
KR20100031001A (en) Display device
JP2007334177A (en) Liquid crystal device and electronic apparatus
KR101244691B1 (en) In-plane switching mode liquid crystal display device
US20080204615A1 (en) Liquid crystal display and method thereof
JP2003222890A (en) Liquid crystal display device
US7982833B2 (en) Transflective liquid crystal display panel having a plurality of apertures with a specific ratio of aperture width to aperture interval
JP2002014321A (en) Display device and electronic equipment provided the same
US7633572B2 (en) Liquid crystal display and method of driving the same
CN101576685B (en) Liquid crystal display panel and liquid crystal display device comprising same
EP2249196A1 (en) Transflective liquid crystal display device
US20060132683A1 (en) Array substrate with reduced flicker, display panel having the same, and display device having the same
KR20050042592A (en) Transflective type liquid crystal display device
US10317741B2 (en) Transflective type liquid crystal display device
US8154492B2 (en) Liquid crystal display panel

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination