Touch display device

Patent metadata

Field	Value
Publication number	US-12105914-B2
Application number	US-202217830438-A
Country	US
Kind code	B2
Filing date	Jun 2, 2022
Priority date	Mar 16, 2022
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

A touch detection method includes the following steps: (1). providing a touch display device, wherein the touch display device includes a plurality of LED units and a plurality of switches, each LED unit includes a LED and a photo sensor, and the switches are electrically coupled to the LED units; and (2). enabling the LED and a photo sensor coupled to the conductive one non-simultaneously during a conductive period of a conductive one of the switches. As a result, an influence of a touch detection of the photo sensor by a light emission of the LED could be reduced.

First claim

What is claimed is:

1. A touch display device, comprising:
a plurality of Light-Emitting Diode (LED) units each comprising:
a LED; and
a photo sensor; and

a plurality of switches electrically coupled to the LED units;
wherein during a conductive period of a conductive one of the switches, the LED and the photo sensor which are coupled to the conductive one are enabled non-simultaneously;
wherein the touch display device further comprises:
a plurality of scan line groups each extending in a first axis, wherein the scan line groups are arranged in a second axis;
wherein each switch is electrically coupled to the LED units which are arranged in the second axis;
wherein each scan line group is electrically coupled to the LED units which are arranged in the first axis;
wherein the touch display device further comprises:
a plurality of first switch groups electrically coupled to the scan line groups;
wherein the first switch groups are turned on in sequence, and when one of the first switch groups is turned on, the others of the first switch groups are turned off.

2. The touch display device according to claim 1 , further comprising:
a plurality of scan lines each extending in the first axis, wherein the scan lines are arranged in the second axis, and each scan line is electrically coupled to a corresponding plurality of the photo sensors arranged in the first axis;
wherein each switch is electrically coupled to the photo sensors arranged in the second axis.

3. The touch display device according to claim 2 , further comprising:
a plurality of second switches electrically coupled to the scan lines;
wherein the second switches are turned on in sequence, and when one of a plurality of the first switch groups is turned on, the others of the first switch groups are turned off.

4. The touch display device of claim 1 , wherein when the photo sensor of one of the LED units is enabled, the LEDs of the LED units surrounding the one of the LED units are disabled.

5. The touch display device according to claim 1 , comprising:
A1×B1 LED modules, wherein A1 and B1 are positive integers greater than 1, and each LED module comprises:
a circuit board; and
M1×N1 LED units are disposed on the circuit board, wherein the (m1×n1) th LED unit has a first address [m1,n1], wherein M1 and N1 are positive integers greater than 1, m1 is positive integer ranging between 1 to M1, and n1 is positive integer ranging between 1 to N1;

wherein the touch display device further comprises a control unit, and the control unit is configured for:
in response to a touch signal of the (m1×n1) th LED unit of the (a1×b1) th LED module, the first address [m1,n1] of the (m1×n1) th LED unit is converted into a second address [((a1−1)×M1+m1),((b1−1)×N1+n1)], wherein a1 is positive integer ranging between 1 to A1, and b1 is positive integer ranging between 1 to B1.

6. The touch display device of claim 1 , wherein each LED unit is a semiconductor package.

7. A touch detection method, comprising:
providing a touch display device, wherein the touch display device comprises a plurality of LED units, a plurality of switches and a plurality of scan line groups, wherein each LED unit comprises a LED and a photo sensor, the switches are electrically coupled to the LED units, each scan line group extends in a first axis, the scan line groups are arranged in a second axis, and each switch is electrically coupled to the LED units which are arranged in the second axis; and
enabling the LED and the photo sensor which are coupled to a conductive one non-simultaneously during a conductive period of the conductive one of the switches;
wherein the touch display device further comprises: a plurality of scan lines each extending in the first axis, wherein the scan lines are arranged in the second axis, and each scan line is electrically coupled to a corresponding plurality of the photo sensors arranged in the first axis; wherein each switch is electrically coupled to the photo sensors arranged in the second axis; the touch display device further comprises a plurality of second switches electrically coupled to the scan lines, and the touch detection method further comprises:
turning on one of the second switches and turning off the others of the second switches.

8. The touch detection method according to claim 7 , further comprising:
enabling the photo sensor of one of the LED units and disabling the LEDs of the LED units surrounding the one of the LED units.

9. The touch detection method according to claim 7 , wherein the touch display device further comprises A1×B1 LED modules, A1 and B1 are positive integers greater than 1, each LED module comprises a circuit board and M1×N1 the LED units disposed on the circuit board, the (m1×n1) th LED unit has a first address [m1,n1], M1 and N1 are positive integers greater than 1, m1 is positive integer ranging between 1 to M1, and n1 is positive integer ranging between 1 to N1; the touch detection methods further comprises:
in response to a touch signal of the (m1×n1) th LED unit of the (a1×b1) th LED module, converting the first address [m1,n1] of the (m1×n1) th LED unit into a second address [((a1−1)×M1+m1),((b1−1)×N1+n1)], wherein a1 is positive integer ranging between 1 to A1, and b1 is positive integer ranging between 1 to B1.

10. A touch display device, comprising:
a plurality of LED units each comprising:
a LED; and
a photo sensor; and

a plurality of switches electrically coupled to the LED units;
wherein during a conductive period of a conductive one of the switches, the LED and the photo sensor which are coupled to the conductive one are enabled non-simultaneously;
wherein the touch display device further comprises:
a plurality of scan line groups each extending in a first axis, wherein the scan line groups are arranged in a second axis;
wherein each switch is electrically coupled to the LED units which are arranged in the second axis;
wherein the touch display device further comprises:
a plurality of scan lines each extending in the first axis, wherein the scan lines are arranged in the second axis, and each scan line is electrically coupled to a corresponding plurality of the photo sensors arranged in the first axis;

wherein each switch is electrically coupled to the photo sensors arranged in the second axis.

Assignees

• Qisda Corp

Inventors

• Chang Chih-Ming

Classifications

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/042

  by opto-electronic means · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/04184 Primary

  Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally · CPC title