Liquid crystal display device viewable from both surfaces and portable apparatus using same

surface display technology, applied in the direction of mirrors, devices with multiple display units, identification means, etc., can solve the problems of high cost of using two liquid crystal display elements as described above, limited mounting space for a liquid crystal display device, and inability to use liquid crystal display devices in portable apparatuses. to achieve the effect of reducing the occupation area

Inactive Publication Date: 2006-01-19
CASIO COMPUTER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] It is an object of the present invention to provide a liquid crystal display device which is capable of both surface display using one liquid crystal display element, capable of reducing its occupation area, and capable of displayi

Problems solved by technology

However, using two liquid crystal display elements as described above costs high, and both surface display with the use of one liquid crystal display element is desired.
Accordin

Method used

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  • Liquid crystal display device viewable from both surfaces and portable apparatus using same
  • Liquid crystal display device viewable from both surfaces and portable apparatus using same
  • Liquid crystal display device viewable from both surfaces and portable apparatus using same

Examples

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first embodiment

[0065] An embodiment of a liquid crystal display device of the present invention will now be explained below. FIG. 1 to FIG. 5 show a liquid crystal display device according to a first embodiment of the present invention. FIG. 1 is an exploded perspective view of the liquid crystal display device, and FIG. 2 is a fragmentary sectional view of the liquid crystal display device.

[0066] As shown in FIG. 1 and FIG. 2, the liquid crystal display device according to the present embodiment comprises a liquid crystal display element 1, and a surface light source 25 arranged in front (in the upper part in the drawings) of the liquid crystal display element 1 (in the upper part in the drawings).

[0067] The liquid crystal display element 1 comprises a liquid crystal cell 2, reflection / permeation means 10 provided at the back (in the lower part in the drawings) of a liquid crystal layer 5 of the liquid crystal cell 2, and a front polarizing plate 16 and a back polarizing plate 17 which are arra...

second embodiment

[0129]FIG. 6 is a fragmentary sectional view of a liquid crystal display device according to a second embodiment of the present invention. The liquid crystal display element 1 of the liquid crystal display device of the present embodiment is provided with a reflection film 14 as reflection / permeation means behind the liquid crystal layer 5 of the liquid crystal cell 2. The reflection film 14 has open portions 14a each of which is formed in a region 82 defined in each of a plurality of pixels 80 of the liquid crystal cell 2, and reflection portions 14b each of which is formed in another region 81 defined in each of the plurality of pixels 80. The reflection film 14 is a partial reflection / permeation layer 14 which reflects, of a light coming to each of the plurality of pixels 80, a light that comes to the reflection portions 14b, and lets a light that comes to the open portions 14a permeate therethrough. In the present embodiment, it is preferable that the reflection film 14 be a sin...

third embodiment

[0138]FIG. 7 is a fragmentary sectional view of a liquid crystal display device according to a third embodiment of the present invention. The liquid crystal display element 1 of the liquid crystal display device of the present embodiment is provided as reflection / permeation means, behind the liquid crystal layer 5 of the liquid crystal cell 2, with a polarized light separating element 15 for reflecting, of two different polarized components of an incident light, one polarized component, and letting the other polarized component permeate therethrough.

[0139] In the present embodiment, the polarized light separating element 15 is a reflecting / polarizing element for reflecting, of two linearly-polarized components orthogonal to each other of an incident light, one polarized component, and letting the other polarized component permeate therethrough. In the present embodiment, a reflecting / polarizing plate which has a permeation axis and a reflection axis (both not illustrated) in orthog...

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Abstract

In front of a liquid crystal display element (1), a surface light source (25) is arranged which emits a light toward the liquid crystal display element (1) and lets lights coming from its front and its back permeate therethrough. The liquid crystal display element (1) has reflection/permeation means (10) which is provided behind a liquid crystal cell (2) and a liquid crystal layer (5), and which reflects a part of a light that comes to each of a plurality of pixels (80) from the front of the liquid crystal cell (2), and lets the other part of the light permeate the reflection/permeation means (10).

Description

TECHNICAL FIELD [0001] The present invention relates to a both surface display type liquid crystal display device and a portable apparatus having a both surface display function. BACKGROUND ART [0002] As disclosed in Unexamined Japanese Patent Application KOKAI Publication No. H10-90678 and Unexamined Japanese Patent Application KOKAI Publication No. 2001-290445, a liquid crystal display device in which two liquid crystal display elements are disposed back to back with their display surfaces facing the opposite directions from each other, and a surface light source for emitting a light toward both the liquid crystal display elements is disposed between them, is known as a both surface display type liquid crystal display device to be used in a portable apparatus such as a portable phone, which has a display function on both surfaces of its case. [0003] However, using two liquid crystal display elements as described above costs high, and both surface display with the use of one liquid...

Claims

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Application Information

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IPC IPC(8): G02F1/1335G02B5/08G02F1/13357G09F9/35G09F9/40H04M1/02
CPCG02F1/133536G02F1/133555G02F2001/133342H04M2250/16G02F2203/09H04M1/0214G02F2001/133616G02F1/133342G02F1/133616G02F1/1335
Inventor NISHINO, TOSHIHARUARAI, NORIHIROKOBAYASHI, KUNPEI
Owner CASIO COMPUTER CO LTD
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