Touchscreen panel with heating function

Patent metadata

Field	Value
Publication number	US-10474289-B2
Application number	US-201615093019-A
Country	US
Kind code	B2
Filing date	Apr 7, 2016
Priority date	Apr 7, 2016
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A touchscreen panel is configured to accept an input touch command. The touchscreen panel includes a liquid crystal display (LCD) layer. The touchscreen panel also includes a touch sensor having a receiving element and a transmitting element, each arranged on the LCD layer. The receiving element and the transmitting element together are configured to detect an impending touch of the touch sensor via a hover system and a touch event in a touch-detecting mode. At least one of the receiving element and the transmitting element is configured to operate in a heating mode, as a heating element, when the impending touch of the touch sensor is not detected. The resultant heating element generates a heat energy input to the LCD layer and accelerates responsiveness of the LCD layer to the touch event. A method of controlling a touchscreen panel is also disclosed.

First claim

The invention claimed is:

1. A touchscreen panel for accepting an input touch command, comprising:
a liquid crystal display (LCD) layer;
a touch sensor including a receiving element and a transmitting element, each arranged on the LCD layer; and
a conducting element arranged on the LCD layer, having multiple electric connections to each of the receiving element and the transmitting element along the receiving and transmitting elements' respective lengths, and configured to deliver electrical current to each of the receiving and transmitting elements;
wherein:
the receiving element and the transmitting element together are configured to establish mutual capacitance therebetween to thereby detect an impending touch of the touch sensor via a hover system and a touch event in a touch-detecting mode; and
at least one of the receiving element and the transmitting element is configured to operate as a heating element by generating a heat energy input to the LCD layer in a heating mode and accelerate responsiveness of the LCD layer to the touch event when the impending touch of the touch sensor is not detected.

2. The touchscreen panel according to claim 1 , further comprising a temperature sensor arranged on the touch sensor and configured to detect a temperature of the LCD layer, and wherein the heating element is additionally configured to generate the heat energy input to the touch sensor in the heating mode when the detected temperature of the LCD layer is below a predetermined value.

3. The touchscreen panel according to claim 2 , wherein the touch sensor is additionally configured to switch from the heating mode to the touch-detecting mode, if the impending touch of the touch sensor is detected or the temperature of the LCD layer is at or above the predetermined value.

4. The touchscreen panel according to claim 3 , further comprising a conducting element, wherein the touch sensor is in electric communication, via the conducting element, with a power management integrated circuit (PMIC) configured to receive the electrical current from a power supply and regulate the voltage across the heating element to generate the heat energy input to the LCD layer.

5. The touchscreen panel according to claim 4 , wherein the PMIC is configured to selectively switch the heating element on in response to the detected temperature of the LCD layer being lower than the predetermined value and switch the heating element off in response to the detected temperature of the LCD layer being at or above the predetermined value.

6. The touchscreen panel according to claim 5 , wherein the PMIC is configured to modulate the voltage across the heating element progressively in response to the detected temperature of the LCD layer.

7. The touchscreen panel according to claim 4 , wherein the conducting element is one of a wire connection, a trace, and an impression to the LCD layer, and is configured to establish a switchable electric connection of at least one of the receiving element and the transmitting element with the PMIC.

8. The touchscreen panel according to claim 1 , wherein the touchscreen panel is a control and a display panel for an infotainment system integrated into a vehicle.

9. The touchscreen panel according to claim 1 , wherein each of the receiving element and the transmitting element is configured as an electrode and includes an electrode portion shaped to loop and double back on the LCD layer; and wherein the electrode portion of the receiving element shaped to loop and double back is configured to complement the electrode portion of the transmitting element shaped to loop and double back, such that the receiving element nests within the transmitting element.

10. The touchscreen panel according to claim 1 , wherein solely the receiving element or solely the transmitting element is configured to operate as a heating element.

11. An information processing system comprising:
a touchscreen panel having:
a liquid crystal display (LCD) layer;
a touch sensor having a receiving element and a transmitting element, each arranged on the LCD layer and together configured to establish mutual capacitance therebetween to thereby detect an impending touch of the touch sensor via a hover system and a touch event in a touch-detecting mode;
a conducting element arranged on the LCD layer, having multiple electric connections to each of the receiving element and the transmitting element along the receiving and transmitting elements' respective lengths, and configured to deliver electrical current to each of the receiving and transmitting elements; and
a temperature sensor arranged on the touch sensor and configured to detect a temperature of the LCD layer;
wherein at least one of the receiving element and the transmitting element is in operative communication with the temperature sensor and configured to operate as a heating element by generating a heat energy input to the LCD layer in a heating mode when the impending touch of the touch sensor is not detected and the detected temperature of the LCD layer is below a predetermined value; and

a power management integrated circuit (PMIC) configured to:
regulate the voltage across the heating element;
switch the touch sensor from the touch-detecting mode to a heating mode, if the impending touch of the touch sensor is not detected and the detected temperature of the LCD layer is below a predetermined value; and
apply, in the heating mode, a voltage across the heating element to thereby generate the heat energy input to the LCD layer and accelerate responsiveness of the LCD layer to the touch event.

12. The information processing system according to claim 11 , further comprising a controller in electronic communication with the touchscreen panel and configured to:
receive a signal from the temperature sensor indicative of the detected temperature of the LCD layer;
receive a signal from the hover system indicative of the impending touch of the touchscreen; and
regulate the PMIC in response to the received signals from the temperature sensor and the hover system.

13. The information processing system according to claim 11 , wherein the PMIC is additionally configured to switch the touchscreen from the heating mode to the touch-detecting mode, if the impending touch of the touchscreen was detected or the detected temperature of the touchscreen is at or above the predetermined value.

14. The information processing system according to claim 11 , wherein the PMIC is configured to selectively switch the heating element on in response to the detected temperature of the LCD layer being lower than the predetermined value and switch the heating element off in response to the detected temperature of the LCD layer being at or above the predetermined value.

15. The information processing system according to claim 14 , wherein the PMIC is configured to modulate the voltage across the heating element progressively in response to the detected temperature of the LCD layer.

16. The information processing system according to claim 11 , wherein the information processing system is an infotainment system integrated into a vehicle and the touchscreen is a control and a display panel therefor.

17. A method of controlling a touchscreen panel having a liquid crystal display (LCD) layer, the method comprising:
detecting a temperature of the LCD layer via a temperature sensor, wherein the touchscreen panel includes a touch sensor having a receiving element and a transmitting element, each arranged on the LCD layer, together configured to establish mutual capacitance therebetween

Assignees

• Gm Global Tech Operations Llc

Inventors

• Seder Thomas A
• Carpenter James A
• Conway William E
• Ramsey Reno V
• Silvestri Davide
• Degener George

Classifications

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G02F1/133382

  Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell · CPC title

• G06F2203/04108

  Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction · CPC title

• G02F1/132

  Thermal activation of liquid crystals exhibiting a thermo-optic effect · CPC title

• G06F3/044

  by capacitive means · CPC title