Liquid crystal cells – elements and systems – Particular structure – Particular illumination
Reexamination Certificate
2000-12-01
2008-10-07
Nguyen, Dung T. (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Particular illumination
C349S065000, C362S035000
Reexamination Certificate
active
07432999
ABSTRACT:
A fluorescent lamp6emits illumination light (primary light), which is deflected by means of a light guide plate4to be converted into a light flux having an enlarged cross section. A liquid crystal display panel3is supplied with the light flux via a prism sheet (light control sheet)12. The prism sheet12or an alternative light control sheet to be employed is capable of rotating polarization involved by the light toward a direction of light transmission axis of a polarization plate14. An effective light input to the liquid crystal display panel3is achieved by light transmission through the polarization plate14at a high transmission rate. The liquid crystal display panel3controls polarization state of the inputted light and, according to the state, causes the light to pass through another polarization plate (analyser)15. Emission occurs, under intensity control depending on positions, via the polarization plate (analyzer)15, to provide an image. Polarization rotation function for modifying the emission of the light guide plate4can be obtained through manufacturing of a mother material of the prism sheet12by means of one-axle drawing process or two-axle drawing process. Prism cuts may be formed on a back face8or emission face11of the light guide plate4. A polarization-rotating sheet may be alternatively interposed between a prism sheet provided with no polarization-rotating ability and the polarization plate14.
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Enplas Corporation
Nguyen Dung T.
Staas & Halsey , LLP
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