Display module and display device

Abstract

The invention provides a display module and a display device, and belongs to the technical field of display. The display module comprises a plurality of light-emitting elements and a plurality of sets of ambient light sensors which are located on a display panel, and each set of ambient light sensor comprises a plurality of photosensitive transistors which are connected in parallel so as to output a light brightness sensing signal reflecting the brightness under the control of a photosensitive control signal transmitted by a brightness control circuit. The brightness control circuit controls the brightness of the plurality of light-emitting elements based on the light brightness sensing signal. Therefore, the self-adaptive adjustment of the display brightness can be realized.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display module and a display device. Background Art

[0002] With the development of display technology, current display devices are mostly provided with an ambient light sensor (ALS) to sense the brightness of ambient light, so that the display device can adaptively adjust the display brightness based on the brightness of ambient light.

[0003] However, for small-sized display devices (such as many wearable devices), considering the cost and full-screen requirements, it is usually impossible to open a hole on the front of the display panel or add an external ALS to sense the ambient light brightness. This also causes most small-sized display devices to be unable to adaptively adjust the display brightness based on the ambient light brightness. Summary of the invention

[0004] A display module and a display device are provided, which can solve the problem that most small-sized display devices in the related art cannot adaptively adjust the display brightness based on the ambient light brightness. The technical solution is as follows:

[0005] In one aspect, a display module is provided, the display module comprising:

[0006] A display panel having a display area and a peripheral area at least partially surrounding the display area;

[0007] A plurality of light emitting elements are located in the display area;

[0008] At least two groups of ambient light sensors are located in the peripheral area, each group of the ambient light sensors includes: a bright state sensor and a dark state sensor connected in parallel, and the bright state sensor and the dark state sensor each include: a plurality of photosensitive transistors connected in parallel;

[0009] The brightness control circuit is electrically connected to the at least two groups of ambient light sensors and the multiple light-emitting elements, respectively, and is used to: transmit photosensitivity control signals to the at least two groups of ambient light sensors, receive light brightness sensing signals transmitted by the at least two groups of ambient light sensors in response to the photosensitivity control signals, and control the light brightness of the multiple light-emitting elements based on the light brightness sensing signals transmitted by at least one group of the ambient light sensors.

[0010] Optionally, the at least two groups of ambient light sensors are used to alternately and intermittently transmit the light brightness sensing signal based on the photosensitivity control signal.

[0011] Optionally, the display module further comprises: at least two switch transistors corresponding to the at least two groups of ambient light sensors one by one, each of the switch transistors being connected between the brightness control circuit and a corresponding group of ambient light sensors, and each of the switch transistors being used to: receive a switch control signal, and in response to the switch control signal, control the on / off of the brightness control circuit and the corresponding group of ambient light sensors;

[0012] The potential of the switch control signal is an effective potential used to control the brightness control circuit to be connected to a corresponding group of the ambient light sensors, so that the light sensing control signal provided by the ambient light sensor is transmitted to the ambient light sensor, and the potential of the switch control signal is an invalid potential used to control the brightness control circuit to be disconnected from the corresponding group of the ambient light sensors;

[0013] Furthermore, among the at least two switch transistors, there is an interval between the effective potentials of the switch control signals received by any two of the switch transistors, so that the at least two groups of ambient light sensors transmit the light brightness sensing signals alternately and intermittently based on the photosensitivity control signal.

[0014] Optionally, the display module includes: two groups of the ambient light sensors, and two switch transistors corresponding to the two groups of the ambient light sensors one by one, and the interval between the two groups of the ambient light sensors transmitting the light brightness sensing signals is 50 milliseconds.

[0015] Optionally, the brightness control circuit is used for:

[0016] When a difference between the light brightness sensing signals transmitted by the two groups of ambient light sensors is less than a difference threshold, controlling the light brightness of the plurality of light emitting elements based on the light brightness sensing signals transmitted by the two groups of ambient light sensors;

[0017] When the difference between the light brightness sensing signals transmitted by the two groups of ambient light sensors is greater than or equal to the difference threshold, the light brightness of the multiple light-emitting elements is controlled based on the light brightness sensing signal transmitted by one of the groups of ambient light sensors, wherein one group of ambient light sensors is the group of ambient light sensors that transmits a relatively larger light brightness sensing signal among the two groups of ambient light sensors.

[0018] Optionally, the gate of each of the switching transistors is used to receive the switching control signal, the source of each of the switching transistors is connected to the brightness control circuit, and the drain of each of the switching transistors is connected to a corresponding group of the ambient light sensors.

[0019] Optionally, the display module further comprises: a flexible printed circuit board and an array substrate;

[0020] The at least two switch transistors are located on the array substrate or the flexible printed circuit board.

[0021] Optionally, the brightness control circuit includes: a display driver chip and a light-emitting driver circuit;

[0022] The display driver chip is connected to the at least two groups of ambient light sensors and is used to transmit the light sensing control signal to the at least two groups of ambient light sensors, receive the light brightness sensing signal transmitted by the at least two groups of ambient light sensors in response to the light sensing control signal, and convert the light brightness sensing signal transmitted by at least one group of the ambient light sensors into a light brightness value; wherein different light brightness values ​​correspond to different light emitting drive signals;

[0023] The light-emitting driving circuit is connected to the plurality of light-emitting elements and is used to drive the plurality of light-emitting elements to emit light based on a light-emitting driving signal corresponding to the light brightness value, so as to control the light brightness of the plurality of light-emitting elements.

[0024] Optionally, the display driver chip is further used to connect to a client, and to transmit the determined light brightness value to the client, so that the client can determine a light driving signal corresponding to the light brightness value, and transmit the light driving signal to the connected light driving circuit;

[0025] Alternatively, the display driver chip is also connected to the light-emitting driver circuit, and the display driver chip is further used to: determine a light-emitting driver signal corresponding to the light brightness value, and transmit the light-emitting driver signal to the light-emitting driver circuit.

[0026] Optionally, the display driver chip is further externally mounted with a flash memory, and a communication connection is established between the display driver chip and the flash memory;

[0027] In the case where the display driver chip is used to determine the light driving signal corresponding to the light brightness value, the different light driving signals corresponding to different brightness values ​​are stored in the flash memory in the form of a lookup table for the display driver chip to call.

[0028] Optionally, the peripheral area surrounds the display area, and the peripheral area includes: a first peripheral area and a second peripheral area located at opposite sides of the display area in a first direction;

[0029] The display driver chip is located in the first peripheral area;

[0030] In the case where the display module includes two groups of ambient light sensors, one group of ambient light sensors is located at the center of the second peripheral area, and the other group of ambient light sensors is located in the first peripheral area and on either side of the display driver chip in the second direction, or both groups of ambient light sensors are located at the center of the second peripheral area, and the second direction intersects with the first direction.

[0031] Optionally, when both groups of ambient light sensors are located at the center of the second peripheral area, along the second direction, the dark state sensors and the bright state sensors included in one group of ambient light sensors are arranged in sequence with the bright state sensors and the dark state sensors included in the other group of ambient light sensors.

[0032] Optionally, the display driver chip is connected to the source and drain of multiple photosensitive transistors connected in parallel in each group of the ambient light sensors, and is used to transmit the photosensitivity control signal to the source of the multiple photosensitive transistors, and receive the light brightness sensing signal transmitted by the drain of the multiple photosensitive transistors.

[0033] In another aspect, a display device is provided, the display device comprising: a power supply, and the display module as described in the above aspect;

[0034] The power supply is connected to the display module and is used to supply power to the display module.

[0035] Optionally, the display device is a wearable device.

[0036] In summary, the beneficial effects brought about by the technical solution provided by this application may at least include:

[0037] A display module and a display device are provided. The display module includes a plurality of light-emitting elements and a plurality of groups of ambient light sensors located on a display panel, and each group of ambient light sensors includes a plurality of photosensitive transistors connected in parallel, so as to output a light brightness sensing signal reflecting the brightness under the control of a photosensitive control signal transmitted by a brightness control circuit, so that the brightness control circuit controls the light brightness of the plurality of light-emitting elements based on the light brightness sensing signal. In this way, adaptive adjustment of display brightness can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1is a structural schematic diagram of a display module provided in an embodiment of the present application;

[0040] Figure 2 is a schematic diagram of the dimensions of an ambient light sensor provided in an embodiment of the present application;

[0041] Figure 3 is a schematic diagram of the structure of another display module provided in an embodiment of the present application;

[0042] Figure 4 This is a schematic diagram of the connection between a display driver chip and a photosensitive transistor provided in an embodiment of the present application;

[0043] Figure 5 This is a schematic diagram of a connection between a display driver chip and a flash memory provided in an embodiment of the present application;

[0044] Figure 6 is a schematic diagram of the structure of two groups of ambient light sensors provided in an embodiment of the present application;

[0045] Figure 7 is a schematic diagram of a display module including a switching transistor provided in an embodiment of the present application;

[0046] Figure 8 This is a schematic diagram of the connection between a display driver chip and a switch transistor provided in an embodiment of the present application;

[0047] Fig. 9 This is a signal timing diagram of a driving switch transistor provided in an embodiment of the present application;

[0048] Fig.10 is a schematic diagram of the location of an ambient light sensor provided in an embodiment of the present application;

[0049] Fig.11 is a schematic diagram of the location of another ambient light sensor provided in an embodiment of the present application;

[0050] Fig.12 This is a schematic diagram of another setting position of an ambient light sensor provided in an embodiment of the present application;

[0051] Fig.13 This is a schematic diagram of the location of another ambient light sensor provided in an embodiment of the present application;

[0052] Fig.14 This is a schematic diagram of the location of another ambient light sensor provided in an embodiment of the present application;

[0053] Fig.15 This is a schematic diagram of the location of another ambient light sensor provided in an embodiment of the present application;

[0054] Fig.16It is a structural schematic diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the present application clearer, the following will further describe the implementation mode of the present application in detail with reference to the accompanying drawings. The key terms involved in the embodiments of the present application are introduced as follows:

[0056] Ambient light sensor ALS: A sensor that can sense the brightness or intensity of ambient light and convert it into an electrical signal, which is widely used in many fields. Of course, in some other embodiments, the ambient light sensor ALS is not limited to sensing ambient light.

[0057] Bright state sensor: It is more sensitive to higher light intensity and can produce more obvious electrical signal changes in bright environments. It is often used in scenes that require detection of higher light brightness. It is also called white (W) state sensor, referred to as W.

[0058] Dark state sensor: It is more sensitive to weaker light intensity and can produce more obvious electrical signal changes in low light or dark environments. It is often used in scenes where weak light brightness needs to be detected. It is also called dark (W) state sensor, referred to as D.

[0059] Phototransistor: A semiconductor device that is sensitive to light signals and can convert light signals into electrical signals (e.g., leakage current). It mainly includes photodiodes and phototransistors. Phototransistors are often used in ALS so that ALS can reliably sense the brightness of ambient light. In general, the stronger the light brightness, the greater the leakage current output by the phototransistor.

[0060] Switching transistor: A semiconductor device used to control the on and off of a circuit. It mainly controls the on and off of the current between the collector and the emitter (for a transistor) or the drain and the source (for a field effect transistor) by controlling the electrical signal of the base (for a transistor) or the gate (for a field effect transistor). Field effect transistors are, for example, thin-film transistors (TFTs) or metal-oxide-semiconductor (MOS) field effect transistors, also known as MOS transistors.

[0061] Moreover, photosensitive transistors and switch transistors generally include P-type transistors and N-type transistors. The P-type transistor is turned on when it receives a valid potential of a low potential, and is turned off when it receives an invalid potential of a high potential. The N-type transistor is turned on when it receives a valid potential of a high potential, and is turned off when it receives an invalid potential of a low potential. Here, high potential and low potential are relative, and represent a potential state quantity, not a potential size.

[0062] Faced with the problem that most current small-sized display modules cannot adaptively adjust the display brightness based on the brightness of ambient light, that is, products without automatic screen brightness adjustment function, the embodiment of the present application provides a new display module. The ALS is optimized in the display module so that the ALS can be integrated on the display panel without opening a hole on the front of the screen to place the ALS. This ensures a full screen while also achieving adaptive adjustment of the display brightness, which is particularly suitable for display modules of smaller wearable devices.

[0063] Figure 1 is a schematic diagram of the structure of a display module provided in an embodiment of the present application. Figure 1 As shown, the display module includes: a display panel 01, a plurality of light emitting elements L1, at least two sets of ambient light sensors ALS, and a brightness control circuit 02. For example, Figure 1 n groups of ALSs are schematically shown, which are labeled ALS1 to ALSn, respectively, where n is an integer greater than 1. And, taking ALS1 as an example, Figure 1 The circuit diagram of each ALS group is also shown. Figure 1 It can be seen that:

[0064] The display panel 01 has a display area AA and a peripheral area BB at least partially surrounding the display area AA.

[0065] For example, refer to Figure 1 In the display panel 01 shown therein, the peripheral area BB surrounds the display area AA, is located on each side of the display area AA, and the display area AA is rectangular. Of course, the area positions and shapes here are schematic illustrations. It can be understood that the display area AA is the area where the picture can be displayed, and the peripheral area BB can refer to the non-display area where the picture cannot be displayed. Generally, in order to achieve a full screen as much as possible, the display area AA occupies a larger area, while the peripheral area BB occupies a smaller area.

[0066] The plurality of light emitting elements L1 are located in the display area AA. It can be understood that when the plurality of light emitting elements L1 emit light, the display area AA can perform display.

[0067] Optionally, the plurality of light emitting elements L1 may be as follows Figure 1As shown, the array is arranged in the display area AA, that is, the display panel may include multiple rows and columns of light-emitting elements L1. Moreover, the display module may be a liquid crystal display (liquid crystal display), and each light-emitting element L1 may be a light-emitting diode (LED) used in LCD. In LCD, LED is usually used as a backlight source. Correspondingly, the light-emitting brightness of the light-emitting element L1 is also called the backlight brightness. Of course, the arrangement and type of the light-emitting elements here are schematic illustrations.

[0068] At least two groups of ambient light sensors ALS are located in the peripheral area BB. Each group of ambient light sensors ALS includes: a bright state sensor ALS-W and a dark state sensor ALS-D connected in parallel. The bright state sensor ALS-W and the dark state sensor ALS-D each include: a plurality of photosensitive transistors (eg, photosensitive TFTs) T1 connected in parallel.

[0069] That is, in the embodiment of the present application, multiple groups of ambient light sensors ALS can be integrated on the display panel 01 to sense the light brightness, so as to achieve adaptive adjustment of the display brightness. In this way, there is no need for an external ALS, nor is there a need to open a hole on the front of the screen to set the ALS, which can be beneficial to the design of a full screen. In addition, each group of ambient light sensors ALS includes not only a bright state sensor ALS-W that can sense stronger light, but also a dark state sensor ALS-D that can sense weaker light, and the range of light intensity that can be sensed is relatively comprehensive. In addition, each group of ambient light sensors ALS includes each photosensitive transistor T1 connected in parallel. Through this parallel optimization, not only can the problem that a single photosensitive transistor T1 cannot meet the requirements of the size and accuracy of the collected leakage current be solved, but also the size of the ambient light sensor ALS can be reduced as much as possible, which is convenient for the ambient light sensor ALS to be integrated on the display panel.

[0070] For example, Figure 1 Based on this, taking a wearable device with a display module of about 2 inches as an example, Figure 2 The size design of a set of ALS1 integrated on the display module is shown. Figure 2 It can be seen that through parallel optimization, the length of each group of ALS can be shortened to 50% of the conventional length or even smaller. For example, the length L of each group of ALS can be optimized to about 1.75 millimeters (mm), and the width W can be optimized to about 0.03585 mm. In mainstream wearable devices of about 2 inches, the width WW of the ultra-narrow frame is generally about 0.6 mm, and the length LL is generally about tens of mm. It can be seen that each optimized group of ALS can be placed in the display panel. Of course, the dimensions here are only schematic. In addition, Figure 2The figure also schematically shows the length LL from the edge of the ALS1 to the edge of the display panel 01, where LL is approximately 15.5422 mm. The edge of the display area AA and the edge of the TFT are also identified.

[0071] Optionally, in an embodiment of the present application, the dark state sensor ALS-D may further include: a light shielding layer covering the plurality of photosensitive transistors T1 connected in parallel, so as to achieve the purpose of detecting weaker light intensity. The light shielding layer may be, for example, a black matrix layer (BM) with low light transmittance. The bright state sensor ALS-W may not include the light shielding layer (e.g., BM). Correspondingly, as described above, the bright state sensor ALS-W has no additional obstruction to the reception of light and will receive more various kinds of light; while the dark state sensor ALS-D is blocked by a light shielding layer similar to BM, so the reception of certain specific light (e.g., backlight) is limited. On this basis, the dark state sensor ALS-D can be used as a control group for the bright state sensor ALS-W to eliminate the influence of some interference factors such as backlight on the sensing of ambient light, thereby ensuring more reliable sensing of ambient light. For example, when the bright state sensor ALS-W senses abnormal ambient light without BM cover, it can be compared with the ambient light sensed by the dark state sensor ALS-D which is basically unaffected by backlight interference factors to more accurately determine whether the abnormality is caused by factors other than interference factors such as backlight, or is affected by interference factors such as backlight.

[0072] The brightness control circuit 02 is electrically connected to at least two groups of ambient light sensors ALS and the plurality of light-emitting elements L1, respectively. Furthermore, the brightness control circuit 02 is used to: transmit a light sensing control signal to the at least two groups of ambient light sensors ALS, receive a light brightness sensing signal transmitted by the at least two groups of ambient light sensors ALS in response to the light sensing control signal, and control the light brightness of the plurality of light-emitting elements L1 based on the light brightness sensing signal transmitted by the at least one group of ambient light sensors ALS.

[0073] That is, in the embodiment of the present application, when the display brightness needs to be adaptively adjusted, the brightness control circuit 02 can first transmit a photosensitive control signal to each group of ambient light sensors ALS, so that the ambient light sensor ALS can reliably sense the light intensity under the control of the photosensitive control signal, and output an electrical signal (such as leakage current) that can reflect the light intensity as a light brightness sensing signal. On this basis, the brightness control circuit 02 can calculate the light brightness value based on the light brightness sensing signal transmitted by at least one group of ambient light sensors ALS, and flexibly control the light brightness of multiple light-emitting elements L1 based on the calculated light brightness value, thereby achieving the purpose of adaptively adjusting the display brightness, so that the display brightness can change with the change of light intensity.

[0074] Generally, the larger the light brightness sensing signal, the larger the light brightness value, that is, the stronger the light brightness; the smaller the light brightness sensing signal, the smaller the light brightness value, that is, the weaker the light brightness. Moreover, the larger the light brightness value, the brighter the light emitting element L1 can be controlled by the brightness control circuit 02; conversely, the smaller the light brightness value, the darker the light emitting element L1 can be controlled by the brightness control circuit 02.

[0075] In summary, the embodiment of the present application provides a display module. The display module includes multiple light-emitting elements and multiple groups of ambient light sensors located on a display panel, and each group of ambient light sensors includes multiple photosensitive transistors connected in parallel, so as to output a light brightness sensing signal reflecting the brightness under the control of a photosensitive control signal transmitted by a brightness control circuit, so that the brightness control circuit automatically controls the light brightness of multiple light-emitting elements based on the light brightness sensing signal. In this way, adaptive adjustment of display brightness can be achieved.

[0076] Optionally, Figure 3 is a schematic diagram of the structure of another display module provided in an embodiment of the present application. Figure 3 As shown, the brightness control circuit 02 may include: a display driving chip 021 and a light emitting driving circuit 022 .

[0077] Optionally, when the display module is a touch display module, the display driver chip 021 may be, for example, a touch display driver integration integrated circuit (TDDIIC) therein. When the light emitting element L1 is an LED, the light emitting driver circuit 022 may be, for example, an LED driver chip (LEDDriver for short). The following embodiments are described by taking the display driver chip 021 as TDDIIC and the light emitting driver circuit 022 as LED Driver as an example.

[0078] The display driver chip 021 can be connected to at least two groups of ambient light sensors ALS. Furthermore, the display driver chip 021 can be used to transmit a light sensing control signal to the at least two groups of ambient light sensors ALS, receive a light brightness sensing signal transmitted by the at least two groups of ambient light sensors ALS in response to the light sensing control signal, and convert the light brightness sensing signal transmitted by the at least one group of ambient light sensors ALS into a light brightness value.

[0079] Among them, different light brightness values ​​correspond to different light driving signals. That is, each light brightness value can correspond to a light driving signal, and different light brightness values ​​can correspond to different light driving signals. Of course, in some other embodiments, a range of light brightness values ​​can correspond to a light driving signal. The embodiments of the present application are not limited to this.

[0080] Optionally, in Figure 1 Based on this, taking a group of ALS1 as an example, continue to refer to Figure 4 It can be seen that the display driver chip 021 can be connected to the source (source, S) and drain (drain) of multiple photosensitive transistors T1 connected in parallel in each group of ambient light sensors ALS, and can be used to transmit the light sensing control signal to the source of multiple photosensitive transistors T1, and receive the light brightness sensing signal transmitted by the drain of multiple photosensitive transistors T1. In the figure, the drain of the dark state sensor ALS-D in each group of ALS is marked as D, and the drain of the bright state sensor ALS-W is marked as W.

[0081] Optionally, the light-sensing control signal may be, for example, a square wave (i.e., a periodic non-sinusoidal signal). The gate (gate, G) of each photosensitive transistor T1 may receive a control signal of a constant potential (e.g., 0 volts V). On this basis, by transmitting the light-sensing control signal to the source of each photosensitive transistor T1, the gate-source voltage difference of each photosensitive transistor T1 may be controlled, thereby controlling each photosensitive transistor T1 to turn on to sense ambient light and output a light brightness sensing signal. Generally, when the absolute value of the gate-source voltage difference of the transistor is greater than the threshold voltage of the transistor, the transistor may be turned on.

[0082] Of course, the display driver chip 021 may also be connected to the gate of the photosensitive transistor T1 to transmit a required control signal to the gate of the photosensitive transistor T1. Alternatively, the gate of the photosensitive transistor T1 may also be connected to other control ICs to receive control signals provided by other control ICs.

[0083] Furthermore, it is understandable that, as described above, the light brightness sensing signal output by the photosensitive transistor T1 is generally a current signal. On this basis, in the embodiment of the present application, a sampling resistor may be further provided between the drain of the photosensitive transistor T1 and the display driver chip 021 to convert the current signal into a voltage signal through the sampling resistor, and the voltage signal is generally an analog signal. Since the signal processed by the display driver chip 021 is generally a digital signal, in the embodiment of the present application, an analog to digital converter (ADC) may also be provided between the sampling resistor and the display driver chip 021 to convert the voltage value of the analog signal into the voltage value of the digital signal before transmitting it to the display driver chip 021. Of course, the sampling resistor and the ADC may also be integrated into the display driver chip 021 as part of the display driver chip 021.

[0084] Optionally, the voltage signal obtained by the display driver chip 021 can be called raw data (rawdata) converted based on the current signal. Afterwards, the display driver chip 021 can convert the rawdata into a light brightness value or ambient light intensity through an internal ALS algorithm. The ALS algorithm refers to a series of calculation methods and steps for processing ALS output data to achieve specific functions, such as light brightness detection.

[0085] The light driving circuit 022 may be connected to the plurality of light emitting elements L1 and may be used to drive the plurality of light emitting elements L1 to emit light based on a light driving signal corresponding to the light brightness value, so as to control the light brightness of the plurality of light emitting elements L1.

[0086] For example, the light-emitting driving circuit 022 may transmit a light-emitting control signal to the plurality of light-emitting elements L1 under the control of the light-emitting driving signal, so as to light up the plurality of light-emitting elements L1.

[0087] Optionally, the light-emitting driving signal may be, for example, a pulse width modulation (PWM) signal. Furthermore, the amplitude and / or duty cycle of different PWM signals may be different. The amplitude is the voltage value or current value of the PWM signal when it is in a high-level state. The duty cycle is the ratio of the duration of the high level to the duration of the entire cycle in a switching cycle. In this way, different PWM signals may be selected based on different light brightness values ​​to adjust the light brightness of multiple light-emitting elements L1 to be different.

[0088] Next, the method of determining the light-emitting driving signal based on the light brightness value is described as follows:

[0089] (1) As an optional implementation:

[0090] The display driver chip 021 can also be used to connect to the client HOST (or host), and can be used to transmit the determined light brightness value to the client HOST, so that the client HOST can determine the light driving signal corresponding to the light brightness value, and transmit the light driving signal to the connected light driving circuit 022.

[0091] That is, in this optional implementation, the display driver chip 021 can only be responsible for collecting the leakage current transmitted by the ALS, and converting it into rawdata, and then converting the rawdata into a light brightness value through the ALS algorithm and sending it to the HOST. Correspondingly, a microcontroller unit (MCU) MCU or a system on chip (SOC) needs to be set in the HOST to receive the light brightness value output by the display driver chip 021. In addition, the HOST needs to pre-store different light-emitting drive signals corresponding to different light brightness values, and a calculation algorithm (such as interpolation method) for converting the light brightness value into a light-emitting drive signal. After receiving the light brightness value, the HOST can search for the corresponding light-emitting drive signal based on the light brightness value. If the received light brightness value is not pre-stored, the HOST can also calculate the corresponding light-emitting drive signal through an algorithm. Afterwards, the HOST can feed back the determined light-emitting drive signal to the light-emitting drive circuit 022, so that the light-emitting drive circuit 022 can control the light-emitting element L1 to emit light.

[0092] Optionally, the correspondence between different light brightness values ​​and different light driving signals can be stored in the form of a look-up table, and the correspondence can be a value that enables the screen to achieve a better display effect after testing the screen under different known ambient light intensity conditions.

[0093] (2) As another optional implementation:

[0094] Combination Figure 3 The display driver chip 021 can also be connected to the light-emitting driver circuit 022 , and the display driver chip 021 can also be used to: determine the light-emitting driver signal corresponding to the light brightness value, and transmit the light-emitting driver signal to the light-emitting driver circuit 022 .

[0095] That is, in this other implementation, the function of the HOST determining the light driving signal based on the light brightness value in implementation (1) can be integrated into the display driver chip (e.g., TDDIIC) 021. After determining the light brightness value, the display driver chip 021 further determines the light driving signal corresponding to the light brightness value, and directly outputs the required light driving signal to the light driving circuit 022. In this way, the HOST does not need to add an external MCU or SOC to receive the light brightness value and determine the light driving signal. This reduces the complexity of the host setting and saves the host computing power and space.

[0096] Optionally, continue to refer to Figure 5It can be seen that the display driver chip 021 may also be externally mounted with a flash memory Flash, and the display driver chip 021 may establish a communication connection with the flash memory Flash. The communication connection may be, for example, a connection established using a synchronous serial communication bus I2C. Figure 5 Only one photosensitive transistor T1 is schematically shown.

[0097] In the case where the display driver chip 021 is used to determine the light driving signal corresponding to the light brightness value, that is, in the case of the above-mentioned implementation mode (2), different light driving signals corresponding to different brightness values ​​can be stored in the flash memory Flash in the form of a lookup table for the display driver chip 021 to call. Of course, the calculation algorithm of the light driving signal can also be stored in the flash memory Flash for the display driver chip 021 to call. That is, after the display driver chip 021 determines the light brightness value using the ALS algorithm, it can exchange data with the flash memory Flash through the I2C bus, thereby obtaining the required signal or calculation algorithm to reliably determine the light driving signal corresponding to the light brightness value.

[0098] Optionally, the flash memory Flash can be reused to store touch-related firmware (touch fw) to save cost and space.

[0099] It is understandable that implementation (2) is mostly used in wearable devices that require fewer brightness adjustment levels (e.g., 3 to 5 levels). Here, the level refers to dividing the brightness into several different levels, each level corresponding to a different brightness value. For example, level 1 may be the lowest brightness, level 5 is the highest brightness, and level 3 is at a medium to high brightness level.

[0100] Optionally, in an embodiment of the present application, on the basis of setting the display module to include at least two groups of ambient light sensors ALS, the at least two groups of ambient light sensors ALS can be used to alternately and intermittently transmit light brightness sensing signals based on the photosensitivity control signal. That is, each two adjacent groups of ALS can alternately report light brightness sensing signals to the brightness control circuit 02 one after the other, so that the brightness control circuit 02 can adjust the light brightness of the light-emitting element L1. In this way, multiple continuous reading data feedback can be achieved, thereby more accurately feeding back the sensed light brightness to the brightness control circuit 02, so that the brightness control circuit 02 can reliably adjust the display brightness.

[0101] For example, combined with Figure 6The display module shown, taking two groups of ambient light sensors ALS as an example, assumes that in each 100 millisecond (ms) acquisition frame, each group of ALS collects 20 groups of data (i.e., light brightness sensing signals) in 40ms, and the remaining 60ms is reserved for the brightness control circuit 02 to calculate and wait for the arrival of the next frame, and generally there will be several groups of abnormal data discarded in the 20 groups of data, that is, each group of ALS can collect about 15 groups of data in each acquisition frame. In this way, by setting two groups of ambient light sensors ALS to alternately collect and report light brightness sensing signals, 30 groups of data can be collected, achieving twice the continuous reading data feedback.

[0102] It is understandable that in order to distinguish, Figure 6 The two groups of ALS are respectively identified as ALS1 and ALS2, and the gate, source and drain of the photosensitive transistor T1 in ALS1 are respectively identified as G1, S1, D1 / W1; the gate, source and drain of the photosensitive transistor T1 in ALS2 are respectively identified as G2, S2, D2 / W2.

[0103] Optionally, based on the above embodiment, continue to refer to Figure 7 It can be seen that the display module described in the embodiment of the present application may also include: at least two switch transistors T2 (such as switch MOS tubes) corresponding to at least two groups of ambient light sensors ALS. That is, for each group of ALS, a switch transistor T2 can be set accordingly, and for different groups of ALS, different switch transistors T2 can be set accordingly.

[0104] For example, refer to Figure 7 , which schematically shows two groups of ALS1 and ALS2, and accordingly, the display module may further include: two switch transistors T2 connected to the two groups of ALS1 and ALS2 in a one-to-one correspondence. Figure 7 Only one photosensitive transistor T1 included in each group of ALS is schematically shown.

[0105] Each switch transistor T2 can be connected between the brightness control circuit 02 (here, the display driver chip 021 included in the brightness control circuit 02, such as TDDIIC) and a corresponding set of ambient light sensors ALS. Each switch transistor T2 can be used to: receive a switch control signal, and in response to the switch control signal, control the on and off of the brightness control circuit 02 and the corresponding set of ambient light sensors ALS.

[0106] For example, in Figure 7 Combined with the basis Figure 8It can be seen that the gate G01 of each switch transistor T2 can be used to receive a switch control signal, the source S01 of each switch transistor T2 can be connected to the display driver chip 021, and the drain D01 of each switch transistor T2 can be connected to a corresponding set of ALS. And combined with the connection method between the display driver chip 021 and the ALS described above, it can be seen that the drain of each switch transistor T2 here can be connected to the source S of the photosensitive transistor T1 in the ALS (such as the source S1 of the photosensitive transistor T1 in the ALS1). In addition, Figure 8 The Flash external to the display driver chip 021 is also schematically shown.

[0107] Optionally, combined Figure 8 It can also be seen that the gate G01 of each switch transistor T2 can also be connected to the TDDIIC to receive the switch control signal provided by the TDDIIC. Correspondingly, it can be known that the switch control signal can come from the TDDIIC. Of course, in some other embodiments, the gate G01 of the switch transistor T2 can also be connected to other switch control ICs to receive the switch control signal provided by the other switch control ICs. The embodiment of the present application does not limit the source of the switch control signal.

[0108] Among them, the potential of the switch control signal is an effective potential, which can be used to control the brightness control circuit 02 to be connected with a corresponding group of ambient light sensors ALS, so that the photosensitivity control signal provided by the ambient light sensor ALS is transmitted to the ambient light sensor ALS, and the potential of the switch control signal is an invalid potential, which can be used to control the brightness control circuit 02 to be disconnected from the corresponding group of ambient light sensors ALS.

[0109] For example, combined with Figure 8 When the potential of the switch control signal is an effective potential, the switch transistor T2 can be turned on, and then the source and drain of the switch transistor T2 can be turned on, so that the TDDIIC is connected to the source of the photosensitive transistor T1 in the ALS, so that the TDDIIC can output a light-sensing control signal to the source of the photosensitive transistor T1 in the ALS, control the photosensitive transistor T1 to turn on to sense the light brightness and output a light brightness sensing signal. When the potential of the switch control signal is an invalid potential, the switch transistor T2 can be turned off, and then the source and drain of the switch transistor T2 can be disconnected, so that the TDDI IC is disconnected from the source of the photosensitive transistor T1 in the ALS, so that the TDDIIC cannot output a light-sensing control signal to the source of the photosensitive transistor T1 in the ALS, and at this time, the photosensitive transistor T1 cannot be turned on to sense the light brightness, and then it cannot output a light brightness sensing signal.

[0110] Accordingly, in at least two switch transistors T2, there can be an interval between the effective potentials of the switch control signals received by any two switch transistors T2, so that at least two groups of ambient light sensors ALS transmit light brightness sensing signals alternately and intermittently based on the photosensitivity control signal.

[0111] It can be understood that, on the basis of setting the effective potential of the switch control signal received by the two switch transistors T2 to be spaced apart, the turn-on time of the two switch transistors T2 can be spaced apart. Furthermore, the time of the photosensitivity control signal (such as a square wave) transmitted by TDDIIC to the two groups of ALS can be spaced apart. Correspondingly, there is a time interval between the two groups of ALS corresponding to the two switch transistors T2 to sense the light brightness, which can ultimately ensure that the two groups of ambient light sensors ALS can alternately and intermittently transmit light brightness sensing signals based on the photosensitivity control signal. That is, the switch transistor T2 can be added to control the time for TDDIIC to output a square wave.

[0112] Optionally, the display module may further include: a flexible printed circuit (FPC) and an array substrate Array. At least two switch transistors T2 may be located on the array substrate Array or on the flexible printed circuit board FPC. A driving transistor is generally also provided on the array substrate Array to switch under the control of the light-emitting driving circuit 022, thereby driving the light-emitting element L1 to emit light.

[0113] Optionally, at least two switch transistors T2 may be transistors of the same type or of different types. The type here refers to a P-type transistor or an N-type transistor. Moreover, as described above, the effective potential corresponding to the P-type transistor is a low potential, and the effective potential corresponding to the N-type transistor is a high potential.

[0114] Optionally, combined Figure 6 and Figure 7 The display module described in the embodiment of the present application may include: two sets of ambient light sensors ALS, and two switch transistors T2 corresponding to the two sets of ambient light sensors ALS, and the interval between the two sets of ambient light sensors ALS transmitting the light brightness sensing signal may be 50ms. On this basis, taking the switch transistor T2 corresponding to ALS1 as an N-type transistor and the switch transistor T2 corresponding to ALS2 as a P-type transistor as an example, Fig. 9 A control timing diagram is schematically shown.

[0115] Combination Fig. 9It can be seen that first, a switch control signal of an effective potential (i.e., a high potential VGH) can be output to the switch transistor T2 corresponding to ALS1, so that the switch transistor T2 corresponding to ALS1 is turned on, and then the TDDIIC transmits a light-sensitive control signal to the photosensitive transistor T1 in ALS1, controls the photosensitive transistor T1 in ALS1 to turn on and sense the light brightness, and outputs a light brightness sensing signal. Then, after an interval of 50ms, a switch control signal of an effective potential (i.e., a low potential VGL) can be output to the switch transistor T2 corresponding to ALS2, so that the switch transistor T2 corresponding to ALS2 is turned on, and then the TDDIIC transmits a light-sensitive control signal to the photosensitive transistor T1 in ALS2, controls the photosensitive transistor T1 in ALS2 to turn on and sense the light brightness, and outputs a light brightness sensing signal. In this way, the alternating detection of the dual ALS is realized.

[0116] In addition, on the basis of setting the switch transistor T2, when the screen is off, the switch transistor T2 corresponding to each group of ALS can be controlled to be turned off by outputting a switch control signal of an invalid potential to the switch transistor T2 corresponding to each group of ALS, so that the photosensitive transistor T1 in each group of ALS is turned off and stops sensing the light brightness and stops outputting the light brightness sensing signal. Fig. 9 Both waveforms in are pulled to 0V. In this way, computing power can be saved and the power consumption of the whole machine caused by ALS can be reduced.

[0117] Optionally, the brightness control circuit 02 (here may refer to the TDDIIC therein) may also be used for:

[0118] When the difference between the light brightness sensing signals transmitted by the two sets of ambient light sensors ALS is less than the difference threshold, the light brightness of the plurality of light emitting elements L1 is controlled based on the light brightness sensing signals transmitted by the two sets of ambient light sensors ALS.

[0119] When the difference between the light brightness sensing signals transmitted by the two groups of ambient light sensors ALS is greater than or equal to the difference threshold, the luminous brightness of the multiple light-emitting elements L1 is controlled based on the light brightness sensing signal transmitted by one of the groups of ambient light sensors ALS, where one group of ambient light sensors ALS is the group of ambient light sensors ALS that transmits a relatively larger light brightness sensing signal among the two groups of ambient light sensors ALS.

[0120] That is, on the basis of applying two groups of ALS solutions, the display driver chip 021 can also refer to the difference threshold to detect whether the light brightness sensing signals transmitted by the two groups of ALS are greatly different. Assuming that the light brightness sensing signal transmitted by one group of ALS drops sharply due to the ALS being covered or having problems, and there is a large difference with the light brightness sensing signal transmitted by another group of ALS, the display driver chip 021 can determine that a false detection situation has occurred. At this time, the display driver chip 021 can control the luminous brightness of the light-emitting element L1 only based on the relatively large light brightness sensing signal, that is, use the single ALS mode to adjust the brightness. When the light brightness sensing signals transmitted by the two groups of ALS are basically the same, the display driver chip 021 can restart the dual ALS mode to adjust the brightness, that is, control the luminous brightness of multiple light-emitting elements L1 based on the light brightness sensing signals transmitted by the two groups of ambient light sensors ALS, which is also called using the dual ALS mode to adjust the brightness. Optionally, the difference threshold can be pre-stored in the display driver chip 021, and of course it can also be flexibly adjusted.

[0121] Furthermore, it is understandable that the display driver chip 021 can detect the digital voltage signal converted from the leakage current, that is, the rawdata recorded above. For the rawdata that suddenly decreases, the display driver chip 021 can only collect the rawdata and compare it with the relatively large rawdata, without using the ALS algorithm to calculate the light brightness value and any subsequent actions. This can not only prevent false detection, but also reduce the algorithm waste when a single ALS is covered or has problems.

[0122] Optionally, combined Fig.10 In the display module recorded in the embodiment of the present application, the peripheral area BB may surround the display area AA, and the peripheral area BB may include: a first peripheral area BB1 and a second peripheral area BB2 located on opposite sides of the display area AA in the first direction X1. That is, the peripheral area BB includes: two peripheral areas located on the upper and lower sides of the display area AA. Of course, on the basis that the peripheral area BB surrounds the display area AA, it can also be seen that, in addition to the two peripheral areas located on the upper and lower sides of the display area AA, the peripheral area BB actually also includes: two other peripheral areas located on the left and right sides of the display area AA, and these other two peripheral areas can be considered to be located on opposite sides of the display area AA in the second direction X2. Among them, the second peripheral area BB2 can also be called the driver output (DO) side of the display module.

[0123] The first direction X1 and the second direction X2 may intersect. Fig.10 Furthermore, based on the array arrangement of the plurality of light emitting elements L1, the first direction X1 may refer to the row direction, and the second direction X2 may refer to the column direction.

[0124] Based on the above regional division, the following is an example of the location of each part:

[0125] The display driver chip (eg, TDDI IC) 021 may be located in the first peripheral area BB1. Accordingly, the first peripheral area BB1 may also be referred to as an IC side.

[0126] In the case where the display module includes two sets of ambient light sensors ALS1 and ALS2, such as Fig.10 As shown, the two groups of ambient light sensors ALS1 and ALS2 can be both located at the center of the second peripheral area BB2. That is, both groups of ALS can be located on the DO side and set in the center. In this way, it can be ensured that the two groups of ALS1 and ALS2 collect light brightness from the same area, and the collection uniformity is good. And this area can receive ambient light facing the display module, and is mostly used for front-facing handheld wearable products. It can be understood that the center of the second peripheral area BB2 refers to the position where the second peripheral area BB2 is equidistant from the left and right edges, and equidistant from the upper and lower edges.

[0127] Or, if Fig.11 As shown, one group of ambient light sensors ALS1 may be located at the center of the second peripheral area BB2, and another group of ambient light sensors ALS2 may be located in the first peripheral area BB1 and may be located on either side of the display driver chip 021 in the second direction X2. Fig.11 , one group of ALS1 can be located on the DO side and centered, and another group of ambient light sensors ALS2 can be located on the IC side and near the left side of the display driver chip 021. Or, combined Fig.12 , one group of ALS1 can be located on the DO side and centered, and another group of ambient light sensors ALS2 can be located on the IC side and near the right side of the display driver chip 021. In this way, the two groups of ALS1 and ALS2 can collect light brightness from different areas, and the collection range is more comprehensive.

[0128] It is understandable that for a group of ALS2 located near the display driver chip 021, it can be combined with wearable products that are mostly worn on the user's wrist. Since other objects or clothing cuffs are likely to block this place, the ASL2 of the product worn on the left hand can be placed on the right, and the ASL2 of the product worn on the right hand can be placed on the left, thereby reducing the probability of the ALS being blocked, thereby reducing the probability of false detection. In addition, it is also understandable that by setting the ALS close to the display driver chip 021, the wiring impedance can also be reduced, thereby further optimizing the parallel number of photosensitive transistors T1 and achieving a smaller ALS size as much as possible. The wiring here refers to the wiring connecting the display driver chip 021 and the ALS.

[0129] Optionally, combined Fig.10 and the aforementioned Figure 6 It can also be seen that when both groups of ambient light sensors ALS are located at the center of the second peripheral area BB, along the second direction X2, the dark state sensor ALS-D and the bright state sensor ALS-W included in one group of ambient light sensors ALS, and the bright state sensor ALS-W and the dark state sensor ALS-D included in the other group of ambient light sensors ALS can be arranged alternately in sequence. That is, in the two groups of ALS located in the second peripheral area BB2, the two dark state sensors ALS-D can be close to each other, and the two bright state sensors ALS-W can be located on both sides of the two dark state sensors ALS-D, respectively. The two groups of ALS can be arranged adjacent to each other in a DWWD manner.

[0130] It can be understood that because the data collected by the bright state sensor ALS-W is large in magnitude, there is a problem of data differences due to the long distance, while the dark state sensor ALS-D is blocked by a shading layer (such as BM), so the collected data is small in magnitude, and there is no problem of data differences due to the long distance. Therefore, by adopting the DWWD arrangement method, not only can a compact arrangement be achieved, which is conducive to narrow bezel design, but also the data differences caused by differences can be reduced.

[0131] It can also be understood that, in combination with the previous records, when ALS is set on both the DO side and the IC side, the two groups of ALS can serve as control groups for each other, allowing the display driver chip 021 to detect the difference in rawdata collected by the two, and flexibly select single ALS mode to adjust the brightness or dual ALS mode to adjust the brightness according to the difference, which can reduce the probability of false detection and ensure more accurate brightness detection.

[0132] Of course, in the case where the display module includes a set of ambient light sensors ALS, such as Fig.13 As shown, the set of ambient light sensors ALS can be located at the center of the second peripheral area BB2. That is, the set of ALS can be located on the DO side and centered. Or, as Fig.14 As shown, the set of ambient light sensors ALS can be located in the first peripheral area BB1 and on the right side of the display driver chip 021 in the second direction X2. That is, the set of ALS can be located on the IC side and near the right side of the display driver chip 021. Or, as Fig.15 As shown, the set of ambient light sensors ALS may be located in the first peripheral area BB1 and on the left side of the display driver chip 021 in the second direction X2. That is, the set of ALS may be located on the IC side and near the left side of the display driver chip 021.

[0133] Based on the above records, compared with the products of small-sized wearable devices on the market without automatic screen brightness adjustment function, the display module provided by the embodiment of the present application: on the one hand, two or more groups of ALS are integrated on the display panel to achieve accurate brightness sensing, thereby achieving automatic screen brightness adjustment. This not only does not require a hole on the front of the screen, but also facilitates the full-screen design. On the other hand, each group of ALS is set to include multiple photosensitive transistors in parallel, and a small-size design is performed, which is convenient for integration and saves the cost of external ALS. On the other hand, on the basis of setting up two groups of ALS, switching transistors are added so that the two groups of ALS alternately sense the brightness of light and output light brightness sensing signals, which increases the amount of brightness data that can be collected by the display driver chip, thereby achieving the purpose of more accurately adjusting the screen brightness. In this scheme, the two groups of ALS can be arranged in a DWWD manner. On the other hand, on the basis of setting up two groups of ALS, the data output by the two groups of ALS are compared to reduce the probability of false detection, and computing power is saved and power consumption is reduced. In addition, a variety of different ALS placement positions are designed according to the wearing method of wearable devices, reducing the probability of erroneous data feedback caused by ALS being blocked. The above aspects can be combined arbitrarily to flexibly configure solutions according to user needs and wearing requirements, and design modules that meet specification requirements.

[0134] In summary, the embodiment of the present application provides a display module. The display module includes multiple light-emitting elements and multiple groups of ambient light sensors located on a display panel, and each group of ambient light sensors includes multiple photosensitive transistors connected in parallel, so as to output a light brightness sensing signal reflecting the brightness under the control of a photosensitive control signal transmitted by a brightness control circuit, so that the brightness control circuit automatically controls the light brightness of multiple light-emitting elements based on the light brightness sensing signal. In this way, adaptive adjustment of display brightness can be achieved.

[0135] The present application also provides a display device. Fig.16 As shown, the display device includes: a power supply 10, and a display module 00 as described above.

[0136] The power supply 10 is connected to the display module and is used to supply power to the display module.

[0137] Optionally, the display device is a wearable device, and may also include but is not limited to any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and an e-book.

[0138] It is understandable that, since the display device can have substantially the same technical effects as the display module described in the previous embodiment, the technical effects of the display device will not be repeatedly described here for the purpose of brevity.

[0139] It should be noted that the terms used in the examples of this application are only used to explain the examples and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should be the common meanings understood by people with ordinary skills in the field to which this application belongs.

[0140] For example, the words "first", "second" or "third" and similar words used in the patent application specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left" or "right" are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly. "Connect" or "couple" refers to electrical connection. "And / or" means that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0141] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A display module, characterized in that: The display module comprises: A display panel having a display area and a peripheral area at least partially surrounding the display area; A plurality of light emitting elements are located in the display area; At least two groups of ambient light sensors are located in the peripheral area, each group of the ambient light sensors includes: a bright state sensor and a dark state sensor connected in parallel, and the bright state sensor and the dark state sensor each include: a plurality of photosensitive transistors connected in parallel; The brightness control circuit is electrically connected to the at least two groups of ambient light sensors and the multiple light-emitting elements, respectively, and is used to: transmit photosensitivity control signals to the at least two groups of ambient light sensors, receive light brightness sensing signals transmitted by the at least two groups of ambient light sensors in response to the photosensitivity control signals, and control the light brightness of the multiple light-emitting elements based on the light brightness sensing signals transmitted by at least one group of the ambient light sensors.

2. The display module according to claim 1, characterized in that: The at least two groups of ambient light sensors are used to transmit the light brightness sensing signal alternately and intermittently based on the photosensitivity control signal.

3. The display module according to claim 2, characterized in that: The display module further includes: at least two switch transistors corresponding to the at least two groups of ambient light sensors one by one, each of the switch transistors being connected between the brightness control circuit and a corresponding group of the ambient light sensors, and each of the switch transistors being used to: receive a switch control signal, and in response to the switch control signal, control the on / off of the brightness control circuit and the corresponding group of the ambient light sensors; The potential of the switch control signal is an effective potential used to control the brightness control circuit to be connected to a corresponding group of the ambient light sensors, so that the light sensing control signal provided by the ambient light sensor is transmitted to the ambient light sensor, and the potential of the switch control signal is an invalid potential used to control the brightness control circuit to be disconnected from the corresponding group of the ambient light sensors; Furthermore, among the at least two switch transistors, there is an interval between the effective potentials of the switch control signals received by any two of the switch transistors, so that the at least two groups of ambient light sensors transmit the light brightness sensing signals alternately and intermittently based on the photosensitivity control signal.

4. The display module according to claim 3, characterized in that: The display module includes: two groups of ambient light sensors, and two switch transistors corresponding to the two groups of ambient light sensors one by one, and the interval between the two groups of ambient light sensors transmitting the light brightness sensing signals is 50 milliseconds.

5. The display module according to claim 4, characterized in that: The brightness control circuit is used for: When a difference between the light brightness sensing signals transmitted by the two groups of ambient light sensors is less than a difference threshold, controlling the light brightness of the plurality of light emitting elements based on the light brightness sensing signals transmitted by the two groups of ambient light sensors; When the difference between the light brightness sensing signals transmitted by the two groups of ambient light sensors is greater than or equal to the difference threshold, the light brightness of the multiple light-emitting elements is controlled based on the light brightness sensing signal transmitted by one of the groups of ambient light sensors, wherein one group of ambient light sensors is the group of ambient light sensors that transmits a relatively larger light brightness sensing signal among the two groups of ambient light sensors.

6. The display module according to claim 3, characterized in that: The gate of each of the switch transistors is used to receive the switch control signal, the source of each of the switch transistors is connected to the brightness control circuit, and the drain of each of the switch transistors is connected to a corresponding group of the ambient light sensors.

7. The display module according to claim 3, characterized in that: The display module also includes: a flexible printed circuit board and an array substrate; The at least two switch transistors are located on the array substrate or the flexible printed circuit board.

8. The display module according to any one of claims 1 to 7, characterized in that: The brightness control circuit includes: a display driving chip and a light-emitting driving circuit; The display driver chip is connected to the at least two groups of ambient light sensors and is used to transmit the light sensing control signal to the at least two groups of ambient light sensors, receive the light brightness sensing signal transmitted by the at least two groups of ambient light sensors in response to the light sensing control signal, and convert the light brightness sensing signal transmitted by at least one group of the ambient light sensors into a light brightness value; wherein different light brightness values ​​correspond to different light emitting drive signals; The light-emitting driving circuit is connected to the plurality of light-emitting elements and is used to drive the plurality of light-emitting elements to emit light based on a light-emitting driving signal corresponding to the light brightness value, so as to control the light brightness of the plurality of light-emitting elements.

9. The display module according to claim 8, characterized in that: The display driver chip is also used to connect to a client and transmit the determined light brightness value to the client, so that the client can determine a light-emitting driving signal corresponding to the light brightness value and transmit the light-emitting driving signal to the connected light-emitting driving circuit; Alternatively, the display driver chip is also connected to the light-emitting driver circuit, and the display driver chip is further used to: determine a light-emitting driver signal corresponding to the light brightness value, and transmit the light-emitting driver signal to the light-emitting driver circuit.

10. The display module according to claim 9, characterized in that: The display driver chip is also externally mounted with a flash memory, and a communication connection is established between the display driver chip and the flash memory; In the case where the display driver chip is used to determine the light driving signal corresponding to the light brightness value, the different light driving signals corresponding to different brightness values ​​are stored in the flash memory in the form of a lookup table for the display driver chip to call.

11. The display module according to claim 8, characterized in that: The peripheral area surrounds the display area, and the peripheral area includes: a first peripheral area and a second peripheral area located at opposite sides of the display area in a first direction; The display driver chip is located in the first peripheral area; In the case where the display module includes two groups of ambient light sensors, one group of ambient light sensors is located at the center of the second peripheral area, and the other group of ambient light sensors is located in the first peripheral area and on either side of the display driver chip in the second direction, or both groups of ambient light sensors are located at the center of the second peripheral area, and the second direction intersects with the first direction.

12. The display module according to claim 11, characterized in that: When both groups of ambient light sensors are located at the center of the second peripheral area, along the second direction, the dark state sensors and the bright state sensors included in one group of ambient light sensors are arranged in sequence with the bright state sensors and the dark state sensors included in the other group of ambient light sensors.

13. The display module according to claim 8, characterized in that: The display driver chip is connected to the source and drain of multiple photosensitive transistors connected in parallel in each group of the ambient light sensors, and is used to transmit the light sensing control signal to the source of the multiple photosensitive transistors and receive the light brightness sensing signal transmitted by the drain of the multiple photosensitive transistors.

14. A display device, characterized in that: The display device comprises: a power supply, and a display module according to any one of claims 1 to 13; The power supply is connected to the display module and is used to supply power to the display module.

15. The display device according to claim 14, characterized in that: The display device is a wearable device.

Images