WO2005057276A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2005057276A1 WO2005057276A1 PCT/JP2004/018269 JP2004018269W WO2005057276A1 WO 2005057276 A1 WO2005057276 A1 WO 2005057276A1 JP 2004018269 W JP2004018269 W JP 2004018269W WO 2005057276 A1 WO2005057276 A1 WO 2005057276A1
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- 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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
- G09G3/3651—Control of matrices with row and column drivers using an active matrix using multistable liquid crystals, e.g. ferroelectric liquid crystals
-
- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1393—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
- G02F1/1395—Optically compensated birefringence [OCB]- cells or PI- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/04—Structural and physical details of display devices
- G09G2300/0469—Details of the physics of pixel operation
- G09G2300/0478—Details of the physics of pixel operation related to liquid crystal pixels
- G09G2300/0491—Use of a bi-refringent liquid crystal, optically controlled bi-refringence [OCB] with bend and splay states, or electrically controlled bi-refringence [ECB] for controlling the color
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
Definitions
- the present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device using an OCB (Optically Compensated Birefringence) technique capable of realizing a wide viewing angle and high-speed response.
- OCB Optically Compensated Birefringence
- Liquid crystal display devices have been applied to various applications by taking advantage of their features of light weight, thinness, and low power consumption.
- a twisted nematic (TN) type liquid crystal display device has a liquid crystal material having an optically positive refractive index anisotropy, which is arranged between substrates by a twist of approximately 90 °. The optical rotation of incident light is adjusted by controlling the twist arrangement.
- this TN-type liquid crystal display device can be manufactured relatively easily, its view angle is narrow and its response speed is slow, so that it is not suitable for displaying moving images such as TV images.
- an OCB type liquid crystal display device has been receiving attention as a device for improving a viewing angle and a response speed.
- the OCB type liquid crystal display device has a bendable liquid crystal material sealed between the substrates.
- the response speed is improved by one digit compared to the TN type liquid crystal display device, and the alignment state of the liquid crystal material is further improved.
- the viewing angle is wide because it is optically self-compensated.
- the liquid crystal molecules are aligned along the direction of the electric field (aligned in the direction normal to the substrate) by applying a high voltage, but the liquid crystal molecules near the substrate are in contact with the alignment film.
- the light is not arranged in the normal direction due to the interaction, and the light is affected by the phase difference in a predetermined direction. For this reason, when observed from the normal direction of the substrate (the front direction of the display screen), the transmittance at the time of black display cannot be sufficiently reduced, and the contrast is lowered. So in the front direction, and further diagonally It is also known to combine an optically negative retardation plate with a hybrid arrangement as a technique for compensating the black display or the gradation characteristics sufficiently for observation from a direction (for example, see Patent Document 1). .
- Patent Document 1 JP-A-10-197862
- a color liquid crystal display device is a device that reflects or transmits incident light from a backlight or the like through natural light and high color rendering properties to display through each color filter layer. Select with the wavelength passband of the layer.
- An object of the present invention is to provide a liquid crystal display device having a high response speed and an excellent color balance.
- the applied voltage of at least the blue pixel electrode of the liquid crystal display cell during black display is made different from the applied voltage of the other color pixel electrode. As a result, unnecessary light leaking from the blue filter layer is suppressed, and the color balance is adjusted.
- the red, green, and blue lights of the spectral spectrum are the wavelength ranges that pass through each color filter layer.
- red light is 580 nm or more
- green light is 510-580 nm
- blue light is 400-550 nm.
- an array substrate in which pixel electrodes for red, green, and blue are arranged in a matrix on a display screen
- a counter substrate in which a counter electrode is arranged to face the pixel electrode of the array substrate;
- An alignment film formed on the pixel electrode and the counter electrode, respectively; a liquid crystal layer sandwiched between the array substrate and the counter substrate and arranged in a bend arrangement on the display screen;
- a red, green, and blue filter layer is provided on one of the substrates, and the red filter layer is disposed corresponding to the red pixel electrode, and the green filter layer is disposed corresponding to the green pixel electrode.
- a liquid crystal display cell comprising: a filter disposed so that the blue filter layer is disposed so as to correspond to the blue pixel electrode;
- the liquid crystal display cell and the phase difference plate are interposed between the liquid crystal display cell and the phase difference plate.
- the voltage applying means be different from the red and green pixel electrodes at least in the blue pixel electrode.
- the total retardation value of the liquid crystal layer of the liquid crystal cell and the phase difference plate at the time of black display on the display screen is zero at the positions of the red, green, and blue pixel electrodes, respectively. It is preferable that a different maximum voltage be applied to each of the red, green, and blue pixel electrodes.
- the total retardation value of the blue pixels becomes zero at a light wavelength shorter than 450 nm.
- the maximum applied voltage of the blue pixel electrode is higher than the maximum voltage at which the summed retardation value becomes zero.
- an array substrate in which red, green, and blue pixel electrodes are arranged in a matrix on a display screen
- a liquid crystal display cell comprising: a filter arranged so that the green filter layer is arranged corresponding to the pixel electrode for green; and the blue filter layer is arranged so as to correspond to the pixel electrode for blue.
- the liquid crystal display cell and the phase difference plate are interposed between the liquid crystal display cell and the phase difference plate.
- the polarizing plate It is arranged on one side of the polarizing plate, has an emission peak in a light wavelength range suitable for the red, green, and blue filter layers, and has a long wavelength side and a short wavelength side with respect to 450 nm in a blue wavelength range. And a backlight light source having an emission peak.
- the total retardation value of the blue pixel is zero at a light wavelength shorter than 450 nm! /.
- the maximum applied voltage of the blue pixel electrode is higher than the maximum voltage at which the combined retardation value becomes zero.
- the same effect can be obtained even when the maximum voltage of the blue pixel electrode is set to a voltage at which the Z value in the XYZ tristimulus values is minimized.
- the present invention can suppress, for example, a blue tint of a display image in black display of a display screen in an OCB mode liquid crystal display.
- a liquid crystal display cell and a retardation plate are combined, and the sum of these retardation values is varied to control the phase of transmitted light.
- liquid crystal If the retardation value of the display cell is Re,
- ne is the extraordinary light refractive index
- d is the thickness of the liquid crystal layer.
- the OCB liquid crystal layer using P-type liquid crystal with positive dielectric anisotropy has a positive retardation value, and the retarder combined with this has a negative retardation value.
- the light transmittance (T) when the liquid crystal display panel is composed of the liquid crystal display cell 11, the phase difference plate 20, and the pair of polarizing plates 22 arranged in a cross-col is expressed as follows. You.
- Ret is the sum of the retardation values of the liquid crystal layer and the retarder, V is the voltage applied to the liquid crystal layer, and ⁇ is the light wavelength.
- FIG. 13 shows an example of And ⁇ ⁇ with respect to the wavelength ⁇ in the liquid crystal layer used in the OCB mode display. The shorter the wavelength, the higher the value, and it is difficult to control even if a retarder with similar tendency is combined.
- FIG. 14 shows that in the liquid crystal display panel using the above-described cell of the liquid crystal layer having a uniform thickness, the red, green, and blue luminances in black display are normalized by the blue light luminance in the front direction of the display screen.
- the blue luminance ratio is far from the red and green luminance ratios, and it can be seen that light leakage due to short-wavelength light dispersion is likely to increase even in oblique visual fields.
- Fig. 15 is a u 'v' chromaticity diagram, where point A (0.195, 0.452) is the front in white display and point B (0.195, 0.452).
- FIG. 12 shows the spectral radiance characteristics of a typical cold-cathode fluorescent lamp used as a backlight light source, which has emission peaks in red, green, and blue regions, respectively, and filters the liquid crystal display cell.
- the red filter characteristic CR, the green filter characteristic CG, and the blue filter characteristic CB have transmittances including each emission peak. Further, assuming that 450 nm is the center of the blue light spectrum, the emission peaks are at 490 nm on the long wavelength side and 435 nm on the short wavelength side based on this.
- the transmittance (T) of a liquid crystal display panel including a retardation plate and a polarizing plate is minimized at one point at a certain wavelength.
- the transmittance increases.
- the present invention takes advantage of the fact that the retardation value (Re) of the liquid crystal layer changes in accordance with the applied voltage in the OCB mode as shown in equation (2), and the voltage applied to each of the red, green, and blue pixel electrodes is The difference is set so that the transmittance becomes minimum at a specific wavelength in the spectral region of each color.
- FIG. 16 shows u′v when the applied voltage of the blue pixel electrode is changed so that Ret in the blue light region becomes zero at a short wavelength of 450 nm or less during black display in the front direction of the display screen.
- the chromaticity diagram (CIE 1976UCS chromaticity diagram) is shown.
- the light source color is point A (0.208, 0.456), and the chromaticity B at the time of black display changes depending on the voltage.
- the applied voltage is 3V-5V as an example, and the force that reduces the voltage to VI (4.28V), V2 (4.15V), V3 (4.03V), and V4 (3.88V), v, there is a chromaticity point Bmax point (0. 188, 0.415) (V3) with the maximum value. Since the chromaticity Bmax is close to the point A, the color balance when displaying black is excellent.
- FIG. 17 shows the spectral characteristics in the blue region using the above voltage values VI-V4 as parameters.
- V3 the transmittance of 450nm or less among the bimodal emission peaks of the backlight source is most suppressed, thereby achieving a balanced chromaticity at the time of black display.
- FIG. 16 shows the chromaticity at the time of black display in front of the display screen.
- FIG. 18 shows changes in the Y and Z values (normalized values) and the V ′ chromaticity values of the XYZ tristimulus values with respect to the pixel voltage for blue.
- the V chromaticity becomes maximum with respect to the voltage value V3.
- FIG. 1 is a schematic configuration diagram of the OCB mode liquid crystal display device of the present embodiment.
- the liquid crystal display device 1 has a display screen with an aspect ratio of 16: 9 and a diagonal of 22 type, a light transmission type active matrix type liquid crystal display panel 100, and a plurality of tubular light sources 310 (FIG. 1). 1) arranged side by side and arranged on the back of the liquid crystal display panel, and a scanning line drive circuit Ydrl, Ydr2 built in the liquid crystal display panel 100 and supplying a scanning signal Vg to a scanning line Yj. (See Fig. 4), a signal line drive circuit 500 composed of a TCP (Tape Carrier Package) that supplies the signal voltage Vsig to the signal line Xi (see Fig. 4), and a counter electrode Ecom (see Fig.
- TCP Transmission Carrier Package
- the liquid crystal display panel 100 includes a common electrode driving circuit 700 for supplying the electrode voltage Vcom, a scanning line driving circuit Ydrl, Ydr2, a signal line driving circuit 500, and a control circuit 900 for controlling the common electrode driving circuit 700.
- 300 and picture frame bezel 1000 (see Figure 1) It is configured to be sandwiched between.
- the liquid crystal display panel 100 includes a liquid crystal display cell 110, a front hybrid retarder 200a, a front biaxial retarder 210a, a front polarizer 220a, a rear hybrid retarder 200b, and a rear hybrid retarder 200b. It comprises a biaxial retardation plate 210b and a rear polarizing plate 220b.
- the front hybrid retarder 200a, the front biaxial retarder 210a, and the front polarizer 220a are integrally formed, and similarly, the rear hybrid retarder 200b, the rear biaxial retarder 210b, and the rear polarizer are similarly configured.
- 220b is also integrally formed and attached to the main surface of the liquid crystal display cell 110, respectively.
- the liquid crystal display cell 110 includes an array substrate 120 in which display pixel electrodes Dpix, that is, a red pixel electrode dpixR, a green pixel electrode dpixG, and a blue pixel electrode dpixB, are arranged in a matrix.
- the liquid crystal layer 140 sandwiched between these alignment films also forms a force.
- the light-shielding film BM, the red filter layer CF (R), the green filter layer CF (G), and the blue filter layer CF (B) are regularly arranged on the main surface of the counter substrate 130.
- the display pixel electrode Dpix is an electrode that forms one pixel in a trio using the pixel electrode redxR for red, the pixel electrode dpixG for green, and the pixel electrode dpixB for blue for each subpixel, and is provided on the array substrate.
- the array substrate 120 will be described with reference to FIGS.
- the array substrate 120 is composed of a transparent glass substrate GLS1 and a signal line Xi composed of a plurality of aluminum (A1) and a scanning line Yj composed of a plurality of molybdenum-tungsten alloy (MoW). They are arranged in a matrix through an interlayer insulating film INS2 made of a silicon (Si02) film. In addition, an auxiliary capacitance line Cj formed in the same step as the scanning line Yj is arranged in parallel with the scanning line Yj.
- a transparent electrode is formed as a transparent electrode through a passivation film INS3 on a top-gate thin film transistor TFT with a polycrystalline silicon (p-Si) film as the active layer. ) Is disposed.
- this TFT has a double gate structure to reduce off-leak current, and has a P-type source'drain region p-Si (s), p-Si (d), and a channel region p-Si (cl ), p-Si (c2), channel region P-Si (cl), connection region p-Si (i) arranged between p-Si (c2) in p-Si film, drain region p -Si (d) is connected to the signal line Xi via the contact hole CH1, and the source region p-Si (s) is routed by the source wiring EXT composed of A1 via the contact hole CH2 and via the contact hole CH3. Connected to the display pixel electrode Dpix.
- a gate insulating film INS1 made of TEOS is arranged on the p-Si film, and a scanning line Yj An extended first gate electrode Gl is arranged, and a part of the scanning line Yj is wired as a second gate electrode G2. Then, the first gate electrode G1 corresponds to the first channel region p-Si (cl), and the second gate electrode G2 corresponds to the second channel region P-Si (c2).
- the source region P-Si (s) of the TFT includes a source region extension P-Si (se) (FIG. 6), and extends from the auxiliary capacitance line Cj and is formed in the same process as the auxiliary capacitance line Cj. It is electrically connected via a contact hole CH4 to a second auxiliary capacitance electrode EC2, which is disposed on the first auxiliary capacitance electrode EC1 made of and via an interlayer insulating film INS2.
- the second auxiliary capacitance electrode EC2 is composed of A1 formed in the same step as the signal line Xi.
- a pixel electrode Tpix for phase transition formed in the same process as the pixel electrode Dpix for display is disposed on the second auxiliary capacitance electrode EC2 via the passivation film INS3, and the pixel electrode Tpix for phase transition is provided in the contact hole CH5. And is electrically connected to the second storage capacitor electrode EC2 via.
- a storage capacitor Cs (FIG. 4) is formed between the first storage capacitor electrode EC1 and the second storage capacitor electrode EC2, and the pixel electrode Tpix for phase transition is disposed on the storage capacitor Cs. Therefore, it is possible to effectively secure a large storage capacitor Cs without impairing the aperture ratio.
- the display pixel electrode Dpix and the phase transition pixel electrode Tpix are arranged so as to straddle the scanning line Yj, and the source region p-Si (s) of the TFT has an independent source region extension p. -Si (se), even if the storage capacitor Cs is short-circuited, the source region extension P-Si (se) can be electrically disconnected by means such as laser irradiation. The relief is easy.
- the display pixel electrode Dpix and the phase transition pixel electrode Tpix of the next horizontal line adjacent on the auxiliary capacitance line Cj are formed in a comb-like shape whose opposing edges are aligned with each other. This is because by applying a twisted lateral electric field between the display pixel electrode Dpix and the phase transition pixel electrode Tpix, it is possible to uniformly form bend nuclei, and from the initial spray arrangement state. It is possible to uniformly lead to a bend arrangement state.
- This comb tooth pitch for example, less than 50 m, preferably 20-30 m, makes it possible to lead to a uniform arrangement at low voltage.
- both ends of the scanning line Yj are respectively located on the glass substrate GLS1. It is electrically connected to a physically configured scanning line driving circuit Ydrl, Ydr2. Then, the vertical scanning clock signal YCK and the vertical start signal YST are input to the scanning line driving circuits Ydrl and Ydr2, respectively.
- Each of the storage capacitance lines Cj is connected to the connection wiring Ccs at both ends, and the storage capacitance voltage Vcs is input through the connection wiring Ccs.
- the selection switch SEL1 connected to one of the odd signal line pairs and the selection switch SEL4 connected to one of the even signal line pairs are connected to the first signal input line xk + 1.
- the selection switch SEL3 selected by the selection signal Vsell and connected to the other of the odd signal line pairs and the selection switch SEL2 connected to the other of the even signal line pairs are S-lined so as to be selected by the second selection signal Vsel2. ing.
- the display pixel electrode Dpix corresponding to the signal line XI has a positive polarity (+) with respect to the counter electrode voltage Vcom.
- the signal voltage Vsig4 is written to the display pixel electrode Dpix corresponding to the signal line X4 with the signal voltage Vsig4 having a negative polarity (one) with respect to the counter electrode voltage Vcom.
- the display pixel electrode Dpix corresponding to the signal line X2 has a negative (1-) signal voltage Vsig2 with respect to the counter electrode voltage Vcom, and the display pixel electrode corresponding to the signal line X3.
- a positive (+) signal voltage Vsig3 with respect to the common electrode voltage Vcom is written to Dpix. Further, as shown in FIG. 8 (b), in the first half of one horizontal scanning period (1H) of the next frame, the display pixel electrode Dpix corresponding to the signal line XI has a negative polarity (one polarity) with respect to the opposite electrode voltage Vcom. ) Is written to the display pixel electrode Dpix corresponding to the signal line X4 with the positive (+) signal voltage Vsig4 with respect to the counter electrode voltage Vcom.
- the display pixel electrode Dpix corresponding to the signal line X2 has a positive (+) signal voltage Vsig2 with respect to the common electrode voltage Vcom, and the display pixel electrode corresponding to the signal line X3.
- a signal voltage Vsig3 having a negative polarity (one) with respect to the counter electrode voltage Vcom is written to the electrode Dpix.
- connection pitch limit accompanying high definition can be widened, and high definition of, for example, 80 m or less can be achieved.
- the signal voltage Vsig input from a certain signal input line is serially distributed to every other two signal lines Xi and Xi + 2 within one horizontal scanning period (1H).
- a red signal, a green signal, and a blue signal are input to the signal input line xk.
- red signal Vsigl (R), Vsig4 (R), green signal Vsig2 (G), blue signal Vsig3 (B), signal lines XI and X4 are for red (R), and signal line X2 is green ( G) and signal line X3 is for blue (B).
- the signal voltage at the time of black display is selected to be the maximum voltage (ON voltage), and the signal drive circuit 500 applies a signal in a predetermined range applied between the counter electrode and each color pixel electrode. Output voltage. The gradation is controlled by each applied voltage value. In addition, the output is performed so that the maximum voltage value differs for each color.
- the maximum red signal voltage is 4.70V
- the maximum green signal voltage is 4.47V
- the maximum blue signal voltage is 4.03V.
- the maximum voltage at the time of black display of the green signal is variable and the light wavelength at which the total retardation value Ret of the liquid crystal display cell and the phase difference plate is zero is selected to be shorter than 450 nm, u'v in the front direction of the display screen is selected. Adjust so that the 'v' value of the chromaticity diagram becomes the maximum value.
- the counter substrate 130 is a matrix-type light-shielding film BM that blocks unwanted leakage light on a glass substrate GLS2, and a filter CF for color display.
- a transparent counter electrode Ecom composed of filter layers CF (R), CF (G), CF (B), and ITO provided for the pixel electrodes dpixR, dpixG, and dpixB for each of red R, green G, and blue B It is provided and configured. Note that CF (R), CF (G), and CF (B) are sequentially arranged adjacently.
- an oily column spacer is arranged on the counter electrode Ecom, so that one pixel is regularly arranged for a plurality of pixels so as to maintain a gap with the array substrate 110.
- Are located in The position corresponding to the space on the array substrate is the wide area Xa on the signal line shown in FIG.
- the alignment films 151 and 153 disposed on the main surfaces of each array and the opposing substrates 120 and 130 have the rubbing directions Ra and Rb (see FIGS. 9 and 10) directed downward on the screen of the substrates 120 and 130. Rubbing treatment is performed so as to be substantially parallel to each other and in the same direction.
- the pretilt angle ( ⁇ ) is set to approximately 10 °.
- a liquid crystal layer 140 is sandwiched between the two substrates 120 and 130.
- As the liquid crystal layer 140 a P-type nematic liquid crystal having a positive dielectric anisotropy with a liquid crystal molecule in a bend arrangement when a predetermined voltage is applied to the display pixel electrode Dpix and the counter electrode Ecom is used.
- a nucleus is formed by giving a torsional potential difference, and phase transition is performed around this nucleus.
- phase transition is performed around this nucleus.
- the absorption axes Aa and Ab of the pair of polarizing plates 220a and 220b are connected to each other so that a black display is obtained when the ON voltage Von (maximum voltage) is applied.
- the array should be orthogonal and shifted from the rubbing directions Ra and Rb by ⁇ 4.
- the front hybrid retarder 200a and the rear hybrid plate 200b which are attached between the outer surfaces of the array substrate 120 and the counter substrate 130 and the polarizers 220a and 220b, are connected to the on-voltage (black display).
- the hybrid retardation plate 200a, discotic liquid crystal constituting the 200b is refractive Oriritsu nx and ny Hitoshi Toga signaling refractive index of the optical axis direction nz are n X, a small optical negative material der than ny As shown in FIGS.
- the molecular optical axis Dopt is tilted in a direction opposite to the tilt direction of the optical axis of the liquid crystal molecules 140a of the liquid crystal layer 140, and the tilt angle gradually changes in the film thickness direction.
- the retardation values RD are each comprised of -40 nm! Therefore, since the retardation RLCon of the liquid crystal layer 140 at the time of black display is 80 nm, the phase difference at the time of black display is canceled out, thereby preventing unwanted light leakage.
- biaxial retardation plates 210a and 210b are arranged between the hybrid retardation plates 200a and 200b and the polarizing plates 220a and 220b, respectively.
- the biaxial retardation plates 210a and 210b prevent light leakage due to the optical rotation of the liquid crystal layer 140 in an oblique direction, and are retarded by the absorption axes Aa and Ab of the polarization plates 220a and 220b, respectively. Ad matches. Therefore, the phase difference from the front direction can be made substantially zero by the combination with the polarizing plates 220a and 220b, and only the chromatic dispersion in the oblique direction can be selectively improved practically.
- the backlight light source 300 arranged facing the rear polarizing plate 220b will be described with reference to FIG.
- the knock light source 300 includes a plurality of tubular light sources 310 arranged side by side as shown in the figure, and efficiently emits the light from the tubular light sources 310 to the front and collects the tubular light sources 310. It comprises a reflector 320 made of resin to be housed, and an optical sheet disposed between the polarizing plate 220b (see FIG. 3) and the tubular light source 310.
- the optical sheet is, for example, a 3M company in which a plurality of prism arrays for emitting light source light emitted from the tubular light source 310 are arranged. It consists of prism sheets 350 and 360 such as BEFIII.
- the tubular light source 310 is constituted by a high color rendering lamp represented by a three-wavelength cold cathode fluorescent tube, has an emission spectrum as shown by a curve A in Fig. 12 as an example, and has a peak at 610 nm. It has a red light region with peaks, a green light region with a peak at 540 nm, and a blue light region with peaks at 490 nm and 435 nm.
- the emission phosphors excited by 147 nm ultraviolet rays are Y203: Eu phosphor for red, LaP04: Ce, Tb phosphor for green, and BAM phosphor for blue. Although other phosphors are often used, there is not much difference in the emission spectrum for obtaining high color rendering.
- Each of the color filter layers CF (R), CF (G), and CF (B) of the liquid crystal display cell has a pass characteristic C that shares these light wavelengths, and the red filter layer CF (R) is like CR
- the green filter layer CF (G) has a transmission characteristic of 580-510 nm like CG and the blue filter layer CF (B) has a transmission characteristic of 550-400 nm like CB.
- the incident light emitted from the front two-axis phase difference plate 210a Becomes elliptically polarized light and reaches the front polarizer 220a, where light is emitted according to the polarization state.
- a gray scale display can be performed.
- the maximum voltage of the red pixel electrode is raised or lowered as compared with the others. If the screen has a green tint, the maximum voltage of the pixel electrode for green is controlled by, for example, raising the maximum voltage of the pixel electrode of another color. It can be set to be different from the maximum voltage.
- FIG. 1 is a schematic configuration diagram of a liquid crystal display device according to a first embodiment of the present invention.
- FIG. 2 is a partial schematic cross-sectional view of a liquid crystal display cell of Embodiment 1.
- FIG. 3 is a partially enlarged schematic cross-sectional view of the liquid crystal display panel of Embodiment 1.
- FIG. 4 is a schematic equivalent circuit diagram of the liquid crystal display cell of Embodiment 1.
- FIG. 5 is a partial schematic front view of the array substrate of the first embodiment.
- FIG. 6 is a partial schematic front view of the array substrate of the first embodiment.
- FIG. 7 (a) is a partial schematic cross-sectional view of the array substrate taken along line BB in FIG. 6, and (b) is a partial schematic cross-sectional view of the array substrate taken along line CC.
- FIGS. 8A and 8B are diagrams for explaining a display state according to the first embodiment.
- FIG. 9 is a schematic configuration diagram of a liquid crystal display panel of Embodiment 1.
- FIG. 11 is a schematic sectional view of a backlight according to the first embodiment.
- FIG. 12 is a curve diagram showing spectral radiance characteristics of a backlight lamp and spectral transmittances of red, green, and blue filter layers.
- FIG. 13 is a diagram showing an AndZ ⁇ characteristic curve with respect to the wavelength of the liquid crystal layer for explaining the present invention.
- FIG. 14 is a curve diagram showing each color brightness ratio with respect to a display screen front and oblique viewing directions for explaining the present invention.
- FIG. 15 is a uV chromaticity diagram for explaining the present invention.
- FIG. 16 is a u'v 'chromaticity diagram when the maximum voltage value of a blue pixel electrode during black display is changed for explaining the present invention.
- FIG. 17 is a curve diagram showing spectral luminance characteristics in a blue region for explaining the present invention.
- FIG. 18 is a curve diagram showing normalized values of ⁇ ⁇ and Z luminance and v ′ chromaticity value with respect to a blue pixel voltage for explaining the present invention.
- FIG. 19 is a schematic configuration diagram of a general OCB mode liquid crystal display cell.
- dpixR pixel electrode for red
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- Computer Hardware Design (AREA)
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Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005516133A JP4836580B2 (ja) | 2003-12-11 | 2004-12-08 | 液晶表示装置 |
US10/582,237 US7623202B2 (en) | 2003-12-11 | 2004-12-08 | Liquid crystal display device |
CN200480036491XA CN1890599B (zh) | 2003-12-11 | 2004-12-08 | 液晶显示装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003-412668 | 2003-12-11 | ||
JP2003412668 | 2003-12-11 |
Publications (1)
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WO2005057276A1 true WO2005057276A1 (ja) | 2005-06-23 |
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Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/018269 WO2005057276A1 (ja) | 2003-12-11 | 2004-12-08 | 液晶表示装置 |
Country Status (6)
Country | Link |
---|---|
US (1) | US7623202B2 (ja) |
JP (1) | JP4836580B2 (ja) |
KR (1) | KR100880749B1 (ja) |
CN (1) | CN1890599B (ja) |
TW (1) | TWI264591B (ja) |
WO (1) | WO2005057276A1 (ja) |
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AU2003237424A1 (en) | 2002-06-06 | 2003-12-22 | Donnelly Corporation | Interior rearview mirror system with compass |
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US7446924B2 (en) | 2003-10-02 | 2008-11-04 | Donnelly Corporation | Mirror reflective element assembly including electronic component |
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JP4794157B2 (ja) * | 2004-11-22 | 2011-10-19 | 三洋電機株式会社 | 表示装置 |
EP1883855B1 (en) | 2005-05-16 | 2011-07-20 | Donnelly Corporation | Vehicle mirror assembly with indicia at reflective element |
TWI384277B (zh) * | 2007-09-07 | 2013-02-01 | Japan Display West Inc | 液晶顯示裝置 |
US8154418B2 (en) | 2008-03-31 | 2012-04-10 | Magna Mirrors Of America, Inc. | Interior rearview mirror system |
JP2011128559A (ja) * | 2009-12-21 | 2011-06-30 | Toshiba Mobile Display Co Ltd | シャッター眼鏡 |
KR101117736B1 (ko) * | 2010-02-05 | 2012-02-27 | 삼성모바일디스플레이주식회사 | 디스플레이 장치 |
JP5618626B2 (ja) * | 2010-05-27 | 2014-11-05 | エルジー ディスプレイ カンパニー リミテッド | 液晶表示素子及びその駆動方法 |
KR101880710B1 (ko) * | 2011-12-01 | 2018-07-24 | 엘지디스플레이 주식회사 | 경량 박형의 액정표시장치 제조방법 |
KR101935780B1 (ko) * | 2012-06-01 | 2019-01-07 | 엘지디스플레이 주식회사 | 액정표시장치 제조라인 |
CN102998858A (zh) * | 2012-12-11 | 2013-03-27 | 京东方科技集团股份有限公司 | 阵列基板、显示面板、显示装置及其控制方法 |
JP2015222346A (ja) * | 2014-05-23 | 2015-12-10 | 株式会社ジャパンディスプレイ | 表示装置及び電子機器 |
CN106707623A (zh) * | 2017-03-01 | 2017-05-24 | 合肥鑫晟光电科技有限公司 | 一种显示基板及显示装置 |
US11131891B2 (en) * | 2017-07-13 | 2021-09-28 | Sharp Kabushiki Kaisha | Liquid crystal display device |
CN108831394B (zh) * | 2018-06-29 | 2021-12-28 | 北京小米移动软件有限公司 | 界面显示方法和装置 |
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- 2004-12-08 US US10/582,237 patent/US7623202B2/en not_active Expired - Fee Related
- 2004-12-08 CN CN200480036491XA patent/CN1890599B/zh not_active Expired - Fee Related
- 2004-12-08 KR KR1020067011353A patent/KR100880749B1/ko active IP Right Grant
- 2004-12-08 JP JP2005516133A patent/JP4836580B2/ja active Active
- 2004-12-10 TW TW093138448A patent/TWI264591B/zh not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
---|---|
US7623202B2 (en) | 2009-11-24 |
TW200523617A (en) | 2005-07-16 |
TWI264591B (en) | 2006-10-21 |
CN1890599A (zh) | 2007-01-03 |
CN1890599B (zh) | 2010-05-26 |
JP4836580B2 (ja) | 2011-12-14 |
US20070164956A1 (en) | 2007-07-19 |
KR20060103446A (ko) | 2006-09-29 |
KR100880749B1 (ko) | 2009-02-02 |
JPWO2005057276A1 (ja) | 2007-12-13 |
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