Display panel and display device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BOE TECHNOLOGY GROUP CO LTD
- Filing Date
- 2024-09-29
- Publication Date
- 2026-07-14
Smart Images
Figure CN122396955A_ABST
Abstract
Description
Display panel and display device TECHNICAL FIELD
[0001] Embodiments of the present application relate to the technical field of display, and in particular, to a display panel and a display device. BACKGROUND
[0002] Currently, in a liquid crystal display (LCD), a light sensing device can be arranged on a display panel (PNL) to detect the brightness of ambient light, and the brightness of the display panel is automatically adjusted according to the brightness of the ambient light. In the related art, the light sensing device is arranged on the display panel, a voltage dividing resistor of the light sensing device is arranged on a flexible printed circuit (FPC), and the change of the voltage output by the light sensing device is detected by a driving chip to determine the illumination value of the ambient light. The scheme of arranging the voltage dividing resistor on the FPC occupies the space of the FPC and outer lead bonding (OLB), thereby causing the problem of productization difficulty.
[0003] SUMMARY
[0004] Embodiments of the present application provide a display panel and a display device, which are used to solve the problem that arranging a voltage dividing resistor of a light sensing device on a flexible printed circuit of a liquid crystal display occupies the space of the flexible printed circuit and outer lead bonding, thereby causing the problem of productization difficulty.
[0005] To solve the above technical problem, the present application is implemented as follows:
[0006] In a first aspect, an embodiment of the present application provides a display panel, comprising:
[0007] a substrate substrate;
[0008] a light sensing device arranged on the substrate substrate, configured to receive ambient light and output a light sensing voltage signal based on the received ambient light;
[0009] a light sensing signal line arranged on the substrate substrate and connected with the light sensing device, comprising a first light sensing signal line configured to transmit the light sensing voltage signal;
[0010] a voltage dividing resistor arranged on the substrate substrate, one end of which is connected with the first light sensing signal line and the other end of which is connected with a ground point.
[0011] Optionally, the light sensing device is a thin film transistor, which comprises a gate, a semiconductor layer, a source and a drain, and the conductivity of the semiconductor layer changes under the action of light;
[0012] The light sensing signal line further comprises a second light sensing signal line and a third light sensing signal line.
[0013] The first light sensing signal line is connected with the drain electrode and is used for transmitting the light sensing voltage signal output by the drain electrode.
[0014] The second light sensing signal line is connected with the gate electrode and is used for transmitting a voltage signal for turning on the thin film transistor to the gate electrode.
[0015] The third light sensing signal line is connected with the source electrode and is used for transmitting a detection voltage signal to the source electrode.
[0016] Optionally, the display panel further comprises:
[0017] The light filter is arranged on a side of the light sensing device away from the substrate and is used for filtering light other than light of a specific wavelength.
[0018] Optionally, the light filter comprises a red light filter, a green light filter and a blue light filter.
[0019] The light sensing device comprises:
[0020] The first light sensing device is arranged on a side of the red light filter close to the substrate.
[0021] The second light sensing device is arranged on a side of the green light filter close to the substrate.
[0022] The third light sensing device is arranged on a side of the blue light filter close to the substrate.
[0023] Optionally, the display panel further comprises a light shielding sheet, and the light sensing device further comprises a fourth light sensing device arranged on a side of the light shielding sheet close to the substrate.
[0024] Optionally, the voltage dividing resistor is a voltage dividing line.
[0025] Optionally, the light sensing device, the light sensing signal line and the voltage dividing resistor are arranged in a non-display area of the display panel.
[0026] Optionally, the voltage dividing line winds at least one round around a display area of the display panel.
[0027] Optionally, the voltage dividing line is located at a periphery of the light sensing signal line.
[0028] Optionally, a number of rounds of the voltage dividing line is determined according to at least one of a required voltage dividing resistance value, a thickness of the voltage dividing line, a resistance value of the voltage dividing line, and a width of the voltage dividing line.
[0029] Optionally, the voltage dividing line adopts a transparent conductive material.
[0030] In a second aspect, an embodiment of the present application provides a display device, comprising a display panel, a driving chip and a host, the display panel being the display panel in the first aspect;
[0031] The driving chip is connected with the first light sensing signal line of the display panel, and is configured to determine an illumination value of ambient light according to a light sensing voltage signal input by the first light sensing signal line.
[0032] The host is configured to automatically adjust the brightness of the display panel according to the illumination value of the ambient light.
[0033] In the embodiment of the present application, the voltage dividing resistor is arranged inside the display panel to replace the voltage dividing resistor arranged on the FPC in the related art, so that the voltage dividing resistor of the light sensing device is realized while the space of the FPC and the OLB is saved, which is beneficial to productization. BRIEF DESCRIPTION OF DRAWINGS
[0034] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments and are not intended to limit the scope of the application. Moreover, the same reference numerals in different figures represent the same or similar components. In the drawings:
[0035] FIG. 1 is a structural schematic diagram of a display device in the related art;
[0036] FIG. 2 is a structural schematic diagram of a display panel in an embodiment of the present application;
[0037] FIG. 3 is a structural schematic diagram of a display panel in another embodiment of the present application;
[0038] FIG. 4 is an enlarged schematic diagram of A in the display panel shown in FIG. 3;
[0039] FIG. 5 is an equivalent circuit diagram of a display device in an embodiment of the present application. DETAILED DESCRIPTION
[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.
[0041] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a display device in the related art, the display device comprising a display panel, a driving chip (IC) 20 and a flexible circuit board (FPC) 30, wherein the display panel comprises a substrate 10 and a light sensing device 11, the light sensing device 11 is connected with a resistor 31 on the FPC 30 through a light sensing signal line 12, and the light sensing signal line 12 is connected to the driving chip 20 through a circuit on the FPC, and the resistor 31 is used as a voltage dividing resistor of the light sensing device 11. The scheme of arranging the voltage dividing resistor on the FPC not only occupies the space of the FPC and outer lead bonding (OLB), but also increases the cost of the resistor, thereby causing the problem of productization difficulty.
[0042] To solve the above problem, referring to FIG. 2, an embodiment of the present application provides a display panel, comprising:
[0043] a substrate 100;
[0044] a light sensing device 101 arranged on the substrate 100, used for receiving ambient light and outputting a light sensing voltage signal based on the received ambient light;
[0045] a light sensing signal line 102 arranged on the substrate 100 and connected with the light sensing device 101, comprising a first light sensing signal line 102a, the first light sensing signal line 102a being used for transmitting the light sensing voltage signal;
[0046] a voltage dividing resistor 103 arranged on the substrate 100, one end of the voltage dividing resistor 103 being connected with the first light sensing signal line 102a, and the other end of the voltage dividing resistor 103 being connected with a ground point (GND). For example, the ground point is a ground point on the display panel.
[0047] In the embodiment of the present application, the voltage dividing resistor is arranged inside the display panel, which is used to replace the voltage dividing resistor arranged on the FPC in the related art, thereby achieving the voltage dividing resistor of the light sensing device, saving the space of the FPC and OLB, and being beneficial to productization. In addition, the voltage dividing resistor arranged inside the display panel is not easily affected by the voltage change output by the light sensing device, and thus the detection result of the ambient light brightness is more accurate than the original resistor scheme outside the FPC.
[0048] In the embodiment of the present application, as shown in FIG. 3 and FIG. 4, the light sensing device 101 is a thin film transistor (TFT), which includes a gate (G) 101a, a semiconductor layer (not shown), a source (S) 101b and a drain (D) 101c. The semiconductor layer changes its conductive performance under the action of light. That is, the semiconductor layer of the thin film transistor has the sensitivity to light. When the ambient light brightness changes, the conductive performance of the semiconductor layer also changes, so that the resistance of the thin film transistor changes. When detecting the ambient light, a detection voltage signal is input to the source 101b of the thin film transistor. When the light sensing voltage signal output by the drain 101c changes, it indicates that the ambient light brightness changes. According to the size of the light sensing voltage signal output by the drain 101c, the illumination value of the ambient light can be determined.
[0049] In the embodiment of the present application, the semiconductor layer can be made of amorphous silicon (a-Si) material, which is sensitive to light and can better sense the change of ambient light. Of course, the semiconductor layer in the embodiment of the present application is not limited to other semiconductor materials.
[0050] In the embodiment of the present application, the thin film transistor as the light sensing device can have the same structure as the thin film transistor for controlling the sub-pixel switch in the display panel, and can be manufactured by the same process.
[0051] It should be noted that, in the embodiment of the present application, in addition to the thin film transistor, other types of light sensing devices are not excluded.
[0052] It should be noted that, the number of the light sensing device 101 can be one or more.
[0053] In the embodiment of the present application, as shown in FIG. 3 and FIG. 4, the light sensing signal line 102 can further include a second light sensing signal line 102b and a third light sensing signal line 102c.
[0054] The first light sensing signal line 102a is connected with the drain 101c, and is used to transmit the light sensing voltage signal output by the drain 101c.
[0055] The second light sensing signal line 102b is connected with the gate 101a, and is used to transmit a voltage signal for turning on the thin film transistor to the gate 101a.
[0056] The third light sensing signal line 102c is connected with the source 101b, and is used to transmit a detection voltage signal to the source 101b.
[0057] Optionally, the first light sensing signal line 102a, the second light sensing signal line 102b and the third light sensing signal line 102c can adopt the same material as the signal line (such as the gate or the data line) in the display panel, for example, the second light sensing signal line 102b connected with the gate 101a can adopt the same material as the gate line, and simultaneously form the first light sensing signal line 102a connected with the drain 101c and the third light sensing signal line 102c connected with the source 101b, which can adopt the same material as the data line and simultaneously form.
[0058] Please refer to FIG. 3, in the embodiment of the present application, the first light sensing signal line 102a, the second light sensing signal line 102b and the third light sensing signal line 102c are connected to the driving chip (IC) 200 from the display panel.
[0059] Please refer to FIG. 3 and FIG. 4, the display panel of the embodiment of the present application further comprises: a filter 104, which is arranged on the side of the light sensing device 101 away from the substrate 100, for filtering other light rays except for specific wavelength light rays. In the embodiment of the present application, by arranging the filter 104 on the side of the light sensing device 101 facing the ambient light, the brightness of the specific wavelength light rays can be detected as needed.
[0060] Optionally, the orthographic projection of the semiconductor layer of the light sensing device 101 on the substrate 100 is located in the orthographic projection area of the corresponding filter 104 on the substrate 100.
[0061] Optionally, the filter 104 comprises a red filter (R), a green filter (G) and a blue filter (B). The red filter is used to filter other light rays except for red light, so that the light entering the corresponding light sensing device 101 is red light. The green filter is used to filter other light rays except for green light, so that the light entering the corresponding light sensing device 101 is green light. The blue filter is used to filter other light rays except for blue light, so that the light entering the corresponding light sensing device 101 is blue light. That is, the brightness of the red light, the green light and the blue light in the external ambient light can be detected respectively.
[0062] It should be noted that the display area (AA area) of the display panel can also comprise a color filter for realizing color display, and optionally, the color filter can also comprise a red filter, a green filter and a blue filter. The filter for the light sensing device in the embodiment of the present application can adopt the same material as the color filter for color display and be formed simultaneously.
[0063] Optionally, the number of the filters 104 is the same as the number of the light sensing devices 101, and each filter corresponds to one light sensing device.
[0064] In some embodiments, the light sensing device 101 comprises:
[0065] a first light sensing device disposed on a side of the red filter close to the substrate 100;
[0066] a second light sensing device disposed on a side of the green filter close to the substrate 100;
[0067] a third light sensing device disposed on a side of the blue filter close to the substrate 100.
[0068] For the convenience of drawing, only the third light sensing device corresponding to the blue filter is shown in FIG. 3, and the first light sensing device corresponding to the red filter and the second light sensing device corresponding to the green filter are not shown.
[0069] In the embodiments of the present application, referring to FIG. 3, the display panel can further comprise a light shielding sheet (D) 105; the light sensing device 101 further comprises a fourth light sensing device (not shown in the figure) disposed on a side of the light shielding sheet close to the substrate 100. Optionally, the orthographic projection of the semiconductor layer of the fourth light sensing device on the substrate 100 is located in the orthographic projection area of the light shielding sheet 105 on the substrate 100, so that the semiconductor layer of the fourth light sensing device is completely shielded by the light shielding sheet 105 and is not irradiated by ambient light. Since the semiconductor layer of the fourth light sensing device is not irradiated by ambient light, the brightness change of the ambient light will not affect the resistance of the fourth light sensing device, so that the light sensing voltage signal output from the drain of the fourth light sensing device will not change due to the brightness of the ambient light, so that the light sensing voltage signal output from the drain of the fourth light sensing device can be used as a reference voltage signal, which is used to compare with the light sensing voltage signals output by the first light sensing device, the second light sensing device and the third light sensing device, to determine whether the light sensing voltage signals output by the first light sensing device, the second light sensing device and the third light sensing device change and the change amount, so as to determine the change of the illuminance value of the ambient light.
[0070] In the embodiments of the present application, optionally, the light shielding sheet 105 can be formed of the same material as the black matrix, or other light shielding materials such as metal materials.
[0071] In the embodiments of the present application, referring to FIG. 3, the voltage dividing resistor 103 is a voltage dividing line. In the embodiments of the present application, based on the voltage dividing line as the voltage dividing resistor, the FPC device can be reduced by 4 resistors, and the OLB can be reduced by 10 pins, which greatly reduces the space of the FPC and the OLB and reduces the cost.
[0072] In some embodiments, the light sensing device 101, the light sensing signal line 102 and the voltage dividing resistor 103 are optionally arranged in the non-display area of the display panel. The display panel comprises a display area and a non-display area, and the non-display area is located at the periphery of the display area. Referring to the embodiment shown in FIG. 3, the light sensing device 101 is located in the non-display area, and specifically, can be located in the non-display area above the display area. The light sensing signal line 102 is connected to the driving chip 200 through the non-display area on the left and / or right side of the display area. The voltage dividing resistor 103 (voltage dividing line) is wound in the non-display area.
[0073] Optionally, the voltage dividing line is wound at least one circle around the display area of the display panel.
[0074] Optionally, the number of circles of the voltage dividing line is determined according to at least one of the required voltage dividing resistance, the thickness of the voltage dividing line, the resistance of the voltage dividing line, and the width of the voltage dividing line. For example, in the embodiment shown in FIG. 3, each light sensing device 101 corresponds to one voltage dividing line, and it is assumed that the required resistance of each voltage dividing line is 10MΩ, and one circle of the voltage dividing line is 5MΩ (for example, the thickness (THK) of the voltage dividing line is 400A, the resistance (Rs) is 62±6Ω, and the width is 4.6±0.6μm), so each voltage dividing line needs to be wound 2 circles around the display area. The voltage dividing lines corresponding to the four light sensing devices 101 need to be wound 8 circles in total.
[0075] In some embodiments, the voltage dividing line is optionally located at the periphery of the light sensing signal line, thereby facilitating wiring.
[0076] In some embodiments, the positional relationship of the wiring in the non-display area of the display panel can be in turn from inside to outside: the common electrode (VCOM) bus, the gate driving circuit (Gate Driver on Array, GOA) wiring, the clock (CLK) line, the light sensing signal line, the voltage dividing line, and the ground line (GND). The light sensing signal line and the voltage dividing line can be located in different layers, and thus actual wiring allows a certain overlap.
[0077] In some embodiments, the voltage dividing line is made of transparent conductive material, such as indium tin oxide (ITO) material. Optionally, the voltage dividing line can be formed at the same time as the patterns (such as pixel electrodes, common electrodes, etc.) in the display panel that are made of ITO material. Of course, it is not excluded that other conductive materials are used to form the voltage dividing line.
[0078] The display panel in the embodiments of the present application can be a liquid crystal display panel.
[0079] The display device also provided by the embodiment of the present application comprises a display panel and a driving chip, the display panel is the display panel in any of the above embodiments, the driving chip is connected with the first light sensing signal line of the display panel, and is used for determining the illumination value of ambient light according to the light sensing voltage signal input by the first light sensing signal line.
[0080] The driving chip in the embodiment of the present application can comprise an analog-to-digital converter (ADC) and a micro control unit (MCU). The analog-to-digital converter (ADC) is connected with the first light sensing signal line of the display panel, and is used for converting the light sensing voltage signal input by the first light sensing signal line into a digital voltage signal. The micro control unit (MCU) is used for converting the digital voltage signal (ADC value) input by the analog-to-digital converter (ADC) into the illumination value (i.e. brightness) of ambient light. The driving chip in the embodiment of the present application can transmit the obtained illumination value of ambient light to the host of the display device, and the host automatically adjusts the brightness of the display panel according to the illumination value of ambient light.
[0081] Optionally, the micro control unit (MCU) converts the input digital voltage signal into the illumination value of ambient light according to the pre-stored response curve of ambient light brightness and voltage value.
[0082] Please refer to FIG. 5, which is an equivalent circuit diagram of the display device in the embodiment of the present application. The display panel (PNL) comprises a light sensing device (such as TFT sensor) and a voltage dividing line (such as ITO voltage dividing line), and the driving chip can comprise an analog-to-digital converter (ADC) and a micro control unit (MCU). The light sensing device outputs a light sensing voltage signal according to the received ambient light, and transmits the light sensing voltage signal to the analog-to-digital converter (ADC). The analog-to-digital converter (ADC) converts the input light sensing voltage signal into a digital voltage signal. The micro control unit (MCU) is used for converting the digital voltage signal input by the analog-to-digital converter (ADC) into the illumination value (i.e. brightness) of ambient light, and transmitting the illumination value to the application processor (Application Processor) in the host. The application processor (Application Processor) automatically adjusts the brightness of the display panel according to the illumination value of ambient light.
[0083] The driving chip in the embodiment of the present application can be a touch and display driver integration (TDDI), i.e. a driving chip integrating a display driving chip and a touch driving chip.
[0084] Optionally, the touch chip can be connected with the host through an Inter-Integrated Circuit (I2C) or a Serial Peripheral Interface (SPI).
[0085] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the specific embodiments described above, and the specific embodiments described above are merely illustrative rather than restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims, which all belong to the protection of the present application.
Claims
1. A display panel, characterized by, Comprising: a substrate substrate; a light sensing device, disposed on the substrate substrate, for receiving ambient light and outputting a light sensing voltage signal based on the received ambient light; a light sensing signal line, disposed on the substrate substrate, connected with the light sensing device, comprising a first light sensing signal line, the first light sensing signal line being used for transmitting the light sensing voltage signal; a voltage dividing resistor, disposed on the substrate substrate, one end connected with the first light sensing signal line, the other end connected with a ground point.
2. The display panel according to claim 1, wherein: the light sensing device is a thin film transistor, the thin film transistor comprising a gate, a semiconductor layer, a source and a drain, the conductivity of the semiconductor layer changing under the action of light; the light sensing signal line further comprises a second light sensing signal line and a third light sensing signal line; the first light sensing signal line is connected with the drain and is used for transmitting the light sensing voltage signal output by the drain; the second light sensing signal line is connected with the gate and is used for transmitting a voltage signal for turning on the thin film transistor to the gate; the third light sensing signal line is connected with the source and is used for transmitting a detection voltage signal to the source.
3. The display panel of claim 1 or 2, wherein, Further comprising: a filter, disposed on the side of the light sensing device away from the substrate substrate, for filtering light other than light of a specific wavelength.
4. The display panel according to claim 3, wherein: the filter comprises a red filter, a green filter and a blue filter; the light sensing device comprises: a first light sensing device, disposed on the side of the red filter close to the substrate substrate; a second light sensing device, disposed on the side of the green filter close to the substrate substrate; a third light sensing device, disposed on the side of the blue filter close to the substrate substrate.
5. The display panel of claim 3, wherein, Further comprising: a light shielding sheet; the light sensing device further comprises a fourth light sensing device, disposed on the side of the light shielding sheet close to the substrate substrate.
6. The display panel of claim 1, wherein, The voltage dividing resistor is a voltage dividing line.
7. The display panel of claim 6, wherein, The light sensing device, the light sensing signal line and the voltage dividing resistor are all disposed in the non-display area of the display panel.
8. The display panel of claim 7, wherein, The voltage dividing line winds at least one round around the display area of the display panel.
9. The display panel of claim 8, wherein, The voltage dividing line is located in the periphery of the light sensing signal line.
10. The display panel of claim 8, wherein, The number of rounds of the voltage dividing line is determined according to at least one of the required voltage dividing resistance value, the thickness of the voltage dividing line, the resistance value of the voltage dividing line, and the width of the voltage dividing line.
11. The display panel of claim 6, wherein, The voltage dividing line adopts a transparent conductive material.
12. A display device comprising: Comprising a display panel, a driving chip and a host, the display panel being the display panel according to any one of claims 1-11; the driving chip is connected with the first light sensing signal line of the display panel and is used for determining the illumination value of ambient light according to the light sensing voltage signal input by the first light sensing signal line; the host is used for automatically adjusting the brightness of the display panel according to the illumination value of the ambient light.