Force touch structure, touch display panel, display apparatus

• US 10,203,797 B2
• Filed: 06/29/2016
• Issued: 02/12/2019
• Est. Priority Date: 01/28/2016
• 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: Li, Changfeng, Yang, Shengji, Liu, Yingming, Wang, Haisheng, Chen, Xiaochuan, Ding, Xiaoliang, Wang, Lei, Lu, Pengcheng
• Primary Examiner(s): Mercedes, Dismery
• Application Number:
  US15/196,746
• Publication Number:
  US 20170220181A1
• Time in Patent Office: 958 Days
• CPC Class Codes: G06F 2203/04102 Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• 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
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: G09G 3/12 using electroluminescent elements
• CPC Class Codes: G09G 3/3406 Control of illumination source illumination devices structurally associated with liquid crystal cells G02F1/1336
• CPC Class Codes: H01L 31/02322 comprising luminescent members, e.g. fluorescent sheets upon the device
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/156 comprising a multilayered structure

Abstract

The present disclosure proposes a force touch structure, a touch display panel and a display apparatus. The force touch structure comprises a base substrate, a light sensing device located on the base substrate, and a phosphorescence-emitting structure positionally corresponding to the light sensing device. The phosphorescence-emitting structure comprises a first electrode, a second electrode, a phosphorescent layer, and a flexible material layer. The first electrode receives a first voltage signal, the second electrode receives a second voltage signal, and the first electrode and the second electrode are used for forming a capacitor with a constant voltage value under the effects of the first voltage signal and the second voltage signal. The light sensing device is used for receiving phosphorescence emitted by the phosphorescent layer and comparing an intensity of the received phosphorescence with a light intensity detected without force touch to determine the magnitude of force touch.

Claims

1. A force touch structure comprising a base substrate, a light sensing device located on the base substrate, and a phosphorescence-emitting structure positionally corresponding to the light sensing device, wherein

the phosphorescence-emitting structure comprising a first electrode, a second electrode, a phosphorescent layer located between the first electrode and the second electrode, and a flexible material layer located between the phosphorescent layer and one of the first electrode and the second electrode, the first electrode receives a first voltage signal, the second electrode receives a second voltage signal, and a voltage difference between the first voltage signal and the second voltage signal is constant and is nonzero;

the first electrode, the second electrode, the phosphorescent layer and the flexible material layer constitute a capacitor, the capacitor is configured to change an amount of charges in the phosphorescent layer according to a magnitude of force applied on the force touch structure, and the phosphorescent layer is configured to change an intensity of phosphorescence emitted by the phosphorescent layer according to the amount of charges; and

the light sensing device is configured to receive the phosphorescence emitted by the phosphorescent layer, and determine the magnitude of the force according to the intensity of the received phosphorescence.

2. The force touch structure according to claim 1, wherein the first electrode is located below the phosphorescent layer, the second electrode is located above the phosphorescent layer;

the light sensing device is located below the phosphorescence-emitting structure, the first electrode being a transparent electrode;

or

the light sensing device is located above the phosphorescence-emitting structure, the second electrode being a transparent electrode.

3. The force touch structure according to claim 1, wherein the light sensing device comprises a photosensitive diode and a control thin film transistor, the control thin film transistor being used, when turned on, for exporting a current of the photosensitive diode;

one side of the photosensitive diode being at least partially connected to a source or drain of the control thin film transistor, the other side of the photosensitive diode being at least partially connected to a transparent electrode, the source or drain of the control thin film transistor which is at least partially connected to one side of the photosensitive diode being used for receiving a third voltage signal, the transparent electrode being used for receiving a fourth voltage signal, the third voltage signal and the fourth voltage signal being constant-voltage signals with unequal voltage values.

4. The force touch structure according to claim 3, further comprising a light-shielding layer arranged on the base substrate, the light-shielding layer being used for shielding light rays from an ambient environment which is incident into the light sensing device.

5. The force touch structure according to claim 4, wherein a projection area of a portion of the transparent electrode which is connected to the photosensitive diode on the base substrate resides within a projection area of the light-shielding layer on the base substrate.

6. The force touch structure according to claim 1, wherein the phosphorescence-emitting structure further comprises a buffer layer arranged between the phosphorescent layer and the flexible material layer.

7. A touch display panel comprising a force touch structure, the force touch structure comprising a base substrate, a light sensing device located on the base substrate, and a phosphorescence-emitting structure positionally corresponding to the light sensing device, wherein

the phosphorescence-emitting structure comprising a first electrode, a second electrode, a phosphorescent layer located between the first electrode and the second electrode, and a flexible material layer located between the phosphorescent layer and one of the first electrode and the second electrode, the first electrode receives a first voltage signal, the second electrode receives a second voltage signal, and a voltage difference between the first voltage signal and the second voltage signal is constant and is nonzero;

the first electrode, the second electrode, the phosphorescent layer and the flexible material layer constitute a capacitor, the capacitor is configured to change an amount of charges in the phosphorescent layer according to a magnitude of force applied on the force touch structure, and the phosphorescent layer is configured to change an intensity of phosphorescence emitted by the phosphorescent layer according to the amount of charges; and

the light sensing device is configured to receive the phosphorescence emitted by the phosphorescent layer, and determine the magnitude of the force according to the intensity of the received phosphorescence.

8. The touch display panel according to claim 7, wherein the first electrode is located below the phosphorescent layer, the second electrode is located above the phosphorescent layer,

the light sensing device is located below the phosphorescence-emitting structure, the first electrode being a transparent electrode;

or

the light sensing device is located above the phosphorescence-emitting structure, the second electrode being a transparent electrode.

9. A display device comprising the touch display panel according to claim 8.

10. The touch display panel according to claim 7, wherein the light sensing device comprises a photosensitive diode and a control thin film transistor, the control thin film transistor being used, when turned on, for exporting a current of the photosensitive diode;

one side of the photosensitive diode being at least partially connected to a source or drain of the control thin film transistor, the other side of the photosensitive diode being at least partially connected to a transparent electrode, the source or drain of the control thin film transistor which is at least partially connected to one side of the photosensitive diode being used for receiving a third voltage signal, the transparent electrode being used for receiving a fourth voltage signal, the third voltage signal and the fourth voltage signal being constant-voltage signals with unequal voltage values.

11. The touch display panel according to claim 10, further comprising a light-shielding layer arranged on the base substrate, the light-shielding layer being used for shielding light rays from an ambient environment which is incident into the light sensing device.

12. The touch display panel according to claim 11, wherein a projection area of a portion of the transparent electrode which is connected to the photosensitive diode resides on the base substrate within a projection area of the light-shielding layer on the base substrate.

13. The touch display panel according to claim 7, wherein the phosphorescence-emitting structure further comprises a buffer layer arranged between the phosphorescent layer and the flexible material layer.

14. The touch display panel according to claim 7, comprising an array substrate and a color film substrate oppositely arranged to each other, and a black matrix located at a side of the array substrate facing the color film substrate, or a black matrix located at a side of the color film substrate facing the array substrate;

the force touch structure being arranged on the array substrate and/or the color film substrate.

15. The touch display panel according to claim 14, wherein the force touch structure is arranged in an area positionally corresponding to the black matrix.

16. The touch display panel according to claim 14, wherein the force touch structure is arranged on the array substrate, the first electrode or the second electrode of the force touch structure being arranged in the same layer as a pixel electrode or a common electrode on the array substrate.

17. The touch display panel according to claim 14, wherein the force touch structure is arranged on the array substrate, the first electrode or the second electrode of the force touch structure being arranged in the same layer as a gate or a source and a drain on the array substrate.

18. The touch display panel according to claim 7, comprising an array substrate and a packaging cover plate oppositely arranged to each other, and an organic light-emitting structure arranged at a side of the array substrate facing the packaging cover plate;

the force touch structure being arranged on the array substrate and/or the packaging cover plate.

19. The touch display panel according to claim 18, wherein the force touch structure is arranged in an area corresponding to a non-light emitting area of the touch display panel.

20. A display device comprising the touch display panel according to claim 7.