EP0224869A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Transmitting type display device
Assignee: Hosiden Corp
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Filing: 1986-11-27
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Granted: —
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Expires: 2006-11-27
Abstract
Abstract A transmitting type display device is disclosed, which comprises a transmitting type display panel (11) to provide a display on the front surface, a light source (15) for producing light illuminating the back surface of the transmitting type display (11) and a brightness controller (25) for controlling the intensity of light from the light source (15). The device comprises an ambient light detector (17) disposed near the transmitting type display panel (11) for detecting the intensity of ambient light incident on the display surface of the transmitting type display panel (11), and the brightness controller (25) for controlling the light source (15) according to the detection output of the ambient light detector (17) such that the intensity of light from the light source (15) to the transmitting type display panel (11) is increased with an increase of the detected light intensity.
Inventors
- 👤 Shigeo Aoki
- 👤 Yasuhiro Ukai
- 👤 Masaru Yasui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 20:02
CPC Classifications
G; G09; G09F; G09F13/00; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133604; G02F1/13306; G02F1/13318; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/3406; G02F2201/00; G02F2201/58; G09G2320/00; G09G2320/06; G09G2320/0626; G09G2320/0633; G09G2360/00; G09G2360/14; G09G2360/144
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A transmitting type display device comprising a transmitting type display panel (11) to provide a display on the front surface, a light source (15) for producing light illuminating the back surface of said transmitting type display (11) and a brightness controller (25) for controlling the intensity of light from said light source (15), characterized by: an ambient light detector (17) disposed near said transmitting type display panel (11) for detecting the intensity of ambient light incident on the display surface of said transmitting type display panel (11), and said brightness controller (25) for controlling said light source according to the detection output of said ambient light detector (17) such that the intensity of light from said light source (15) to said transmitting type display panel (11) is increased with an increase of the detected light intensity.
Claim 2
Dependent Claim
136 words
A transmitting type display device comprising a transmitting type display panel (11) to provide a display on the front surface, a light source (15) for producing light illuminating the back surface of said transmitting type display (11) and a brightness controller (25) for controlling the intensity of light from said light source (15), characterized by: an ambient light detector (17) disposed near said transmitting type display panel (11) for detecting the intensity of ambient light incident on the display surface of said transmitting type display panel (11), and said brightness controller (25) for controlling said light source according to the detection output of said ambient light detector (17) such that the intensity of light from said light source (15) to said transmitting type display panel (11) is increased with an increase of the detected light intensity.
Claim 3
Dependent Claim
43 words
The transmitting type display device according to claim 1, wherein said transmitting type display panel (11) is mounted in a housing (14) such as to close a front opening (14a) formed therein, and said light source (15) is disposed in said housing (14).
Claim 4
Dependent Claim
59 words
The transmitting type display device according to claim 2, wherein said ambient light detector (17) is formed on a projecting portion of a transparent substrate (12) of said transmitting type display panel (11), and a light-blocking layer (23) is formed on said transparent substrate (12) for shielding said ambient light detector (17) from light from said light source (15).
Claim 5
Dependent Claim
104 words
The transmitting type display device according to claim 3, wherein said transmitting type display panel (11) is a liquid crystal display panel including first and second transparent substrates (12, 13) and a liquid crystal (51) sealed therebetween, pixel electrodes (52) and thin-film transistors (53) for selectively driving said pixel electrodes (52) are formed on the inner surface of said first transparent substrate (12), said first transparent substrate (12) having said projecting portion projecting from said second transparent substrate (13), said ambient light detector (17) being formed on the same surface of said first transparent substrate (12) as said thin-film transistors (53) are formed on.
Claim 6
Dependent Claim
154 words
The transmitting type display device according to claim 4, wherein said thin-film transistors (53) each have source and drain electrodes (41, 42) formed on said first transparent substrate (12), a semiconductor layer (43) of amorphous silicon formed to stride said source and drain electrodes (41, 42), a gate insulating layer (44) formed on said semiconductor layer (43) and a gate electrode (45) formed on said gate insulating layer (44), and said ambient light detector (17) includes a pair of comb-like electrodes (18, 19) formed in a mutually interlaced arrangement and of the same material as said source and drain electrodes (41, 42) on said first transparent substrate (12), an amorphous silicon layer (21) of the same material as said semiconductor layer (43) formed to extend over said comb-like electrodes (18, 19) and a protective insulating layer (22) of the same material as said gate insulating layer (44) formed on said amorphous silicon layer (21).
Claim 7
Dependent Claim
94 words
The transmitting type display device according to claim 4, which further comprises a back light detector (26) for detecting the intensity of light incident on the back surface of said transmitting type display panel (11), the detection output of said back light detector (26) being fed to said brightness controller (25), whereby said light source (15) is controlled such that the intensity of light incident from said light source (15) on the back surface of said transmitting type display panel (11) is reduced with increasing light intensity detected by said back light detector (26).
Claim 8
Dependent Claim
55 words
The transmitting type display device according to claim 6, wherein said back light detector (26) is formed on said projecting portion of said first transparent substrate (12) and a light-blocking layer (27) is formed on said first transparent substrate (12) for blocking ambient light incident to said back light detector (26) from the front side.
Claim 9
Dependent Claim
83 words
The transmitting type display device according to claim 7, which further comprises a substracter means (31) for producing the difference between the detection outputs of said ambient light detector (17) and said back surface light detector (26), an adder means (33) for producing the sum of the output of said substractor means (31) and the output of a variable reference brightness setter (32) and a light control means (35) for controlling said light source (15) according to the output of said adder means.
Claim 10
Dependent Claim
67 words
The transmitting type display device according to claim 6, wherein said back light detector (26) is formed in the same configuration as said ambient light detector (17) on the same surface of said first transparent substrate (12) as said thin-film transistors (53) are formed on and a second light-blocking layer (27) is formed on that same surface for shielding said back light detector (26) from ambient light.
References Cited (Backward Citations)
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