CONTROL DEVICE FOR AN ELECTROLUMINESCENT TOUCH-CONTROL DISPLAY PANEL, TOUCH SCREEN AND DISPLAY DEVICE

• US 20170357363A1
• Filed: 09/05/2016
• Published: 12/14/2017
• Est. Priority Date: 11/20/2015
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Yang, Shengji, Zhang, Boya, Dong, Xue, Meng, Zhaohui, Chen, Xiaochuan, Wang, Haisheng, Sun, Wei, Chen, Dong, Jang, Kwanggyun
• Granted Patent: US 10,139,956 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

A control device for an electroluminescent touch-control display panel is described having a display driving circuit board, a touch-control driving circuit board, a lighting circuit board and a switching circuit board. The lighting circuit board provides a first reference signal to the touch-control driving circuit board. During the display period, the touch-control driving circuit board gates the first reference signal and transmits it to the display driving circuit board which then transmits the first reference signal to a cathode in the touch-control display panel to realize display. During the touch-control period, the touch-control driving circuit board gates an excitation signal and transmits it to the display driving circuit board which then transmits the excitation signal to the cathode and transmits a feedback signal to the touch-control driving circuit board, and the touch-control driving circuit board determines a position of touch control in accordance with the feedback signal.

Claims

1. A control device for an electroluminescent touch-control display panel comprising:

a display driving circuit board electrically connected to the electroluminescent touch-control display panel, a touch-control driving circuit board, a lighting circuit board, and a switching circuit board electrically connected respectively to the display driving circuit board, the touch-control driving circuit board and the lighting circuit board;

wherein,

the lighting circuit board is configured to provide a first reference signal to the touch-control driving circuit board via the switching circuit board;

the touch-control driving circuit board is configured to gate, during the touch-control period, a generated touch-control excitation signal and then transmit the touch-control excitation signal to the display driving circuit board via the switching circuit board, and determine a position of touch control in the electroluminescent touch-control display panel in accordance with a feedback signal transmitted by the display driving circuit board, and gate, during the display period, the first reference signal provided by the lighting circuit board and then transmit the first reference signal to the display driving circuit board via the switching circuit board;

the display driving circuit board is configured to during the touch-control period, transmit the excitation signal, transmitted by the touch-control driving circuit board, to a cathode multiplexed as a touch-control electrode in the electroluminescent touch-control display panel, and transmit a feedback signal received from the cathode multiplexed as the touch-control electrode in the electroluminescent touch-control display panel to the touch control driving circuit board via the switching circuit board, and during the display period, transmit the first reference signal, transmitted by the touch-control driving circuit board, to the cathode multiplexed as the touch-control electrode in the electroluminescent touch-control display panel.

2. The control device according to claim 1, wherein the display driving circuit board comprises a display driving circuit and a first switching circuit;

and the touch-control driving circuit board comprises a first modulation circuit, a first gating circuit, an enable signal generation circuit and a touch-control detection circuit;

wherein,

the display driving circuit is configured to transmit a synchronization signal to the enable signal generation circuit via the switching circuit board;

the enable signal generation circuit is configured to generate a first enable signal and a second enable signal, under the control of the synchronization signal transmitted by the display driving circuit board, transmit the first enable signal to the first gating circuit during the display period, and transmit the second enable signal to the first gating circuit during the touch-control period;

the first modulation circuit is configured to generate a first square-wave signal as a touch-control excitation signal, and transmit the touch-control excitation signal to the first gating circuit;

the first gating circuit is configured to receive the excitation signal and the first reference signal provided by the lighting circuit board, upon receiving the first enable signal, gate the first reference signal and then output the first reference signal to the first switching circuit via the switching circuit board and upon receiving the second enable signal, gate the touch-control excitation signal and then output the touch-control excitation signal to the first switching circuit via the switching circuit board;

the first switching circuit is configured to forward the first reference signal or the touch-control excitation signal received from the first gating circuit to a first reference signal port connected to the cathode in the electroluminescent touch-control display panel, and forward a feedback signal, received from the first reference signal port connected to the cathode in the electroluminescent touch-control display panel, to the touch-control detection circuit via the switching circuit board;

the touch-control detection circuit is configured to determine a position of touch control in the electroluminescent touch-control display panel in accordance with the feedback signal.

3. The control device according to claim 2, wherein the display driving circuit board further comprises, a second switching circuit;

and the touch-control driving circuit board further comprises a second modulation circuit and a second gating circuit;

wherein

the display driving circuit is further configured to transmit a gate driver circuit on array (GOA) signal to the second gating circuit and the second modulation circuit via the switching circuit board;

the enable signal generation circuit is further configured to under the control of the synchronization signal transmitted by the display driving circuit, transmit the first enable signal to the second gating circuit during the display period, and transmit the second enable signal to the second gating circuit during the touch-control period;

the second modulation circuit is configured to generate a second square-wave signal benchmarked against a voltage of the GOA signal in accordance with the GOA signal, and transmit the second square-wave signal to the second gating circuit;

the second gating circuit is configured to receive the GOA signal and the second square-wave signal, and upon receiving the first enable signal, gate the GOA signal and then output the GOA signal to the second switching circuit via the switching circuit board, and upon receiving the second enable signal, gate the second square-wave signal and then output the second square-wave signal to the second switching circuit via the switching circuit board;

the second switching circuit is configured to transmit the received GOA signal or the second square-wave signal to a signal port of a GOA circuit in the electroluminescent touch-control display panel.

4. The control device according to claim 3, wherein an amplitude of the second square-wave signal generated by the second modulation circuit is the same as that of the first square-wave signal generated by the first modulation circuit.

5. The control device according to claim 2, wherein the display driving circuit is further configured to transmit a data signal to a data signal port of a pixel circuit in the electroluminescent touch-control display panel during the display period only.

6. The control device according to claim 5, wherein the enable signal generation circuit is further configured to under the control of the synchronization signal transmitted by the display driving circuit, transmit the first enable signal to the display driving circuit via the switching circuit board during the display period, and transmit the second enable signal to the display driving circuit via the switching circuit board during the touch-control period;

the display driving circuit is configured to upon receiving the first enable signal, transmit the data signal to the data signal port of the pixel circuit in the electroluminescent touch-control display panel, and upon receiving the second enable signal, stop transmitting the data signal to the data signal port of the pixel circuit in the electroluminescent touch-control display panel.

7. The control device according to claim 2, wherein the display driving circuit board further comprises a third switching circuit;

and the touch-control driving circuit board further comprises a third modulation circuit and a third gating circuit;

wherein

the lighting circuit board is further configured to provide a second reference signal to the third gating circuit and the third modulation circuit via the switching circuit board;

the enable signal generation circuit is further configured to under the control of the synchronization signal transmitted by the display driving circuit, transmit the first enable signal to the third gating circuit during the display period, and transmit the second enable signal to the third gating circuit during the touch-control period;

the third modulation circuit is configured to generate a third square-wave signal benchmarked against a voltage of the second reference signal in accordance with the second reference signal, and transmit the third square-wave signal to the third gating circuit;

the third gating circuit is configured to receive the second reference signal and the third square-wave signal, and upon receiving the first enable signal, gate the second reference signal and then output the second reference signal to the third switching circuit via the switching circuit board, and upon receiving the second enable signal, gate the third square-wave signal and then output the third square-wave signal to the third switching circuit via the switching circuit board;

the third switching circuit is configured to transmit the received second reference signal or third square-wave signal, to a second reference signal port of the pixel circuit in the electroluminescent touch-control display panel.

8. The control device according to claim 7, wherein, an amplitude of the third square-wave signal generated by the third modulation circuit is the same as that of the first square-wave signal generated by the first modulation circuit.

9. A touch screen comprising:

an electroluminescent touch-control display panel, and a control circuit device for the electroluminescent touch-control display panel according to claim 1 wherein,

the cathode in the electroluminescent touch-control display panel is segmented into a plurality of touch-control electrodes arranged in arrays and independent from each other.

10. A display device comprising a touch screen according to claim 9.

11. The touch screen according to claim 9, wherein the display driving circuit board comprises a display driving circuit and a first switching circuit;

and the touch-control driving circuit board comprises a first modulation circuit, a first gating circuit, an enable signal generation circuit and a touch-control detection circuit;

wherein,

the display driving circuit is configured to transmit a synchronization signal to the enable signal generation circuit via the switching circuit board;

the enable signal generation circuit is configured to generate a first enable signal and a second enable signal under the control of the synchronization signal transmitted by the display driving circuit board, transmitting the first enable signal to the first gating circuit during the display period, and transmitting the second enable signal to the first gating circuit during the touch-control period;

the first modulation circuit is configured to generate a first square-wave signal as a touch-control excitation signal, and transmit the touch-control excitation signal to the first gating circuit;

the first gating circuit is configured to receive the excitation signal and the first reference signal provided by the lighting circuit board, upon receiving the first enable signal, gate the first reference signal and then output the first reference signal to the first switching circuit via the switching circuit board, and upon receiving the second enable signal, gate the touch-control excitation signal and then output the touch-control excitation signal to the first switching circuit via the switching circuit board;

the first switching circuit is configured to forward the first reference signal or the touch-control excitation signal received from the first gating circuit to a first reference signal port connected to the cathode in the electroluminescent touch-control display panel, and forward a feedback signal, received from the first reference signal port connected to the cathode in the electroluminescent touch-control display panel, to the touch-control detection circuit via the switching circuit board;

the touch-control detection circuit is configured to determine a position of touch control in the electroluminescent touch-control display panel in accordance with the feedback signal.

12. The touch screen according to claim 11, wherein the display driving circuit board further comprises a second switching circuit;

and the touch-control driving circuit board further comprises a second modulation circuit and a second gating circuit;

wherein

the display driving circuit is further configured to transmit a gate driver circuit on array (GOA) signal to the second gating circuit and the second modulation circuit via the switching circuit board;

the enable signal generation circuit is further configured to under the control of the synchronization signal transmitted by the display driving circuit, transmit the first enable signal to the second gating circuit during the display period, and transmit the second enable signal to the second gating circuit during the touch-control period;

the second modulation circuit is configured to generate a second square-wave signal benchmarked against a voltage of the GOA signal in accordance with the GOA signal, and transmit the second square-wave signal to the second gating circuit;

the second gating circuit is configured to receive the GOA signal and the second square-wave signal, and upon receiving the first enable signal, gate the GOA signal and then output the GOA signal to the second switching circuit via the switching circuit board, and upon receiving the second enable signal, gate the second square-wave signal and then output the second square-wave signal to the second switching circuit via the switching circuit board;

the second switching circuit is configured to transmit the received GOA signal or the second square-wave signal to a signal port of a GOA circuit in the electroluminescent touch-control display panel.

13. The touch screen according to claim 12, wherein an amplitude of the second square-wave signal generated by the second modulation circuit is the same as that of the first square-wave signal generated by the first modulation circuit.

14. The touch screen according to claim 11, wherein the display driving circuit is further configured to transmit a data signal to a data signal port of a pixel circuit in the electroluminescent touch-control display panel during the display period only.

15. The touch screen according to claim 14, wherein the enable signal generation circuit is further configured to under the control of the synchronization signal transmitted by the display driving circuit, transmit the first enable signal to the display driving circuit via the switching circuit board during the display period, and transmit the second enable signal to the display driving circuit via the switching circuit board during the touch-control period;

the display driving circuit is configured to upon receiving the first enable signal, transmit the data signal to the data signal port of the pixel circuit in the electroluminescent touch-control display panel, and upon receiving the second enable signal, stop transmitting the data signal to the data signal port of the pixel circuit in the electroluminescent touch-control display panel.

16. The touch screen according to claim 11, wherein the display driving circuit board further comprises a third switching circuit;

and the touch-control driving circuit board further comprises a third modulation circuit and a third gating circuit;

wherein

the lighting circuit board is further configured to provide a second reference signal to the third gating circuit and the third modulation circuit via the switching circuit board;

the enable signal generation circuit is further configured to under the control of the synchronization signal transmitted by the display driving circuit, transmit the first enable signal to the third gating circuit during the display period, and transmit the second enable signal to the third gating circuit during the touch-control period;

the third modulation circuit is configured to generate a third square-wave signal benchmarked against a voltage of the second reference signal in accordance with the second reference signal, and transmit the third square-wave signal to the third gating circuit;

the third gating circuit is configured to receive the second reference signal and the third square-wave signal, and upon receiving the first enable signal, gate the second reference signal and then output the second reference signal to the third switching circuit via the switching circuit board, and upon receiving the second enable signal, gate the third square-wave signal and then output the third square-wave signal to the third switching circuit via the switching circuit board;

the third switching circuit is configured to transmit the received second reference signal or third square-wave signal, to a second reference signal port of the pixel circuit in the electroluminescent touch-control display panel.

17. The touch screen according to claim 16, wherein, an amplitude of the third square-wave signal generated by the third modulation circuit is the same as that of the first square-wave signal generated by the first modulation circuit.