A touch display panel and a display device

Abstract

The present invention discloses a touch display panel and a display device. The touch display panel includes: a display panel body and a touch panel located on the light-emitting side of the display panel body; the display panel body includes: a substrate, the substrate includes a display area and a non-display area surrounding the display area; an organic electroluminescent film layer located between the substrate and the touch panel, the organic electroluminescent film layer includes a cathode layer disposed adjacent to the touch panel, and the orthographic projection of the cathode layer on the substrate covers the display area and at least part of the non-display area; a metal frame located between the substrate and the organic electroluminescent film layer, the orthographic projection of the metal frame on the substrate is located in the non-display area, at least part of the orthographic projection of the metal frame on the substrate is covered by the orthographic projection of the cathode layer on the substrate, and the metal frame is grounded. The touch display panel can solve the problem of screen flashing caused by electromagnetic interference generated by the touch panel applying high-frequency high-voltage signals to the display panel.

Description

Technical Field

[0001] The present invention relates to the technical field of display devices, and particularly relates to a touch display panel and a display device. Background Art

[0002] As consumers' requirements for mobile phone functions are getting higher and higher, haptic feedback has been redefined. In the early days, haptic feedback was realized by adding a touch sensor to the mobile phone motherboard to vibrate for incoming calls and messages. However, human touch is a relatively important dimension. Therefore, with the further development of technology, in order to achieve more delicate haptic feedback for the displayed content, such as perceiving different textures, different objects, etc., and further improving the user experience of the mobile phone, a touch sensor plus a high-voltage high-frequency driving method is used to achieve haptic feedback.

[0003] Since the touch sensor requires high-voltage high-frequency driving, relatively serious electromagnetic radiation will be generated. And the organic electroluminescent display panel is current-driven, and its signal is extremely sensitive to radiation, so it will cause jitter, thus bringing the problem of display screen flickering. Summary of the Invention

[0004] The present invention provides a touch display panel and a display device. The above touch display panel can solve the problem of screen flickering caused by electromagnetic interference generated by the touch panel applying high-frequency high-voltage signals to the display panel.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A touch display panel includes a display panel body and a touch panel located on the light-emitting side of the display panel body; the display panel body includes:

[0007] A substrate, the substrate includes a display area and a non-display area located around the display area;

[0008] An organic electroluminescent film layer located between the substrate and the touch panel. The organic electroluminescent film layer includes a cathode layer disposed adjacent to the touch panel. The orthographic projection of the cathode layer on the substrate covers the display area and at least part of the non-display area;

[0009] A metal frame located between the substrate and the organic electroluminescent film layer. The orthographic projection of the metal frame on the substrate is located in the non-display area. The orthographic projection of the metal frame on the substrate is at least partially covered by the orthographic projection of the cathode layer on the substrate, and the metal frame is grounded.

[0010] In the touch display panel provided by the embodiment of the present invention, it includes a display panel body and a touch panel located on the light-emitting side of the display panel body. Among them, the display panel body includes a substrate, an organic electroluminescent film layer located between the substrate and the touch panel, and a metal frame located between the substrate and the organic electroluminescent film layer. The cathode layer in the organic electroluminescent film layer is arranged adjacent to the touch panel. When a high-voltage and high-frequency pressure-sensitive signal is applied to the touch panel, an electromagnetic interference signal will be generated on the cathode. Since there is a metal frame between the substrate and the organic electroluminescent film layer, and at least part of the orthographic projection of the metal frame on the substrate is covered by the orthographic projection of the cathode on the substrate, a capacitor can be formed between the metal frame and the cathode layer, and the metal frame is grounded, so that the electromagnetic interference on the cathode layer can be filtered out through the capacitor, thereby solving the problem of screen flashing caused by electromagnetic interference in the existing display panel body and ensuring a good display screen of the touch display panel.

[0011] Optionally, it further includes a driving device located in the non-display area for driving the display panel body to emit light and a flexible circuit board. The driving device is electrically connected to the flexible circuit board, and the metal frame is electrically connected to the ground terminal of the flexible circuit board through the driving device.

[0012] Optionally, the display panel body further includes a pixel circuit array located between the substrate and the organic electroluminescent film layer. The pixel circuit array is composed of multiple thin film transistors, and the pixel circuit array includes multiple mutually insulated functional metal layers for electrical connection of the pixel circuit. One of the functional metal layers is a source-drain metal layer.

[0013] Optionally, the metal frame is arranged on the same layer as the source-drain metal layer.

[0014] Optionally, the metal frame includes at least two sub-metal layers arranged along the thickness direction of the substrate, and the sub-metal layers are electrically connected through vias.

[0015] Optionally, different sub-metal layers are arranged on the same layer as different functional metal layers, and one of the sub-metal layers is arranged on the same layer as the source-drain metal layer.

[0016] Optionally, the metal frame is arranged around the display area, and the metal frame has a notch connecting the inside and the outside of the metal frame.

[0017] Optionally, the orthographic projection of the metal frame on the substrate is completely covered by the orthographic projection of the cathode layer on the substrate.

[0018] Optionally, the orthographic projection of the area of the metal frame adjacent to the display area on the substrate is covered by the orthographic projection of the cathode layer on the substrate.

[0019] The present invention also provides a display device, which adopts any one of the touch display panels provided in the above technical solutions. Description of the Drawings

[0020] Figure 1a is a schematic structural diagram of a touch panel in the prior art;

[0021] Figure 1b is a waveform diagram of high-voltage driving on a touch panel in the prior art;

[0022] Figure 1c is a circuit diagram of a pixel driving circuit in the prior art;

[0023] Figure 1d is Figure 1c the in-phase waveform diagram of the positive power supply terminal VDD and the data signal DATA on the touch panel in being interfered by high-voltage driving;

[0024] Figure 2 is a schematic structural diagram of a touch display panel provided by an embodiment of the present invention;

[0025] Figure 3 is a schematic diagram of eliminating electromagnetic interference of a touch display panel provided by an embodiment of the present invention;

[0026] Figure 4 is a waveform comparison diagram of voltage change on the cathode layer provided by an embodiment of the present invention;

[0027] Figure 5 is a cross-sectional view of a metal frame provided by an embodiment of the present invention;

[0028] Figure 6 is a schematic plan view of a touch display panel provided by an embodiment of the present invention;

[0029] Figure 7 is a schematic plan view of a touch display panel provided by an embodiment of the present invention.

[0030] Icon:

[0031] 11 - Organic electroluminescent film layer; 111 - Cathode layer; 12 - Metal frame; 121 - Notch; 13 - Encapsulation layer; 2 - Touch panel; 3 - Driving device; 4 - Flexible circuit board. Detailed Embodiments

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] Currently, as Figure 1a shown, the touch panel 01 on the display panel includes touch electrodes 011 distributed in an array; by applying a high-voltage and high-frequency pressure-sensitive signal to the touch electrodes 01, as Figure 1b shown, a more delicate tactile feedback can be achieved. Since the pressure-sensitive signal has the characteristics of high voltage and high frequency, a large amount of electromagnetic radiation will be generated. This radiation will inevitably affect the signal in the pixel. Through experiments, it is obtained that the greater the frequency and amplitude of the pressure-sensitive signal, the greater the interference with the pixel signal, and the interference superimposed on the pixel signal is in the same frequency and phase as the pressure-sensitive signal.

[0034] As Figure 1c shown, a pixel driving circuit may include a thin-film transistor T1, a thin-film transistor T2, and a storage capacitor Cs; wherein, I oled =k×(Vdata - ELVDD)^2, I oled is the driving current on the organic light-emitting diode OLED, k is the current amplification factor of the thin-film transistor T1, Vdata is the voltage of the data signal Data, and ELVDD is the voltage of the positive power supply terminal VDD. Since the electromagnetic interference received by Vdata and ELVDD is the same, the interference between the two can be cancelled out, as Figure 1d shown; then the main cause of the screen flashing is the electromagnetic interference on the voltage ELVSS of the negative power supply terminal VSS. Therefore, in order to solve the problem of screen flashing caused by the electromagnetic interference of ELVSS, it is necessary to filter out the interference signal on the cathode.

[0035] Please refer to Figure 2 and Figure 3 , an embodiment of the present invention provides a touch display panel, including a display panel body and a touch panel 2 located on the light-emitting side of the display panel body; the display panel body includes:

[0036] a substrate, the substrate includes a display area and a non-display area located around the display area;

[0037] an organic light-emitting film layer 11 located between the substrate and the touch panel 2, the organic light-emitting film layer 11 includes a cathode layer 111 disposed adjacent to the touch panel 2, and the orthographic projection of the cathode layer 111 on the substrate covers the display area and at least part of the non-display area;

[0038] A metal frame 12 is located between the substrate and the organic electroluminescent film layer 11. The orthographic projection of the metal frame 12 on the substrate is located in the non-display area. At least part of the orthographic projection of the metal frame 12 on the substrate is covered by the orthographic projection of the cathode layer 111 on the substrate, and the metal frame 12 is grounded.

[0039] In the touch display panel provided by the embodiment of the present invention, it includes a display panel body and a touch panel 2 located on the light-emitting side of the display panel body. Among them, the display panel body includes a substrate, an organic electroluminescent film layer 11 located between the substrate and the touch panel 2, and a metal frame 12 located between the substrate and the organic electroluminescent film layer 11. The cathode layer 111 in the organic electroluminescent film layer 11 is arranged adjacent to the touch panel 2. When a high-voltage and high-frequency pressure-sensitive signal is applied to the touch panel 2, an electromagnetic interference signal will be generated on the cathode. Since there is a metal frame 12 between the substrate and the organic electroluminescent film layer 11, and at least part of the orthographic projection of the metal frame 12 on the substrate is covered by the orthographic projection of the cathode on the substrate, a capacitor C can be formed between the metal frame 12 and the cathode layer 111, and the metal frame 12 is grounded. As Figure 3 shown, it can be realized that the electromagnetic interference on the cathode layer 111 is filtered out by the capacitor, thereby solving the problem of screen flashing caused by electromagnetic interference in the existing display panel body and ensuring a good display picture of the touch display panel.

[0040] As Figure 4 shown, the signal ELVSS on the cathode layer 111 that is affected by electromagnetic interference can obtain a stable signal after being filtered by the capacitor, ensuring that the voltage on the cathode always tends to be stable.

[0041] Specifically, as Figure 2 shown, the above touch display panel further includes a driving device 3 located in the non-display area and used to drive the display panel body to emit light and a flexible circuit board 4. The driving device 3 is electrically connected to the flexible circuit board 4. The metal frame 12 can be electrically connected to the grounding end of the flexible circuit board 4 through the driving device 3 to realize grounding of the metal frame 12. The wiring method is simple and convenient to implement. For example, the metal frame 12 can be directly electrically connected to the grounding end of the driving device 3 through a lead, and the grounding end of the driving device 3 can be directly electrically connected to the grounding end of the flexible circuit board 4.

[0042] Specifically, the above organic electroluminescent film layer 11 may specifically include an anode layer, an organic light-emitting layer, and a cathode layer 111 arranged in a stacked manner. Among them, the anode layer may include a plurality of anodes arranged in an array, and a sub-pixel can be formed in the area corresponding to each anode in the organic electroluminescent film layer 11. The organic electroluminescent film layer 11 may further include other film layers, which are not limited here and are determined according to actual situations.

[0043] In the touch display panel provided by the above-mentioned invention embodiment, the display panel body further includes a pixel circuit array located between the substrate and the organic electro-reflective film layer. The pixel circuit array can be composed of multiple thin film transistors. The pixel circuit array includes multiple mutually insulated functional metal layers for electrical connection of the pixel circuit. For example, the multiple functional metal layers can include a source-drain metal layer, a gate metal layer, etc. Among them, an insulating layer is provided between different functional metal layers to insulate the functional metal layers. The insulating layer can be set to at least one layer, and there is no limitation here.

[0044] Specifically, each thin film transistor can include an active layer, a gate, a source, and a drain. Among them, the gate can be located in the gate metal layer, and the source and the drain can be located in the source-drain metal layer. The driving device 3 can drive the organic electro-luminescent film layer 11 to emit light and display an image through the pixel circuit array.

[0045] In the touch display panel provided by the above-mentioned invention embodiment, the metal frame 12 can be single-layer. The single-layer metal frame 12 can be arranged on the same layer as the source-drain metal layer. The metal frame 12 and the cathode layer 111 can form a capacitor, and the metal frame 12 is grounded, which can filter out the electromagnetic interference on the cathode through the capacitor.

[0046] In the touch display panel provided by the above-mentioned invention embodiment, the metal frame 12 can also be multi-layer, that is, the metal frame 12 can include at least two sub-metal layers arranged along the thickness direction of the substrate. The sub-metal layers can be electrically connected through vias.

[0047] Specifically, different sub-metal layers can be arranged with different functional metal layers, and one of the sub-metal layers is arranged on the same layer as the source-drain metal layer. For example, as Figure 5 shown, the metal frame 12 can include two sub-metal layers. One of the sub-metal layers 12a can be arranged on the same layer as the source-drain metal layer, and the other sub-metal layer 12b can be arranged on the same layer as the gate metal layer. Setting the metal frame 12 to include at least two sub-metal layers can reduce the resistance of the metal frame 12 through the parallel connection of multiple sub-metal layers, which is beneficial to the filtering of electromagnetic interference.

[0048] In the touch display panel provided by the above-mentioned invention embodiment, as Figure 6 , the metal frame 12 can be arranged in the non-display area BB and surround the display area AA.

[0049] Optionally, as Figure 7 shown, the metal frame 12 can also have a notch 121 connecting the inside and the outside of the metal frame 12. The metal frame 12 can form a capacitor with the cathode, which is convenient for filtering out the electromagnetic interference on the cathode.

[0050] In the touch display panel provided by the above-mentioned invention embodiment, the orthographic projection of the metal frame 12 on the substrate can be completely covered by the orthographic projection of the cathode layer 111 on the substrate, as Figure 6 shown; optionally, the orthographic projection of the metal frame 12 on the substrate can also be partially covered by the orthographic projection of the cathode layer 111 on the substrate. Specifically, the orthographic projection of the area of the metal frame 12 adjacent to the display area on the substrate can be covered by the orthographic projection of the cathode layer 111 on the substrate. All or part of the area of the metal frame 12 can form a capacitor with the cathode layer 111, so as to filter out the electromagnetic interference on the cathode layer 111.

[0051] Specifically, as Figure 2 shown, a packaging layer 13 can also be provided on the side of the organic electroluminescent film layer 11 in the display panel body facing away from the substrate, which can package the display panel body and isolate water and oxygen from entering the inside of the display panel. Among them, the above-mentioned packaging layer 13 can be one layer or multiple layers, which is not limited here and depends on the actual situation.

[0052] The embodiment of the present invention also provides a display device, which adopts any one of the touch display panels provided in the above technical solutions.

[0053] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the present invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims

1. A touch display panel, characterized in that, It includes a display panel body and a touch panel located on the light-emitting side of the display panel body; the display panel body includes: A substrate, which includes a display area and a non-display area surrounding the display area; An organic electroluminescent film layer located between the substrate and the touch panel. The organic electroluminescent film layer includes a cathode layer disposed adjacent to the touch panel. The orthographic projection of the cathode layer on the substrate covers the display area and at least part of the non-display area; A metal frame located between the substrate and the organic electroluminescent film layer. The orthographic projection of the metal frame on the substrate is located in the non-display area. At least part of the orthographic projection of the metal frame on the substrate is covered by the orthographic projection of the cathode layer on the substrate, and the metal frame is grounded; The display panel body further includes a pixel circuit array located between the substrate and the organic electroluminescent film layer. The pixel circuit array includes multiple layers of mutually insulated functional metal layers for electrical connection of the pixel circuits. One of the functional metal layers is a source-drain metal layer, and the metal frame is at least arranged on the same layer as the source-drain metal layer; The high voltage and high-frequency signals applied to the touch panel can generate electromagnetic interference to the voltage on the cathode layer; a capacitor can be formed between the metal frame and the cathode layer to filter out the electromagnetic interference on the cathode layer; The metal frame is a closed annular structure surrounding the display area. At least the area of the metal frame adjacent to the display area is covered by the orthographic projection of the cathode layer on the substrate; 2. The touch display panel according to claim 1, wherein It further includes a driving device located in the non-display area for driving the display panel body to emit light and a flexible circuit board. The driving device is electrically connected to the flexible circuit board, and the metal frame is electrically connected to the ground terminal of the flexible circuit board through the driving device; 3. The touch display panel according to claim 1, wherein The metal frame is arranged on the same layer as the source-drain metal layer; 4. The touch display panel according to claim 1, wherein The metal frame includes at least two sub-metal layers arranged along the thickness direction of the substrate, and the sub-metal layers are electrically connected through vias; 5. The touch display panel according to claim 4, wherein Different sub-metal layers are arranged on the same layer as different functional metal layers, and one of the sub-metal layers is arranged on the same layer as the source-drain metal layer; 6. The touch display panel according to claim 1, wherein The metal frame is arranged around the display area, and the metal frame has a notch connecting the inside and the outside of the metal frame; 7. The touch display panel according to any one of claims 1-6, characterized in that, The orthographic projection of the metal frame on the substrate is entirely covered by the orthographic projection of the cathode layer on the substrate; 8. A display device, characterized in that, It includes the touch display panel according to any one of claims 1-7.

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