Display device, method for automatically adjusting display screen brightness, and terminal device

Abstract

To provide a display, a method for automatically adjusting the brightness of a display screen of a display, and a terminal device for executing the method for automatically adjusting the brightness of a display screen of a display.SOLUTION: A display, a method for automatically adjusting the brightness of a display screen, and a terminal device are provided. An environmental light detector (1) comprising a light-shielding layer (11) and a photoelectronic sensor (12) is integrated in an operable area of the display. The display comprises a display unit and a controller. The display unit comprises a back plane unit that is provided therein the light-shielding layer (11) provided with light passage holes (111) through which environmental light passes and is provided on its bottom with the photoelectronic sensor (12), a display screen that is provided above the back plane unit, and a display chip that is connected to the display screen. The controller is connected to the photoelectronic sensor and arranged to receive and process a light signal. The display chip adjusts the brightness of the display screen according to conversion of the environmental light.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] REFERENCE TO RELATED APPLICATIONS This application claims priority from Chinese Patent Application No. 201810539342.9, filed with the CNIPA on May 30, 2018, entitled "Display device, method for automatically adjusting display screen brightness, and terminal device," the entire contents of which are incorporated herein by reference.

[0002] An embodiment of the present disclosure relates to a display device, a method for automatically adjusting the brightness of a display screen of a display device, and a terminal device for executing the method for automatically adjusting the brightness of a display screen of the display device. [Background technology]

[0003] The ambient light sensing device is generally disposed in the visible area (i.e., VA, View Area) or black matrix (BM) area of the display panel, which is generally the non-display area (AA area), also known as the border area around the operable area. However, in the above technical solution, the ambient light sensing device needs to occupy an additional corresponding area of the display panel, which is disadvantageous to realizing a borderless panel. Summary of the Invention

[0004] The present disclosure provides a display device, which is advantageous in realizing a borderless panel by integrating an ambient light detection device in a visible area. The present disclosure also provides a method for automatically adjusting the brightness of a display screen of the display device.

[0005] An embodiment of the present disclosure further provides a terminal device for performing the method for automatically adjusting the brightness of a display screen of a display device.

[0006] According to at least one embodiment of the present disclosure, the display device includes an ambient light detection device including a light-shielding layer and a photoelectric sensor, a display unit, and a control device, the display unit including a backplane unit having the light-shielding layer with a light-transmitting hole for passing ambient light therethrough and the photoelectric sensor disposed at a lower part thereof so as to detect a change in the ambient light, a display screen disposed above the backplane unit, and a display chip connected to the display screen, the control device connected to the photoelectric sensor for receiving and processing an optical signal detected by the photoelectric sensor, and the display chip connected to the control device for adjusting the brightness of the display screen according to the change in the ambient light.

[0007] For example, the backplane unit includes a substrate having the light-shielding layer provided on an upper surface thereof and the photoelectric sensor provided on a lower surface thereof, a light-emitting layer provided above the light-shielding layer, an anode provided on a lower surface thereof, and a cathode provided on an upper surface thereof, and the light passing hole is configured so that the light emitted from the light-emitting layer is not emitted from the light passing hole toward the photoelectric sensor after being reflected by the cathode, so as to eliminate interference of the light emitted from the light-emitting layer with the ambient light.

[0008] For example, when light emitted from the light-emitting layer passes through the cathode and is reflected by the light-shielding layer, a reflected light ray intersects with the light-shielding layer at the periphery of the light-passing hole. If a perpendicular line is drawn through the intersection point of the reflected light ray and the light-shielding layer and perpendicular to the plane on which the light-shielding layer is located, the angle between the perpendicular line and the reflected light ray is greater than approximately 30°.

[0009] For example, the backplane unit further includes a back film provided on the lower surface of the substrate and having the photoelectric sensor provided thereunder, and a thin film transistor layer provided between the light-shielding layer and the anode.

[0010] For example, the ambient light detection device further includes a low refractive index layer disposed between the photoelectric sensor and the substrate and configured to transmit the ambient light and to totally reflect the light emitted from the light emitting layer when it is emitted toward the low refractive index layer.

[0011] For example, the low refractive index layer is a silicon dioxide layer, or if the substrate is bonded to the photoelectric sensor and a cavity is defined, the low refractive index layer is an air layer.

[0012] For example, the light passing hole is a through hole that penetrates the light blocking layer along the thickness direction, and the through hole is configured to be circular or polygonal.

[0013] For example, the light-transmitting holes are plural and arranged in an array, and have a maximum radial dimension of about 5 μm to about 15 μm.

[0014] For example, the light-emitting layer has a thickness of about 1 μm or less.

[0015] For example, the display device further includes a protection layer, a package layer, and a pixel definition layer, where the protection layer is disposed on top of the ambient light detection device, the package layer is disposed above the cathode layer, and the pixel definition layer is disposed on the same layer as the anode layer.

[0016] According to at least one embodiment of the present disclosure, there is further provided a method for automatically adjusting the brightness of the display screen of the display device, the automatic adjustment method including the steps of: using the photoelectric sensor to sense ambient light; using the control device to receive an optical signal sensed by the photoelectric sensor and compare the optical signal with a signal stored in the display chip; determining whether the illumination intensity of the ambient light reaches an adjustment threshold; if the adjustment threshold is reached, the control device sending an adjustment signal to the display chip and adjusting the driving current of the display screen via the display chip to change the brightness of the display screen, and continuing to sense the ambient light with the photoelectric sensor; and if the adjustment threshold is not reached, returning to the step of continuing to sense the ambient light with the photoelectric sensor.

[0017] According to at least one embodiment of the present disclosure, there is further provided a terminal device configured to perform a method for adjusting the brightness of a display screen of the display device, the terminal device including a photoelectric sensor, a display unit, and a control device. The photoelectric sensor and the display unit are both electrically connected to the control device, and the display unit includes a display chip and a display screen. The photoelectric sensor is configured to sense ambient light and obtain an optical signal. The control device is configured to compare the optical signal sensed by the photoelectric sensor with a signal stored in the display chip to determine whether the illumination intensity of the ambient light reaches an adjustment threshold, and if so, to send an adjustment signal to the display chip. The display chip is configured to adjust a driving current of the display screen based on the adjustment signal to change the brightness of the display screen.

[0018] For example, the photoelectric sensor is electrically connected to the control device via a sensor flexible circuit board, and the display unit is electrically connected to the control device via a display flexible circuit board.

[0019] In order to enable those skilled in the art to understand the embodiments of the present disclosure more clearly, the embodiments of the present disclosure will be described in more detail below with reference to the drawings. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic diagram of a display device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is another schematic diagram of a display device according to an embodiment of the present disclosure. [Figure 3] FIG. 3 is yet another schematic diagram of a display device according to an embodiment of the present disclosure, where the arrows indicate the propagation direction of light emitted from the light-emitting layer. [Figure 4] FIG. 4 is yet another schematic diagram of a display device according to an embodiment of the present disclosure. [Figure 5] FIG. 5 is a schematic diagram of the optical path propagation of light emitted from a light-emitting layer in a display device according to an embodiment of the present disclosure. [Figure 6] FIG. 6 is a schematic diagram of a display device according to an embodiment of the present disclosure, illustrating another embodiment of an ambient light detection device. [Figure 7] FIG. 7 is a schematic diagram of one of the display devices in FIG. [Figure 8] FIG. 8 shows the light energy sensed by the photoelectric sensor in a bright room in the display device according to the embodiment of the present disclosure. [Figure 9] FIG. 9 shows the light energy sensed by the photoelectric sensor in a slightly dark room (for example, with some lamps turned off) in a display device according to an embodiment of the present disclosure. [Figure 10] FIG. 10 shows the light energy sensed by the photoelectric sensor in a display device according to an embodiment of the present disclosure when the room is slightly dark (e.g., some of the lamps are turned off) and the room is covered with white paper (i.e., the white paper covers the front of the display screen). [Figure 11] FIG. 11 shows the light energy sensed by the photoelectric sensor in the display device according to the embodiment of the present disclosure when the lamp in the room is turned off. [Figure 12] FIG. 12 shows a flowchart of a method for automatically adjusting the brightness of a display screen of a display device according to an embodiment of the present disclosure. [Figure 13] FIG. 13 is a schematic block diagram of a terminal device according to an embodiment of the present disclosure. [Figure 14] FIG. 14 is a schematic diagram of the structure of a terminal device according to an embodiment of the present disclosure. [Figure 15] FIG. 15 is a flowchart illustrating the operation of the control device according to the embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. Of course, the described embodiments are only some of the embodiments of the present disclosure, and not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments that a person skilled in the art can derive without creative work fall within the scope of protection of the present disclosure.

[0022] Unless further defined, technical or scientific terms used in this disclosure have ordinary meanings that can be understood by those skilled in the art. The terms "first," "second," and similar terms used in this disclosure do not denote order, quantity, or importance, but merely distinguish between different components. Similar terms such as "comprise" or "include" mean that the elements or components listed before "comprise" or "include" encompass the elements or components listed after "comprise" or "include" and their equivalents, and do not exclude other elements or components. Similar terms such as "connect" or "coupled" are not limited to physical or mechanical connections, but also include electrical connections, whether direct or indirect. Terms such as "top," "bottom," "left," "right," and the like are merely used to indicate relative positions, and if the absolute positions of the objects being described change, the relative positions may change accordingly.

[0023] The following examples will be described with reference to the drawings, which are merely illustrative and are intended to help understand the present invention, but should not be construed as limiting the present invention.

[0024] A display device 100 according to an embodiment of the present disclosure will be described below with reference to the drawings.

[0025] In the display device 100 according to the embodiment of the present disclosure, the ambient light detection device 1 is integrated in the operable area of the display device 100. By integrating the ambient light detection device 1 in the operable area of the display device 100, the occupation of the border area around the operable area by the ambient light detection device 1 can be reduced, which is advantageous for realizing a borderless full-screen panel.

[0026] An exemplary embodiment of a display device 100 according to the present disclosure will now be described with reference to the drawings.

[0027] 1, the ambient light detection device 1 includes a light-shielding layer 11 and a photoelectric sensor 12. The light-shielding layer 11 may be a metal layer such as a molybdenum layer, a titanium layer, or a silver layer, and the thickness of the light-shielding layer 11 may be appropriately set according to actual needs.

[0028] 2, in combination with FIG. 1, the display device 100 includes a display unit 2 and a control device 3. The display unit 2 includes a backplane unit 21, a display screen 22, and a display chip.

[0029] For example, the light-shielding layer 11 of the ambient light detection device 1 may be provided within a backplane unit 21. The backplane unit 21 has a multi-layer structure, and the light-shielding layer 11 is one layer in the multi-layer structure. The light-shielding layer 11 is provided with light-transmitting holes 111 that allow the ambient light 4 to pass through. Such a configuration is advantageous for accurate detection of ambient light and improves the usability of the display device 100.

[0030] The display screen 22 is provided above the backplane unit 21, and the display chip is connected to the display screen 22. The installation position of the display chip is selectable. The photoelectric sensor 12 is provided at the bottom of the backplane unit 21 to detect the transformation of the ambient light 4. The transformation here refers to, for example, the change in the photocurrent of the sensor due to the illuminance of the ambient light.

[0031] The control device 3 is connected to the photoelectric sensor 12 to receive and process the optical signal sensed by the photoelectric sensor 12. The display chip is connected to the control device 3 to adjust the brightness of the display screen 22 according to the change of the ambient light 4. Thus, by integrating the ambient light sensing device 1 into the operable area of the display device 100, it is advantageous to reduce the occupation of other areas of the display device 100 by the ambient light sensing device 1, and further advantageous to realize a full-screen panel.

[0032] For example, by connecting the control device 3 to the photoelectric sensor 12 and the display chip respectively, the control device 3 can receive and process the optical signal sensed by the photoelectric sensor 12, and compare the optical signal with the signal stored in the display chip, so that the display chip can adjust the brightness of the display screen 22 according to the change of the ambient light 4, which is not only advantageous to saving power but also to improving the user's comfort.

[0033] For example, the control device 3 generally includes a digital signal processing chip (DSP), a printed circuit board (PCB), a CPU, and a display chip (IC).

[0034] The operation process of the control device is shown in Figure 15. The photoelectric sensor detects an ambient light signal, processes the ambient light signal through a DSP (typically an interpolated fuzzy process), and sends the processed data through a PCB to a CPU, which determines whether the brightness (or grayscale) of the display screen needs to be adjusted. If the threshold is not reached, no adjustment is necessary and the current operation is aborted. If the threshold is reached, adjustment is necessary, an adjustment ratio is calculated, and the adjustment data is sent to a display chip (IC), which adds the adjustment data to the display data, which is then transmitted to the display screen for display. For example, the process may further include combining the grayscale control signal with the display raw data and transmitting the final display data for display.

[0035] Also, for example, the DSP may be included inside a CMOS as a digital signal processing chip. The DSP frame includes an ISP (Signal Processing Unit).

[0036] For example, the DSP frame may further include a JPEG encoder (image decoder).

[0037] In the display device 100 according to the embodiment of the present disclosure, the ambient light detection device 1 is integrated into the operable area of the display device 100, which is advantageous in saving screen space and improving screen occupancy rate compared to the prior art. In addition, by connecting the control device 3 to the photoelectric sensor 12 and the display chip respectively, the display device 100 can adjust the brightness of the display screen 22 according to the conversion of the ambient light 4, thereby improving user comfort and saving energy.

[0038] For example, as shown in FIGS. 3 and 4, the backplane unit 21 includes a substrate 211, a light-emitting layer 212, an anode 213, and a cathode 214.

[0039] The light-shielding layer 11 is provided on the upper surface of the substrate 211, the photoelectric sensor 12 is provided on the bottom of the substrate 211 to detect the conversion of ambient light 4, the light-emitting layer 212 is provided above the light-shielding layer 11, the anode 213 is provided on the lower surface of the light-emitting layer 212, and the cathode 214 (e.g., a metal cathode) is provided on the upper surface of the light-emitting layer 212.

[0040] The light-emitting layer 212 may be an organic light-emitting layer (i.e., EL, Emitting Layer), and the light passing hole 111 is configured so that the light emitted from the light-emitting layer 212 is not emitted from the light passing hole 111 toward the photoelectric sensor 12 after being reflected by the cathode 214, so as to eliminate interference of the light emitted from the light-emitting layer 212 with the ambient light 4. In this way, it is advantageous to avoid interference of the light emitted from the light-emitting layer 212 itself with the ambient light 4, and the accuracy of ambient light detection is improved.

[0041] The light-shielding layer 11 can block a portion of light, for example, the light-shielding layer 11 can block the light emitted from the light-emitting layer 212, thereby reducing the interference of the light emitted from the light-emitting layer 212 with the ambient light 4, improving the detection accuracy of the photoelectric sensor 12, and further advantageously allowing the display chip to adaptively adjust the brightness of the display screen 22.

[0042] For example, the light passing hole 111 is a through hole that penetrates the light blocking layer 11 along the thickness direction, and the through hole is configured as a circle or a polygon, which is advantageous for increasing the light transmittance and further preventing the light emitted from the light emitting layer 212 itself from interfering with the ambient light 4, thereby improving the accuracy of ambient light detection.

[0043] For example, a plurality of light passing holes 111 may be arranged in an array, which is advantageous in increasing the light transmittance and in preventing the light emitted from the light emitting layer 212 itself from interfering with the ambient light 4, thereby enabling accurate detection of the ambient light and better adjusting the brightness of the screen.

[0044] To increase the amount of light transmitted, the density of the light passage holes 111 can be maximized. For example, one light passage hole 111 can be formed adjacent to each sub-pixel. By designing the ambient light detection device 1 in the operable area, the area of the display screen 22 can be increased. A larger screen occupancy rate can be achieved.

[0045] For example, the operable area may be located in the display area. For example, an array of holes may be formed on the entire screen, or a hole or an array of holes may be formed in a certain area of the screen. If formed on the entire screen, the entire screen becomes the operable area. If formed only locally, since the sensor is small, it is necessary to place the sensor in the area where the hole array is formed to be effective, and therefore this local area becomes the operable area.

[0046] For example, by integrating the ambient light detection device 1 into the operable area and automatically adjusting the screen brightness according to the ambient light, it is possible to save space, increase the screen area, and improve the screen occupancy rate, which is advantageous for realizing a full-screen panel.

[0047] Furthermore, by providing a light-shielding layer 11 and opening light-transmitting holes 111 in the light-shielding layer 11, it is possible to prevent the light emitted from the light-emitting layer 212 itself from interfering with the photoelectric sensor 12 that detects the ambient light 4, thereby enabling accurate detection of ambient light and realizing full-screen fingerprint recognition. Note that fingerprint recognition can be performed by referring to a conventional fingerprint recognition method, and therefore will not be described in detail here.

[0048] Alternatively, the maximum radius of the light passing hole 111 is about 5 μm to about 15 μm, which is advantageous in increasing the light transmittance and in preventing the light emitted from the light emitting layer 212 itself from interfering with the ambient light 4, thereby enabling accurate detection of the ambient light.

[0049] The maximum radial dimension of the light passing hole 111 may be, for example, about 5 μm, about 8 μm, about 10 μm, or about 15 μm.

[0050] Here, it should be noted that if the light passing hole 111 is a circular hole, the maximum radial dimension of the light passing hole 111 refers to the diameter of the circular hole, and if the light passing hole 111 is a polygonal hole, the maximum radial dimension of the light passing hole 111 refers to the diameter of the circumscribing circle of the light passing hole 111, and the minimum radial dimension of the light passing hole 111 refers to the diameter of the inscribing circle of the light passing hole 111, which can be understood by those skilled in the art.

[0051] Alternatively, the thickness of the light-emitting layer 212 may be about 1 μm or less, which makes the structure of the display device 100 lighter, thinner, and more compact.

[0052] As shown in Figures 3 and 4, the display device 100 further includes a protective layer 5 (e.g., a protective glass cover), a package layer 6, and a pixel definition layer 7. For example, the protective layer 5 may be provided on the outermost side of the display screen, and the display screen and the ambient light detection device 1, etc., are protected to a certain extent through the protective layer 5, which is advantageous for ensuring the accuracy of ambient light detection and extending the service life of the display device 100.

[0053] The package layer 6 may be provided above the cathode 214, and the pixel defining layer 7 may be located in the same layer as the anode 213. As shown in Figure 4, the display device may further include a polarizer 23 and a touch panel 24. The touch panel 24 may be adhered to the package layer 6 with an optical adhesive. For example, a protective layer 5 may be provided on the polarizer 23.

[0054] Alternatively, referring to FIG. 3 and combining it with FIG. 4, the backplane unit 21 further includes a back film 215 and a thin film transistor layer 216. The back film 215 is disposed on the lower surface of the substrate 211, and the photoelectric sensor 12 is disposed on the bottom of the back film 215. The back film 215 may be glass or thermoplastic polyester PET (Polyethylene terephthalate), etc. The thin film transistor layer 216 may be disposed between the light-shielding layer 11 and the anode 213. The display chip is connected to the thin film transistor layer 216, and the brightness of each pixel can be adjusted by the display chip. When light emitted from the light-emitting layer 212 passes through the cathode 214 and is reflected by the light-shielding layer 11, if the reflected light ray intersects with the light-shielding layer 11 at the periphery of the light-passing hole 111 (for example, the projection of the light-passing hole 111 on the light-shielding layer 11 intersects with the reflected light ray), if a perpendicular line is drawn through the intersection point between the reflected light ray and the light-shielding layer 11 and perpendicular to the plane on which the light-shielding layer 11 is located, the angle between the perpendicular line and the reflected light ray is greater than approximately 30°. This is advantageous in that it avoids the interference of light emitted from the light-emitting layer 212 itself with the ambient light 4, thereby making the detection of ambient light more accurate.

[0055] For example, if light emitted from the light-emitting layer 212 has an intersection with the cathode 214 and is reflected toward the light-shielding layer 11 through the intersection, the projection of the light-transmitting hole 111 on the light-shielding layer 11 is circular and has endpoints at both ends of the diameter of the light-transmitting hole 111, the intersection and the endpoints are connected to form a first connecting line, and a perpendicular line perpendicular to the plane on which the light-shielding layer 11 is located is drawn through the endpoints to form a second connecting line, the angle between the first connecting line and the second connecting line is greater than approximately 30°.

[0056] For example, combining Figure 3 with reference to Figure 5, a point on the edge of the upper surface of the light-emitting layer 212 is denoted as A1, a point on the edge of the lower surface of the light-emitting layer 212 is denoted as A3, and a point on an edge between the upper and lower surfaces of the light-emitting layer 212 is denoted as A2, and the endpoints include a first endpoint B1 and a second endpoint B2.

[0057] When the light emitted from point A1 exits through the first end point B1, a perpendicular line passing through the first end point B1 and perpendicular to the plane on which the light-shielding layer 11 is located has a first intersection point O1 with the cathode 214, and forms a first angle ∠A1B101, or θ1, which is greater than approximately 30°.

[0058] For example, if the intersections further include a second intersection O2, a third intersection O3, and a fourth intersection O4, and the light emitted from point A2 passes through the second intersection O2 and exits from the first terminal point B1, the second angle formed is ∠O2B1O1, or θ2, which is greater than approximately 30°.

[0059] When the light emitted from point A3 passes through the third intersection point O3 and exits from the second end point B2, the perpendicular line passing through the second end point B2 has a fourth intersection point O4 with the cathode 214, and the third included angle is ∠O3B2O4, or θ3, which is approximately 30°.

[0060] For example, ambient light 4 passes through the light passing hole 111 and enters the photoelectric sensor 12, where it is detected. The photoelectric sensor 12 detects the integrated photosensitive energy. The control device 3 is connected to the photoelectric sensor 12 and the display chip, respectively, to determine the intensity of the ambient light 4, and automatically adjusts the brightness of the display screen 22 via the display chip. In addition, the light passing hole 111 can also function to block light emitted by the light-emitting layer 212 inside the display device 100, for example, an OLED (Organic Light-Emitting Diode), thereby avoiding erroneous detection caused by stray light inside the display device 100 interfering with the detection of the photoelectric sensor 12.

[0061] As shown in FIG. 3, in order for the light transmitting hole 111 of the light-shielding layer 11 to eliminate the light emitted from the light-emitting layer 212 itself, the angles θ1, θ2, and θ3 are all required to be greater than approximately 30°, for example, 38°, where θ1, θ2, and θ3 satisfy the following formula:

number

[0062] A refers to the vertical distance from the second light-emitting point to the intersection point of the reflected light and the light-shielding layer, B refers to the vertical distance from the first light-emitting point to the intersection point of the light or reflected light and the light-shielding layer, E refers to the vertical distance from the bottom surface of the reflective layer to the top surface of the light-shielding layer, and F refers to the vertical distance from the bottom surface of the light-emitting layer to the top surface of the light-shielding layer.

[0063] It should be noted that the thickness of the light-emitting layer 212 shown in FIGS. 3 to 5 is very thin, and for the sake of convenience, the structure of the light-emitting layer 212 and some light rays are only shown in the figures.

[0064] According to another embodiment of the present disclosure, the ambient light sensing device 1 may further include a low refractive index layer 13 .

[0065] According to some embodiments of the present disclosure, as shown in FIG. 6 , the ambient light detection device 1 may further include a low refractive index layer 13 disposed between the photoelectric sensor 12 and the substrate 211, configured to transmit the ambient light and to totally reflect the light emitted from the light-emitting layer 212 when it is emitted toward the low refractive index layer 13.

[0066] For example, as shown in FIG. 7, a back film 215 may be provided on the lower surface of the substrate 211, and the low refractive index layer 13 may be provided between the photoelectric sensor 12 and the back film 215.

[0067] Alternatively, the low refractive index layer 13 is a silicon dioxide layer or an adhesive layer between the substrate 211 and the photoelectric sensor 12. A cavity may be defined between the substrate 211 and the photoelectric sensor 12, in which case the low refractive index layer 13 may be an air layer. The form of the low refractive index layer 13 can be selected as needed. As a result, when a portion of the light emitted from the light-emitting layer 212 is reflected through the cathode 214 and then emitted toward the photoelectric sensor 12 through the light-transmitting hole 111, the light can be totally reflected by the low refractive index layer 13, which is advantageous in further reducing the interference of the light emitted from the light-emitting layer 212 itself with the ambient light 4 and further advantageous in accurately detecting ambient light.

[0068] By rationally setting the position of the light passing hole 111, the light emitted from the light emitting layer 212 is totally reflected when it is emitted through the light passing hole 111 toward the photoelectric sensor 12, but the ambient light 4 is not totally reflected when it passes through the light passing hole 111 and is emitted toward the low refractive index layer 13, and therefore the low refractive index layer 13 basically has no effect on the ambient light 4.

[0069] For example, ambient light 4 can pass through the low refractive index layer 13 and reach the surface of the photoelectric sensor 12, but the self-luminous light emitted from inside the display device 100 also undergoes internal reflection, most of which is blocked by the light-shielding layer 11 and does not cause interference. Even if some of the light emitted from the light-emitting layer 212 enters the light transmission hole 111 of the light-shielding layer 11, the angle of incidence is large and total reflection occurs at the low reflectivity layer 13, preventing the light from reaching the surface of the photoelectric sensor 12. Therefore, what the photoelectric sensor 12 detects is mostly ambient light 4, enabling accurate detection. This allows the brightness of the display screen 22 to change in accordance with changes in the brightness of the ambient light, without being affected by the display screen of the display device.

[0070] FIG. 8 shows the light energy sensed by the photoelectric sensor 12 when the room is bright. FIG. 9 and FIG. 10 show the light energy sensed by the photoelectric sensor 12 when the room is slightly dark. FIG. 11 shows the light energy sensed when the room is turned off. All tests are performed with the screen turned on (i.e., the display screen is turned on). As can be seen, the light energy sensed by the photoelectric sensor 12 changes with the change in the ambient light 4, and the display screen being turned on does not interfere with the ambient light 4.

[0071] As shown in FIG. 12 , an embodiment of the present disclosure further provides a method for automatically adjusting the brightness of a display screen of the display device. The photoelectric sensor senses ambient light, and the control device receives an optical signal sensed by the photoelectric sensor and compares the optical signal with a signal stored in the display chip. The control device determines whether the illumination intensity of the ambient light reaches an adjustment threshold (the adjustment threshold can be adaptively set). If the adjustment threshold is reached, the control device sends an adjustment signal to the display chip to adjust the driving current of the display screen via the display chip to change the brightness of the display screen, and continues to sense the ambient light using the photoelectric sensor. If the adjustment threshold is not reached, the process returns to the step of continuing to sense the ambient light using the photoelectric sensor. This allows the brightness of the display screen to be automatically adjusted according to the change in ambient light, and is advantageous in avoiding interference between light emitted from the light-emitting layer itself and the ambient light, thereby ensuring accurate detection of ambient light.

[0072] For example, the optical signal has a corresponding relationship with a signal stored in the display chip, and if the optical signal does not match the signal stored in the display chip, it can be determined that the illumination intensity of the ambient light reaches an adjustment threshold.

[0073] Here, the control device and the photoelectric sensor may be installed independently, or the control device may integrate a comparison module and an analysis module equipped with a photoelectric sensor.

[0074] 13 in combination with FIGS. 14 and 15, an embodiment of the present disclosure further provides a terminal device 200 that performs the method for adjusting the brightness of a display screen of a display device. The terminal device 200 includes a photoelectric sensor 210, a display unit 230, and a control device 220.

[0075] The photoelectric sensor 210 and the display unit 230 are both electrically connected to the control device 220 , and the display unit 230 includes a display chip 231 and a display screen 232 .

[0076] For example, as shown in FIG. 14, the photoelectric sensor 210 is electrically connected to the control device 220 via a sensor flexible circuit board (FPC) 218, and the display unit 230 having a display chip 231 and a display screen 232 is electrically connected to the control device 220 via a display FPC.

[0077] For example, the photoelectric sensor 210 senses ambient light to obtain an optical signal, and the control device 220 compares the optical signal sensed by the photoelectric sensor 210 with the signal stored in the display chip 231 to determine whether the illumination intensity of the ambient light reaches an adjustment threshold. If the illumination intensity reaches the adjustment threshold, the control device 220 sends an adjustment signal to the display chip 231, and the display chip 231 adjusts the driving current of the display screen 232 based on the adjustment signal to change the brightness of the display screen 232.

[0078] The terminal device 200 according to the embodiment can adaptively adjust the brightness of the display screen 232 according to the change of the ambient light, which is advantageous for improving the user's comfortable usage experience.

[0079] In order to more clearly show the configuration of the terminal device 200, features of the terminal device 200 that have the same names as the display device 100 are denoted by different reference numerals.

[0080] Other structures and operations of the display device according to the embodiment of the present disclosure can be referred to in general design, and will not be described in detail here.

[0081] In the description herein, a description using reference terms such as "one embodiment," "some embodiments," "examples," or "some examples" means that the features, structures, materials, or characteristics described in the embodiment or example are included in at least one embodiment or example of the present disclosure. In the present specification, general descriptions of the above terms are not necessarily made with respect to the same embodiment or example. In addition, the described features, structures, materials, or characteristics may be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, unless mutually inconsistent, those skilled in the art may combine or combine different embodiments or examples and features of different embodiments or examples described herein.

[0082] The above contents are merely exemplary embodiments used to explain the principles of the present disclosure, and the embodiments of the present disclosure are not limited thereto. Those skilled in the art can make various modifications and improvements without departing from the principles of the embodiments of the present disclosure, and these modifications and improvements should be considered to belong to the protection scope of the present disclosure.

[0083] [Section 1] A display device comprising: an ambient light detection device including a light-shielding layer and a photoelectric sensor; a display unit; and a control device, wherein the display unit: a backplane unit having the light-shielding layer therein, the light-transmitting hole for transmitting ambient light, and the photoelectric sensor disposed at a lower portion thereof for detecting the conversion of the ambient light; a display screen provided above the backplane unit; a display chip connected to the display screen, The control device is connected to the photoelectric sensor and receives and processes an optical signal sensed by the photoelectric sensor, and the display chip is connected to the control device and adjusts the brightness of the display screen according to the change in ambient light. [Section 2] The backplane unit includes: a substrate having the light-shielding layer provided on an upper surface thereof and the photoelectric sensor provided on a lower surface thereof; a light-emitting layer provided above the light-shielding layer; an anode provided on the lower surface of the light-emitting layer; a cathode provided on an upper surface of the light-emitting layer, The display device described in item 1, wherein the light passing hole is configured so that light emitted from the light-emitting layer is not emitted toward the photoelectric sensor through the light passing hole after being reflected by the cathode, so as to eliminate interference of light emitted from the light-emitting layer with the ambient light. [Section 3] 3. The display device according to claim 2, wherein when light emitted from the light-emitting layer passes through the cathode and is reflected by the light-shielding layer, a reflected light ray intersects with the light-shielding layer at the periphery of the light-passing hole, and when a perpendicular line is drawn through the intersection of the reflected light ray and the light-shielding layer and perpendicular to a plane on which the light-shielding layer is located, the angle between the perpendicular line and the reflected light ray is greater than approximately 30°. [Section 4] The backplane unit includes: a back film provided on the lower surface of the substrate, the back film having the photoelectric sensor provided thereunder; 3. The display device according to item 2, further comprising a thin film transistor layer provided between the light-shielding layer and the anode. [Section 5] 5. The display device according to any one of items 2 to 4, wherein the ambient light detection device further comprises a low refractive index layer provided between the photoelectric sensor and the substrate, the low refractive index layer being configured to pass the ambient light and to totally reflect the light emitted from the light-emitting layer when it is emitted toward the low refractive index layer. [Section 6] 6. The display device according to claim 5, wherein the low refractive index layer is a silicon dioxide layer, or, when the substrate is bonded to the photoelectric sensor and a cavity is defined, the low refractive index layer is an air layer. [Section 7] 7. The display device according to any one of items 1 to 6, wherein the light passing hole is a through hole that passes through the light blocking layer along the thickness direction, and the through hole is configured as a circle or a polygon. [Section 8] 8. The display device according to item 7, wherein the light passing holes are plural and arranged in an array, and have a maximum radial dimension of about 5 μm to about 15 μm. [Section 9] 9. The display device according to any one of items 1 to 8, wherein the light-emitting layer has a thickness of about 1 μm or less. [Section 10] 10. The display device according to any one of items 2 to 9, further comprising a protective layer disposed on top of the ambient light detection device, a package layer disposed above the cathode layer, and a pixel definition layer disposed on the same layer as the anode layer. [Section 11] A method for automatically adjusting the luminance of a display screen of the display device according to any one of items 1 to 10, the photoelectric sensor sensing ambient light; The control device receives the optical signal sensed by the photoelectric sensor and compares the optical signal with the signal stored in the display chip; determining whether the illumination intensity of the ambient light reaches an adjustment threshold; When the adjustment threshold is reached, the control device sends an adjustment signal to the display chip to adjust the driving current of the display screen through the display chip to change the brightness of the display screen, and continues to sense the ambient light through the photoelectric sensor; If the adjustment threshold is not reached, the method returns to the step of continuing to sense ambient light with the photoelectric sensor. [Section 12] A terminal device, The terminal device is arranged to perform the method for adjusting the brightness of the display screen of a display device described in paragraph 11, and includes a photoelectric sensor, a display unit, and a control device, the photoelectric sensor and the display unit are both electrically connected to the control device, and the display unit includes a display chip and a display screen. the photoelectric sensor is positioned to sense ambient light and obtain an optical signal; the control device is configured to compare the optical signal sensed by the photoelectric sensor with the signal stored in the display chip to determine whether the illumination intensity of the ambient light reaches an adjustment threshold, and if so, to send an adjustment signal to the display chip; The terminal device is configured such that the display chip adjusts a drive current of the display screen based on the adjustment signal to change the brightness of the display screen. [Section 13] 13. The terminal device according to claim 12, wherein the photoelectric sensor is electrically connected to the control device via a sensor flexible circuit board, and the display unit is electrically connected to the control device via a display flexible circuit board. [Explanation of symbols]

[0084] 1. Ambient light detector 2 Display Unit 3. Control device 4 Ambient light 5 Protective layer 6 Packaging Layer 7 Pixel Definition Layer 11 Light blocking layer 12 Photoelectric Sensor 13 Low refractive index layer 21 Backplane Unit 22 Display screen 23 Polarizer 24 Touch Panel 100 display device 111 Light passing hole 200 Terminal Device 210 Photoelectric Sensor 211 Substrate 212 Light-emitting layer 213 Anode 214 Cathode 215 Back Film 216 Thin Film Transistor Layer 218 Sensor Flexible Circuit Board 220 Control device 230 Display Unit 231 Display Chip 232 Display screen

Claims

1. A substrate; a thin film transistor layer located on one side of the substrate and including a thin film transistor; a light emitting element located on one side of the thin film transistor layer away from the substrate, the light emitting element including an anode, a light emitting layer, and a cathode, which are sequentially disposed away from the substrate, and connected to the thin film transistor; a light-shielding layer located between the substrate and the thin film transistor layer, the light-shielding layer including a light-passing hole arranged to pass ambient light, wherein an orthogonal projection of the light-passing hole onto the substrate is located between orthogonal projections of two adjacent light-emitting elements onto the substrate, and an orthogonal projection of the thin film transistor onto the substrate and an orthogonal projection of the light-emitting element onto the substrate overlap with an orthogonal projection of the light-shielding layer onto the substrate; a photoelectric sensor located on one side of the substrate away from the light-shielding layer, the photoelectric sensor being arranged to detect a change in photocurrent of the photoelectric sensor due to illuminance of ambient light.

2. 2. The display device according to claim 1, wherein the light passing hole is configured so that light emitted from the light emitting layer and reflected by the cathode is blocked by the light blocking layer and does not pass through the light passing hole.

3. 3. The display device according to claim 2, wherein when light emitted from the light-emitting layer is reflected by the cathode to the light-shielding layer, a reflected light ray intersects with the light-shielding layer at the periphery of the light-passing hole, and when a perpendicular line is drawn through the intersection of the reflected light ray and the light-shielding layer and perpendicular to a plane on which the light-shielding layer is located, the angle between the perpendicular line and the reflected light ray is greater than approximately 30°.

4. The display device further includes a backplane unit, the backplane unit including the substrate, the light-emitting layer, the anode, the cathode, and the thin film transistor layer, the backplane unit including: a back film provided on one side of the substrate away from the light-shielding layer, 3. The display device according to claim 2, wherein the photoelectric sensor is located on one side of the back film away from the light-shielding layer, and an orthogonal projection of the photoelectric sensor onto the substrate overlaps with an orthogonal projection of the light-transmitting hole onto the substrate.

5. 5. The display device according to claim 4, further comprising a low refractive index layer provided between the photoelectric sensor and the substrate and positioned on one side of the back film away from the substrate, the low refractive index layer configured to transmit the ambient light and to totally reflect the light emitted from the light-emitting layer when it is emitted toward the low refractive index layer.

6. 6. The display device of claim 5, wherein the low refractive index layer is a silicon dioxide layer, or when the substrate is bonded to the photoelectric sensor and a cavity is defined, the low refractive index layer is an air layer.

7. The display device according to claim 1 , wherein the light passing hole is a through hole that penetrates the light blocking layer along a thickness direction, and the through hole is configured to be circular or polygonal.

8. 2. The display device according to claim 1, wherein the light passing holes are a plurality of holes arranged in an array, and the maximum radius dimension of the holes is about 5 μm to about 15 μm.

9. 2. The display device according to claim 1, wherein the thickness of the light-emitting layer is about 1 [mu]m or less.

10. 2. The display device of claim 1, further comprising: a pixel definition layer located on one side of the anode away from the substrate and covering a periphery of the anode, the pixel definition layer having an opening for accommodating the light-emitting layer.

11. Further comprising a protective layer, a touch panel, and a package layer; the package layer is located on one side of the cathode away from the substrate, the protective layer is located on one side of the package layer away from the substrate, The display device according to claim 1 , wherein the touch panel is located between the protective layer and the package layer.

12. Further comprising a control device and a display chip connected to the control device, The display device according to claim 1 , wherein the control device is connected to the photoelectric sensor to receive and process the optical signal sensed by the photoelectric sensor, and the display chip is configured to adjust a driving current of the display device.

13. The sensor further comprises a flexible circuit board (FPC), The display device according to claim 12 , wherein the photoelectric sensor is electrically connected to the control device via the sensor flexible circuit board.

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