Display device, method, and terminal device having switchable viewing angle

A technology of viewing angle and equipment, which is applied in the field of display equipment, can solve the problems of difficult to watch images, failure to overcome, and color shift, and achieve the effect of suppressing changes in brightness and hue

Active Publication Date: 2007-02-07
NEC LCD TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, the brightness changes significantly from before to after switching, and the image becomes extremely difficult for the user to view
[0013] The second problem is that before and after the switch, there is a color shift
[0014] As described above, a problem with switchable display devices is that the display state significantly changes from before switching to after switching
However, in Japanese Unexamined Published Patent Application No. 2005-115021, the problem of changes in wavelength distribution and color tone during switching between wide angle and narrow angle is not overcome

Method used

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  • Display device, method, and terminal device having switchable viewing angle
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  • Display device, method, and terminal device having switchable viewing angle

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Embodiment Construction

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. figure 1 is a diagram of a liquid crystal display device with a switchable viewing angle according to an embodiment of the present invention. Planar light is emitted from the planar light source 1 as a backlight, and enters the liquid crystal display panel 2 through the switching element 6 .

[0034] The planar light source 1 may be a bottom-emitting planar light source or a side-emitting planar light source. The bottom-emitting planar light source includes a light source and a diffuser plate placed on the light source. The side-emitting planar light source includes an optical waveguide and a light source placed beside the optical waveguide. In any of these cases, the brightness of the planar light source varies according to the luminous flux of the light source. The brightness of the planar light source 1 is adjusted by the light source control...

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Abstract

After light from a planar light source is switched to scattered light or collimated light by a switching element, the light is incident on a display panel, and an image is displayed. At this time, the luminance of the planar light source is adjusted, the contrast voltage of the display panel is reset, and adjustment is performed so that the luminance and hue of the frontal image does not vary before and after switching.

Description

technical field [0001] The present invention relates to a display device, a method and a terminal device with switchable viewing angles, which can be switched between a narrow-angle mode and a wide-angle mode, so that the range of viewing angles can be switched. Background technique [0002] Recently, there is a need in display devices for security features that prevent viewing by people other than the main person viewing the display device (ie, people in the vicinity of the display device). For example, in a financial terminal or a similar terminal called an ATM (Automatic Teller Machine), a security code or other confidential information must be entered by touching numeric buttons displayed on a display device, and the user must prevent others from recognizing the information. Features are also needed in mobile phones and the like to prevent incoming call information from being seen by others in the vicinity of the primary user. When using PDAs (Personal Digital Assistant...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/133G09G3/36
CPCG02F1/133605G09G2300/0456G09G3/3629G02F1/1323G09G2320/028
Inventor 住吉研三村广二
Owner NEC LCD TECH CORP
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