Half reflection type liquid crystal display device having matched phase of transmitted and reflected light
First Claim
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1. A liquid crystal panel in which a liquid crystal layer is sandwiched between an upper substrate which is provided with upper transparent electrodes for forming pixels, and a lower substrate, which is provided with lower transparent electrodes disposed so as to intersect with said upper transparent electrodes, said liquid crystal panel comprising:
- a half reflection layer having a reflection function and a transmission function which is formed on the inner surface of said lower substrate as a lower layer of said lower transparent electrodes;
an upper retardation film, an upper polarizing plate and a light diffusing plate, which are laminated on said upper substrate; and
a lower retardation film and a lower polarizing plate, which are laminated on the surface of said lower substrate; and
wherein the phase of said reflected light at said half reflecting layer and the phase of a transmitted light which passes through said half reflection layer from said lower substrate substantially agree with each other.
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Abstract
A liquid crystal display device is constructed such that a liquid crystal layer is sandwiched between an upper substrate, which is provided with upper transparent electrodes for forming pixels, and a lower substrate, which is provided with lower transparent electrodes disposed so as to intersect with the upper transparent electrodes. The liquid crystal panel includes a half reflection layer having a reflection function and a transmission function which is formed on the inner surface of the lower substrate as a lower layer of the lower transparent electrodes; an upper retardation film, an upper polarizing plate, and a light diffusing plate which are laminated on the upper substrate; and a lower retardation film and a lower polarizing plate, which are laminated on the surface of the lower substrate. Due to such a construction, the half reflection type liquid crystal display device is capable of providing an image display of high brightness and high contrast.
14 Citations
50 Claims
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1. A liquid crystal panel in which a liquid crystal layer is sandwiched between an upper substrate which is provided with upper transparent electrodes for forming pixels, and a lower substrate, which is provided with lower transparent electrodes disposed so as to intersect with said upper transparent electrodes, said liquid crystal panel comprising:
- a half reflection layer having a reflection function and a transmission function which is formed on the inner surface of said lower substrate as a lower layer of said lower transparent electrodes;
an upper retardation film, an upper polarizing plate and a light diffusing plate, which are laminated on said upper substrate; and
a lower retardation film and a lower polarizing plate, which are laminated on the surface of said lower substrate; and
wherein the phase of said reflected light at said half reflecting layer and the phase of a transmitted light which passes through said half reflection layer from said lower substrate substantially agree with each other. - View Dependent Claims (2, 3, 4)
- a half reflection layer having a reflection function and a transmission function which is formed on the inner surface of said lower substrate as a lower layer of said lower transparent electrodes;
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5. A liquid crystal panel in which a liquid crystal layer is sandwiched between an upper substrate, which is provided with upper transparent electrodes for forming pixels and a lower substrate, which is provided with lower transparent electrodes disposed so as to intersect with said upper transparent electrodes, said liquid crystal panel comprising:
- a half reflection layer having a reflection function and a transmission function which is formed on the inner surface of said lower substrate as a lower layer of said lower transparent electrodes;
an upper retardation film, an upper polarizing plate and a light diffusing plate, which are laminated on said upper substrate; and
a lower retardation film and a lower polarizing plate, which are laminated on the surface of said lower substrate;
said liquid crystal panel further including a color filter layer of a plurality of colors which is formed on the inner surface of said upper substrate as a lower layer of said upper transparent electrodes, and a passivation film formed between said color filter layer and said upper transparent electrodes, and the retardation Δ
nd of said lower retardation film being determined such that the phase of transmitted light which passes through said lower polarizing plate, said lower retardation film and said half reflection layer becomes equivalent to the phase of reflected light by said half reflection layer. - View Dependent Claims (6, 7, 8)
- a half reflection layer having a reflection function and a transmission function which is formed on the inner surface of said lower substrate as a lower layer of said lower transparent electrodes;
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9. A liquid crystal panel in which a liquid crystal layer is sandwiched between an upper substrate, which is provided with upper transparent electrodes for forming pixels, and a lower substrate, which is provided with lower transparent electrodes disposed so as to intersect with said upper transparent electrodes, said liquid crystal panel comprising:
- a half reflection layer having a reflection function and a transmission function which is formed on the inner surface of said lower substrate as a lower layer of said lower transparent electrodes;
an upper retardation film, an upper polarizing plate and a light diffusing plate which are laminated on said upper substrate; and
a lower retardation film and a lower polarizing plate, which are laminated on the surface, of said lower substrate, said liquid crystal panel further including a color filter layer of a plurality of colors which is formed on the inner surface of said upper substrate as a lower layer of said upper transparent electrodes, and a passivation layer formed between said color filter layer and said upper transparent electrodes, and wherein the phase difference between the phase of a transmitted light which passes through said lower polarizing plate, said lower retardation film and said half reflection layer and the phase of a reflected light at said half reflection layer is set within ±
π
/4 when a bright display is performed. - View Dependent Claims (10, 11, 12)
- a half reflection layer having a reflection function and a transmission function which is formed on the inner surface of said lower substrate as a lower layer of said lower transparent electrodes;
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13. A liquid crystal panel in which a liquid crystal layer is sandwiched between an upper substrate and a lower substrate, said liquid crystal panel comprising:
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a half reflection layer having a reflection function and a transmission function, said half reflection layer being disposed at an inner surface of said lower substrate;
an upper retardation film and an upper polarizing plate being laminated on a surface of said upper substrate; and
a lower retardation film and a lower polarizing plate being laminated on a surface of said lower substrate;
wherein a phase difference of a polarization condition of reflected light at said half reflection layer and a phase difference of a polarization condition of transmitted light which passes through said half reflection layer from said lower substrate substantially agree with each other. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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21. A liquid crystal panel in which a liquid crystal layer is sandwiched between an upper substrate and a lower substrate, said liquid crystal panel comprising:
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a half reflection layer having a reflection function and a transmission function, said half reflection layer being disposed at an inner surface of said lower substrate;
an upper retardation film and an upper polarizing plate being laminated on said upper substrate; and
a lower retardation film and a lower polarizing plate being laminated on a surface of said lower substrate;
wherein a retardation Δ
nd of said lower retardation film is determined so that a phase difference of a polarization condition of transmitted light which passes through said lower polarizing plate, said lower retardation film and said half reflection layer becomes substantially equivalent to a phase difference of a polarization condition of reflected light by said half reflection layer. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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29. A liquid crystal panel in which a liquid crystal layer is sandwiched between an upper substrate and a lower substrate, said liquid crystal panel comprising:
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a half reflection layer having a reflection function and a transmission function, said half reflection layer being disposed at an inner surface of said lower substrate;
an upper retardation film and an upper polarizing plate being laminated on said upper substrate; and
a lower retardation film and a lower polarizing plate being laminated on a surface of said lower substrate;
wherein a difference between a phase difference of a polarization condition of transmitted light which passes through said lower polarizing plate, said lower retardation film and said half reflection layer and a phase difference of a polarization condition of reflected light at said high reflection layer is set within ±
π
/4 when a bright display is performed. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36)
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37. A liquid crystal panel in which a liquid crystal layer is sandwiched between an upper substrate and a lower substrate, said liquid crystal panel comprising:
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a half reflection layer having a reflection function and a transmission function, said half reflection layer being disposed at an inner surface of said lower substrate;
an upper retardation film and an upper polarizing plate being laminated on a surface of said upper substrate; and
a lower retardation film and a lower polarizing plate being laminated on a surface of said lower substrate;
wherein a phase difference of a polarization condition of reflected light at said half reflection layer and a phase difference of a polarization condition of transmitted light which passes through said half reflection layer from said lower substrate substantially agree with each other when a bright display is performed. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. A liquid crystal panel in which a liquid crystal layer is sandwiched between an upper substrate and a lower substrate, said liquid crystal panel comprising:
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a half reflection layer having a reflection function and a transmission function, said half reflection layer being disposed at an inner surface of said lower substrate;
an upper retardation film and an upper polarizing plate being laminated on said upper substrate; and
a lower retardation film and a lower polarizing plate being laminated on a surface of said lower substrate;
wherein a retardation Δ
nd of said lower retardation film is determined so that a phase difference of a polarization condition of transmitted light which passes through said lower polarizing plate, said lower retardation film and said half reflection layer becomes substantially equivalent to a phase difference of a polarization condition of reflected light by said half reflection layer when a bright display is performed. - View Dependent Claims (45, 46, 47, 48, 49, 50)
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Specification
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Current AssigneePanasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
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Original AssigneeHitachi Device Engineering Co., Ltd., Hitachi, Ltd.
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InventorsSuzuki, Masaru, Saitou, Terunori, Kubo, Kiichirou, Nagashima, Yoshikuni
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Primary Examiner(s)Chowdhury, Tarifur R.
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Assistant Examiner(s)Qi, Mike
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Application NumberUS10/244,662Time in Patent Office1,323 DaysField of Search349/188, 349/117, 349/169, 349/162, 349/114, 349/113US Class Current349/114CPC Class CodesG02F 1/13338 Input devices, e.g. touch p...G02F 1/133555 TransflectorsG02F 1/13363 Birefringent elements, e.g....G02F 1/1397 the twist being substantial...G02F 2001/133557 Half-mirrorG02F 2413/02 Number of plates being 2
