Light sensitive display

• US 20080055507A1
• Filed: 10/29/2007
• Published: 03/06/2008
• Est. Priority Date: 02/20/2002
• Status: Abandoned Application

• Current Assignee: Apple Inc.
• Original Assignee: Planar Systems Incorporated (Leyard Optoelectronic Co., Ltd.)
• Inventors: Abileah, Adiel, den Boer, Willem
• Application Number:
  US11/980,043
• Publication Number:
  US 20080055507A1
• Time in Patent Office: Days
• US Class Current: 349/42
• CPC Class Codes: G02F 1/13312 Circuits comprising photodetectors for purposes other than feedback
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G06F 1/1611 to support document holders
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 2203/04109 FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
• CPC Class Codes: G06F 3/03542 Light pens for emitting or receiving light
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G06F 3/0488 : using a touch-screen or digitiser, e.g. input of commands through traced gestures
• CPC Class Codes: G06V 40/1318 : using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G09G 2300/0439 : Pixel structures
• CPC Class Codes: G09G 2300/0809 : Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0842 : forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/029 : by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
• CPC Class Codes: G09G 2320/0626 : for control of overall brightness
• CPC Class Codes: G09G 2360/144 : the light being ambient light
• CPC Class Codes: G09G 3/3648 : using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A light sensitive display.

Claims

1. A light sensitive display comprising:

(a) said display selectively causing pixels to provide light;

(b) a plurality of light sensitive elements located within said display, wherein said light sensitive elements are transistors; and

(c) a processor that determines at least one of said plurality of light sensitive elements that experiences a change in the light level to a level less than the ambient light level.

2. The display of claim 1 wherein each of said light sensitive elements includes a first transistor that senses ambient light, and a second transistor that is inhibited from sensing ambient light with respect to said first transistor.

3. A light sensitive display comprising:

(a) said display selectively causing pixels to provide light;

(b) a plurality of light sensitive elements located within said display suitable to sense ambient light;

(c) a processor that receives information from said light sensitive elements and determines regions of said display that experiences a change in the light level to a level less than the ambient light level and regions of said display where light in excess of said ambient light reaches said light sensitive elements.

4. A liquid crystal device comprising:

(a) a front electrode layer;

(b) a rear electrode layer comprising a plurality of pixel electrodes;

(c) a liquid crystal material located between said front electrode layer and said rear electrode layer;

(d) a plurality of light sensitive elements located within said display wherein each of said light sensitive elements includes a first transistor that senses ambient light, a second transistor that is inhibited from sensing ambient light with respect to said first transistor; and

(e) a processor that determines at least one of said plurality of light sensitive elements that experiences a change in the light level to a level less than the ambient light level.

5. The device of claim 4 wherein a terminal of said first transistor is connected to a terminal of said second transistor with a first conductor.