Image displaying systems

• US 20090102814A1
• Filed: 10/01/2008
• Published: 04/23/2009
• Est. Priority Date: 10/19/2007
• Status: Active Grant

• Current Assignee: InnoLux Corporation
• Original Assignee: TPO Displays Corporation (InnoLux Corporation)
• Inventors: Lin, Wei-Cheng, Chang, Ting-Kuo
• Granted Patent: US 8,125,465 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

An image displaying system is provided, in which a touch panel comprises a transparent substrate with a first surface and a second surface opposite to the first surface, a black matrix, a protection layer, at least one first transparent electrode, a planarization layer, a color filter and a common electrode. The black matrix is disposed on the second surface to define at least one transparent region. The protection layer is disposed on the black matrix and the transparent region, and the first transparent electrode is disposed on the protection layer and within the transparent region, wherein the first transparent electrode, the transparent substrate and an external electrode form a touch sensing capacitor. The planarization layer is disposed on the protection layer and the first transparent electrode, the color filter is disposed on the planarization layer, and the common electrode is disposed on the planarization layer and covering the color filter.

Claims

1. An image displaying system, comprising:

a touch panel comprising;

a transparent substrate comprising a first surface and a second surface opposite to the first surface,

a black matrix disposed on the second surface of the transparent substrate to define at least one transparent region;

a protection layer disposed on the black matrix and the transparent region;

at least one first transparent electrode disposed on the protection layer and within the transparent region, wherein the first transparent electrode, the transparent substrate and an external electrode form a first touch sensing capacitor;

a planarization layer disposed on the protection layer and the first transparent electrode;

a color filter disposed on the planarization layer; and

a common electrode disposed on the planarization layer and covering the color filter.

2. The image displaying system as claimed in claim 1, wherein the color filter is aligned to the transparent region and comprises a red region, a green region and a blue region.

3. The image displaying system as claimed in claim 2, wherein the first transparent electrode is disposed on the transparent region and the black matrix.

4. The image displaying system as claimed in claim 3, further comprises an array substrate disposed opposite the touch panel, wherein the array substrate comprises a plurality of data lines, a plurality of scan lines, a plurality of pixel elements and a touch sensing circuit.

5. The image displaying system as claimed in claim 4, wherein the planarization layer has at least one opening to expose a portion of the first transparent electrode, and the exposed first transparent electrode is electrically coupled to the touch sensing circuit on the array substrate.

6. The image displaying system as claimed in claim 5, wherein the exposed first transparent electrode is electrically coupled to the touch sensing circuit on the array substrate by at a metal ball or air.

7. The image displaying system as claimed in claim 4, further comprising a display panel comprising:

the touch panel;

the array substrate; and

a controller coupled to the array substrate to control the pixel elements, such that the display panel displays images and provides a touch function according to data sensed by the touch sensing circuit.

8. The image displaying system as claimed in claim 7, wherein the image displaying system comprises an electronic device, and the electronic device comprises the display panel.

9. The image displaying system as claimed in claim 1, wherein the electronic device comprises a notebook computer, a mobile phone, a digital camera, a personal digital assistant, a desktop computer, a television, a car display, a global positioning system (GPS), an aviation display or a portable digital versatile disc (DVD) player.

10. The image displaying system as claimed in claim 3, further comprising:

a touch sensing circuit disposed on the transparent substrate; and

an array substrate comprising a plurality of data lines, a plurality of scan lines and a plurality of pixel elements.

11. The image displaying system as claimed in claim 10, wherein the touch panel further comprises a conductive layer disposed between the black matrix and the first transparent electrode to electrically connect the first transparent electrode to the touch sensing circuit of the transparent substrate.

12. The image displaying system as claimed in claim 11, further comprising a display panel comprising:

the touch panel disposed opposite the array panel;

a first controller disposed on a first circuit board and coupled to the array substrate to control the pixel elements such that the display panel displays images; and

a second controller disposed on a second circuit board and coupled to the touch sensing circuit of the transparent substrate to provide a touch function.

13. The image displaying system as claimed in claim 1, wherein the first transparent electrode, the transparent substrate and an external electrode form a first touch sensing capacitor, and the first transparent electrode is extended along a first direction, and the touch panel further comprises:

at least one second transparent electrode disposed in the planarization layer, wherein the second transparent electrode is extended along a second direction intersecting the first direction, and the second transparent electrode, the transparent substrate and the external electrode form a second touch sensing capacitor.

14. The image displaying system as claimed in claim 13, wherein the first direction is perpendicular to the second direction.

15. The image displaying system as claimed in claim 13, wherein the touch panel further comprises a plurality of conductive layers disposed between the black matrix and the first transparent electrode and between the black matrix and the second transparent electrode, to electrically connect the first and second transparent electrodes to a touch sensing circuit on an array substrate.

16. The image displaying system as claimed in claim 13, wherein the planarization layer has at least one opening to expose a portion of the second transparent electrode, and the exposed first transparent electrode is electrically coupled to a touch sensing circuit on an array substrate.

17. The image displaying system as claimed in claim 16, wherein the exposed second transparent electrode is electrically connected to the touch sensing circuit on the array substrate by a metal ball.

18. A touch sensing circuit, disposed in a touch panel, comprising:

an integral circuit coupled to an induction electrode to accumulate voltage differences caused by capacitance variations on the induction electrode according to an alternative current driving signal; and

an amplifier amplifying the accumulated voltage difference from the integral circuit.

19. The touch sensing circuit as claimed in claim 18, further comprising a coupling capacitor coupled between the induction electrode and the integral circuit.

20. The touch sensing circuit as claimed in claim 19, further comprising a switching element coupled between the integral circuit and the amplifier to transfer the accumulated voltage difference from the integral circuit to the amplifier at every predetermined time interval.