DISPLAY DEVICES AND ELECTRONIC DEVICES

• US 20090040174A1
• Filed: 08/07/2008
• Published: 02/12/2009
• Est. Priority Date: 08/10/2007
• Status: Abandoned Application

• Current Assignee: InnoLux Corporation
• Original Assignee: TPO Displays Corporation (InnoLux Corporation)
• Inventors: YAMASHITA, Keitaro
• Application Number:
  US12/187,626
• Publication Number:
  US 20090040174A1
• Time in Patent Office: Days
• US Class Current: 345/104
• 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: G06V 40/1318 using electro-optical elements or layers, e.g. electroluminescent sensing
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

Display devices with image sensors are provided. Display pixel portions are disposed at intersections of gate lines and source lines and arranged as a matrix. Each display pixel portion includes a liquid crystal element, a photo detector detecting an incident light, a hold device sustaining an analog first data corresponding to a light flux of the incident light detected by the photo detector, and a data determination device generating a second data according to the first data sustained by the hold device. A gate driver selectively activates the gate lines. A source driver provides display data to the source lines. An output device retrieves the analyzed output data. The analyzed output data is the second data output by the data determination device through the source lines. A sensitivity control device changes a determination base of the analyzed output data corresponding to the intensity of the incident light.

Claims

1. A display device, comprising:

a plurality of display pixel portions disposed at intersections by columns of gate lines and rows of source lines and arranged as a matrix, wherein each display pixel portion comprises;

a liquid crystal element;

a photo detector detecting an incident light;

a hold device sustaining an analog first data corresponding to a light flux of an incident light detected by the photo detector; and

a data determination device generating a second data according to the first data sustained by the hold device;

a gate driver selectively activating the gate lines;

a source driver providing display data to the source lines;

an output device retrieving an analyzed output data, wherein the analyzed output data is the second data output by the data determination device through the source lines; and

a sensitivity control device changing a determination base of the analyzed output data corresponding to intensity of the incident light.

2. The display device as claimed in claim 1, wherein the photo detector is a photodiode.

3. The display device as claimed in claim 2, wherein the hold device is a capacitive element connected to the photo detector via a switch.

4. The display device as claimed in claim 3, wherein the data determination device comprises a voltage comparator varying status according to a voltage generated by charges stored in the capacitive element.

5. The display device as claimed in claim 1, wherein the sensitivity control device controls functions of the photo detector by time division to control the first data.

6. The display device as claimed in claim 1, wherein the first data output by the photo detector is an electric current, and the photo detector controls the first data by controlling the magnitude of the electric current.

7. The display device as claimed in claim 1, wherein the hold device comprises a capacitor portion with a plurality of capacitors connected in parallel, and the sensitivity control device controls the first data by controlling the capacitance of the capacitor portion.

8. The display device as claimed in claim 7, wherein the capacitance of the plurality of capacitors is a value of the power of two.

9. The display device as claimed in claim 4, wherein the sensitivity control device controls a determination of the voltage comparator for the first data by varying a reference voltage provided to the voltage comparator.

10. The display device as claimed in claim 1, wherein the sensitivity control device is a light flux controller to change the flux of a back light unit.

11. The display device as claimed in claim 1, wherein the sensitivity control device is a voltage controller changing voltage applied to the liquid crystal element to change transmission thereof.

12. The display device as claimed in claim 11, wherein the sensitivity control device changes a determination base of the analyzed output data to a value of the power of two.

13. An electronic device comprising the display device as claimed in claim 12, wherein the electronic device comprises mobile phones, digital cameras, personal digital assistances (PDAs), notebook computers, desktop computers, televisions, car displays, global positioning systems (GPS), avionic displays, or portable DVD players.