Color filter integrated with sensor array for flat panel display

• US 20050243023A1
• Filed: 04/06/2005
• Published: 11/03/2005
• Est. Priority Date: 04/06/2004
• Status: Abandoned Application

• Current Assignee: Leadin Technology Co., Ltd.
• Original Assignee: Leadin Technology Co., Ltd.
• Inventors: Reddy, Damoder, Naugler, W. Edward Jr.
• Application Number:
  US11/100,668
• Publication Number:
  US 20050243023A1
• Time in Patent Office: Days
• US Class Current: 345/48
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2310/0259 with use of an analog or digital ramp generator in the column driver or in the pixel circuit
• CPC Class Codes: G09G 2310/0267 Details of drivers for scan electrodes, other than drivers for liquid crystal, plasma or OLED displays
• CPC Class Codes: G09G 2310/0275 Details of drivers for data electrodes, other than drivers for liquid crystal, plasma or OLED displays, not related to handling digital grey scale data or to communication of data to the pixels by means of a current
• CPC Class Codes: G09G 2320/0209 Crosstalk reduction, i.e. to reduce direct or indirect influences of signals directed to a certain pixel of the displayed image on other pixels of said image, inclusive of influences affecting pixels in different frames or fields or sub-images which constitute a same image, e.g. left and right images of a stereoscopic display
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2360/148 the light being detected by light detection means within each pixel
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

The embodiments of the present invention provide a color filter integrated with a sensor array and methods of fabricating the same. By integrating the sensor array with the color filter, the overall cost of the display is reduced. Moreover, the integration allows the sensor array to be used like a touch screen for data input. As a further benefit, the integration allows the color filter to serve as a light shield thus eliminating the need for a separate light shield for the sensor array.

Claims

1. A color filter for use in a display, comprising:

a plurality of color filter elements formed on a substrate and organized in groups, each color element in a group being associated with a different color; and

a first array of sensors aligned with the color filter elements and formed on the substrate.

2. The color filter of claim 1, wherein each sensor in the array of sensors comprises a TFT.

3. The color filter of claim 1, further comprising a first transparent layer covering the color filter elements.

4. The color filter of claim 3, wherein the first array of sensors is formed over the first transparent layer.

5. The color filter of claim 4, further comprising a first group of conductive lines formed over the first transparent layer and in contact with respective rows of sensors.

6. The color filter of claim 5, further comprising a second group of conductive lines formed over the first transparent layer and in contact with respective rows of sensors.

7. The color filter of claim 4, further comprising a second group of conductive lines in contact with respective columns of sensors, the second group of conductive lines being isolated from the first group of conductive lines by a second transparent layer.

8. The color filter of claim 1, wherein each sensor corresponds to a subpixel in the display and a color element.

9. The color filter of claim 1, further comprising a second array of sensors over the first array of sensors and aligned with the first array of sensors.

10. The color filter of claim 9, wherein the second array of sensors are interconnected by conductive lines running orthogonal to conductive lines interconnecting the first array of sensors.

11. The color filter of claim 1 wherein the substrate is glass, or quartz, or plastic.

12. The color filter of claim 1 wherein the sensor array comprises a light sensitive material.

13. The color filter of claim 12 wherein the light sensitive material is amorphous silicon, polysilicon, or cadmium selenide.

14. The color filter of claim 1 wherein the sensor array comprises optically sensitive resisters, optically sensitive diodes, or optically sensitive transistors.

15. The color filter of claim 1 wherein each sensor in the sensor array includes an isolation transistor.

16. The color filter of claim 13 wherein the isolation transistor comprises amorphous silicon, polysilicon, or cadmium selenide.

17. A method for fabricating a color filter integrated with a sensor array, comprising:

forming a plurality of color filter elements on a transparent substrates;

covering the plurality of color filter elements with a first layer of a transparent material;

forming a first array of sensors on the first layer of transparent material; and

forming on the first layer of transparent material a first group of conductive lines each connected to a row of sensors.

18. The method of claim 17, further comprising:

forming on the first layer of transparent material a second group of conductive lines each connected to a row of sensors.

19. The method of claim 17, further comprising:

covering the plurality of sensors and the first layer of transparent material with a second layer of a transparent material.

21. The method of claim 19, further comprising:

forming on the second layer of transparent material a second group of conductive lines running in a direction orthogonal to the first group of conductive lines and aligned with the contacts.

22. The method of claim 19, further comprising:

forming on the second layer of transparent material gates of a plurality of TFTs each associated with a sensor.

23. The method of claim 19, further comprising:

forming on the second layer of transparent material a second array of sensors; and

forming on the second layer of transparent material a second group of conductive lines each connected to a column of sensors in the second array of sensors, the second group of conductive lines running orthogonal to the first group of conductive lines.

20. The method of claim 119, further comprising:

forming contacts aligned with the sensors in the second layer of transparent material.

24. A display, comprising:

a display component comprising a plurality of subpixels organized in groups and formed on a first substrate, each subpixel in a group being associated with a different color; and

a filter component, comprising;

a plurality of color filter elements organized in groups and formed on a second substrate, each group of color filter elements corresponding to a respective group of subpixels in the display component, each color element in a group being associated with a different color; and

an array of sensors formed on the second substrate and aligned with the plurality of subpixels and with the plurality of color filter elements; and

wherein each sensor has an associated electrical parameter dependent on a level of light emissions received from a respective subpixel thereby an electrical feedback parameter or signal dependent on the received level of light emissions is used to control the luminance of the respective subpixel

25. The display of claim 24, wherein the color filter component further comprises a first transparent layer formed on the second substrate and covering the color filter elements, and wherein the array of sensors is formed over the first transparent layer.

26. The display of claim 25, wherein the color filter component further comprises a first group of conductive lines formed over the first transparent layer and in contact with respective rows of sensors.

27. The display of claim 26, wherein the color filter component further comprises a second group of conductive lines in contact with respective columns of sensors, the second group of conductive lines being isolated from the first group of conductive lines by a second transparent layer.