Display device and electronic appliance
AssigneeNLT Technologies, Ltd.
InventorsKen Sumiyoshi, Koji Mimura, Yuji Kondo, Masatake Baba
Life of this patent
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Abstract
To provide a liquid crystal display device capable of switching the range of viewing angles while being able to reduce the cost and thickness of the device, and to provide an electronic appliance having the same. The display device according to the present invention includes: a liquid crystal type display panel having a diffusive reflection part which diffusively reflects light irradiated from the front side while transmitting light from the back side; and a backlight source disposed on a back face of the display panel along the display panel for switchably outputting transmission light of different directivities.
Claims9
A display device, comprising:
- a display panel;
- a backlight source disposed on a back face of the display panel along the display panel;
- a front-face side light source which is disposed in front of a front-face side of the display panel, and which irradiates light toward the front-face side of the display panel from an oblique direction;
- and
- a diffusive reflection part, provided on the front-face side of the display panel between the front-face side light source and the front-face side of the display panel, which diffusively reflects light irradiated from the front-face side light source and transmits light from the backlight source transmitted through the display panel,
- wherein the backlight source comprises a light-flux control device which collimates the light output from the backlight source, and a transparent-diffusion control element that includes liquid crystal that is electrically switchable between a transparent state in which the collimated light is transmitted without a change in directivity and a scattering state in which the collimated light is diffused, and
- wherein the display device further comprises a control part which controls each of the backlight source, the front-face side light source, and the transparent-diffusion control element in association with each other to switch between a narrow view field mode and a wide view field mode.
A display device, comprising:
- a display panel;
- a backlight source disposed on a back face of the display panel along the display panel;
- a front-face side light source which is disposed in front of a front-face side of the display panel, and which irradiates light towards the front-face side of the display panel from an oblique direction;
- and
- a diffusive reflection means, provided on the front-face side of the display panel between the front-face side light source and the front-face side of the display panel, which diffusively reflects light irradiated from the front-face side light source and transmits light from the backlight source,
- wherein the backlight source comprises a light-flux control device which collimates the light output from the backlight source, and a transparent-diffusion control element that includes liquid crystal that is electrically switchable between a transparent state in which the collimated light is transmitted without a change in directivity and a scattering state in which the collimated light is diffused, and
- wherein the display device further comprises a control part which controls each of the backlight source, the front-face side light source, and the transparent-diffusion control means in association with each other to switch between a narrow view field mode and a wide view field mode.
Dependencies are inferred from the claim text.