CN107942575B - Display system of multilayer TN-LCD - Google Patents

Display system of multilayer TN-LCD Download PDF

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Publication number
CN107942575B
CN107942575B CN201711174028.7A CN201711174028A CN107942575B CN 107942575 B CN107942575 B CN 107942575B CN 201711174028 A CN201711174028 A CN 201711174028A CN 107942575 B CN107942575 B CN 107942575B
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display system
lcd
gray scale
luminance
liquid crystal
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CN201711174028.7A
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CN107942575A (en
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樊子健
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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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers
    • 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
    • G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
    • G02F1/133565—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements inside the LC elements, i.e. between the cell substrates

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The invention relates to a display system of a multilayer TN-LCD, comprising: the liquid crystal display panel comprises a backlight source, a plurality of layers of TN-LCDs, polarizing films and 1/2 wavelength plates, wherein the backlight source is positioned at the inner side of the display system, the plurality of layers of TN-LCDs are sequentially laminated from the inner side to the outer side of the display system, the polarizing films are arranged on the surfaces, close to the backlight source, of the innermost layer of TN-LCD, the polarizing films are also arranged on the surfaces, far away from the backlight source, of the outermost layer of TN-LCD, and the 1/2 wavelength plates are positioned between the innermost TN-LCD and the outermost TN-LCD. In the process of improving the gray scale, the luminance of the display system is firstly reduced along with the improvement of the gray scale and then increased along with the improvement of the gray scale, so that the chromaticity is changed in a specific range, and the display quality is ensured.

Description

Display system of multilayer TN-LCD
Technical Field
The invention relates to the field of liquid crystal display, in particular to a display system of a multilayer TN-LCD.
Background
Liquid Crystal Displays (LCD) have become one of the essential devices in people's daily life. Currently, the multi-layer LCD has been applied to a security display system, and the security display system generally employs a multi-layer Twisted Nematic liquid crystal display (TN-LCD).
Referring to fig. 1, in the prior art, a security display system includes: the backlight source BL (Back light), the multilayer twisted nematic liquid crystal display TN-LCD and the polarizing film PF (polarization film), the multilayer twisted nematic liquid crystal display TN-LCD is arranged in a lamination mode, the backlight source BL is arranged on one side of the multilayer twisted nematic liquid crystal display TN-LCD, two polarizing films PF are respectively arranged on two surfaces of each layer of twisted nematic liquid crystal display TN-LCD, and the polarization directions of the polarizing films PF on the two surfaces are vertical.
The operation principle of the single-layer twisted nematic liquid crystal display TN-LCD is as follows: the backlight source BL emits light, and after the light passes through a polarizing film PF of a first twisted nematic liquid crystal display TN-LCD, polarized light which is transmitted along a specific direction is formed; before the liquid crystal molecules in the twisted nematic liquid crystal display TN-LCD are twisted, light cannot penetrate through the other polarizing film PF; when display is required, a part of liquid crystal molecules in the twisted nematic liquid crystal display TN-LCD is controlled to be twisted by 90 ° so that the transmission direction of light of the part is changed by 90 ° to be the same as the polarization direction of the other polarizing film PF, thereby penetrating the other polarizing film PF.
The working principle of the safety display system is as follows: the picture to be displayed is divided into a plurality of layers, each layer being displayed by one twisted nematic liquid crystal display TN-LCD, the display angles of all twisted nematic liquid crystal displays TN-LCD having an overlap, the angle range of which is the final viewing angle range, typically 90 ° to 120 °. When the screen of the display system is viewed at the position with the visual angle range, only part of the picture displayed by the twisted nematic liquid crystal display TN-LCD can be seen, namely, the whole picture cannot be viewed by other people, thereby achieving the effect of safe display.
However, after the display system is stacked by the multi-layer TN-LCD, the overall luminance of the display system can only be increased but not decreased with the increase of the gray scale, and the continuous increase of the luminance can affect the chromaticity variation and reduce the quality of the display system.
Disclosure of Invention
The present invention is directed to solving the above problems, and provides a display system of a multi-layer TN-LCD, the display system comprising: the display system comprises a backlight source, a plurality of layers of TN-LCDs, polarizing films and 1/2 wavelength plates, wherein the backlight source is located on the inner side of the display system, the plurality of layers of TN-LCDs are sequentially stacked from the inner side to the outer side of the display system, the polarizing films are arranged on the surfaces, close to the backlight source, of the innermost layer of TN-LCD, the polarizing films are also arranged on the surfaces, far away from the backlight source, of the outermost layer of TN-LCD, and the 1/2 wavelength plates are located between the innermost TN-LCD and the outermost TN-LCD.
Specifically, the polarizing film is not provided between the innermost TN-LCD and the outermost TN-LCD.
Specifically, the TN-LCD is two-layer.
The invention has the beneficial effects that: in the process of improving the gray scale of the display system, the luminance is firstly reduced along with the improvement of the gray scale and then increased along with the improvement of the gray scale, so that the chromaticity is changed in a specific range, and the display quality is ensured.
Drawings
FIG. 1 is a schematic diagram of a prior art display system;
FIG. 2 is a schematic diagram of a display system according to the present invention;
FIG. 3 is a schematic view of a detection device according to the present invention;
FIG. 4a is a schematic diagram of gray-level-luminance variation of the first group of display systems;
FIG. 4b is a schematic diagram showing gray-level-luminance variation of the second group of display systems;
FIG. 4c is a schematic diagram showing gray-level-luminance variation of the third group of display systems;
FIG. 5 is a graph comparing the luminance variation of the display system according to the present invention with that of the conventional display system;
FIG. 6 is a schematic diagram of a set of gray-to-chrominance variations for a display system according to the present invention;
FIG. 7a is a schematic diagram illustrating the gray-level variation of the display system when the initial luminance value is 4.5;
FIG. 7b is a schematic diagram showing the gray-level-to-chrominance variation of the display system when the initial value of the luminance is 6;
fig. 7c is a schematic diagram of the gray-level-chrominance variation of the display system when the initial value of the luminance is 8.
Detailed Description
The invention will be further elucidated with reference to the drawings in which:
as shown in fig. 2, the display system of the present invention includes: backlight 1, multilayer twisted nematic liquid crystal display 2 (i.e., TN-LCD), polarizing film 3, and 1/2 wavelength plate 4. The backlight 1 is positioned inside the display system, the multilayer twisted nematic liquid crystal displays 2 are sequentially laminated from the inside to the outside of the display system, the polarizing film 3 is arranged on the surface of the innermost layer of twisted nematic liquid crystal display 2 close to the backlight 1, the polarizing film 3 is arranged on the surface of the outermost layer of twisted nematic liquid crystal display 2 far away from the backlight 1, and the 1/2 wavelength plate 4 is positioned between the innermost layer of twisted nematic liquid crystal display 2 and the outermost layer of twisted nematic liquid crystal display 2. In the present embodiment, the twisted nematic liquid crystal display 2 has two layers, i.e. the frame of the display system is divided into two layers. As a preferable mode, there is no polarizing film between the innermost twisted nematic liquid crystal display 2 and the outermost twisted nematic liquid crystal display 2, so that the overall thickness of the display system can be reduced and the influence of the unnecessary polarizing film can be eliminated. In this embodiment, the twisted nematic liquid crystal display 2 has two layers, and the thickness of the display system can be further reduced by implementing the security display function by the two layers of twisted nematic liquid crystal display 2.
The present invention tests the luminance of the display system by a test apparatus as shown in fig. 3, the test apparatus comprising: a support 101, a mirror 102, and a luminance detector 103. The display system is placed on the support table 101, and an included angle of 90 degrees is formed between the emitting direction of the display system and the detection direction of the luminance detector 103. The reflecting mirror 102 forms an angle of 45 ° with the emitting direction of the display system and the detecting direction of the luminance detecting instrument 103, respectively.
As shown in fig. 4a, the initial value of the luminance of the display system is 4.5cd, and when the gray scale of the outermost twisted nematic liquid crystal display 2 starts to increase (normally, the gray scale range is 0 to 255), the luminance value of the display system decreases, and when the gray scale reaches 110, the luminance value of the display system starts to increase, and when the gray scale reaches 190, the luminance value of the display system returns to 4.5cd again, and continues to increase as the gray scale increases.
As shown in fig. 4b, the initial value of the luminance of the display system is 6cd, and when the gray scale of the outermost twisted nematic liquid crystal display 2 starts to increase, the luminance value of the display system decreases, and when the gray scale reaches 130, the luminance value of the display system starts to increase, and when the gray scale reaches 220, the luminance value of the display system returns to 6cd again, and continues to increase as the gray scale increases.
As shown in fig. 4c, the initial value of the luminance of the display system is 8cd, and when the gray scale of the outermost twisted nematic liquid crystal display 2 starts to increase, the luminance value of the display system decreases, and when the gray scale reaches 140, the luminance value of the display system starts to increase, and when the gray scale reaches 255, the luminance value of the display system returns to 8cd again.
As shown in fig. 5, the I-axis represents the luminance value, the line R1 represents the luminance change of the innermost twisted nematic liquid crystal display of the related art, the line R2 represents the luminance change of the innermost twisted nematic liquid crystal display of the present invention, and the line F represents the luminance change of the outermost twisted nematic liquid crystal display of the present invention. In combination with the above detection results, since the 1/2 wavelength plate is provided in the display system of the present invention, and the luminance variation curve of the innermost twisted nematic liquid crystal display is inverted from the first phenomenon to the second phenomenon, so that the luminances of the innermost and outermost twisted nematic liquid crystal displays are superimposed in a subtraction manner, compared with the prior art, the luminance value of the display system of the present invention does not increase from the initial stage with the increase of the gray scale, but undergoes a process of decreasing with the increase of the gray scale and then increasing with the increase of the gray scale, and when the luminance value increases to be equal to the initial value of the luminance, the luminance value continues to be in an increasing state.
The chromaticity of the display system was tested, and as shown in fig. 6, in the chromaticity test, the gray scale was raised from 0 to 255, where the left arrow indicates the process of raising the gray scale from 0 to the gray scale at which the display system luminance was at the minimum, and the right arrow indicates the process of raising the gray scale from the gray scale at which the display system luminance was at the minimum to 255.
When the luminance decreases from the initial value to the minimum value, the chromaticity changes from a region (0.21,0.19) of low color temperature to a region (0.31,0.36) of high color temperature; when the luminance increases from the minimum value to the maximum value, the chromaticity changes again from the region of high color temperature (0.31,0.36) to the region of low color temperature (0.21, 0.19).
As shown in fig. 7a, 7b and 7c, the initial values of luminance are 4.5, 6.0 and 8.0, respectively, and when the gray scale is raised to 110, 130 and 140, respectively, the chromaticities thereof are changed to regions of high color temperature (0.31,0.36), (0.29,0.35) and (0.28,0.34), respectively; when the gray scale levels are raised to 190, 220 and 255, respectively, the chromaticities thereof are changed again to the regions of low color temperatures (0.21,0.19), (0.20 ) and (0.21,0.19), respectively. It can be seen that the trend of the chromaticity variation is independent of the initial value of the luminance of the display system.
It can be seen from the above test results that, in the process of increasing the gray scale, the luminance of the display system of the present invention decreases with the increase of the gray scale, and then increases with the increase of the gray scale, so that the chromaticity changes in a specific range, and the display quality is ensured.
The above-described embodiments are merely preferred examples of the present invention, and not intended to limit the scope of the invention, so that equivalent changes or modifications in the structure, features and principles of the invention described in the claims should be included in the claims.

Claims (2)

1. A display system of a multi-layer TN-LCD, the display system comprising: the display system comprises a backlight source, a plurality of layers of TN-LCDs, polarizing films and 1/2 wavelength plates, wherein the backlight source is located on the inner side of the display system, the plurality of layers of TN-LCDs are sequentially stacked from the inner side to the outer side of the display system, the polarizing films are arranged on the surfaces, close to the backlight source, of the innermost layer of TN-LCD, the polarizing films are also arranged on the surfaces, far away from the backlight source, of the outermost layer of TN-LCD, the 1/2 wavelength plates are located between the innermost layer of TN-LCD and the outermost layer of TN-LCD, and the polarizing films are not arranged between the innermost layer of TN-LCD and the outermost layer of TN-LCD.
2. The display system of claim 1, wherein the TN-LCD is two-layered.
CN201711174028.7A 2017-11-22 2017-11-22 Display system of multilayer TN-LCD Active CN107942575B (en)

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CN110646982B (en) 2019-10-08 2021-08-10 京东方科技集团股份有限公司 Liquid crystal display panel, driving method thereof and display device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1873502A (en) * 2005-05-30 2006-12-06 斯坦雷电气株式会社 Liquid crystal display device
CN101470306A (en) * 2007-12-29 2009-07-01 胜华科技股份有限公司 Double-layer ultra-torsion nematic liquid crystal display panel and its aberration compensation method
CN201859284U (en) * 2010-10-28 2011-06-08 精电(河源)显示技术有限公司 Double-layer liquid crystal display panel
CN202815382U (en) * 2012-06-01 2013-03-20 信利半导体有限公司 DTSN (Double Super Twisted Nematic) module and liquid crystal compensation box thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103105709A (en) * 2013-01-30 2013-05-15 江苏亿成光电科技有限公司 Multi-content super-wide temperature liquid crystal display

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1873502A (en) * 2005-05-30 2006-12-06 斯坦雷电气株式会社 Liquid crystal display device
CN101470306A (en) * 2007-12-29 2009-07-01 胜华科技股份有限公司 Double-layer ultra-torsion nematic liquid crystal display panel and its aberration compensation method
CN201859284U (en) * 2010-10-28 2011-06-08 精电(河源)显示技术有限公司 Double-layer liquid crystal display panel
CN202815382U (en) * 2012-06-01 2013-03-20 信利半导体有限公司 DTSN (Double Super Twisted Nematic) module and liquid crystal compensation box thereof

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