TOUCH PANEL AND ELECTRONIC DEVICE USING SAME

• US 20110157075A1
• Filed: 09/17/2010
• Published: 06/30/2011
• Est. Priority Date: 12/31/2009
• Status: Abandoned Application

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: YANG, SONG-LING
• Application Number:
  US12/884,203
• Publication Number:
  US 20110157075A1
• 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

Abstract

An electronic device is provided. The electronic device includes a touch panel. The touch panel includes touch units, an oscillator, rectifier circuits, a direct current power, switches, and comparators. Each touch unit includes an upper electrode layer, a lower electrode layer, a liquid crystal layer, and an emitting layer. The oscillator is configured to output a high-frequency current to the upper electrode layers. Each rectifier circuit is configured to convert the high-frequency current to the direct current. Each comparator is configured to determine whether the direct current is less than a reference current. When the touch panel is touched, the high-frequency current deceases. The direct current deceases. The comparator outputs a control signal to turn on the switch. The direct current power supplies electricity to control the liquid crystal molecules to be arranged in order, the light emitted from the emitting layer thus passes through the liquid crystal layer.

Claims

1. A touch panel comprising:

a plurality of touch units, each of which comprises an upper electrode layer, a lower electrode layer, a liquid crystal layer arranged between the upper electrode layer and the lower electrode layer, and an emitting layer arranged on the bottom of the lower electrode layer;

a high-frequency current oscillator connected to the upper electrode layers of the touch units and configured to output high-frequency current to the upper electrode layers;

a plurality of rectifier circuits, each of which corresponds to one of the touch units, and is electrically connected to the upper electrode layer of the corresponding touch unit and is configured to convert the high-frequency current output by the upper electrode layer of the corresponding touch unit to direct current;

a direct current power, configured to supply electricity to the upper electrode layer and the lower electrode layer of each touch unit;

a plurality of switches, each of which corresponds to one of the touch units and connected between the corresponding touch unit and the direct current power; and

a plurality of comparators, each of which corresponds to one of the touch units and comprises an input port connected to a corresponding one of the rectifier circuits, an output port connected to a corresponding one of the switches, and a reference current port, a reference current equal to the high-frequency current output from the high-frequency current oscillator flowing to the reference current port, and is configured to determine whether the direct current converted by the rectifier circuit connected to the comparator is less than the reference current flowing to the comparator, and output control signals to turn on or turn off the corresponding switch connected to the comparator according to comparing result;

wherein, when a spot of the touch panel is touched, high-frequency the current flows to the upper electrode layer of the touch unit corresponding to the touched position decreases, the direct current converted by the rectifier circuit corresponding to the touch unit decreases, and the comparator outputs control signals to turn on the switch, the direct current power supplies electricity to the touch unit to control the liquid crystal molecules of the liquid crystal layer to be arranged in order, the light emitted from the emitting layer of the touch unit thus passes through the liquid crystal layer of the touch unit.

2. The touch panel as described in claim 1, wherein each of the switches is electrically connected among the output port of the corresponding comparator, the corresponding lower electrode layer, and the direct current power.

3. The touch panel as described in claim 1, wherein each of the switches is electrically connected among the output port of the corresponding one of the comparators, the corresponding one of the upper electrode layers, and the direct current power.

4. The touch panel as described in claim 1, wherein each of the upper electrode layers and each of the lower electrode layers are transparent.

5. The touch panel as described in claim 1, further comprising a protecting layer arranged on each of the upper electrode layers, wherein the protecting layer is made of transparent and conductive material.

6. An electronic device comprising:

a touch panel comprising,

a plurality of touch units, each of which comprises an upper electrode layer, a lower electrode layer, a liquid crystal layer arranged between the upper electrode layer and the lower electrode layer, and an emitting layer arranged on the bottom of the lower electrode layer;

a high-frequency current oscillator electrically connected to the upper electrode layers of the touch units and configured to output high-frequency current to the upper electrode layers;

a plurality of rectifier circuits, each of which corresponds to one of the touch units and is electrically connected to the upper electrode layer of the corresponding touch unit and is configured to convert the high-frequency current output by the upper electrode layer of the corresponding touch unit to direct current;

a direct current power, configured to supply electricity to the upper electrode layer and the lower electrode layer of each touch unit;

a plurality of switches, each of which corresponds to one of the touch units and connected between the corresponding touch unit and the direct current power; and

a plurality of comparators, each of which corresponds to one of the touch units and comprises an input port electrically connected to a corresponding one of the rectifier circuits, an output port electrically connected to a corresponding one of the switches, and a reference current port, a reference current equal to the high-frequency current output from the high-frequency current oscillator flowing to the reference current port, and is configured to determine whether the direct current converted by the rectifier circuit connected to the comparator is less than the reference current flowing to the comparator, and output control signals to turn on or turn off the corresponding switch electrically connected to the comparator according to comparing result;

wherein, when a spot of the touch panel is touched, the high-frequency current flows to the upper electrode layer of the touch unit corresponding to the touched position decreases, the direct current converted by the rectifier circuit corresponding to the touch unit decreases, and the comparator outputs control signals to turn on the switch, the direct current power supplies electricity to the touch unit to control the liquid crystal molecules of the liquid crystal layer to be arranged in order, the light emitted from the emitting layer of the touch unit thus passes through the liquid crystal layer of the touch unit.

7. The electronic device as described in claim 6, wherein each of the switches is electrically connected among the output port of the corresponding comparator, the corresponding lower electrode layers, and the direct current power.

8. The electronic device as described in claim 6, wherein each of the switches is electrically connected among the output port of the corresponding comparators, the corresponding upper electrode layers, and the direct current power.

9. The electronic device as described in claim 6, wherein each of the upper electrode layer and each of the lower electrode layer are transparent.

10. The electronic device as described in claim 6, further comprising a protecting layer arranged on the upper electrode layer, the protecting layer is made of transparent and conductive material.