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Display apparatus

A display device and display panel technology, applied in the direction of static indicators, light guides, optics, etc., can solve the problems that the structure cannot be connected to the light source locally, the response speed is low, the on/off control cannot be performed, and the brightness can be suppressed reduction, suppression of brightness reduction, and light reduction effects

Inactive Publication Date: 2010-01-27
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, this method cannot be used when the light source is a cold-cathode tube or an edge-lit type light source using a light guide plate
In the former case, on / off control cannot be performed in a direction parallel to the extending direction of the cold cathode tube, and the response speed is lower than that of an LED having the light emitting speed of a general phosphor
In the latter case, the light source cannot be switched on locally due to structural problems

Method used

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no. 1 approach

[0038] figure 1 An example of the general structure of the display device 1 as the first embodiment of the present invention is shown. The display device 1 has a liquid crystal display panel 10 (display panel), a polarizing plate 20A (first polarizing plate) and a polarizing plate 20B (second polarizing plate) sandwiching the liquid crystal display panel 10 , a The lighting device 30 and the driving circuit 40 for driving the liquid crystal display panel 10 to display video images. The surface of the polarizing plate 20A faces a viewer (not shown).

[0039] The liquid crystal display panel 10 is configured to display video images. For example, the liquid crystal display panel 10 is a transmissive display panel in which pixels are driven according to video signals, and has a structure in which a liquid crystal layer is sandwiched between a pair of transparent substrates. Specifically, such as figure 2 As shown, the liquid crystal display panel 10 has a transparent substrat...

no. 2 approach

[0085] Figure 9 An example of the schematic structure of the display device 2 of the second embodiment of the present invention is shown. The structure of the display device 2 is different from the display device 1 of the previous embodiment in that an illumination device 60 having a polarization control element 61 is provided instead of the polarization control element 36 of the previous embodiment. Hereinafter, points different from the previous embodiment will be mainly described, and descriptions on points common to the previous embodiment will not be repeated.

[0086] Like the polarization control element 36 in the previous embodiment, the polarization control element 61 is provided in order to suppress the brightness of black in a black display portion included in a video image. For example, the polarization control element 61 is a transmissive panel that drives pixels according to a control signal, and has a structure in which a liquid crystal layer is sandwiched bet...

Embodiment

[0110] First and second embodiments of the present invention will be described in comparison with first and second comparative examples. The display device of the first embodiment corresponds to a specific example of the display device 1 of the first embodiment. In the 40-inch LCD TV "BRAVIA 2005" (BRAVIA is a registered trademark of Sony Corporation) manufactured by Sony Corporation, a 5-inch TN-type LCD panel is installed in the center of the screen between the LCD panel and the reflective polarizer as a polarization control element. In the first embodiment, the transmission axis of the reflective polarizer, the transmission axis of the polarization control element (TN type liquid crystal panel) when no control signal is applied, and the transmission axis of the polarizer on the rear side of the liquid crystal display panel are set parallel to each other . The display device of the second embodiment corresponds to a specific example of the display device 2 of the second em...

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Abstract

The present application provides a display apparatus including: a display panel having a plurality of pixels disposed in a matrix; a first polarizer; a second polarizer; a surface emitting light source; a third polarizer; and a polarization control element whose orientation of a transmission axis changes according to a control signal. A control section outputs a control signal that controls orientation of the transmission axis of the polarization control element so that a polarization axis of transmission light of the polarization control element is oriented in a direction crossing the transmission axis of the first polarizer in a part corresponding to a pixel position of black display and is oriented in a direction parallel to the transmission axis of the first polarizer in a part corresponding to a pixel position of white display. The display apparatus realizes improved contrast while suppressing decrease in brightness in white display.

Description

[0001] Cross References to Related Applications [0002] The present application contains subject matter related to Japanese Priority Patent Application JP 2008-190528 filed in the Japan Patent Office on Jul. 24, 2008, the entire content of which is hereby incorporated by reference. technical field [0003] The present invention relates to a display device having a polarization control element capable of performing polarization control using a control signal between a light source and a display panel. Background technique [0004] Conventionally, liquid crystal display devices are used as display devices for personal computers, televisions, cellular phones, and the like. In general, a liquid crystal display device has a structure in which a liquid crystal display panel obtained by sandwiching a liquid crystal cell between a pair of transparent electrodes is sandwiched by a pair of polarizing plates whose transmission axes are orthogonal to each other. Images are displayed b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02F1/1347G09G3/34G09G3/36
CPCG09G3/3426G02F1/133536G02F2203/30G02F1/13471G09G3/3611G02B6/0038G09G2320/0238G02F2001/133607G02F1/13362G02F2001/133601G09G2320/0646G02F1/133603G09G2320/066G02F1/133615G09G2300/023G02F2203/64G02F2001/133507G02B6/0053G02F1/133507G02F1/133601G02F1/133607
Inventor 濑上正晴奥山健太郎
Owner SONY CORP