SUBSTRATE WITH TOUCH FUNCTION AND DISPLAY USING THE SAME

• US 20150062076A1
• Filed: 08/11/2014
• Published: 03/05/2015
• Est. Priority Date: 08/28/2013
• Status: Active Grant

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: PAN, HSIN-YU, LIEN, CHUNG-MIN, CHEN, HAN-MING
• Granted Patent: US 9,547,398 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• 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 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: G09G 2310/0264 Details of driving circuits
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers

Abstract

A substrate with touch function includes a plurality of scan lines and at least a touch device disposed thereon. The touch device includes at least a power line, at least a readout line, a light sensing circuit and a voltage divider circuit. The power line and the readout line are disposed on the substrate. The light sensing circuit is electrically coupled to a (N+1)th of the power lines, an Nth of the scan lines and an Nth of the readout lines, wherein N is an integer. The voltage divider circuit has an output terminal and is configured to output a first voltage to the light sensing circuit through the output terminal thereof according to a degree of illumination thereon or a degree of capacitance change. A display using the aforementioned substrate is also provided.

Claims

1. A substrate with touch function, comprising:

a plurality of scan lines disposed on the substrate;

at least a touch device disposed on the substrate, the touch device comprising;

at least a power line disposed on the substrate;

at least a readout line disposed on the substrate;

a light sensing circuit electrically coupled to a (N+1)th of the power lines, a Nth of the scan lines and a Nth of the readout lines, wherein N is an integer; and

a voltage divider circuit comprising an output terminal and configured to output a voltage to the light sensing circuit through the output terminal thereof according to a degree of illumination thereon or a degree of capacitance change.

2. The substrate according to claim 1, wherein the voltage divider circuit comprises:

a light sensing transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to the second communication terminal, the first communication terminal is electrically coupled to a (N+2)th of the scan lines, and the second communication terminal is electrically coupled to the output terminal of the voltage divider circuit and for outputting the voltage; and

a reference transistor comprising a second control terminal, a third communication terminal and a fourth communication terminal, wherein the second control terminal is electrically coupled to the fourth communication terminal, the third communication terminal is electrically coupled to the second communication terminal, and the fourth communication terminal is electrically coupled to a predetermined voltage,

wherein the (N+2)th of the scan lines is arranged next to the Nth of the scan lines.

3. The substrate according to claim 1, wherein the voltage divider circuit comprises:

a light sensing diode comprising an anode terminal and a cathode terminal, wherein the anode terminal is electrically coupled to a reverse bias, and the cathode terminal is electrically coupled to the output terminal of the voltage divider circuit and for outputting the voltage.

4. The substrate according to claim 1, wherein the voltage divider circuit comprises:

a first capacitor electrically coupled between the output terminal of the voltage divider circuit and a first predetermined voltage; and

a second capacitor electrically coupled between the output terminal of the voltage divider circuit and a second predetermined voltage,

wherein the first predetermined voltage is greater than the second predetermined voltage, and the voltage divider circuit is configured to output a corresponding degree of the voltage according to a degree of capacitance change of the first capacitor.

5. The substrate according to claim 1, wherein the voltage divider circuit comprises:

a light sensing transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to a (N+1)th of the scan lines, the first communication terminal is electrically coupled to the output terminal of the voltage divider circuit, and the second communication terminal is for receiving an inverse signal of a scan signal on the (N+1)th of the scan lines; and

a capacitor electrically coupled between the first communication terminal and a constant voltage,

wherein the (N+1)th of the scan lines is arrange next to the Nth of the scan lines.

6. The substrate according to claim 1, wherein the light sensing circuit comprises:

a readout transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to the Nth of the scan lines, and the first communication terminal is electrically coupled to the Nth of the readout lines;

a light sensing transistor comprising a second control terminal, a third communication terminal and a fourth communication terminal, wherein the second control terminal is electrically coupled to the output terminal of the voltage divider circuit and for receiving the voltage, the third communication terminal is electrically coupled to the second communication terminal, and the fourth communication terminal is electrically coupled to the (N+1)th of the power lines;

a first capacitor electrically coupled between the second communication terminal and a constant voltage; and

a second capacitor electrically coupled between the second control terminal and the fourth communication terminal.

7. The substrate according to claim 1, wherein the light sensing circuit comprises:

a readout transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to the Nth of the scan lines, and the first communication terminal is electrically coupled to the Nth of the readout lines;

a first light sensing transistor comprising a second control terminal, a third communication terminal and a fourth communication terminal, wherein the second control terminal is electrically coupled to a (N+1)th of the scan lines, and the third communication terminal is electrically coupled to the second communication terminal;

a second light sensing transistor comprising a third control terminal, a fifth communication terminal and a sixth communication terminal, wherein the third control terminal is electrically coupled to the output terminal of the voltage divider circuit and for receiving the voltage, the fifth communication terminal is electrically coupled to the fourth communication terminal, and the sixth communication terminal is electrically coupled to the (N+1)th of the power lines.

a first capacitor electrically coupled between the third communication terminal and a constant voltage; and

a second capacitor electrically coupled between the third control terminal and the sixth communication terminal,

wherein the (N+1)th of the scan lines is arranged next to the Nth of the scan lines.

8. The substrate according to claim 1, wherein the light sensing circuit comprises:

a readout transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to the Nth of the scan lines, and the first communication terminal is electrically coupled to the Nth of the readout lines;

a light sensing transistor comprising a second control terminal, a third communication terminal and a fourth communication terminal, wherein the second control terminal is electrically coupled to the output terminal of the voltage divider circuit and for receiving the first voltage, the third communication terminal is electrically coupled to the second communication terminal, and the fourth communication terminal is electrically coupled to the (N+1)th of the power lines; and

a capacitor electrically coupled between the second communication terminal and a constant voltage.

9. The substrate according to claim 1, wherein the light sensing circuit comprises:

a readout transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to the Nth of the scan lines, and the first communication terminal is electrically coupled to the Nth of the readout lines;

a light sensing transistor comprising a second control terminal, a third communication terminal and a fourth communication terminal, wherein the second control terminal is electrically coupled to the output terminal of the voltage divider circuit and for receiving the voltage, the third communication terminal is electrically coupled to the second communication terminal, and the fourth communication terminal is electrically coupled to the (N+1)th of the power lines;

a reset transistor comprising a third control terminal, a fifth communication terminal and a sixth communication terminal, wherein the third control terminal is electrically coupled to a (N+1)th of the scan lines, the fifth communication terminal is electrically coupled to the second communication terminal, and the sixth communication terminal is electrically coupled to the (N+1)th of the power lines; and

a capacitor electrically coupled between the second communication terminal and a constant voltage.

10. A display with touch function, comprising:

a first substrate comprising;

a plurality of scan lines disposed on a first side of the first substrate;

at least a touch device disposed on the first side of first substrate, the touch device comprising;

at least a power line disposed on the first side of first substrate;

at least a readout line disposed on the first side of first substrate;

a light sensing circuit electrically coupled to a (N+1)th of the power lines, a Nth of the scan lines and a Nth of the readout lines, wherein N is an integer; and

a voltage divider circuit comprising an output terminal and configured to output a voltage to the light sensing circuit through the output terminal thereof according to a degree of illumination thereon or a degree of capacitance change;

a second substrate disposed on a second side of the first substrate; and

a liquid crystal layer disposed between the first substrate and the second substrate.

11. The display according to claim 10, wherein the voltage divider circuit comprises:

a light sensing transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to the second communication terminal, the first communication terminal is electrically coupled to a (N+2)th of the scan lines, and the second communication terminal is electrically coupled to the output terminal of the voltage divider circuit and for outputting the voltage; and

a reference transistor comprising a second control terminal, a third communication terminal and a fourth communication terminal, wherein the second control terminal is electrically coupled to the fourth communication terminal, the third communication terminal is electrically coupled to the second communication terminal, and the fourth communication terminal is electrically coupled to a predetermined voltage,

wherein the (N+2)th of the scan lines is arranged next to the Nth of the scan lines.

12. The display according to claim 10, wherein the voltage divider circuit comprises:

a light sensing diode comprising an anode terminal and a cathode terminal, wherein the anode terminal is electrically coupled to a reverse bias, and the cathode terminal is electrically coupled to the output terminal of the voltage divider circuit and for outputting the voltage.

13. The display according to claim 10, wherein the voltage divider circuit comprises:

a first capacitor electrically coupled between the output terminal of the voltage divider circuit and a first predetermined voltage; and

a second capacitor electrically coupled between the output terminal of the voltage divider circuit and a second predetermined voltage,

wherein the first predetermined voltage is greater than the second predetermined voltage, and the voltage divider circuit is configured to output a corresponding degree of the voltage according to a degree of capacitance change of the first capacitor.

14. The display according to claim 10, wherein the voltage divider circuit comprises:

a light sensing transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to a (N+1)th of the scan lines, the first communication terminal is electrically coupled to the output terminal of the voltage divider circuit, and the second communication terminal is for receiving an inverse signal of a scan signal on the (N+1)th of the scan lines; and

a capacitor electrically coupled between the first communication terminal and a constant voltage,

wherein the (N+1)th of the scan lines is arrange next to the Nth of the scan lines.

15. The display according to claim 10, wherein the light sensing circuit comprises:

a readout transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to the Nth of the scan lines, and the first communication terminal is electrically coupled to the Nth of the readout lines;

a light sensing transistor comprising a second control terminal, a third communication terminal and a fourth communication terminal, wherein the second control terminal is electrically coupled to the output terminal of the voltage divider circuit and for receiving the voltage, the third communication terminal is electrically coupled to the second communication terminal, and the fourth communication terminal is electrically coupled to the (N+1)th of the power lines;

a first capacitor electrically coupled between the second communication terminal and a constant voltage; and

a second capacitor electrically coupled between the second control terminal and the fourth communication terminal.

16. The display according to claim 10, wherein the light sensing circuit comprises:

a readout transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to the Nth of the scan lines, and the first communication terminal is electrically coupled to the Nth of the readout lines;

a first light sensing transistor comprising a second control terminal, a third communication terminal and a fourth communication terminal, wherein the second control terminal is electrically coupled to a (N+1)th of the scan lines, and the third communication terminal is electrically coupled to the second communication terminal;

a second light sensing transistor comprising a third control terminal, a fifth communication terminal and a sixth communication terminal, wherein the third control terminal is electrically coupled to the output terminal of the voltage divider circuit and for receiving the voltage, the fifth communication terminal is electrically coupled to the fourth communication terminal, and the sixth communication terminal is electrically coupled to the (N+1)th of the power lines.

a first capacitor electrically coupled between the third communication terminal and a constant voltage; and

a second capacitor electrically coupled between the third control terminal and the sixth communication terminal,

wherein the (N+1)th of the scan lines is arranged next to the Nth of the scan lines.

17. The display according to claim 10, wherein the light sensing circuit comprises:

a readout transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to the Nth of the scan lines, and the first communication terminal is electrically coupled to the Nth of the readout lines;

a light sensing transistor comprising a second control terminal, a third communication terminal and a fourth communication terminal, wherein the second control terminal is electrically coupled to the output terminal of the voltage divider circuit and for receiving the voltage, the third communication terminal is electrically coupled to the second communication terminal, and the fourth communication terminal is electrically coupled to the (N+1)th of the power lines; and

a capacitor electrically coupled between the second communication terminal and a constant voltage.

18. The display according to claim 10, wherein the light sensing circuit comprises:

a readout transistor comprising a first control terminal, a first communication terminal and a second communication terminal, wherein the first control terminal is electrically coupled to the Nth of the scan lines, and the first communication terminal is electrically coupled to the Nth of the readout lines;

a light sensing transistor comprising a second control terminal, a third communication terminal and a fourth communication terminal, wherein the second control terminal is electrically coupled to the output terminal of the voltage divider circuit and for receiving the voltage, the third communication terminal is electrically coupled to the second communication terminal, and the fourth communication terminal is electrically coupled to the (N+1)th of the power lines;

a reset transistor comprising a third control terminal, a fifth communication terminal and a sixth communication terminal, wherein the third control terminal is electrically coupled to a (N+1)th of the scan lines, the fifth communication terminal is electrically coupled to the second communication terminal, and the sixth communication terminal is electrically coupled to the (N+1)th of the power lines; and

a capacitor electrically coupled between the second communication terminal and a constant voltage.

19. The display according to claim 10, further comprising:

a plurality of data lines disposed on the first side of the first substrate, wherein the data lines and the scan lines are arranged in an intersecting manner and thereby a plurality of pixel areas are defined on the display;

a plurality of pixel transistors disposed in the pixel areas and electrically coupled to scan lines and the data lines, respectively; and

a plurality of pixel electrodes disposed in the pixel areas and electrically coupled to the pixel transistors, respectively.

20. The display according to claim 19, wherein the light sensing device is disposed in one of the pixel areas.