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Head up display unit, liquid crystal display panel, and method of fabricating the liquid crystal display panel
| Details |
Inventors: Asakawa, Shiro; Tsutsui, Hiroshi; Taketomi, Yoshinao; Okuda, Eiichiro;
Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP)
Primary Examiner: Spyrou; Cassandra
Assistant Examiner: Schuberg; Darren E.
Attorney, Agent or Firm: Ratner & Prestia
A head up display unit equipped at least with transparent and flat image information display means, transparent and flat light irradiating means arranged in an opposed and close contact relationship with the image information display means, light supply means for supplying light to the light irradiating means, image-display control means for controlling image display, and light-supply control means for controlling light supply. The display unit is a compact head up display unit which can be used in any place in the interior of an automobile. |
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DETAILED DESCRIPTION We claim: 1.
A head up display unit comprising: transparent and flat image information display means having a front surface; transparent and flat light irradiating means, said light irradiating means between said image information display means and a user; light supply means for supplying light to a surface of said light irradiating means, said light irradiating means reflecting said light from said front surface of said image information display means; image-display control means for controlling an image display of said image information display means; and light-supply control means for controlling the light supply of said light supply means.
2.
The head up display unit as set forth in claim 1, wherein said transparent and flat image information display means is one selected from a group of a liquid crystal panel, a polymer dispersed liquid crystal panel, and a ferroelectric thin film.
3.
The head up display unit as set forth in claim 1, wherein said light irradiating means has optical-path converting means for emitting incident light which was incident from said light supply means arranged on part or all of the peripheral end face of said light irradiating means, in a surface direction of said light irradiating means.
4.
The head up display unit as set forth in claim 3, wherein said optical-path converting means is one selected from a group of a volume phase hologram, a phase diffraction grating comprising asymmetrical unevenness, and a half mirror.
5.
The head up display unit as set forth in claim 4, wherein said optical-path converting means is a volume phase hologram having a plurality of sections, and at least a first section of the said plurality of sections is different than a second section of said plurality of sections.
6.
The head up display unit as set forth in claim 1, wherein said light supply means is a light source itself emitting light, such as various kinds of lamps, a discharge tube, electroluminescence, a plasma illuminant, a light emitting diode, and a laser, or is a phosphor and a light source which excites said phosphor
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