Touch signal transmission circuit for touch LCD

• US 20100007626A1
• Filed: 07/09/2008
• Published: 01/14/2010
• Est. Priority Date: 07/09/2008
• Status: Active Grant

• Current Assignee: CHI HSIN Electronics Corporation (InnoLux Corporation)
• Original Assignee: CHI HSIN Electronics Corporation (InnoLux Corporation)
• Inventors: Lai, Hui-Lung
• Granted Patent: US 8,149,207 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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

A touch signal transmission circuit for a touch control LCD is mounted to an inner side of an upper substrate of the LCD, having a first patterned electrode layer and a second patterned electrode layer, which are electrically insulated from each other and partially overlap each other in intervals to define a touch control section. Each of the first and second patterned electrode layers includes a plurality of electrodes in the shape of footsteps. The electrodes are interlaced with one another, having some parts overlapping and right corresponding to each other to define a plurality of touch-sensitive points. In this way, only fewer footstep-shaped electrodes are needed to cover the whole touch control section to decrease the number of bonding pads and pins of a touch control IC. Besides, a lot of touch sensitive points are closely disposed in the touch control section to keep quick detection and decoding.

Claims

1. A touch signal transmission circuit for a touch control display, said touch signal transmission circuit being mounted to an inner side of an upper substrate of a liquid crystal display (LCD), said touch signal transmission circuit comprising:

a first patterned electrode layer having a plurality of first electrodes arranged in apposition, said first electrodes having an inclined orientation in the shape of footsteps, each of said first electrodes having a upper contact point defined at each of tunings of the footsteps; and

a second patterned electrode layer formed on said first patterned electrode layer by electric insulation therebetween, said second and first patterned electrode layers overlapping each other to define a touch control section, said second patterned electrode layer having a plurality of second electrodes arranged in apposition, said second electrodes having the same inclined orientation as the first electrodes do and in the shape of footsteps, each of said second electrodes having a lower contact point defined at each of tunings of the footsteps and right corresponding to one of said upper contact points, each of said second electrodes being interlaced with one of said first electrodes.

2. The touch signal transmission circuit for a touch control display as defined in claim 1, wherein each of said electrodes of said first patterned electrode layer comprises a plurality of first-direction portions and a plurality of second-direction portions, said first-direction and second-direction portions being alternately connected with one another;

said upper contact points being located at where said first-direction and second-direction portions are connected.

3. The touch signal transmission circuit for a touch control display as defined in claim 2, wherein a first-direction interval defined between each two adjacent first or second electrodes is equal to a second-direction interval defined between each two adjacent first or second electrodes.

4. The touch signal transmission circuit for a touch control display as defined in claim 2, wherein a first-direction interval defined between each two adjacent first or second electrodes is not equal to a second-direction interval defined between each two adjacent first or second electrodes.

5. The touch signal transmission circuit for a touch control display as defined in claim 2 further comprising an insulative layer, wherein said insulative layer is located between said first and second patterned electrode layers.

6. The touch signal transmission circuit for a touch control display as defined in claim 5, wherein said upper substrate of said LCD further comprises a color filter disposed at an inner side thereof, said color filter having a plurality of filter units and a black matrix, said black matrix having a plurality of first-direction first masking elements and a plurality of second-direction second masking elements, said first masking elements covering all of said first-direction portions located in said touch control section, said first masking elements jointly constituting said insulative layer, said second masking elements covering all of said second-direction electrodes of said first and second patterned electrode layers.

7. The touch signal transmission circuit for a touch control display as defined in claim 6, wherein said first masking elements further cover all of said first-direction electrodes of said second patterned electrode layer located in said touch control section.

8. The touch signal transmission circuit for a touch control display as defined in claim 3, wherein said insulative layer is made of transparent material.