Circuit board, driving method thereof and display device

Abstract

A circuit board, a driving method thereof and a display device, the circuit board being used for driving a sensor in a display panel, the sensor comprising a plurality of transistors, the circuit board comprising: a plurality of switching pins electrically connected with first poles of the plurality of transistors; the first output pin of the microcontroller is electrically connected with the second electrodes of the plurality of transistors, and at least one first input pin of the microcontroller is electrically connected with the plurality of switching pins; the microcontroller is configured to provide a pulse width modulation signal for the plurality of transistors through the first output pin, and receive electrical signals at the plurality of switching pins through the at least one first input pin after delaying a preset duration from a rising edge of the pulse width modulation signal.

Description

Circuit board, driving method thereof and display device TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display, and in particular to a circuit board, a driving method thereof and a display device. BACKGROUND

[0002] For decades, the development of the television industry has undergone earth-shattering changes as much as the mobile phone, from heavy black and white televisions to color televisions, and now to large-screen intelligentization. The innovation technology has never stopped changing. With the product update iteration and the higher requirements of the majority of users on display products, it is necessary to continuously break through traditional technology for innovation. In addition to the development in terms of low cost, high transmittance and high contrast, it is also proposed to set sensors on display products, such as adding light sensing and temperature sensing design, to improve the user experience through the setting of sensors.

[0003] SUMMARY

[0004] The present disclosure provides a circuit board, a driving method thereof and a display device, and the specific solutions are as follows:

[0005] In one aspect, the present disclosure provides a circuit board for driving a sensor in a display panel, the sensor comprising a plurality of transistors, the circuit board comprising:

[0006] a plurality of adapter pins, the plurality of adapter pins being electrically connected to first poles of the plurality of transistors;

[0007] a microcontroller, a first output pin of the microcontroller being electrically connected to second poles of the plurality of transistors, and at least one first input pin of the microcontroller being electrically connected to the plurality of adapter pins; the microcontroller is configured to provide a pulse width modulation signal to the plurality of transistors through the first output pin, and receive an electrical signal at the plurality of adapter pins through the at least one first input pin after delaying a preset time length from a rising edge of the pulse width modulation signal.

[0008] In some embodiments, in the above-mentioned circuit board provided by the present disclosure, a second input pin of the microcontroller receives an initial trigger signal.

[0009] The high level and the low level of the pulse width modulation signal are respectively a frame time length, and the rising edge of the pulse width modulation signal is synchronized with the rising edge of the initial trigger signal.

[0010] In some embodiments, in the above-mentioned circuit board provided by the present disclosure, the gate of the transistor is externally connected to a first voltage line.

[0011] The circuit board further comprises a plurality of first resistors, one end of the first resistors being electrically connected with the adapter pins, and the other end of the first resistors being connected with a second voltage line, the voltage of the second voltage line being greater than a ground voltage and less than or equal to the voltage of the first voltage line.

[0012] In some embodiments, in the above-mentioned circuit board provided by the embodiments of the present disclosure, different adapter pins are electrically connected with different first input pins.

[0013] In some embodiments, in the above-mentioned circuit board provided by the embodiments of the present disclosure, the circuit board further comprises a selection switch configured to provide the electrical signals of different adapter pins to the same first input pin in time under the control of a second output pin of the microcontroller.

[0014] In some embodiments, in the above-mentioned circuit board provided by the embodiments of the present disclosure, the circuit board further comprises a plurality of second resistors, one end of different second resistors being electrically connected with different adapter pins, and the other end of different second resistors being electrically connected with different input ends of the selection switch.

[0015] In some embodiments, in the above-mentioned circuit board provided by the embodiments of the present disclosure, the display panel further comprises a temperature sensing trace, and the circuit board further comprises a third resistor, wherein one end of the temperature sensing trace is connected with a power supply voltage, the other end of the temperature sensing trace is electrically connected with one end of the third resistor, and the other end of the third resistor is grounded; a third input pin of the microcontroller is configured to receive the voltage at the connection position of the temperature sensing trace and the third resistor.

[0016] In some embodiments, in the above-mentioned circuit board provided by the embodiments of the present disclosure, the preset time length is 1 / 3-3 / 4 of the display time of one frame.

[0017] On the other hand, the embodiments of the present disclosure provide a driving method of the above-mentioned circuit board, comprising:

[0018] providing a pulse width modulation signal for the plurality of transistors;

[0019] collecting the electrical signals output by the plurality of transistors to the plurality of adapter pins after delaying a preset time length from the rising edge of the pulse width modulation signal.

[0020] In some embodiments, in the above-mentioned driving method provided by the embodiments of the present disclosure, the pulse width modulation signal for the plurality of transistors specifically comprises:

[0021] The initial trigger signal is taken as a reference to generate a pulse width modulation signal, and the pulse width modulation signal is provided to the plurality of transistors, wherein the high level and the low level of the pulse width modulation signal are respectively a frame duration, and the rising edge of the pulse width modulation signal is synchronized with the rising edge of the initial trigger signal.

[0022] In some embodiments, in the driving method provided in the embodiments of the present disclosure, the electrical signals output by the plurality of transistors to the plurality of adapter pins are collected, and specifically comprising:

[0023] The electrical signals output by the plurality of transistors to the plurality of adapter pins are collected multiple times at a sampling period less than the electrical signal fluctuation period of the transistors, and the mean value of the multiple collection results is taken.

[0024] In some embodiments, in the driving method provided in the embodiments of the present disclosure, the electrical signals output by the plurality of transistors to the plurality of adapter pins are collected multiple times at a sampling period less than the electrical signal fluctuation period of the transistors, and specifically comprising:

[0025] The electrical signals output by the plurality of transistors to the plurality of adapter pins are collected 60 to 100 times at a sampling period less than 1 / 2 of the electrical signal fluctuation period of the transistors.

[0026] In some embodiments, in the driving method provided in the embodiments of the present disclosure, after the electrical signals output by the plurality of transistors to the plurality of adapter pins are collected, further comprising:

[0027] The electrical signal of the transistor covered by the color resistance is added with a preset value, and then subtracted from the electrical signal of the transistor covered by the black matrix.

[0028] In some embodiments, in the driving method provided in the embodiments of the present disclosure, before the pulse width modulation signal is provided to the plurality of transistors for the first time, further comprising:

[0029] Detecting a first electrical signal of the transistor covered by the color resistance and a second electrical signal of the transistor covered by the black matrix in a dark environment;

[0030] Taking the difference between the second electrical signal and the first electrical signal as a preset value, and storing the preset value to the microcontroller.

[0031] In some embodiments, in the driving method provided in the embodiments of the present disclosure, the electrical signals output by the plurality of transistors to the plurality of adapter pins are collected after a preset duration is delayed from the rising edge of the pulse width modulation signal, and specifically comprising:

[0032] Collecting the electrical signals output by the plurality of transistors to the plurality of adapter pins after delaying the rising edge of the pulse width modulation signal by 1 / 3 to 3 / 4 of a frame length.

[0033] In another aspect, the display device provided by the embodiments of the present disclosure includes a display panel and a circuit board electrically connected to each other, wherein the circuit board is the above-mentioned circuit board provided by the embodiments of the present disclosure.

[0034] In some embodiments, in the display device provided by the embodiments of the present disclosure, the display panel includes an array substrate, and the array substrate includes a gate drive circuit and an initial trigger signal line located in a non-display area, the gate drive circuit includes a plurality of shift registers arranged in cascade, and a first-stage shift register is electrically connected to the initial trigger signal line.

[0035] In some embodiments, in the display device provided by the embodiments of the present disclosure, the display panel further includes a counter substrate, and the counter substrate includes a black matrix and a color resist, the color resist covers part of the transistors, and the black matrix covers the remaining transistors.

[0036] In some embodiments, in the display device provided by the embodiments of the present disclosure, the display panel includes a first non-display area provided with a binding terminal group and a second non-display area opposite to the first non-display area.

[0037] The plurality of transistors are divided into a plurality of sensors symmetrically arranged about a central axis extending along the arrangement direction of the first non-display area and the second non-display area of the display panel, each sensor on one side of the central axis is electrically connected to the same circuit board, and each sensor on the other side of the central axis is electrically connected to another circuit board.

[0038] In some embodiments, in the display device provided by the embodiments of the present disclosure, further includes a timing control board electrically connected to the circuit board, and a system board electrically connected to the timing control board. BRIEF DESCRIPTION OF DRAWINGS

[0039] FIG. 1 is a structural schematic diagram of a display device provided by the embodiments of the present disclosure;

[0040] FIG. 2 is a structural schematic diagram of a circuit board driving a transistor;

[0041] FIG. 3 is another structural schematic diagram of a circuit board driving a transistor;

[0042] FIG. 4 is a pulse width modulation signal provided by the embodiments of the present disclosure for delay detection;

[0043] FIG. 5 is a driving timing diagram of a circuit board provided by the embodiments of the present disclosure;

[0044] FIG. 6 is a schematic diagram of a reference level lifting according to an embodiment of the present disclosure;

[0045] FIG. 7 is a schematic diagram of another structure of a display device according to an embodiment of the present disclosure;

[0046] FIG. 8 is a schematic diagram of a temperature sensing detection according to an embodiment of the present disclosure;

[0047] FIG. 9 is a flowchart of a driving method of a circuit board according to an embodiment of the present disclosure;

[0048] FIG. 10 is a schematic diagram of setting a preset value according to an embodiment of the present disclosure;

[0049] FIG. 11 is a schematic diagram of adding a preset value to an electrical signal of a color resist covering transistor according to an embodiment of the present disclosure;

[0050] FIG. 12 is a schematic diagram of a light sensing and temperature sensing driving architecture according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described below with reference to the drawings of the embodiments of the present disclosure. It should be noted that, in the drawings, the thicknesses of layers, films, panels, regions, and the like are exaggerated for clarity. In the present disclosure, exemplary embodiments are described with reference to cross-sectional views that are schematic but are intended to be as realistic as possible. As such, the shapes of the figures are intended to show the nature of construction of these regions in practical devices. Consequently, the present disclosure is not to be interpreted as being limited to the specific shapes of the regions as shown in the present disclosure, but rather the shapes are intended to illustrate the regions sufficiently to convey the essence of the present disclosure. For example, regions shown as flat could typically have rough and / or nonlinear features; regions shown as straight could be curved, etc. Consequently, the regions illustrated in the figures are schematic and their shapes and sizes are not intended to illustrate the precise shape of the region, are not reflective of the true scale, and are merely intended to illustrate the embodiments of the present disclosure. Also, like or similar elements are denoted by like or similar reference numerals throughout the drawing. In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits the detailed description of known functions and known components.

[0052] Unless otherwise defined, technical terms or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first", "second", and the like, as used in the description and the claims of this disclosure do not have any specific meaning, and are only used to distinguish different components. The terms "comprising", "including", and the like, mean that the elements or objects before the term encompass the elements or objects listed after the term, and equivalents thereof, and do not exclude other elements or objects. The terms "connected" or "linked" or the like, are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "inner", "outer", "upper", "lower", and the like, are only used to represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships can also be changed accordingly.

[0053] In the following description, when an element or layer is referred to as "on" or "connected to" another element or layer, it can be directly on the other element or layer, directly connected to the other element or layer, or there can be an intermediate element or an intermediate layer. When an element or layer is referred to as "provided on one side of" another element or layer, it can be directly on one side of the other element or layer, directly connected to the other element or layer, or there can be an intermediate element or an intermediate layer. However, when an element or layer is referred to as "directly on" another element or layer, "directly connected to" another element or layer, there is no intermediate element or intermediate layer. The term "and / or" includes any and all combinations of one or more of the associated listed items.

[0054] For LCD products, PAS (Panel as System) is currently an important development direction, and the basic concept is to integrate more functions on the panel to bring more added value to the panel. Among them, the panel integrated sensor (Sensor) is a technology that has gradually developed in recent years, and the light sensing Sensor is one of them. The light sensing Sensor can sense the ambient light brightness and color temperature, and then control the screen and backlight to present different display effects. However, due to the weak driving ability of the light sensing signal itself, it is easy to be coupled by other signals, and the signal acquisition accuracy is very poor, which cannot accurately reflect the current ambient light brightness.

[0055] In order to at least improve the above technical problems, the embodiments of the present disclosure provide a circuit board, a driving method thereof, and a display device. FIG. 1 is a structural schematic diagram of a display device provided by an embodiment of the present disclosure, FIG. 2 is a structural schematic diagram of a driving transistor of a circuit board, FIG. 3 is another structural schematic diagram of a driving transistor of a circuit board, and FIG. 4 is a delay detection pulse width modulation signal provided by an embodiment of the present disclosure.

[0056] As shown in FIGS. 1-3, the circuit board 001 provided by the embodiments of the present disclosure is used to drive the sensors S in the display panel 002. The sensors S can be provided in multiple numbers, for example, six sensors S1-S6 are provided in the present disclosure. One sensor S can include multiple transistors T. In some embodiments, the multiple transistors T of each sensor S can be divided into four transistor groups, wherein each transistor group has at least one transistor T, and three transistor groups can correspond to the red color resist R, the green color resist G, and the blue color resist B respectively, and the other transistor group is covered by the black matrix BM. Thus, the three transistor groups covered by the color resist can be used to detect the ambient light brightness and color temperature, and the transistor group covered by the black matrix can be used as a control group to improve the detection accuracy. For the convenience of distinction, the transistors T covered by the color resist are marked as T L , and the transistors T covered by the black matrix are marked as T D .

[0057] In some embodiments, as shown in FIGS. 1-4, the circuit board 001 provided by the present disclosure can include:

[0058] Multiple adapter pins p, which are electrically connected to the first poles d of the multiple transistors T. In some embodiments, the first poles d of the transistors T (for example, T L or T D ) in the same group are electrically connected to the same adapter pin p, and the first poles d of the transistors T (for example, the T L transistors covered by different color resists, or the T L transistors covered by the color resist, and the T D transistors covered by the black matrix) in different groups are electrically connected to different adapter pins p.

[0059] A microcontroller MCU, a first output pin O1 of the microcontroller MCU is electrically connected to the second poles s of the multiple transistors T, and at least one first input pin I1 of the microcontroller MCU is electrically connected to the multiple adapter pins p. The microcontroller MCU is configured to provide a pulse width modulation signal PWM to the multiple transistors T through the first output pin O1, and to receive an electrical signal at the multiple adapter pins p through the at least one first input pin I1 after delaying a preset time t1 from the rising edge of the pulse width modulation signal PWM.

[0060] In some embodiments, the sensing signal (for example, the light sensing signal) is greatly affected by the GOA (Gate on Array) wiring inside the display panel 002, which affects the detection accuracy. In the above-mentioned circuit board provided by the embodiments of the present disclosure, the microcontroller MCU collects the electrical signal of the transistor T after delaying a preset time t1 from the rising edge of the pulse width modulation signal PWM, so as to avoid the part with severe coupling, thereby effectively improving the detection accuracy.

[0061] In some embodiments, in the circuit board provided in the embodiments of the present disclosure, as shown in FIGS. 2 and 3, the second input pin I2 of the microcontroller MCU receives the initial trigger signal STV1; optionally, the initial trigger signal STV1 is synchronously transmitted by the timing controller (Tcon) to the second input pin I2 of the microcontroller MCU and the initial trigger signal line electrically connected with the first-stage shift register (GOA1).

[0062] In some embodiments, as shown in FIGS. 4 and 5, the microcontroller MCU can generate a pulse width modulation signal PWM based on the initial trigger signal STV1, the high level and the low level of the pulse width modulation signal PWM are respectively a frame duration, and the rising edge of the pulse width modulation signal PWM is synchronous with the rising edge of the initial trigger signal STV1. Based on this, the electrical signal of the transistor T is collected after the rising edge of the pulse width modulation signal PWM is delayed by a preset duration t1, which is equivalent to collecting the electrical signal of the transistor T after the high level of the pulse width modulation signal PWM corresponds to the rising edge of the initial trigger signal STV1 being delayed by a preset duration t1, thereby facilitating avoiding the slow recovery time of the transistor T, collecting the relatively stable region of the latter section (i.e., the time period t2), and improving the detection accuracy. Optionally, the preset duration t1 of the delay can be 1 / 3-3 / 4 of a frame duration (i.e., t1+t2), for example, 1 / 2.

[0063] In some embodiments, in the circuit board provided in the embodiments of the present disclosure, as shown in FIGS. 2 and 3, the gate g of the transistor T is externally connected with a first voltage line V1, and the circuit board 001 further includes a plurality of first resistors R1, one end of the first resistor R1 is electrically connected with the adapter pin p, and the other end of the first resistor R1 is externally connected with a second voltage line V2, the voltage of the second voltage line V2 is greater than the ground voltage GND and less than or equal to the voltage of the first voltage line V1. For example, the voltage of the second voltage line V2 is 1V, 1.2V, 1.8V, etc., and the voltage of the first voltage line V1 is 1V, 1.2V, 1.8V, 3.3V, etc.; wherein 1.2V, 1.8V, 3.3V can be shared with the related signal line of the display device, without the need for additional first voltage line V1 and second voltage line V2, thereby simplifying the circuit structure. It should be understood that, in the case where the voltage of the first voltage line V1 is the same as the voltage of the second voltage line V2, the first voltage line V1 and the second voltage line V2 can be the same voltage line for the purpose of simplifying the circuit structure.

[0064] In some embodiments, as shown in FIG. 6, the other end of the first resistor R1 is commonly grounded with the gate g of the transistor T, which causes the sampling signal at the adapter pin p to have a part lower than 0V after coupling with CLK. When the sampling signal is negative, the microcontroller MCU defaults to zero (the minimum value of the sampling voltage is 0), causing the microcontroller MCU to misidentify, affecting the detection accuracy. By setting the level of the other end of the first resistor R1 to V1 greater than the ground voltage GND and the gate g voltage of the transistor T to V2 greater than or equal to V1 (i.e., greater than the ground voltage GND), the disclosure is equivalent to lifting the sampling reference voltage, which can avoid the negative voltage of the sampling signal and facilitate the acquisition of the true signal, thereby improving the detection accuracy. Moreover, by setting the gate g voltage of the transistor T to be greater than the voltage at the other end of the first resistor R1, the voltage variation range with brightness can be improved.

[0065] In some embodiments, in the above-mentioned circuit board 001 provided by the embodiments of the disclosure, as shown in FIG. 2, different adapter pins p can be electrically connected to different first input pins I1; in some other embodiments, as shown in FIG. 3, the circuit board 001 can further include a selection switch sw, which can be configured to provide the electrical signals of different adapter pins p to the same first input pin I1 in time under the control of a selection signal SEL provided by the second output pin O2 of the microcontroller MCU. Through these two ways, the electrical signals of different transistor groups can be collected respectively.

[0066] In some embodiments, for one sensor S, the selection switch sw can be a four-to-one switch that selects one of the electrical signals of the four transistor groups, so that the electrical signals of the four transistor groups covered by the red color resist R, the green color group G, the blue color resist G, and the black matrix BM can be collected respectively by using one selection switch sw. Of course, the selection switch sw can also be a two-to-one switch that selects one of the two electrical signals, and correspondingly, two selection switches sw can be provided to collect the electrical signals of the four transistor groups covered by the red color resist R, the green color group G, the blue color resist G, and the black matrix BM respectively.

[0067] In some embodiments, in the above-mentioned circuit board provided by the embodiments of the disclosure, as shown in FIG. 3, a plurality of second resistors R2 can be further included, one end of each second resistor R2 is electrically connected to a different adapter pin p, and the other end of each second resistor R2 is electrically connected to a different input end of the selection switch sw, in other words, the disclosure can connect the second resistor R2 in series between the adapter pin p and the selection switch sw. The sampling IO of the microcontroller MCU can withstand a maximum voltage of 3.6V, and the disclosure can prevent the microcontroller MCU from being burned out by a large current by connecting the second resistor R2 in series.

[0068] In some embodiments, as shown in FIG. 7, the display panel 002 can further include a temperature sensing wire TS, and the circuit board 001 can further include a third resistor R3, wherein one end of the temperature sensing wire TS is connected to the power supply voltage VCC, the other end of the temperature sensing wire TS is electrically connected to one end of the third resistor R3, and the other end of the third resistor R3 is grounded GND; the third input pin I3 of the microcontroller MCU is configured to receive the voltage at the connection position of the temperature sensing wire TS and the third resistor R3. FIG. 8 is a schematic diagram of temperature sensing, R in represents the voltage of the temperature sensing wire TS, V out represents the voltage at the connection position of the temperature sensing wire TS and the third resistor R3, and the change of the ambient temperature will cause the change of R in and the resistance value of R3, V out value, and the temperature can be judged by V out value.

[0069] Based on the same inventive concept, the disclosure also provides a driving method of the above-mentioned circuit board, as shown in FIG. 9, which can include the following steps:

[0070] S901, providing a pulse width modulation signal to a plurality of transistors;

[0071] S902, after delaying a preset time length from the rising edge of the pulse width modulation signal, collecting the electrical signals output by the plurality of transistors to a plurality of adapter pins.

[0072] By delaying a preset time length from the rising edge of the pulse width modulation signal PWM, the electrical signals of the transistors can be collected to avoid the serious coupling part and effectively improve the sensing detection accuracy.

[0073] In some embodiments, in the above-mentioned driving method provided by the disclosure, the step S901 of providing a pulse width modulation signal to a plurality of transistors can be implemented by the following way:

[0074] The pulse width modulation signal is generated with reference to the initial trigger signal, and the pulse width modulation signal is provided to the plurality of transistors, wherein the high level and the low level of the pulse width modulation signal are respectively a frame length, and the rising edge of the pulse width modulation signal is synchronized with the rising edge of the initial trigger signal, so that the slow recovery time of the transistor can be avoided, the latter relatively stable area can be collected, and the detection accuracy can be improved.

[0075] In some embodiments, in the above-mentioned driving method provided by the disclosure, the step S902 of collecting the electrical signals output by the plurality of transistors to a plurality of adapter pins after delaying a preset time length from the rising edge of the pulse width modulation signal can specifically include the following steps:

[0076] The electric signals output by the plurality of transistors to the plurality of adapter pins are collected after the rising edge of the pulse width modulation signal is delayed by 1 / 3-3 / 4 (for example, 1 / 2) of the frame length. Taking 60 Hz as an example, the frame length is about 16.6 ms, and the waveform of the transistor has a recovery time of about 7-8 ms. The present disclosure can perform detection after the rising edge of the pulse width modulation signal is delayed by 8 ms, avoiding the slow recovery time of the transistor, and collecting the electric signals in the relatively stable region in the latter stage.

[0077] In some embodiments, in the above driving method provided by the present disclosure, the collection of the electric signals output by the plurality of transistors to the plurality of adapter pins in step S902 can be implemented by the following method:

[0078] The electric signals output by the plurality of transistors to the plurality of adapter pins are collected multiple times at a sampling period less than the fluctuation period of the electric signals of the transistor, and the mean value of the multiple collection results is taken.

[0079] The inventor finds that there is still periodic fluctuation in the stable region in the latter stage. According to the sampling theorem, the sampling is performed at a sampling period less than the fluctuation period, so that the actual sampling uniformly covers the fluctuation period. Then, by taking the mean value, the fluctuation of the electric signals can be effectively smoothed, and the authenticity of the sampling data is improved.

[0080] In some embodiments, in the above driving method provided by the present disclosure, the electric signals output by the plurality of transistors to the plurality of adapter pins are collected multiple times at a sampling period less than the fluctuation period of the electric signals of the transistor. Specifically, the electric signals output by the plurality of transistors to the plurality of adapter pins are collected 60-100 times at a sampling period less than 1 / 2 of the fluctuation period of the electric signals of the transistor. In some embodiments, the fluctuation period is 90 μs, the sampling period is 10-20 μs, and the number of sampling times is 80.

[0081] In some embodiments, in the above driving method provided by the present disclosure, after the collection of the electric signals output by the plurality of transistors to the plurality of adapter pins in step S902, the following step can be further performed:

[0082] The electric signal of the transistor covered by the color resistance is added by a preset value, and then subtracted from the electric signal of the transistor covered by the black matrix.

[0083] As shown in FIG. 10, in the actual sampling process, the electric signal L of the transistor covered by the color resistance can be less than the electric signal D of the transistor covered by the black matrix (i.e., the control group), which causes the microcontroller MCU to calculate an error. To this end, as shown in FIG. 11, the present disclosure adds a preset value ot (Offset) to the electric signal L of the transistor covered by the color resistance, so that the sampling value of the electric signal L of the transistor covered by the color resistance is increased, and then the difference (L+ot-D) can correctly reflect the fluctuation of the ambient light brightness.

[0084] In some embodiments, in the above driving method provided by the embodiments of the present disclosure, before the first time of providing the pulse width modulation signal to the plurality of transistors, the following steps can also be performed:

[0085] detecting a first electrical signal of the transistor covered by the color resist in the dark environment and a second electrical signal of the transistor covered by the black matrix;

[0086] subtracting the first electrical signal from the second electrical signal to obtain a difference value as a preset value, and storing the preset value to the microcontroller.

[0087] In the actual measurement process, when the electrical signal of the transistor covered by the color resist in the ambient light is subtracted from the electrical signal of the transistor covered by the black matrix, the preset value stored in the microcontroller can be called, the preset value is added to the electrical signal of the transistor covered by the color resist, and then the difference between the electrical signal of the transistor covered by the black matrix and the electrical signal of the transistor covered by the color resist is subtracted, so that the real brightness of the ambient light at the moment is reflected by the difference value.

[0088] Based on the same inventive concept, the embodiments of the present disclosure provide a display device, as shown in FIG. 1, FIG. 7 and FIG. 12, comprising a circuit board 001 and a display panel 002 electrically connected to each other, wherein the circuit board 001 is the above-mentioned circuit board 001 provided by the embodiments of the present disclosure, and optionally, the circuit board 001 is electrically connected to the display panel 002 through a chip on film (COF). Since the principle of solving the problem of the display device is similar to the principle of solving the problem of the above-mentioned circuit board 001, the implementation of the display device can be referred to the embodiments of the above-mentioned circuit board 001, and the repeated parts will not be described here.

[0089] In some embodiments, in the above display device provided by the embodiments of the present disclosure, as shown in FIG. 1 and FIG. 7, the display panel 002 comprises an array substrate (array) comprising a gate drive circuit GOA and an initial trigger signal line (not shown in the figure) located in the non-display area BB, the gate drive circuit GOA can comprise a plurality of shift registers arranged in cascade, and the first shift register is electrically connected to the initial trigger signal line. The initial trigger signal STV1 used to generate the pulse width modulation signal PWM in the present disclosure is the signal on the initial trigger signal line of the first shift register.

[0090] In some embodiments, in the above display device provided by the embodiments of the present disclosure, the display panel 002 further comprises a counter substrate (CF) comprising a black matrix and a color resist, the color resist covers part of the transistors, and the black matrix covers the remaining transistors to realize the detection of the brightness and color temperature of the ambient light

[0091] In some embodiments, in the display device provided in the embodiments of the present disclosure, as shown in FIG. 1 and FIG. 7, the display panel 002 includes a first non-display area BB1 provided with a binding terminal group (which can be bound with a chip on film COF), and a second non-display area BB2 opposite to the first non-display area BB1.

[0092] The plurality of transistors are divided into a plurality of sensors S symmetrical about a central axis MN extending along the arrangement direction of the first non-display area BB1 and the second non-display area BB2 of the display panel 002. Each sensor (for example, S1-S3) on one side of the central axis MN is electrically connected to the same circuit board 001, and each sensor (for example, S4-S6) on the other side of the central axis MN is electrically connected to another circuit board 001. Optionally, each sensor S includes four transistor groups, which are covered by red color resist R, green color resist G, blue color resist B, and black matrix BM, respectively, for detecting ambient light brightness and color temperature. In some embodiments, all sensors S can be used to detect ambient light brightness, and some sensors (for example, S3 and S6) can be used to detect the brightness and color temperature of ambient light. Optionally, in the four transistor groups contained in the sensor S used only for detecting ambient light brightness, one transistor group is covered by the black matrix BM as a control group, and the other three transistor groups can be exposed by the black matrix BM and not covered by the color resist, or the other three transistor groups are exposed by the black matrix BM and covered by the color resist, but in specific implementation, only the electrical signals of the four transistor groups are collected to detect the ambient light brightness, and the red, green and blue light signals that can reflect the color temperature of the ambient light are not collected.

[0093] In some embodiments, in the display device provided in the embodiments of the present disclosure, as shown in FIG. 1, FIG. 7 and FIG. 12, a timing control board (Tcon) 003 electrically connected to the circuit board 001 and a system board (SOC) 004 electrically connected to the timing control board 003 can also be included, wherein the timing control board 003 can provide an initial trigger signal STV1 and the like for a microcontroller MCU, and the system board 004 can provide power for the timing control board 003 and the like. In some embodiments, the circuit board 001 and the timing control board 003 are electrically connected through an I2C bus, and the timing control board 003 and the system board 004 can also be electrically connected through an I2C bus.

[0094] In some embodiments, as shown in FIG. 1 and FIG. 7, the display panel 002 can also include a fan-out area FA located in the first non-display area BB1, and a sealant SL surrounding the display area AA and the like. For other essential components in the display panel, those skilled in the art should understand that they are understood, and here is no need to be repeated, and should not be regarded as a limitation on the present disclosure.

[0095] In some embodiments, the display device provided by the embodiments of the present disclosure can further include a backlight module located on the light-incident side of the display panel. The backlight module can be a direct-lit backlight module or a side-lit backlight module. Optionally, the side-lit backlight module can include a lamp strip, a reflector sheet, a light guide plate, a diffusion sheet, a prism group and the like, and the lamp strip is located on one side of the light guide plate in the thickness direction. The direct-lit backlight module can include a matrix light source, a reflector sheet, a diffusion plate and a brightness enhancement film and the like which are stacked on the light-incident side of the matrix light source, and the reflector sheet includes apertures corresponding to the positions of the lamp beads in the matrix light source. The lamp beads in the lamp strip and the lamp beads in the matrix light source can be light-emitting devices (LEDs), such as quantum dot light-emitting devices.

[0096] In some embodiments, the lamp beads can also be micro light-emitting devices (such as Mini LED, Micro LED) and the like. The micro light-emitting devices in the order of sub-millimeter or even micrometer and organic light-emitting devices (OLED) are self-luminous devices. Like organic light-emitting devices, they have a series of advantages such as high brightness, ultra-low delay, ultra-large viewing angle and the like. Moreover, since the inorganic light-emitting device emits light based on metal semiconductors with more stable properties and lower resistance, it has the advantages of lower power consumption, longer service life and better resistance to high and low temperatures compared with organic light-emitting devices based on organic substances. When the micro light-emitting device is used as a backlight source, it can achieve more precise dynamic backlight effect, effectively improve the screen brightness and contrast, and solve the glare phenomenon caused by the traditional dynamic backlight between the bright and dark areas of the screen, thereby optimizing the visual experience.

[0097] In some embodiments, the display device provided by the embodiments of the present disclosure can be any product or component with display function, such as a display, a projector, a 3D printer, a virtual reality device, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigation device, a smart watch, a fitness wristband, a personal digital assistant, and the like. Optionally, the display device provided by the embodiments of the present disclosure includes, but is not limited to, a radio frequency unit, a network module, an audio output & input unit, a sensor, a display unit, a user input unit, an interface unit, a control chip, and the like. Optionally, the control chip is a central processing unit, a digital signal processor, a system chip (SoC), and the like. For example, the control chip can further include a memory, and can further include a power module, and the like, and the power supply and signal input and output functions are realized through wires, signal lines, and the like arranged additionally. For example, the control chip can further include hardware circuitry and computer executable code, and the like. The hardware circuitry can include conventional very large scale integration (VLSI) circuitry or gate array, and existing semiconductors or other discrete elements such as logic chips, transistors, and the like; the hardware circuitry can also include field programmable gate array, programmable array logic, programmable logic device, and the like. In addition, the above structure does not constitute a limitation on the display device provided by the embodiments of the present disclosure, in other words, the display device provided by the embodiments of the present disclosure can include more or less components, or combine certain components, or arrange different components.

[0098] Although the preferred embodiments of the present disclosure have been described, those skilled in the art who understand the basic inventive concept can make additional changes and modifications to the embodiments. Therefore, the appended claims are intended to be interpreted as including all changes and modifications falling within the scope of the present disclosure.

[0099] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the embodiments of the present disclosure. Thus, if these modifications and variations of the embodiments of the present disclosure fall within the scope of the claims of the present disclosure and their equivalent technologies, the present disclosure also intends to include these modifications and variations.

Claims

1. A circuit board for driving a sensor in a display panel, the sensor comprising a plurality of transistors, wherein, The circuit board includes: Multiple adapter pins, wherein the multiple adapter pins are electrically connected to the first electrode of the multiple transistors; A microcontroller, wherein a first output pin of the microcontroller is electrically connected to the second electrode of the plurality of transistors, and at least one first input pin of the microcontroller is electrically connected to the plurality of adapter pins; the microcontroller is configured to provide a pulse width modulation signal to the plurality of transistors through the first output pin, and receive electrical signals at the plurality of adapter pins through the at least one first input pin after a preset delay from the rising edge of the pulse width modulation signal.

2. The circuit board as claimed in claim 1, wherein, The second input pin of the microcontroller receives the initial trigger signal; The high and low levels of the pulse width modulation signal are each one frame in length, and the rising edge of the pulse width modulation signal is synchronized with the rising edge of the initial trigger signal.

3. The circuit board as described in claim 1 or 2, wherein, The gate of the transistor is connected to a first voltage line; The circuit board also includes a plurality of first resistors, one end of which is electrically connected to the adapter pin, and the other end of which is externally connected to a second voltage line. The voltage of the second voltage line is greater than the ground voltage and less than or equal to the voltage of the first voltage line.

4. The circuit board as described in any one of claims 1 to 3, wherein, Different adapter pins are electrically connected to different first input pins.

5. The circuit board as described in any one of claims 1 to 3, wherein, It also includes a selection switch configured to, under the control of the second output pin of the microcontroller, provide electrical signals from different adapter pins to the same first input pin in a time-division manner.

6. The circuit board as claimed in claim 5, wherein, It also includes multiple second resistors, one end of which is electrically connected to different adapter pins, and the other end of which is electrically connected to different input terminals of the selector switch.

7. The circuit board according to any one of claims 1 to 6, wherein, The display panel also includes a temperature sensing trace, and the circuit board also includes a third resistor. One end of the temperature sensing trace is connected to an external power supply voltage, and the other end of the temperature sensing trace is electrically connected to one end of the third resistor, and the other end of the third resistor is grounded. The third input pin of the microcontroller is configured to receive the voltage at the connection point between the temperature sensing trace and the third resistor.

8. The circuit board according to any one of claims 1 to 7, wherein, The preset duration is 1 / 3 to 3 / 4 of the time it takes to display one frame.

9. A driving method for a circuit board as described in any one of claims 1 to 8, wherein, include: Provide pulse width modulation signals for the plurality of transistors; After a preset time delay from the rising edge of the pulse width modulation signal, the electrical signals output by the plurality of transistors to the plurality of adapter pins are acquired.

10. The driving method as described in claim 9, wherein, Providing pulse width modulation signals to the plurality of transistors specifically includes: A pulse width modulation (PWM) signal is generated with reference to the initial trigger signal and provided to the plurality of transistors. The high level and low level of the PWM signal are each one frame duration, and the rising edge of the PWM signal is synchronized with the rising edge of the initial trigger signal.

11. The driving method as described in claim 9 or 10, wherein, Acquiring the electrical signals output from the plurality of transistors to the plurality of adapter pins specifically includes: The electrical signals output from the multiple transistors to the multiple adapter pins are sampled multiple times according to a sampling period shorter than the electrical signal fluctuation period of the transistor, and the average value of the multiple sampling results is taken.

12. The driving method as described in claim 11, wherein, The electrical signals output from the plurality of transistors to the plurality of adapter pins are sampled multiple times according to a sampling period shorter than the electrical signal fluctuation period of the transistor, specifically including: The electrical signals output from the plurality of transistors to the plurality of adapter pins are sampled 60 to 100 times with a sampling period less than half the electrical signal fluctuation period of the transistor.

13. The driving method according to any one of claims 9 to 12, wherein, After acquiring the electrical signals output from the plurality of transistors to the plurality of adapter pins, the method further includes: After adding a preset value to the electrical signal of the transistor covered by the color resist, the difference is processed with the electrical signal of the transistor covered by the black matrix.

14. The driving method according to any one of claims 9 to 13, wherein, Before initially providing a pulse width modulation signal to the plurality of transistors, the method further includes: Detect the first electrical signal of the transistor covered by the color resistor and the second electrical signal of the transistor covered by the black matrix in a dark environment; The difference between the second electrical signal and the first electrical signal is used as a preset value, and the preset value is stored in the microcontroller.

15. The driving method according to any one of claims 9 to 14, wherein, After a preset time delay from the rising edge of the pulse width modulation signal, the electrical signals output by the plurality of transistors to the plurality of adapter pins are acquired, specifically including: The electrical signals output by the plurality of transistors to the plurality of adapter pins are acquired 1 / 3 to 3 / 4 of the time after a delay of one frame from the rising edge of the pulse width modulation signal.

16. A display device, wherein, It includes a display panel and a circuit board that are electrically connected to each other, wherein the circuit board is the circuit board as described in any one of claims 1 to 8.

17. The display device as claimed in claim 16, wherein, The display panel includes an array substrate, which includes a gate driving circuit and an initial trigger signal line located in the non-display area. The gate driving circuit includes a plurality of cascaded shift registers, with the first-stage shift register electrically connected to the initial trigger signal line.

18. The display device as claimed in claim 16 or 17, wherein, The display panel further includes a counter substrate, which includes a black matrix and a color resist, the color resist covering a portion of the transistors and the black matrix covering the remaining transistors.

19. The display device according to any one of claims 16 to 18, wherein, The display panel includes a first non-display area with a binding terminal group and a second non-display area opposite to the first non-display area; The plurality of transistors are divided into a plurality of sensors symmetrical about a central axis extending along the arrangement direction of the first non-display area and the second non-display area of ​​the display panel, with the central axis on one side... Each of the sensors is electrically connected to the same circuit board, and each of the sensors on the other side of the central axis is electrically connected to another circuit board.

20. The display device according to any one of claims 16 to 19, wherein, It also includes a timing control board electrically connected to the circuit board, and a system board electrically connected to the timing control board.

Images