EMBEDDED TOUCH SCREEN DISPLAY PANEL DRIVING MECHANISM

• US 20160147348A1
• Filed: 11/18/2015
• Published: 05/26/2016
• Est. Priority Date: 11/21/2014
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: LIU, FENG-HSIANG, LIU, CHIA-LIN
• Granted Patent: US 9,857,902 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally

Abstract

An embedded touch screen display panel driving mechanism includes a number of common electrodes, a number of pixel units each including a pixel electrode, and a number of touch sensing electrodes. The common electrodes can receive a first common voltage to cooperatively induce a first electric field with the pixel electrodes to drive liquid crystals of a liquid crystal layer to rotate to display according to data signals received by the pixel electrodes. The common electrodes can also receive a second common voltage to cooperatively induce a second electric field with the touch sensing electrodes to enable the touch sensing electrodes to transmit touch signals corresponding to touch input on the touch electrodes. At any one time, some common electrodes receive the first common voltage while other common electrodes receive the second common voltage.

Claims

1. An embedded touch screen display panel driving mechanism comprising:

a first substrate;

a plurality of common electrodes arranged in the first substrate, each of the plurality of common electrodes configured to receive one of two types of a common voltage;

a plurality of pixel units each comprising a pixel electrode arranged in the first substrate, the plurality of pixel units arranged in a plurality of pixel groups, each of the plurality of pixel groups corresponding in planar coordinate space to a corresponding one of the plurality of common electrodes and operable in a display mode to drive, upon the corresponding common electrode receiving a first common voltage, liquid crystals of a liquid crystal layer according to corresponding data signals;

a second substrate; and

a plurality of touch sensing electrodes arranged in the second substrate, each of the plurality of touch sensing electrodes comprising a plurality of touch areas, each of the plurality of touch areas corresponding in planar coordinate space to corresponding one of the plurality of pixel units, each of the plurality of pixel groups corresponding in planar coordinate space to corresponding touch areas, and the plurality of touch areas corresponding in planar coordinate space to each pixel group being operable, upon the corresponding common electrodes corresponding in planar coordinate space to the pixel group receiving a second common voltage, in a touch sensing mode to detect touch operations thereon,

wherein the plurality of common electrodes, the corresponding plurality of pixel groups corresponding in planar coordinate space to the plurality of common electrodes, and the corresponding plurality of touch areas corresponding in planar coordinate space to the plurality of pixel groups are divided into a plurality of touch display groups, each of the plurality of touch display groups comprising two or more common electrodes, the corresponding two or more pixel groups, and the corresponding plurality of touch areas of the touch sensing electrodes corresponding in planar coordinate space to the two or more pixel groups;

wherein each of the plurality of touch display groups is operable in a first operation mode, a second operation mode, and a standby mode, the first operation mode being all of the pixel groups of the touch display group operating in the display mode, the second operation mode being all of the touch areas of the touch display group operating in the touch sensing mode, and the standby mode being all of the pixel groups of the touch display group not operating in the display mode and all of the touch areas of the touch display group not operating in the touch sensing mode;

wherein the plurality of touch display groups is configured to operate in the first operation mode one at a time according to a first predetermined sequence, and the plurality of touch display groups is configured to operate in the second operation mode one at a time according to a second predetermined sequence;

wherein the first predetermined sequence and the second predetermined sequence each comprise a plurality of time periods; and

wherein when the first predetermined sequence and the second predetermined sequence control the same touch display group to operate in the first operation mode and the second operation mode during a same time period, the touch display group first operates in the second operation mode, and then the touch display group operates in the first operation mode during a next time period of the first predetermined sequence and the second predetermined sequence.

2. The embedded touch screen display panel driving mechanism as in claim 1, wherein:

the first substrate is an array substrate;

the second substrate is a color film substrate;

the liquid crystal layer is located between the first substrate and the second substrate;

the first substrate further comprises a first base layer, a pixel electrode layer, an insulating layer, and a common electrode layer;

the pixel electrode layer contains the plurality of pixel electrodes and is arranged on the first base layer;

the insulating layer is arranged on the pixel electrode layer;

the common electrode layer contains the plurality of common electrodes and is arranged on the insulating layer;

the common electrode layer is arranged between the liquid crystal layer and the insulating layer;

the second substrate further comprises a second base layer and a touch sensing electrode layer;

the touch sensing electrode layer contains the plurality of touch sensing electrodes and is arranged on the second base layer; and

the touch sensing electrode layer is located between the second base layer and the liquid crystal layer.

3. The embedded touch screen display panel driving mechanism as in claim 1, wherein:

the first common voltage is a direct current voltage; and

the second common voltage is an alternating current voltage.

4. The embedded touch screen display panel driving mechanism as in claim 1, wherein:

each pixel unit is composed of at least a corresponding pixel electrode and a corresponding transistor;

a gate electrode of the transistor is electrically coupled to a corresponding scan line to receive a scan signal;

a source electrode of the transistor is electrically coupled to a corresponding data line to receive a data signal;

a drain electrode of the transistor is electrically coupled to the pixel electrode to relay the data signal to the pixel electrode;

each common electrode is electrically coupled to a corresponding common voltage line to receive either the first common voltage or the second common voltage;

each touch sensing electrode is electrically coupled to a corresponding touch signal line to transmit touch signals according to the touch input applied on the touch areas;

each common electrode, upon receiving the first common voltage and according to the data signals received by the corresponding pixel electrodes, cooperatively induces a first electric field with the corresponding pixel electrodes of the corresponding pixel group to drive corresponding liquid crystals of the liquid crystal layer to rotate to display according to the data signals; and

each common electrode, upon receiving the second common voltage, cooperatively induces a second electric field with the corresponding touch areas corresponding in planar coordinate space to the corresponding pixel group to enable the corresponding touch areas to transmit the touch signals.

5. The embedded touch screen display panel driving mechanism as in claim 4, wherein:

the plurality of pixel units is arranged in a plurality of rows and a plurality of columns;

each row of pixel units constitutes one corresponding pixel group;

each common electrode and the corresponding row of pixel units extend along a first direction;

each touch sensing electrode corresponds in planar coordinate space to one corresponding column of pixel units; and

each touch sensing electrode and the corresponding column of pixel units extend along a second direction perpendicular to the first direction.

6. The embedded touch screen display panel driving mechanism as in claim 5, wherein the embedded touch screen display panel further comprises:

a scan driver configured to transmit the scan signals along the corresponding scan lines, each scan line configured to transmit the scan signals to one corresponding row of pixel units;

a data driver configured to transmit the data signals along the corresponding data lines, each data line configured to transmit the data signals to one corresponding column of pixel units, and the data signals being transmitted to the rows of pixel units that are activated by the scan signals;

a touch sensing driver configured to receive the touch signals transmitted along the corresponding touch signal lines and determine a coordinate point of the touch signals;

a common voltage circuit configured to transmit the first and second common voltages along the corresponding common voltage lines; and

a timing controller configured to control, according to a planar synchronization signal, the scan driver to transmit the scan signals, the data driver to transmit the data signals, the touch sensing driver to receive the touch signals, and the common voltage circuit to transmit either the first common voltage or the second common voltage.

7. The embedded touch screen display panel driving mechanism as in claim 6, wherein:

the first predetermined sequence and the second predetermined sequence are controlled according to the planar synchronization signal;

the timing controller transmits the data signals to the data driver to transmit to the pixel units;

the timing controller transmits, according to the planar synchronization signal, a gate control signal, a source control signal, a common voltage control signal, and a touch control signal to the scan driver, the data driver, the common voltage circuit, and the touch sensing driver, respectively;

the scan driver transmits the scan signals upon receiving the gate control signal;

the data driver transmits the data signals upon receiving the source control signal;

the common voltage circuit transmits the first common voltage or the second common voltage upon receiving and according to the common voltage control signal; and

the touch sensing driver receives the touch signals upon receiving the touch control signal.

8. The embedded touch screen display panel driving mechanism as in claim 7, wherein:

the common voltage circuit comprises a common voltage supply driver and a control driver;

the common voltage supply driver is configured to output the first common voltage and the second common voltage; and

the control driver is configured to control the common voltage supply driver to output the first common voltage and the second common voltage.

9. The embedded touch screen display panel driving mechanism as in claim 8, wherein a frequency of the first predetermined sequence is different from a frequency of the second predetermined sequence.

10. The embedded touch screen display panel driving mechanism as in claim 9, wherein a direction of progression of the first predetermined sequence is the same as a direction of progression of the second predetermined sequence.

11. The embedded touch screen display panel driving mechanism as in claim 10, wherein:

the first predetermined sequence starts from a first touch display group, continues toward a last touch display group, and ends on the last touch display group;

the second predetermined sequence starts from a second touch display group, continues toward the last touch display group, and ends on the first touch display group;

the frequency of the second predetermined sequence is twice as fast as the frequency of the first predetermined sequence;

a time duration of each touch display group operating in the first operation mode is twice as long as a time duration of each touch display group operating in the second operation mode;

a time duration of each touch display group operating in the first operation mode is equal to a length of any one time period; and

a time duration of each touch display group operating in the second operation mode is equal to a length of half of any one time period.

12. The embedded touch screen display panel driving mechanism as in claim 8, wherein a frequency of the first predetermined sequence is the same as a frequency of the second predetermined sequence.

13. The embedded touch screen display panel driving mechanism as in claim 12, wherein a direction of progression of the first predetermined sequence is different from a direction of progression of the second predetermined sequence.

14. The embedded touch screen display panel driving mechanism as in claim 13, wherein:

the first predetermined sequence starts from a first touch display group, continues toward a last touch display group, and ends on the last touch display group;

the second predetermined sequence starts from the last touch display group, continues toward the first touch display group, and ends on the first touch display group;

a time duration of each touch display group operating in the first operation mode is the same as a time duration of each touch display group operating in the second operation mode; and

a time duration of each touch display group operating in the first operation mode and the second operation mode is equal to a length of any one time period.