CN100593744C - Image display device having wide and narrow viewing angle modes and method of driving the same - Google Patents

Image display device having wide and narrow viewing angle modes and method of driving the same Download PDF

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CN100593744C
CN100593744C CN200610168310A CN200610168310A CN100593744C CN 100593744 C CN100593744 C CN 100593744C CN 200610168310 A CN200610168310 A CN 200610168310A CN 200610168310 A CN200610168310 A CN 200610168310A CN 100593744 C CN100593744 C CN 100593744C
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pixel
sub
image
row
brightness
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CN101097318A (en
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洪炯基
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LG Display Co Ltd
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LG Display Co Ltd
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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
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/302—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays
    • H04N13/31—Image reproducers for viewing without the aid of special glasses, i.e. using autostereoscopic displays using parallax barriers

Abstract

An image display device includes a display panel, and a barrier including a plurality of transmissive portions and a plurality of blocking portions on the display panel, wherein the plurality of transmissive portions and the plurality of blocking portions are arranged in a matrix, wherein 3N<th >rows and (3N-1)<th >rows include the plurality of transmissive portions and the plurality of blocking portions, N being a positive integer, (3N-2)<th >rows include the plurality of transmissive portions excluding the plurality of blocking portions, , and the transmissive and blocking portions are alternately arranged.

Description

Image display device and driving method with wide and narrow viewing angle modes
It is the right of priority of the korean patent application of 2006-0057987 that the present invention requires to enjoy the application number that proposed on June 27th, 2006, at this that its full content is as a reference incorporated.
Technical field
The present invention relates to a kind of display device, relate in particular to a kind of display device and driving method thereof with wide and narrow viewing angle modes.Although embodiments of the present invention are suitable for wide range of applications, it is particularly suited for being provided at convertible display device and driving method thereof between the wide and narrow viewing angle modes.
Background technology
Usually, liquid crystal display (LCD) device as image display device comprises first substrate, second substrate and liquid crystal layer.First and second substrates toward each other and separate each other.Liquid crystal layer is clipped between this first and second substrate.The optical anisotropy and the polarizability of LCD devices use liquid crystal molecule come display image.
The LCD device comprises at least one polaroid that is positioned on first and second substrates.Only the light in the predetermined direction vibration just can pass polaroid, thereby this polaroid produces polarized light.
The visual angle is an important factor in the LCD device.Therefore, proposed to have the LCD device at wide visual angle.For example, twisted nematic liquid crystal (TN liquid crystal) unit and compensate film are used for the LCD device to obtain wide visual angle.
Fig. 1 is the decomposition diagram according to the wide visual angle LCD device that comprises TN liquid crystal cells and uniaxial retardation film of prior art.In Fig. 1, wide visual angle LCD device 10 comprises TN liquid crystal cells 15, two uniaxial retardation film 13, first polaroid 11 and second polaroids 17.Two uniaxial retardation film 13 are arranged on the TN liquid crystal cells 15.First polaroid 11 is arranged on the uniaxial retardation film 13, and second polaroid 17 is arranged under the TN liquid crystal cells 15.In other words, two uniaxial retardation film 13 and TN liquid crystal cells are arranged between first and second polaroids 11 and 17.
Usually, comprise that the LCD device of TN unit has narrow visual angle, and user's viewing location is depended in the brightness of this LCD device.This problem is caused by the refractive index anisotropy of liquid crystal molecule in the TN liquid crystal cells, although compensated the visual angle to a certain extent by two uniaxial retardation film 13 are set between first polaroid 11 and TN liquid crystal cells 15.
The polarized light of vertically injecting uniaxial retardation film can not change by uniaxial retardation film.Yet the polarized light that tilts to inject uniaxial retardation film can change by uniaxial retardation film.Thereby when polarized light was vertically injected two uniaxial retardation film 13, this vertical incidence polarized state of light did not change.In addition, when polarized light tilts to inject two uniaxial retardation film 13, because these two uniaxial retardation film, 13 its polarization states will change.Birefraction by controlling two uniaxial retardation film 13 to be compensating narrow visual angle, thereby improves the visual angle of the LCD device with TN liquid crystal cells 15.Therefore, the LCD device among Fig. 1 has wide visual angle.Yet this LCD device does not provide the various visual angles pattern and do not have convertibility between wide visual angle and narrow visual angle.
Fig. 2 is the decomposition diagram that has the LCD device of convertibility according to prior art between wide and narrow viewing angle modes.As shown in Figure 2, the LCD device 50 with the convertibility between wide and narrow viewing angle modes comprises wide field-of-view mode liquid crystal cells 55, auxiliary parallel alignment unit 53 and first and second polaroids 51 and 57.First and second polaroids 51 and 57 are separately positioned on the outside surface of wide field-of-view mode liquid crystal cells 55 and auxiliary parallel alignment unit 53.
The aligning direction of auxiliary parallel alignment unit 53 is parallel to the optical axis of first polaroid 51, and the liquid crystal molecule in auxiliary parallel alignment unit 53 is arranged in parallel with each other, and does not have distorted shape.The LCD device 50 that comprises auxiliary parallel alignment unit 53 produces the image with change color clearly rather than color degradation.In addition, the LCD device 50 that comprises auxiliary parallel alignment unit 53 has narrow visual angle at left and right sides and upper and lower sides.
Therefore, the LCD device that comprises auxiliary parallel alignment unit 53 can be changed between wide and narrow viewing angle modes.When the voltage that does not apply voltage or will be lower than threshold value to auxiliary parallel alignment unit 53 was applied to auxiliary parallel alignment unit 53, the LCD device had wide field-of-view mode.In addition, when the voltage that will be higher than threshold value was applied to auxiliary parallel alignment unit 53, the LCD device had narrow field-of-view mode.
More specifically, when the voltage that does not apply voltage or will be lower than threshold value to auxiliary parallel alignment unit 53 was applied to auxiliary parallel alignment unit 53, the aligning direction of auxiliary parallel alignment unit 53 was identical with the optical axis of first polaroid 51.Therefore, the light by wide field-of-view mode liquid crystal cells 55 passes first polaroid 51, and the LCD device has wide field-of-view mode.Yet when the voltage that will be higher than threshold value was applied to auxiliary parallel alignment unit 53, the liquid crystal molecule in the auxiliary parallel alignment unit 53 was rearranged for the optical axis perpendicular to first polaroid, makes the visual angle of side degenerate.Therefore, the LCD device provides narrow field-of-view mode.
In any case said units does not prevent well at side generation image.It can change the phase place of light and can not stop light.Therefore, display image on the side of LCD device, and still can observe image the people of side.Like this, even under narrow field-of-view mode, can not provide enough maintaining secrecy for the user according to the LCD device of prior art.
Summary of the invention
Therefore, the invention provides a kind of image display and driving method thereof, it has been eliminated substantially because the limitation of prior art and one or more problems that defective causes.
One object of the present invention is to provide a kind of image display and driving method thereof, and it has the convertibility between wide and narrow viewing angle modes.
Another object of the present invention is to provide a kind of image display and driving method thereof, it has good side image and blocks characteristic under narrow field-of-view mode, thereby increases user's confidentiality.
A further object of the present invention provides a kind of image display device and driving method thereof, and its side image that can prevent cross-interference issue and have a further improvement blocks characteristic.
Further feature of the present invention and advantage will be illustrated in instructions, and part is obviously from instructions, maybe can understand by embodiments of the present invention.Purpose of the present invention and other advantages can be realized and acquisition by the structure that particularly points out in written instructions and claims and accompanying drawing.
For the advantage that obtains these and other and according to purpose of the present invention, as concrete and broadly described at this, the barrier that a kind of image display device comprises display panel and comprise a plurality of transmission parts and a plurality of stop portions on display panel, wherein a plurality of transmission parts and a plurality of stop portions are arranged in matrix shape, wherein (3N) row comprises a plurality of transmissions parts and a plurality of stop portions with (3N-1) going, N is a positive integer, (3N-2) row comprises a plurality of transmission parts of getting rid of a plurality of stop portions, and transmission part and alternately arrangement of stop portions.
In another program of the present invention, a kind of image display device comprises display panel and barrier, this barrier comprises first row, second row and the third line, wherein this first row is basic is transmission, second row has a plurality of first transmission parts and a plurality of first stop portions, and the third line has a plurality of second transmission parts and a plurality of second stop portions, and first transmission part and first stop portions are partly aimed at second stop portions and second transmission respectively.
In another program of the present invention, a kind of driving method that comprises the image display device of a plurality of image pixels unit, wherein this image display device is operated in wide and narrow viewing angle modes convertibly, each a plurality of pixel cell has first to the 6th image pixel of the matrix shape that is arranged as two row triplex rows, this method comprises when working in narrow field-of-view mode, first to the 6th picture signal is applied to first to the 6th image pixel respectively, and the 3rd and the 6th picture signal is different from the 4th and the 5th picture signal; And when working in wide field-of-view mode, the 3rd and the 6th picture signal that will be identical with the 4th and the 6th picture signal is applied to the 3rd and the 6th image pixel.
Should be appreciated that above-mentioned general description that the present invention is carried out and following detailed description are exemplary with indicative, and aim to provide the further explanation of the present invention for required protection.
Description of drawings
The accompanying drawing that the present invention comprised is used for further understanding the present invention, and is combined in a part that constitutes instructions in the instructions, and described accompanying drawing illustrates embodiments of the invention and explains principle of the present invention with instructions.In the drawings:
Fig. 1 is the decomposition diagram according to the wide visual angle LCD device that comprises TN liquid crystal cells and uniaxial retardation film of prior art;
Fig. 2 is for having the decomposition diagram of the LCD device of the convertibility between wide and narrow viewing angle modes according to prior art;
Fig. 3 is for explaining the sectional view be used for according to the principle of work of the observation district generation unit of the image display device of embodiment of the present invention;
Fig. 4 A and Fig. 4 B illustrate respectively and are used for according to the part display panel of the image display device of embodiment of the present invention and the planimetric map of part barrier;
Fig. 5 A and Fig. 5 B observe district's planimetric map of observed image pixel respectively according to the image display device of embodiment of the present invention first and second;
Fig. 6 is the synoptic diagram that is applied to according to the picture carrier of the image display device of embodiment of the present invention;
Fig. 7 is the floor map according to the situation of the image display device display image of embodiment of the present invention;
Fig. 8 is the schematic cross-section according to the barrier of the image display device of embodiment of the present invention;
Fig. 9 A is respectively at the different barrier of the image display device of distinguishing and the planimetric maps of sub-pixel observed with 9B; And
Figure 10 is the gamma signature tune line chart that is used for according to each pixel of image display device of the present invention.
Embodiment
Specifically describe the preferred implementation of example illustrated in the accompanying drawings hereinafter with reference to accompanying drawing.
Fig. 3 is for explaining the sectional view that is used for according to the observation district generation unit of image display device of the present invention.In Fig. 3, image display device 110 comprises display panel 120 and barrier 130.Barrier 130 is arranged on the front of display panel 120.Display panel 120 produces first and second images " IM1 " and " IM2 ", and barrier 130 is as observing district's generation unit.On display panel 120, limit the first and second image pixel " P IM1" and " P IM2".First and second image pixel " the P IM1" and " P IM2" on display panel 120, alternately arrange.Barrier 130 comprises that transmission part 132 and stop portions 134 are optionally to pass through from the first and second image pixel " P IM1" and " P IM2" light.The light of all or real mass is by transmission part 132, and the light of all or real mass stops by stop portions 134.Transmission part 132 and stop portions 134 are alternately arranged.
Therefore, from the first image pixel " P that produces by display panel 120 IM1" the first image I M1 through the transmission part 132 of barrier 130, observe district " VZ1 " thereby form first.From the second image pixel " P that produces by display panel 120 IM2" the second image I M2 through the transmission part 132 of barrier 130, observe district " VZ2 " thereby form second.For example, first observes the middle body that district " VZ1 " is formed on display panel 120, and the second observation district " VZ2 " is formed on first two side portions of observing district " VZ1 ".Observe district " VZ1 " first and second and receive different images with user in " VZ2 ".
First and second image pixel " the P IM1" and " P IM2" between second width " W2 ", the 3rd width " W3 " and first and second distances " E " of observing between the district " VZ1 " and " VZ2 " of stop portions 134 of first width " W1 ", transmission part 132 form following equation:
W1+W2＝2/(1/E+1/W)
Barrier 130 is set and produces by front from the first and second image pixel " P at display panel 120 IM1" and " P IM2" different images, this image display device 110 is observed in the district " VZ1 " and " VZ2 " first and second and is shown first and second images " IM1 " and " IM2 " respectively.
Fig. 4 A and Fig. 4 B illustrate respectively and are used for according to the part display panel of the image display device of embodiment of the present invention and the planimetric map of part barrier.Horizontal direction among Fig. 4 A and Fig. 4 B shows the horizontal direction of this image display device when the user observes image display device.Shown in Fig. 4 A, display panel 120 comprises a plurality of image pixels unit " UP ".A plurality of image pixels unit " UP " is arranged in matrix shape.Each a plurality of image pixels unit comprises first to the 6th image sub-pixel " P1 ", " P2 ", " P3 ", " P4 ", " P5 " and " P6 ".First to the 6th image sub-pixel " P1 ", " P2 ", " P3 ", " P4 ", " P5 " and " P6 " have 3 * 2 matrix shape.The first and second image sub-pixels " P1 " and " P2 " alternately arrange in (3N-2) of display panel 120 row, and N is a positive integer.The third and fourth image sub-pixel " P3 " and " P4 " alternately arrange in (3N-1) of display panel 120 row.The the 5th and the 6th image pixel " P5 " and " P6 " alternately arrange in (3N) of display panel 120 row.Each first to the 6th image sub-pixel " P1 ", " P2 ", " P3 ", " P4 ", " P5 " and " P6 " show the image that differs from one another, perhaps the identical image of some demonstrations among each first to the 6th image sub-pixel " P1 ", " P2 ", " P3 ", " P4 ", " P5 " and " P6 ".For example and first to the 6th image sub-pixel " P1 ", " P2 ", " P3 ", " P4 ", " P5 " show identical images with wherein four image sub-pixels in " P6 ".
Shown in Fig. 4 B, barrier 130 comprises a plurality of transmission parts 132 and a plurality of stop portions 134.A plurality of transmission parts 132 and a plurality of stop portions 134 alternately are arranged in matrix shape.Transmission part 132 can be arranged in (3N-2) row of the barrier 130 with any stop portions.In addition, transmission part 132 and stop portions 134 be arranged alternately in barrier 130 (3N-1) row and (3N) row in.
For example, do not comprise that the transmission part 132 of stop portions 134 is arranged in first row " R1 ", and transmission part 132 and stop portions 134 are arranged alternately in second row " R2 ".Transmission part 132 and stop portions 134 are arranged alternately in the third line " R3 ".In addition, the transmission part 132 in the third line " R3 " is corresponding to the stop portions 134 in second row " R2 ", and the stop portions 134 in the third line " R3 " is corresponding to the transmission part 132 in second row " R2 ".Other row of barrier 130 can have the arrangement of this triplex row.
Because the first and second image sub-pixels " P1 " and " P2 " be corresponding to first row " R1 ", be presented at first and second from the image of the first and second image sub-pixels " P1 " and " P2 " and observe and distinguish in " VZ1 " and " VZ2 ".Therefore, user's total energy receives the image from the first and second image sub-pixels " P1 " and " P2 ".Because the third and fourth image sub-pixel " P3 " and " P4 " corresponding to second row " R2 ", are presented at first and second from the image of the third and fourth image sub-pixel " P3 " and " P4 " and observe in one of them that distinguish " VZ1 " and " VZ2 ".For example, when the image from the 3rd image sub-pixel " P3 " is presented at first when observing in the district " VZ1 ", is presented at second from the image of the 4th image sub-pixel " P4 " and observes in the district " VZ2 ".
Similarly, because the 5th and the 6th image sub-pixel " P5 " and " P6 " be corresponding to the third line " R3 ", be presented at first and second from the image of the 5th and the 6th image sub-pixel " P5 " and " P6 " and observe in one of them of district " VZ1 " and " VZ2 ".For example, when the image from the 5th image sub-pixel " P5 " is presented at first when observing in the district " VZ1 ", is presented at second from the image of the 6th image pixel " P6 " and observes in the district " VZ2 ".
According to the embodiment of the present invention, the third and fourth image sub-pixel " P3 " and " P4 " correspond respectively to stop portions 134 and transmission part 132, and the 5th and the 6th image sub-pixel " P5 " and " P6 " correspond respectively to transmission part 132 and stop portions 134.Perhaps, the third and fourth image sub-pixel " P3 " and " P4 " can correspond respectively to transmission part 132 and stop portions 134, and the 5th and the 6th image sub-pixel " P5 " and " P6 " can correspond respectively to stop portions 134 and transmission part 132.
And as mentioned above, the transmission part 132 in the third line " R3 " is corresponding to the stop portions 134 in second row " R2 ", and the stop portions 134 in the third line " R3 " is corresponding to the transmission part 132 in second row " R2 ".Yet the transmission part 132 in the third line " R3 " can be corresponding to the transmission part 132 of second row in " R2 ", and the stop portions 134 in the third line " R3 " can be corresponding to the stop portions 134 in second row " R2 ".
Fig. 5 A and Fig. 5 B observe district's planimetric map of observed image pixel respectively according to the image display device of embodiment of the present invention first and second.Shown in Fig. 5 A, when the user in the first observation district VZ1 (shown in Figure 3) observes image display device 110, because the stop portions in barrier 130 (shown in Fig. 4 B) does not show the image from the 3rd and the 6th image sub-pixel " P3 " and " P6 " (shown in Fig. 4 A).From first, second, the image of the 4th and the 5th image sub-pixel " P1 ", " P2 ", " P4 " and " P5 " passes the transmission part 134 in the barrier 130 (shown in Fig. 4 B) and is presented at first and observe in district's " VZ1 " (shown in Figure 3).Therefore, first observe user in the district " VZ1 " can be observed from first, second, the image of the 4th and the 5th image sub-pixel " P1 ", " P2 ", " P4 " and " P5 ".When the picture signal that will produce required image is applied to first, second, when the 4th and the 5th image sub-pixel " P1 ", " P2 ", " P4 " and " P5 ", can be observed required image first user who observes in district's " VZ1 " (shown in Figure 3).
Shown in Fig. 5 B, when the user in the second observation district VZ2 (shown in Figure 3) observes image display device 110, because the stop portions in barrier 130 (shown in Fig. 4 B) does not show the image from the 4th and the 5th image sub-pixel " P4 " and " P5 " (shown in Fig. 4 A).Pass the transmission part 134 in the barrier 130 (shown in Fig. 4 B) and be presented at second from the image of the first, second, third and the 6th image pixel " P1 ", " P2 ", " P3 " and " P6 " and observe in district's " VZ2 " (shown in Figure 3).Therefore, the user in the second observation district " VZ2 " can be observed the image from the first, second, third and the 6th image sub-pixel " P1 ", " P2 ", " P3 " and " P6 ".Like this, when the picture signal that will produce required image is applied to the first, second, third and the 6th image sub-pixel " P1 ", " P2 ", " P3 " and " P6 ", can be observed required image second user who observes in district's " VZ2 " (shown in Figure 3).Yet, when the picture signal that is applied to the first and second image sub-pixels " P1 " and " P2 " and will produces non-required image when the picture signal that will produce required image was applied to the 3rd and the 6th image sub-pixel " P3 " and " P6 ", the user who distinguishes in " VZ2 " (shown in Figure 3) in second observation can not observe required image.Can forge required image and produce non-required image, and this non-required image can be sensing less than image.In other words, can the picture signal that be applied to the 3rd and the 6th image sub-pixel " P3 " and " P6 " by control be determined observe required image second user who observes in district's " VZ2 " (shown in Figure 3).
As mentioned above, the image display device 110 according to embodiment of the present invention uses barrier 130 (shown in Fig. 4 B) as observing district's generation unit and controlling the picture signal that is applied to display panel 120 (shown in Fig. 4 A).This image display device 110 has the convertibility between wide and narrow viewing angle modes.In addition, owing in the first and second observation districts " VZ1 " and " VZ2 " (shown in Figure 3), show from the wherein image of four image sub-pixels in first to the 6th image sub-pixel " P1 " to " P6 ", so do not have the problem of brightness and resolution degradation.
Fig. 6 is the synoptic diagram that is applied to according to the picture carrier of the image display device of embodiment of the present invention.With reference to Fig. 5 B and Fig. 6, regardless of field-of-view mode, with required image be applied to first, second, the 4th and the 5th image sub-pixel " P1 ", " P2 ", " P4 " and " P5 ".Yet the image that is applied to the 3rd and the 6th image sub-pixel " P3 " and " P6 " depends on field-of-view mode.For example, when image display device works in wide field-of-view mode, required image is applied to the 3rd and the 6th image sub-pixel " P3 " and " P6 ".When image display device works in narrow field-of-view mode, non-required image is applied to the 3rd and the 6th image sub-pixel " P3 " and " P6 ".
As mentioned above, obtain non-required image by forging required image.For example, forge the first picture signal " S P1" to produce the 3rd picture signal " S P3".With the first and the 3rd picture signal " S P1" and " S P3" be applied to the first and the 3rd image sub-pixel " P1 " and " P3 " respectively.Forge the second picture signal " S P2" to produce the 6th picture signal " S P6".With the second and the 6th picture signal " S P2" and " S P6" be applied to the second and the 6th image sub-pixel " P2 " and " P6 " respectively.Forge the first picture signal " S P1", make the picture signal " S that wins P1" brightness and the 3rd picture signal " S P3" half of high-high brightness " Lmax " of summation and each image pixel of brightness equate.Similarly, forge the second picture signal " S P2", make the second picture signal " S P2" brightness and the 6th picture signal " S P6" half of high-high brightness " Lmax " of summation and each image pixel of brightness equate.
Shown in Fig. 5 B, the 3rd visual sub-pixel " P3 " during the first image sub-pixel " P1 " in (3N-2) row is gone with (3N-1) is adjacent.Equally, the 6th visual sub-pixel " P6 " during the second image sub-pixel " P2 " in (3N-2) row is gone with (3N) is adjacent.As a result, when the user in the second observation district " VZ2 " observed image display device, each pixel cell " UP " has identical brightness and the user does not observe required image in the second observation district " VZ2 ".Thereby image display device works in narrow field-of-view mode.
Although not shown, each image sub-pixel can have a plurality of sub-color image pixel that produces different colours.Similar to above-mentioned forgery, forge picture signal and it is applied to a plurality of sub-color image pixels.
Fig. 7 is the floor map according to the situation of the image display device display image of embodiment of the present invention.As shown in Figure 7, the image display device 110 according to embodiment of the present invention comprises display panel 120 and barrier 130.Image display device 110 forms first and second and observes district " VZ1 " and " VZ2 ".When image display device 110 works in wide field-of-view mode, by the picture signal identical with " P5 " with the 4th and the 5th image sub-pixel " P4 " is applied to the 3rd and the 6th image sub-pixel " P3 " and " P6 ", the user observes the required image of observing in the district " VZ1 " and " VZ2 " from four image sub-pixels in first to the 6th image sub-pixel " P1 " to " P6 " of display panel 120 first and second.The user first observe observe in the district " VZ1 " from first, second, the required image of the 4th and the 5th image sub-pixel " P1 ", " P2 ", " P4 " and " P5 ", and the user observes second and distinguishes the required image of observing in " VZ2 " from the first, second, third and the 6th image sub-pixel " P1 ", " P2 ", " P3 " and " P6 ".
In addition, when image display device 110 works in narrow field-of-view mode, will be respectively from the first and second picture signal " S P1" and " S P2" the 3rd and the 6th picture signal " S that forges P3" and " S P6" be applied to the 3rd and the 6th image sub-pixel " P3 " and " P6 ".As a result, the user first observe can observe in the district " VZ1 " from first, second, the required image of the 4th and the 5th image sub-pixel " P1 ", " P2 ", " P4 " and " P5 ".Yet the user observes in the district " VZ2 " second can not observe required image.In other words, when the image display panel 110 according to embodiment of the present invention worked in narrow field-of-view mode, the user only observes in the district " VZ1 " first just can observe required image.
As mentioned above, the stop portions 134 (as shown in Figure 3) of barrier 130 stops the image from display panel 120.Yet in another illustrative embodiments, image can not pass through stop portions 134 by stop portions 134 (as shown in Figure 3) in narrow field-of-view mode in wide field-of-view mode.
Fig. 8 is the schematic cross-section according to the barrier of the image display device of embodiment of the present invention.As shown in Figure 8, barrier 130 comprises first substrate 140, second substrate 150 and liquid crystal layer 160.First and second substrates 140 and 150 toward each other, and liquid crystal layer 160 is clipped in the middle of the two.On the outside surface of first and second substrates 140 and 150, form first and second polaroids 142 and 152 respectively.In addition, on the inside surface of first and second substrates 140 and 150, form first and second electrodes 144 and 154 respectively.On the whole surface of first substrate 140, form first electrode 144.And then second electrode 154 comprises transmission part 132 and stop portions 134.Voltage is applied to first and second electrodes 144 and 154, thus between first and second electrodes 144 and 154 induction field.Liquid crystal layer 160 has different transmissivities according to electric field.For example, when identical voltage was applied to first and second electrodes 144 and 154, liquid crystal layer 160 had a certain transmissivity.And when different voltage was applied to first and second electrodes 144 and 154 respectively, liquid crystal layer 160 did not have transmissivity.First and second electrodes 144 and 154 are made with transmission light by transparent, conductive material.
When the image display device 110 that comprises above-mentioned barrier 130 works in wide field-of-view mode, stop portions 134 images signals, thereby the user can not only observe can also observe in the district " VZ2 " second in the district " VZ1 " and observe required image first, can from first to the 6th image sub-pixel " P1 " and " P6 " observation required image.The 3rd can receive and the 4th and the 5th image sub-pixel " P4 " picture signal identical with " P5 " with " P6 " with the 6th image sub-pixel " P3 ", and to first to the 6th image sub-pixel " P1 " and " P6 " perhaps distributes picture signal.As a result, when image display device 110 works in wide field-of-view mode, there is not the problem of brightness and resolution degradation.
Fig. 9 A is respectively at the different barrier of the image display device in the district and the planimetric maps of sub-pixel observed with 9B.
Shown in Fig. 9 A and 9B, in the display panel 220 of image display device 210, arrange a plurality of pixel cells " UP " with matrix shape.Each pixel cell " UP " comprises that first to the 6th image sub-pixel " P1 " arrives " P6 ".First to the 6th image sub-pixel " P1 " arrives " P6 " and arranges with matrix shape.Barrier 230 comprises a plurality of transmission parts 232 and a plurality of stop portions 234.A plurality of transmission parts 232 and a plurality of stop portions 234 are alternately arranged in the row at (3N-1) with (3N).Yet, in (3N-2) row, be provided with a plurality of transmission parts 232 and do not have stop portions 234.In other words, in first row " 1R ", the user first and second observe district " VZ1 " (Fig. 3) and " VZ2 " observe identical image in (Fig. 3) from first and second sub-pixels " P1 " and " P2 ".On the other hand, second and the third line " 2R " and " 3R " in, a plurality of transmission parts 232 and a plurality of stop portions 234 alternately arranged.Because third and fourth sub-pixel " P3 " and " P4 " be corresponding to second row " 2R ", the user observes district " VZ1 " first and second (Fig. 3) can observe image from one of third and fourth sub-pixel " P3 " and " P4 " in (Fig. 3) with " VZ2 ".And, because the 5th and the 6th sub-pixel " P5 " and " P6 " be corresponding to the third line " 3R ", the user observes district " VZ1 " first and second (Fig. 3) can observe image from one of the 5th and the 6th sub-pixel " P5 " and " P6 " in (Fig. 3) with " VZ2 ".
In this case, stop portions 234 comprises a plurality of unit stop portions 234u.These a plurality of unit stop portions 234u overlap each other and repeated arrangement.Each unit stop portions 234u has than each sub-pixel " P1 " and arrives " P6 " big area.If each unit stop portions 234u has and arrives " P6 " area identical with each sub-pixel " P1 " or than its big area, then observe the district and becoming discontinuous, thus the user first and second observe district " VZ1 " (Fig. 3) and " VZ2 " observe not desired images in (Fig. 3).Disturb owing in adjacent subpixels, exist, can produce such as the problem of crosstalking.
Yet, owing to have the area that arrives " P6 " greater than each sub-pixel " P1 " according to each unit stop portions 234u of image display device of the present invention, the problems referred to above can not appear.When transmission part 232 comprised a plurality of unit transmission part 232u, each unit transmission part 232u had than each sub-pixel " P1 " and " P6 " little area.
In other words, because there are the problem of the barrier properties reduction at side-looking angle in Fig. 9 A and the image display device with barrier 230 and display panel 220 shown in the 9B from first image of first and second sub-pixels " P1 " and " P2 " and the different useful area that arrive " P6 " from the 3rd to the 6th sub-pixel " P3 ".Be used for first and second observe district " VZ1 " (Fig. 3) and " VZ2 " (Fig. 3) observe whole first images from first and second sub-pixels " P1 " and " P2 ".Yet, the user first and second observe district " VZ1 " (Fig. 3) and " VZ2 " observe part second image in (Fig. 3) from the 3rd and the 6th sub-pixel " P3 " and " P6 " and the 4th and the 5th sub-pixel " P4 " and " P5 ".
Turn back to Fig. 9 A and 9B, first width " B1 " of first image is greater than second width " B2 " of second image.Therefore, the user (Fig. 3) observes recently from big first image from first and second sub-pixels " P1 " and " P2 " of second image of the 4th and the 5th sub-pixel " P4 " and " P5 " in the first observation district " VZ1 ".Similarly, the user (Fig. 3) observes recently from big first image from first and second sub-pixels " P1 " and " P2 " of second image of the 3rd and the 6th sub-pixel " P3 " and " P6 " in the second observation district " VZ2 ".
As a result, each sub-pixel " P1 " has different brightness to " P6 ".Specifically, in narrow field-of-view mode, since second observe district " VZ2 " (Fig. 3) in, have recently the big brightness of second image from the 3rd and the 6th sub-pixel " P3 " and " P6 " from first image of first and second sub-pixels " P1 " and " P2 ", the user observes district " VZ2 " second can observe first image in (Fig. 3).In fact, first image should not be in second and observes district " VZ2 " and be shown to the user in (Fig. 3) in narrow field-of-view mode.From the brightness of second image of the 3rd and the 6th sub-pixel " P3 " and " P6 " and the 4th and the 5th sub-pixel " P4 " and " P5 " is from 60% to 90% of the brightness of first image of first and second sub-pixels " P1 " and " P2 ".
In order to address these problems, use different gamma signal curves according to image display device of the present invention, thereby as shown in figure 10, each sub-pixel produces different brightness in identical gray level.
Figure 10 is the gamma signature tune line chart that is used for according to each pixel of image display device of the present invention.With brightness normalization, thereby this normalized brightness has maximal value 1.As shown in figure 10, image display device uses at least two gamma signal curves, i.e. first and second gamma signal curve " G1 " and " G2 ".The first gamma signal curve " G1 " is used for first and second sub-pixels " P1 " and " P2 ", arrives " P6 " and the second gamma signal curve " G2 " is used for the 3rd to the 6th sub-pixel " P3 ".
When identical gray level being applied to first to the 6th sub-pixel " P1 " and arriving " P6 ", have greater than normalization brightness from first image of first and second sub-pixels " P1 " and " P2 " from second image of the 4th and the 5th sub-pixel " P4 " and " P5 " and the 3rd and the 6th sub-pixel " P3 " and " P6 ".Specifically, the difference between first and second images compensates by said process, thereby has improved the problem of barrier properties in the above-mentioned side-looking angle.
For example, under identical gray level, the normalization brightness of the second gamma signal curve " G2 " is C1/C2 times of the first gamma signal curve " G1 ", up to critical gray level " GLc ".When gray level was divided into first and second parts, critical gray level " GLc " can be between first and second parts.First image in symbol " C1 " expression first and second sub-pixels " P1 " and " P2 " aspect brightness to the contribution of total image.Second image among symbol " C2 " expression the 3rd and the 6th sub-pixel " P3 " and " P6 " aspect brightness to the contribution of total image.The value of " C1 " and " C2 " can be proportional with the useful area of first and second sub-pixels " P1 " and " P2 " and the 3rd and the 6th sub-pixel " P3 " and " P6 ".
Because contribution " C2 " has low value in first, the 3rd and the 6th sub-pixel " P3 " and " P6 " use the second gamma signal curve " G2 " to produce image.In other words, because contribution " C1 " has high value in first, first and second sub-pixels " P1 " and " P2 " use the first gamma signal curve " G1 " to produce image.The result, the the 3rd and the 6th sub-pixel " P3 " and " P6 " have than first and second sub-pixels " P1 " and " P2 " big normalization brightness, thereby the significant surface product moment between first and second sub-pixels " P1 " and " P2 " and the 3rd and the 6th sub-pixel " P3 " and " P6 " is compensated.
In other words, in second portion, first and second sub-pixels use the first gamma signal curve " G1 " to produce image.The the 4th and the 5th sub-pixel " P4 " and " P5 " and the 3rd and the 6th sub-pixel " P3 " and " P6 " use the second gamma signal curve " G2 " to produce image.In second portion, gray level has the value bigger than critical gray level GLc.Can use obvious area between the sub-pixel and luminance difference determine critical gray level " GLc " and with this corresponding normalization brightness of critical gray level " GLc " " L1 ".
In Figure 10, the luminance difference between the first and second gamma signal curves " G1 " and " G2 " at second portion less than first.Yet because the brightness of the second gamma signal curve " G2 " is greater than the brightness of the first gamma signal curve " G1 ", the significant surface product moment between first and second sub-pixels " P1 " and " P2 " and the 3rd and the 6th sub-pixel " P3 " and " P6 " is compensated.
As a result, in narrow field-of-view mode, improved the angle limitations effect.
Flat-panel display device (FPD device), such as liquid crystal display device (LCD device), field emission display (FED device), Plasmia indicating panel (PDP), electro-luminescence display device or the like, can be with the display panel that acts on according to the image display device of embodiment of the present invention.When the transmission-type LCD device that comprises backlight assembly and liquid crystal panel was used for display panel, barrier can be in one of them of two kinds of situations between liquid crystal panel and the user and between backlight assembly and the liquid crystal panel.
Therefore, comprise at the observation district generation unit between the display panel of this image display device and the user so that different observation districts to be provided according to the image display device of embodiment of the present invention.In addition, different image pixels is display image in different observation districts, and the user receives different images in different observation districts.
Clearly, those of ordinary skill in the art can carry out various modifications and variations to the image display and the driving method thereof of embodiment of the present invention under the situation that does not break away from spirit of the present invention or scope.Thereby embodiments of the present invention are intended to cover the various modifications and variations of the present invention that provided by appended claims and equivalent thereof.

Claims (21)

1, a kind of image display device comprises:
Display panel, described display panel comprise a plurality of image pixels unit, and each the image pixel unit in described a plurality of image pixels unit has first to the 6th sub-pixel of the matrix shape that is arranged as two row triplex rows; And
The barrier that on described display panel, comprises a plurality of transmission parts and a plurality of stop portions,
Wherein said a plurality of transmission parts and described a plurality of stop portions are arranged in matrix shape,
Wherein (3N) row and (3N-1) row comprise described a plurality of transmission parts and described a plurality of stop portions, N is a positive integer, (3N-2) row comprises described a plurality of transmission parts of getting rid of described a plurality of stop portions, described transmission part and stop portions are arranged alternately in described (3N-1) row and described (3N) row, and the transmission part in described (3N) row is aimed at the stop portions in described (3N-1) row, and
Wherein each described stop portions has the area bigger than each sub-pixel.
2, device according to claim 1, it is characterized in that, described first and second sub-pixels are corresponding to first row of its image pixel unit, place, described third and fourth sub-pixel is corresponding to second row of its image pixel unit, place, and the described the 5th and the 6th sub-pixel is corresponding to the third line of its image pixel unit, place.
3, device according to claim 2, it is characterized in that, described barrier provides the first and second observation districts with different visual angles, wherein said first, second, the 4th and the 5th sub-pixel observes described first and shows first image in the district, and the described first, second, third and the 6th sub-pixel is observed described second and is shown second image in the district.
4, device according to claim 3 is characterized in that, described first observes the middle section of district corresponding to described display panel, and described second observes the district corresponding to described first two side areas of observing the district.
5, device according to claim 4 is characterized in that, is applied to the described the 3rd identical with the picture signal that is applied to the 4th and the 5th sub-pixel with the picture signal of the 6th sub-pixel.
6, device according to claim 4, it is characterized in that the brightness of first summation of the brightness of the picture signal in the brightness of the picture signal in described first sub-pixel and described the 3rd sub-pixel that is being adjacent to described first sub-pixel and the picture signal in described second sub-pixel and to be adjacent to second summation of brightness of the picture signal in described the 6th sub-pixel of described second sub-pixel identical.
7, device according to claim 6 is characterized in that, described first and second summations are essentially half of high-high brightness in each sub-pixel.
8, device according to claim 1, it is characterized in that, described barrier comprises first and second substrates, first and second polaroids, first and second electrodes and liquid crystal layer, wherein first and second substrates face with each other, first and second polaroids are separately positioned on the outside surface of first and second substrates, first and second electrodes are separately positioned on the inside surface of first and second substrates, liquid crystal layer inserts between this first and second substrate, and second electrode is corresponding to one of transmission part and stop portions.
9, device according to claim 1, it is characterized in that, described display panel comprises liquid crystal panel and is positioned at the backlight assembly of this liquid crystal panel rear side, and described barrier is arranged on the front side of described liquid crystal panel or is arranged between described liquid crystal panel and the backlight assembly.
10. image display device comprises:
Display panel, described display panel comprise a plurality of image pixels unit, and each the image pixel unit in described a plurality of image pixels unit has first to the 6th sub-pixel of the matrix shape that is arranged as two row triplex rows; With
Barrier, it comprises first row, second row and the third line, the basic transmission of this first behavior, second row has a plurality of first transmission parts and a plurality of first stop portions, and the third line has a plurality of second transmission parts and a plurality of second stop portions,
Wherein first transmission part and first stop portions are partly aimed at second stop portions and second transmission respectively,
Wherein said first transmission part and first stop portions are alternately arranged along second row, and described second transmission part and second stop portions are alternately arranged along the third line, and
Wherein each described stop portions has the area bigger than each sub-pixel.
11. device according to claim 10 is characterized in that, described barrier comprises first and second substrates, first and second polaroids, first and second electrodes and liquid crystal layer.
12. device according to claim 10, it is characterized in that, described first and second sub-pixels are corresponding to first row of its image pixel unit, place, third and fourth sub-pixel is corresponding to second row of its image pixel unit, place, and the 5th and the 6th sub-pixel is corresponding to the third line of its image pixel unit, place.
13. device according to claim 10, it is characterized in that, described barrier provides the first and second observation districts with different visual angles, first, second, the 4th and the 5th sub-pixel observes first and shows first image in the district, and the first, second, third and the 6th sub-pixel is observed second and is shown second image in the district.
14. device according to claim 13 is characterized in that, described first observes the middle section of district corresponding to display panel, and the second observation district is corresponding to first two side areas of observing the district.
15. a method that drives image display device according to claim 2, this method comprises:
When working in narrow field-of-view mode, respectively first to the 6th picture signal is applied to first to the 6th sub-pixel, the described the 3rd and the 6th picture signal is different from the described the 4th and the 5th picture signal; And
When working in wide field-of-view mode, the described the 3rd and the 6th picture signal that will be identical with the described the 4th and the 5th picture signal is applied to the described the 3rd and the 6th sub-pixel.
16, method according to claim 15, it is characterized in that, the described step that applies first to the 6th picture signal comprises forges described first and second picture signals producing the described the 3rd and the step of the 6th picture signal respectively, and wherein located adjacent one another described first is identical with second summation of the brightness of described second and the 6th sub-pixel located adjacent one another with first summation of the brightness of the 3rd sub-pixel.
17, method according to claim 16 is characterized in that, described first and second summations be in each sub-pixel brightness peaked half.
18. method according to claim 15 is characterized in that, in same grey level, described first and second sub-pixels have first brightness, and the described the 3rd and the 6th sub-pixel has second brightness, and wherein said second brightness is greater than first brightness.
19. method according to claim 18 is characterized in that, also comprises:
Use the first gamma signal curve to determine the brightness of first and second picture signals; And
Use the second gamma signal curve to determine the brightness of the 3rd and the 6th picture signal.
20. method according to claim 19, it is characterized in that, under identical gray level, the brightness that the described second gamma signal curve has is C1/C2 times of the first gamma signal curve, wherein C1 is the contributions of each first and second sub-pixel to total brightness, and C2 is the contribution of each the 3rd and the 6th sub-pixel to total brightness.
21. method according to claim 20, it is characterized in that, described C1/C2 and A1/A2 are proportional, and wherein A1 is the barrier visual areas of each first and second sub-pixel by the liquid crystal panel top, and A2 is the barrier visual area of each the 3rd and the 6th sub-pixel by the liquid crystal panel top.
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