Brightness adjusting method and circuit and display panel

Abstract

The invention relates to a brightness adjusting method and circuit and a display panel. The light sensing device in the light sensing circuit can sense the light intensity, the sensed light intensity and the sliding resistance value of the variable resistance circuit are used for generating the light sensing voltage matched with the environment light intensity, and the change of the light sensing voltage can reflect the change of the environment light intensity under the condition that the sliding resistance value is not adjusted. The control circuit outputs a brightness adjusting signal corresponding to the photosensitive voltage based on the photosensitive voltage, and the brightness adjusting signal is a PWM pulse wave signal and is used for changing the display brightness of the display panel, so that the display brightness is automatically adjusted in combination with the ambient light intensity, and the problem that the brightness cannot be automatically adjusted according to the ambient light in the existing PWM dimming is solved.

Description

Technical Field

[0001] The present application relates to the field of brightness adjustment, and in particular to a brightness adjustment method, circuit and display panel. Background Art

[0002] With the continuous innovation of technology, the dimming technology of displays is also constantly improving, with the aim of bringing better visual experience to users. The current mainstream dimming technology is PWM dimming. PWM (pulse width modulation) dimming technology is a dimming method widely used in displays. Its basic principle is not that the LED light is always on, but that it switches on and off quickly. When the time the LED light is on (PWM positive duty cycle) increases, its brightness will increase; conversely, when the on time decreases, the brightness will decrease. Due to the visual persistence effect of the human eye, the LED lights we see seem to be continuously glowing. However, the current solutions basically use MCU or other programmable chips to generate and control PWM, but this control method can only adjust the brightness by manually changing the PWM duty cycle, and cannot automatically adjust the brightness according to the ambient light. Summary of the invention

[0003] The present application provides a brightness adjustment method, circuit and display panel to solve the problem that the existing PWM dimming cannot automatically adjust the brightness according to the ambient light.

[0004] In a first aspect, the present application provides a brightness adjustment circuit, which includes an electrically connected photosensitive circuit and a control circuit, wherein the photosensitive circuit includes a photosensitive device and a variable resistance circuit connected in series, and the photosensitive circuit outputs a corresponding photosensitive voltage to the control circuit based on the light intensity sensed by the photosensitive device and the sliding resistance value of the variable resistance circuit, and the control circuit generates and outputs a corresponding brightness adjustment signal based on the photosensitive voltage received from the photosensitive circuit.

[0005] Optionally, the variable resistance circuit includes a first resistor, a first diode, a second diode, a variable resistor, a first capacitor and a second capacitor;

[0006] The first end of the first resistor is connected to a power supply, and the second end of the first resistor is respectively connected to the anode of the first diode, the cathode of the second diode, and the discharge pin of the control circuit; the cathode of the first diode is connected back to the anode of the second diode through the photosensitive device and the variable resistor in sequence; the adjustment end of the variable resistor is respectively connected to the first end of the first capacitor, the trigger pin of the control circuit, and the threshold control pin of the control circuit; the second end of the first capacitor is commonly grounded with the second end of the second capacitor and the ground pin of the control circuit; the first end of the second capacitor is connected to the voltage control pin of the control circuit.

[0007] Optionally, the photosensitive voltage includes a first detection voltage provided for a threshold control pin of the control circuit, and a second detection voltage provided for a trigger pin of the control circuit.

[0008] Optionally, the photosensitive device is at least one of a photoresistor, a photodiode, and a phototransistor.

[0009] Optionally, the control circuit includes a third capacitor, a second resistor, a third resistor, a fourth resistor, a first voltage comparator, a second voltage comparator, a trigger, an inverter, and a triode;

[0010] The first end of the third capacitor is respectively connected to the power supply and the first end of the second resistor, and the second end of the third capacitor is grounded; the second end of the second resistor is respectively connected to the first end of the third resistor and the reverse input end of the first voltage comparator, the reverse input end of the first voltage comparator also serves as the voltage control pin of the control circuit, and the positive input end of the first voltage comparator serves as the trigger pin of the control circuit; the second end of the third resistor is respectively connected to the positive input end of the second voltage comparator and the first end of the fourth resistor, and the reverse input end of the second voltage comparator serves as the threshold control pin of the control circuit; the second end of the fourth resistor and the emitter of the transistor are grounded in common;

[0011] The first input end of the trigger is connected to the output end of the first voltage comparator, the second input end of the trigger is connected to the output end of the second voltage comparator, the reverse reset pin of the trigger serves as the reset pin of the control circuit, and the reverse output end of the trigger is respectively connected to the reverse input end of the inverter and the base of the transistor; the output end of the inverter serves as the output end of the control circuit, and the collector of the transistor serves as the discharge pin of the control circuit.

[0012] Optionally, the duty cycle of the brightness adjustment signal is the ratio of the charging time to the discharging time of the first capacitor, the charging time of the first capacitor is positively correlated with the first resistor, the photoresistor and the sliding resistance of the variable resistor, and the discharging time of the first capacitor is positively correlated with the sliding resistance of the variable resistor.

[0013] In a second aspect, a brightness adjustment method is provided, the brightness adjustment method comprising:

[0014] Obtaining a photosensitive voltage output by a photosensitive circuit in a brightness adjustment circuit based on the light intensity sensed by a photosensitive device and a sliding resistance value of a variable resistance circuit;

[0015] According to the comparison result between the light-sensitive voltage and the preset voltage range, a corresponding brightness adjustment signal is output.

[0016] Optionally, outputting a corresponding brightness adjustment signal according to a comparison result between the light-sensitive voltage and a preset voltage range includes at least one of the following:

[0017] When the photosensitive voltage is within the preset voltage range, outputting the brightness adjustment signal output last time as the current brightness adjustment signal;

[0018] When the first detection voltage is less than the voltage lower limit of the preset voltage range, outputting a high-level brightness adjustment signal, wherein the photosensitive voltage includes the first detection voltage;

[0019] When the second detection voltage is greater than the voltage upper limit value of the preset voltage range, a low-level brightness adjustment signal is output, wherein the photosensitive voltage includes the second detection voltage.

[0020] Optionally, after outputting a corresponding brightness adjustment signal according to a comparison result between the photosensitive voltage and a preset voltage range, the method further includes:

[0021] When a brightness adjustment operation instruction is detected, the brightness adjustment operation instruction is forwarded to the brightness adjustment circuit to adjust the sliding resistance value of the variable resistance circuit;

[0022] Re-acquire the photosensitive voltage output by the photosensitive circuit in the brightness adjustment circuit based on the light intensity sensed by the photosensitive device and the sliding resistance value of the variable resistance circuit;

[0023] Based on the comparison result between the light-sensitive voltage and the preset voltage range, a corresponding brightness adjustment signal is output.

[0024] In a third aspect, the present application provides a display panel, which includes a display panel body and a driving circuit. The display panel body and the driving circuit are electrically connected, and the driving circuit includes a brightness adjustment circuit as described in any one of the above.

[0025] The above-mentioned technical solution provided by the embodiment of the present application has the following advantages compared with the prior art: the brightness adjustment circuit provided by the embodiment of the present application, the brightness adjustment circuit includes an electrically connected photosensitive circuit and a control circuit, the photosensitive circuit includes a photosensitive device and a variable resistance circuit connected in series, the photosensitive circuit outputs a corresponding photosensitive voltage to the control circuit based on the light intensity sensed by the photosensitive device and the sliding resistance value of the variable resistance circuit, and the control circuit generates and outputs a corresponding brightness adjustment signal based on the photosensitive voltage received from the photosensitive circuit.

[0026] Based on the fact that the photosensitive device in the photosensitive circuit can sense the intensity of light, the sensed light intensity and the sliding resistance of the variable resistance circuit are used to generate a photosensitive voltage that matches the ambient light intensity. When the sliding resistance is not adjusted, the change in the photosensitive voltage can reflect the change in the ambient light intensity. The control circuit outputs a brightness adjustment signal corresponding to the photosensitive voltage. The brightness adjustment signal is a PWM pulse wave signal, which is used to change the display brightness of the display panel, thereby realizing automatic adjustment of the display brightness in combination with the ambient light intensity, solving the problem that the existing PWM dimming cannot automatically adjust the brightness according to the ambient light. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0030] Figure 1 A schematic diagram of the structure of a brightness adjustment circuit provided in an embodiment of the present application;

[0031] Figure 2 A schematic diagram of the structure of a display panel provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the structure of a brightness adjustment circuit provided in an embodiment of the present application;

[0033] Figure 4 A schematic diagram of the structure of a control circuit provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of a process of brightness adjustment method provided in an embodiment of the present application;

[0035] Figure 6 A schematic diagram of the internal structure of a computer device provided in an embodiment of the present application;

[0036] Figure 7 A schematic diagram of the structure of a display panel provided in an embodiment of the present application;

[0037] 100, brightness adjustment circuit; 110, photosensitive circuit; 111, photosensitive device; 112, variable resistance circuit; 120, control circuit; R1, first resistor; D1, first diode; D2, second diode; RL, variable resistor; C1, first capacitor; C2, second capacitor; C3, third capacitor; R2, second resistor; R3, third resistor; R4, fourth resistor; A1, first voltage comparator; A2, second voltage comparator; U2, trigger; A3, inverter; Q1, transistor 200, drive circuit; 300, display panel body; 711, processor; 712, communication interface; 713, memory; 714, communication bus. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0040] In one embodiment, the brightness adjustment method is applied to a display panel, and the display panel includes a brightness adjustment circuit 100, which is used to sense the ambient light of the display panel and automatically adjust the display brightness of the display panel according to the intensity of the ambient light.

[0041] like Figure 1 As shown, the brightness adjustment circuit 100 includes an electrically connected photosensitive circuit 110 and a control circuit 120, wherein the photosensitive circuit 110 includes a photosensitive device 111 and a variable resistance circuit 112 connected in series, and the photosensitive circuit 110 outputs a corresponding photosensitive voltage to the control circuit 120 based on the light intensity sensed by the photosensitive device 111 and the sliding resistance value of the variable resistance circuit 112, and the control circuit 120 generates and outputs a corresponding brightness adjustment signal based on the photosensitive voltage received from the photosensitive circuit 110, wherein the sliding resistance value of the variable resistance circuit 112 is adjustable.

[0042] Specifically, the photosensitive circuit 110 is used to sense the light intensity of the environment in which the display panel is located, and convert the sensed light intensity into a corresponding photosensitive voltage, that is, different photosensitive voltages are used to indicate different light intensities, and the photosensitive voltage is in direct proportion to the light intensity, that is, the higher the light intensity, the larger the corresponding photosensitive voltage, and vice versa, the lower the light intensity, the smaller the corresponding photosensitive voltage. The control circuit 120 outputs a corresponding brightness adjustment signal according to the received photosensitive voltage, and the brightness adjustment signal is a PWM control signal. The duration of the brightness adjustment signal in different level states is used to indicate the PWM duty cycle. The PWM duty cycle is the ratio between the duration of the high-level brightness adjustment signal and the duration of the low-level brightness adjustment signal. The PWM duty cycle is used to determine the display brightness of the display panel. The larger the PWM duty cycle, the higher the display brightness of the corresponding display panel, and the smaller the PWM duty cycle, the lower the display brightness of the corresponding display panel.

[0043] The photosensitive device 111 may be at least one of a photoresistor, a photodiode, and a phototransistor to sense the light intensity, and the photosensitive device 111 is disposed on the outer surface of the display panel. Figure 2 As shown, the photosensitive device 111 is implemented by a photoresistor and is arranged at the lower left corner of the display panel. The variable resistance circuit 112 is connected in series with the photosensitive device 111 to dynamically adjust the photosensitive resistance of the photosensitive circuit 110, that is, the photosensitive resistance is the sum of the resistance of the photosensitive device 111 and the sliding resistance of the variable resistance circuit 112. The sliding resistance of the variable resistance circuit 112 is the resistance of the resistor involved in the work in the photosensitive circuit 110. The sum of the detection voltage of the photosensitive device 111 and the detection voltage of the variable resistance circuit 112 is used to determine the photosensitive voltage, and the variable resistance circuit 112 can dynamically adjust the resistance involved in the work according to the demand, that is, to achieve the effect of artificially changing the photosensitive voltage dynamically, so as to achieve the effect of artificially changing the actual brightness.

[0044] However, the resistance of the variable resistance circuit 112 may generally be a fixed custom value. In this case, only the resistance of the photosensitive device 111 changes with the ambient light intensity, thereby achieving an effect of automatically adjusting the display brightness according to the ambient light intensity.

[0045] Based on the fact that the photosensitive device 111 in the photosensitive circuit 110 can sense the light intensity, the sensed light intensity and the sliding resistance of the variable resistance circuit 112 are used to generate a photosensitive voltage that matches the ambient light intensity. When the sliding resistance is not adjusted, the change in the photosensitive voltage can reflect the change in the ambient light intensity. The control circuit 120 outputs a brightness adjustment signal corresponding to the photosensitive voltage. The brightness adjustment signal is a PWM pulse wave signal, which is used to change the display brightness of the display panel, thereby realizing automatic adjustment of the display brightness in combination with the ambient light intensity, thereby solving the problem that the existing PWM dimming cannot automatically adjust the brightness according to the ambient light.

[0046] In one embodiment, Figure 3 As shown, the variable resistance circuit 112 includes a first resistor R1, a first diode D1, a second diode D2, a variable resistor RL, a first capacitor C1 and a second capacitor C2;

[0047] The first end of the first resistor R1 is connected to the power supply, and the second end of the first resistor R1 is respectively connected to the anode of the first diode D1, the cathode of the second diode D2, and the discharge pin of the control circuit 120; the cathode of the first diode D1 is connected back to the anode of the second diode D2 through the photosensitive device 111 and the variable resistor RL in sequence; the adjustment end of the variable resistor RL is respectively connected to the first end of the first capacitor C1, the trigger pin of the control circuit 120, and the threshold control pin of the control circuit 120; the second end of the first capacitor C1 is grounded together with the second end of the second capacitor C2 and the ground pin of the control circuit 120; the first end of the second capacitor C2 is connected to the voltage control pin of the control circuit 120.

[0048] Specifically, refer to Figure 3 In this embodiment, the photosensitive device 111 is implemented as a photoresistor, and the variable resistor RL is a sliding variable resistor RL. Figure 3 U1 in the figure is used to indicate the control circuit 120. The resistance value of the first resistor R1 is fixed and unchanged. When the ambient light intensity changes, the resistance value of the photoresistor will be affected. The sliding resistance value of the variable resistor RL can be adjusted by sliding based on the user operation. When the sliding resistance value of the variable resistor RL is not adjusted, only the resistance value of the photoresistor changes. The change in resistance value will affect the charging and discharging time of the first capacitor C1. The charging path of the first capacitor C1 is the power supply VCC, the first resistor R1, the first diode D1, the photoresistor, the variable resistor RL to the first capacitor C1. The change in the resistance value of the photoresistor and the change in the resistance value of the variable resistor RL will affect the charging time of the first capacitor C1. The discharge path of the first capacitor C1 The first capacitor C1, the variable resistor RL, the second diode D2 to the control circuit 120, wherein the resistance change of the variable resistor RL affects the discharge time of the first capacitor C1, and the resistance change affects the charge and discharge time of the first capacitor C1. The voltage passing through the first capacitor C1 is different under different charge and discharge times, that is, the resistance change affects the voltage passing through the first capacitor C1, that is to say, the photosensitive voltage is the detection voltage for the first capacitor C1, so that the photosensitive voltage can be changed based on the resistance change of the photoresistor, and the photosensitive voltage is used to generate a brightness adjustment signal to change the display brightness, so as to realize adaptive brightness adjustment based on the change of ambient light intensity.

[0049] In one embodiment, the photosensitive voltage includes a first detection voltage provided to a threshold control pin of the control circuit 120 , and a second detection voltage provided to a trigger pin of the control circuit 120 .

[0050] Specifically, the first detection voltage is the detection voltage provided by the first end of the first capacitor C1 to the threshold control pin of the control circuit 120, and the second detection voltage is the detection voltage provided by the first end of the first capacitor C1 to the trigger pin of the control circuit 120. The threshold control pin and the trigger pin of the control circuit 120 correspond to different voltage thresholds, and when the detection voltage of the first capacitor C1 reaches the voltage threshold corresponding to the respective pins, the respective corresponding actions are triggered to be executed. Here, it is equivalent to the control circuit 120 providing trigger logic corresponding to two different voltage thresholds for the detection voltage of the first capacitor C1, which can trigger the output of corresponding brightness adjustment signals according to different detection voltages.

[0051] In one embodiment, Figure 4 As shown, the control circuit 120 includes a third capacitor C3, a second resistor R2, a third resistor R3, a fourth resistor R4, a first voltage comparator A1, a second voltage comparator A2, a trigger U2, an inverter A3, and a transistor Q1;

[0052] The first end of the third capacitor C3 is respectively connected to the power supply and the first end of the second resistor R2, and the second end of the third capacitor C3 is grounded; the second end of the second resistor R2 is respectively connected to the first end of the third resistor R3 and the reverse input end of the first voltage comparator A1, the reverse input end of the first voltage comparator A1 also serves as the voltage control pin of the control circuit 120, and the positive input end of the first voltage comparator A1 serves as the trigger pin of the control circuit 120; the second end of the third resistor R3 is respectively connected to the positive input end of the second voltage comparator A2 and the first end of the fourth resistor R4, and the reverse input end of the second voltage comparator A2 serves as the threshold control pin of the control circuit 120; the second end of the fourth resistor R4 is grounded together with the emitter of the transistor Q1;

[0053] The first input end of the trigger U2 is connected to the output end of the first voltage comparator A1, the second input end of the trigger U2 is connected to the output end of the second voltage comparator A2, the reverse reset pin of the trigger U2 serves as the reset pin of the control circuit 120, and the reverse output end of the trigger U2 is respectively connected to the reverse input end of the inverter A3 and the base of the transistor Q1; the output end of the inverter A3 serves as the output end of the control circuit 120, and the collector of the transistor Q1 serves as the discharge pin of the control circuit 120.

[0054] Specifically, the resistance values ​​of the second resistor R2, the third resistor R3, and the fourth resistor R4 are all 5k. The three resistors are connected in series between the power supply VCC and the ground for voltage division of the power supply. The potential corresponding to the second end of the second resistor R2 is 2 / 3VCC, and the potential corresponding to the second end of the third resistor R3 is 1 / 3VCC. They are connected to the reverse input end of the first voltage comparator A1 at the 2 / 3VCC potential, and the positive input end of the first voltage comparator A1 is used to receive the second detection voltage. The first voltage comparator A1 is used to compare the second detection voltage with the 2 / 3VCC threshold voltage. When the second detection voltage is less than the 2 / 3VCC threshold voltage, the first voltage comparator A1 outputs a low level signal 0, that is, the R pin of the trigger U2 receives the low level signal 0. Conversely, when the second detection voltage is greater than the 2 / 3VCC threshold voltage, the high level signal 1 is output, that is, the R pin of the trigger U2 receives the high level signal 1.

[0055] The 1 / 3VCC potential is connected to the positive input terminal of the second voltage comparator A2, and the reverse input terminal of the second voltage comparator A2 is used to receive the first detection voltage. The second voltage comparator A2 is used to compare the first detection voltage with the 1 / 3VCC threshold voltage. When the first detection voltage is greater than the 1 / 3VCC threshold voltage, the second voltage comparator A2 outputs a low level signal 0, that is, the S pin of the trigger U2 receives the low level signal 0. Conversely, when the first detection voltage is less than the 1 / 3VCC threshold voltage, the second voltage comparator A2 outputs a high level signal 1, that is, the S pin of the trigger U2 receives the high level signal 1.

[0056] The trigger U2 is used to output the corresponding level signal to the inverter A3 according to the level signal received by the R pin and the S pin, and the inverter A3 outputs the final brightness adjustment signal (PWM signal). When the level signals corresponding to the R pin and the S pin of the trigger U2 are both low-level signals 0, the Q output pin of the trigger U2 continues to output with reference to the previous output level signal to maintain the previous output state, and the inverter A3 also maintains the previous output level signal, that is, the output brightness adjustment signal is consistent with the brightness adjustment signal output last time. When the level signal received by the R pin of the trigger U2 is a high-level signal 1 and the level signal received by the S pin is a low-level signal 0, the output pin Q of the trigger U2 outputs a high-level signal 1, which is then reversely processed by the inverter A3 to output a low-level brightness adjustment signal. Similarly, when the R pin of the trigger U2 receives a low-level signal 0 and the S pin receives a high-level signal 1, the output pin Q outputs a low-level signal 0, which is then reversely processed by the inverter A3 to output a high-level brightness adjustment signal.

[0057] That is, when the first detection voltage and the second detection voltage are between the 1 / 3VCC threshold voltage and the 2 / 3VCC threshold voltage, the signals received by the R pin and the S pin of the trigger U2 are both low-level signals 0, thereby outputting a brightness adjustment signal that is the same as the previous state. When the first detection voltage is lower than the 1 / 3VCC threshold voltage, it means that the ambient light intensity is strong. In order to adapt to the environment with strong light, the display brightness needs to be increased, so a high-level brightness adjustment signal is output to increase the display brightness. When the second detection voltage is higher than the 2 / 3VCC threshold voltage, it means that the ambient light intensity is weak. In order to adapt to the environment with weak light, the display brightness needs to be reduced, so a low-level brightness adjustment signal is output to reduce the display brightness. In this way, it is possible to output a brightness adjustment signal for adjusting the corresponding display brightness according to different ambient light intensities.

[0058] In one embodiment, the duty cycle of the brightness adjustment signal is the ratio of the charging time to the discharging time of the first capacitor C1, the charging time of the first capacitor C1 is positively correlated with the first resistor R1, the photoresistor and the sliding resistance of the variable resistor RL, and the discharging time of the first capacitor C1 is positively correlated with the sliding resistance of the variable resistor RL.

[0059] Specifically, the duty cycle of the brightness adjustment signal is the ratio of the charging time to the discharging time of the first capacitor C1. The charging path of the first capacitor C1 is the power supply VCC, the first resistor R1, the first diode D1, the photoresistor, the variable resistor RL to the first capacitor C1, wherein the resistance values ​​of the first resistor R1 and the first diode D1 are fixed, and only the resistance change of the photoresistor and the resistance change of the variable resistor RL will affect the charging time of the first capacitor C1. The discharging path of the first capacitor C1 is the first capacitor C1, the variable resistor RL, the second diode D2 to the control circuit 120, wherein the resistance value of the second diode D2 is fixed, and only the resistance change of the variable resistor RL will affect the discharging time of the first capacitor C1. That is, the resistance change of the photoresistor and the variable resistor RL in the charging path of the first capacitor C1 will affect the charging time, and the resistance change of the variable resistor RL in the discharging path of the first capacitor C1 will affect the discharging time, so the duty cycle of the brightness adjustment signal can be adjusted by changing the resistance change on the charging and discharging path.

[0060] For the adjustment of the discharge time, the resistance of the variable resistor RL can be fixed or changed manually. For the adjustment of the charging time, the resistance of the photoresistor can be changed based on the change of the ambient light, or the resistance of the variable resistor RL can be changed manually while the resistance of the photoresistor is changed, so as to realize the automatic adjustment of the display brightness in accordance with the ambient light and the brightness adjustment intention of the viewer.

[0061] When the resistance of the fixed variable resistor RL is selected to remain unchanged, only the resistance of the photoresistor changes according to the change of the ambient light intensity, thereby changing the charging time of the first capacitor C1. The discharge time at this time remains unchanged, and the duty cycle of the brightness adjustment signal is determined based on the ratio between the changing charging time and the fixed discharge time.

[0062] When adjusting the resistance of the variable resistor RL, the resistance of the photoresistor changes according to the change of the ambient light intensity, and the charging time of the first capacitor C1 is changed in combination with the change of the resistance of the variable resistor RL, and the discharge time is changed by the change of the resistance of the variable resistor RL, so as to determine the duty cycle of the brightness adjustment signal based on the ratio between the changed charging time and the changed discharge time. Different duty cycles of the brightness adjustment signal are used to correspond to different display brightness, so that the brightness of the display panel can be adjusted according to the ambient light intensity and the viewing needs of the display panel viewer.

[0063] In one embodiment, Figure 5 As shown, a brightness adjustment method is provided, and the brightness adjustment method includes:

[0064] In step S210 , a photosensitive voltage outputted by the photosensitive circuit 110 in the brightness adjustment circuit 100 based on the light intensity sensed by the photosensitive device 111 and the sliding resistance value of the variable resistance circuit 112 is obtained.

[0065] Specifically, the control circuit 120 in the brightness adjustment circuit 100 obtains the photosensitive voltage output by the photosensitive circuit 110. The photosensitive circuit 110 can sense the intensity of ambient light and output corresponding photosensitive voltages for different light intensities.

[0066] Step S220: outputting a corresponding brightness adjustment signal according to a comparison result between the light-sensing voltage and a preset voltage range.

[0067] Specifically, the control circuit 120 outputs a corresponding brightness adjustment signal according to the comparison result between the received photosensitive voltage and the preset voltage range. Different brightness adjustment signals correspond to different level states, and the level states include low level and high level. The high-level brightness adjustment signal is used to control the display panel to emit light, and the low-level brightness adjustment signal is used to control the display panel to stop displaying. The duration of the high-level brightness adjustment signal is used to indicate the display brightness. When the display duration (PWM positive duty cycle) increases, the display brightness will increase; conversely, when the display duration decreases, the brightness will decrease.

[0068] Since the photosensitive circuit 110 can automatically output a corresponding photosensitive voltage according to the ambient light intensity, the high and low levels of the brightness adjustment signal and the duration of different levels can be dynamically adjusted according to the size of the photosensitive voltage, thereby automatically adjusting the brightness of the display panel according to the ambient light intensity.

[0069] In one embodiment, outputting a corresponding brightness adjustment signal according to a comparison result between the light-sensitive voltage and a preset voltage range includes at least one of the following:

[0070] When the photosensitive voltage is within the preset voltage range, outputting the brightness adjustment signal output last time as the current brightness adjustment signal;

[0071] When the first detection voltage is less than the voltage lower limit of the preset voltage range, outputting a high-level brightness adjustment signal, wherein the photosensitive voltage includes the first detection voltage;

[0072] When the second detection voltage is greater than the voltage upper limit value of the preset voltage range, a low-level brightness adjustment signal is output, wherein the photosensitive voltage includes the second detection voltage.

[0073] Specifically, the photosensitive voltage includes a first detection voltage and a second detection voltage. The first detection voltage is the voltage received by the threshold control pin of the control circuit 120, and the second detection voltage is the voltage received by the trigger pin of the control circuit 120. If the first detection voltage and the second detection voltage are both within the preset voltage range, the brightness adjustment signal output last time is output as the current brightness adjustment signal, that is, the last output state is maintained, that is, the display brightness is not adjusted, and the display brightness is maintained unchanged.

[0074] That is, when the first detection voltage and the second detection voltage are between the 1 / 3VCC threshold voltage and the 2 / 3VCC threshold voltage, the signals received by the R pin and the S pin of the trigger U2 are both low-level signals 0, thereby outputting a brightness adjustment signal that is the same as the previous state. When the first detection voltage is lower than the 1 / 3VCC threshold voltage, it means that the ambient light intensity is strong. In order to adapt to the environment with strong light, the display brightness needs to be increased, so a high-level brightness adjustment signal is output to increase the display brightness. When the second detection voltage is higher than the 2 / 3VCC threshold voltage, it means that the ambient light intensity is weak. In order to adapt to the environment with weak light, the display brightness needs to be reduced, so a low-level brightness adjustment signal is output to reduce the display brightness. In this way, it is possible to output a brightness adjustment signal for adjusting the corresponding display brightness according to different ambient light intensities.

[0075] When the first detection voltage is less than the voltage lower limit value of the preset voltage range, a high level brightness adjustment signal is output.

[0076] The voltage upper limit value of the preset voltage range is the threshold voltage of the second voltage comparator A2 in the control circuit 120, which is 2 / 3VCC, and the first detection voltage is the voltage received by the threshold control pin of the control circuit 120. When the voltage received by the threshold control pin of the control circuit 120 is higher than 2 / 3VCC, the control circuit 120 outputs a low-level brightness adjustment signal to stop emitting light, and prohibits emitting light according to the duration corresponding to the low-level brightness adjustment signal, thereby automatically reducing the display brightness of the display panel according to the ambient light intensity.

[0077] When the second detection voltage is greater than the voltage upper limit value of the preset voltage range, the voltage lower limit value of the preset voltage range of the output low-level brightness adjustment signal is the threshold voltage of the first voltage comparator A1 in the control circuit 120, which is 1 / 3VCC, and the second detection voltage is the voltage received by the trigger pin of the control circuit 120. When the voltage received by the trigger pin of the control circuit 120 is lower than 1 / 3VCC, the control circuit 120 outputs a high-level brightness adjustment signal to start emitting light, and continues to emit light according to the duration corresponding to the low-level brightness adjustment signal, thereby automatically increasing the display brightness of the display panel according to the ambient light intensity.

[0078] In one embodiment, after outputting a corresponding brightness adjustment signal according to a comparison result between the photosensitive voltage and the preset voltage range, the method further includes:

[0079] When a brightness adjustment operation instruction is detected, the brightness adjustment operation instruction is forwarded to the brightness adjustment circuit 100 to adjust the sliding resistance value of the variable resistance circuit 112;

[0080] Re-acquire the photosensitive voltage output by the photosensitive circuit 110 in the brightness adjustment circuit 100 based on the light intensity sensed by the photosensitive device 111 and the sliding resistance value of the variable resistance circuit 112;

[0081] Based on the comparison result between the light-sensitive voltage and the preset voltage range, a corresponding brightness adjustment signal is output.

[0082] Specifically, the brightness adjustment operation instruction is used to change the sliding resistance of the variable resistor RL in the variable resistance circuit 112, that is, the adjustment instruction initiated by the viewer of the display panel for the display brightness, which is used to realize artificial adjustment of the display brightness. After adjusting the sliding resistance of the variable resistance circuit 112, the brightness adjustment circuit 100 will change the resistance of the photosensitive device 111 based on the light intensity sensed by the photosensitive device 111, and the change of the sliding resistance of the variable resistance circuit 112 will change the charging time of the first capacitor C1 in the brightness adjustment circuit 100, and the change of the sliding resistance of the variable resistance circuit 112 will also change the discharge time of the first capacitor C1. Based on the changed charging time and discharge time, a corresponding photosensitive voltage will be output, and the control circuit 120 will compare the changed photosensitive voltage with the preset voltage range to output a brightness adjustment signal with a duty cycle corresponding to the charging time and the discharge time. The different duty cycles of the brightness adjustment signal are used to correspond to different display brightnesses, so that the brightness adjustment of the display panel can be realized according to the ambient light intensity and the viewing needs of the display panel viewer.

[0083] Figure 5 FIG. 1 is a flow chart of a brightness adjustment method in an embodiment. It should be understood that although Figure 5 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 5 At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0084] like Figure 6 As shown, an embodiment of the present application provides a computer device, including a processor 711, a communication interface 712, a memory 713, a communication bus 714 and the above-mentioned display panel, wherein the processor 711, the communication interface 712, and the memory 713 communicate with each other through the communication bus 714;

[0085] Memory 713, used for storing computer programs;

[0086] The processor 711 is used to implement the brightness adjustment method provided by any one of the above method embodiments when executing the program stored in the memory 713.

[0087] Those skilled in the art will understand that Figure 6The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0088] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0089] like Figure 7 As shown, an embodiment of the present application provides a display panel, which includes a display panel body 300 and a driving circuit 200. The display panel body 300 and the driving circuit 200 are electrically connected, and the driving circuit 200 includes the brightness adjustment circuit 100 described in any one of the above embodiments.

[0090] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the relevant technology can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0091] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative can be used.

[0092] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A brightness adjustment circuit, characterized in that: The brightness adjustment circuit includes an electrically connected photosensitive circuit and a control circuit, wherein the photosensitive circuit includes a photosensitive device and a variable resistance circuit connected in series, and the photosensitive circuit outputs a corresponding photosensitive voltage to the control circuit based on the light intensity sensed by the photosensitive device and the sliding resistance value of the variable resistance circuit, and the control circuit generates and outputs a corresponding brightness adjustment signal based on the photosensitive voltage received from the photosensitive circuit.

2. The brightness adjustment circuit according to claim 1, characterized in that: The variable resistance circuit includes a first resistor, a first diode, a second diode, a variable resistor, a first capacitor and a second capacitor; The first end of the first resistor is connected to a power supply, and the second end of the first resistor is respectively connected to the anode of the first diode, the cathode of the second diode, and the discharge pin of the control circuit; the cathode of the first diode is connected back to the anode of the second diode through the photosensitive device and the variable resistor in sequence; the adjustment end of the variable resistor is respectively connected to the first end of the first capacitor, the trigger pin of the control circuit, and the threshold control pin of the control circuit; the second end of the first capacitor is commonly grounded with the second end of the second capacitor and the ground pin of the control circuit; the first end of the second capacitor is connected to the voltage control pin of the control circuit.

3. The brightness adjustment circuit according to claim 2, characterized in that: The photosensitive voltage includes a first detection voltage provided for a threshold control pin of the control circuit, and a second detection voltage provided for a trigger pin of the control circuit.

4. The brightness adjustment circuit according to claim 2, characterized in that: The photosensitive device is at least one of a photoresistor, a photodiode, and a phototransistor.

5. The brightness adjustment circuit according to claim 3, characterized in that: The control circuit includes a third capacitor, a second resistor, a third resistor, a fourth resistor, a first voltage comparator, a second voltage comparator, a trigger, an inverter, and a triode; The first end of the third capacitor is respectively connected to the power supply and the first end of the second resistor, and the second end of the third capacitor is grounded; the second end of the second resistor is respectively connected to the first end of the third resistor and the reverse input end of the first voltage comparator, the reverse input end of the first voltage comparator also serves as the voltage control pin of the control circuit, and the positive input end of the first voltage comparator serves as the trigger pin of the control circuit; the second end of the third resistor is respectively connected to the positive input end of the second voltage comparator and the first end of the fourth resistor, and the reverse input end of the second voltage comparator serves as the threshold control pin of the control circuit; the second end of the fourth resistor and the emitter of the transistor are grounded in common; The first input end of the trigger is connected to the output end of the first voltage comparator, the second input end of the trigger is connected to the output end of the second voltage comparator, the reverse reset pin of the trigger serves as the reset pin of the control circuit, and the reverse output end of the trigger is respectively connected to the reverse input end of the inverter and the base of the transistor; the output end of the inverter serves as the output end of the control circuit, and the collector of the transistor serves as the discharge pin of the control circuit.

6. The brightness adjustment circuit according to claim 4, characterized in that: The duty cycle of the brightness adjustment signal is the ratio of the charging time to the discharging time of the first capacitor. The charging time of the first capacitor is positively correlated with the first resistor, the photoresistor and the sliding resistance of the variable resistor. The discharging time of the first capacitor is positively correlated with the sliding resistance of the variable resistor.

7. A brightness adjustment method, characterized in that: The brightness adjustment method comprises: Obtaining a photosensitive voltage output by a photosensitive circuit in a brightness adjustment circuit based on the light intensity sensed by a photosensitive device and a sliding resistance value of a variable resistance circuit; According to the comparison result between the light-sensitive voltage and the preset voltage range, a corresponding brightness adjustment signal is output.

8. The method according to claim 7, characterized in that Outputting a corresponding brightness adjustment signal according to a comparison result between the light-sensitive voltage and the preset voltage range includes at least one of the following: When the photosensitive voltage is within the preset voltage range, outputting the brightness adjustment signal output last time as the current brightness adjustment signal; When the first detection voltage is less than the voltage lower limit of the preset voltage range, outputting a high-level brightness adjustment signal, wherein the photosensitive voltage includes the first detection voltage; When the second detection voltage is greater than the voltage upper limit value of the preset voltage range, a low-level brightness adjustment signal is output, wherein the photosensitive voltage includes the second detection voltage.

9. The method according to claim 7, characterized in that: After outputting a corresponding brightness adjustment signal according to a comparison result between the photosensitive voltage and the preset voltage range, the method further includes: When a brightness adjustment operation instruction is detected, the brightness adjustment operation instruction is forwarded to the brightness adjustment circuit to adjust the sliding resistance value of the variable resistance circuit; Re-acquire the photosensitive voltage output by the photosensitive circuit in the brightness adjustment circuit based on the light intensity sensed by the photosensitive device and the sliding resistance value of the variable resistance circuit; Based on the comparison result between the light-sensitive voltage and the preset voltage range, a corresponding brightness adjustment signal is output.

10. A display panel, characterized in that: The display panel comprises a display panel body and a driving circuit. The display panel body and the driving circuit are electrically connected. The driving circuit comprises the brightness adjustment circuit as claimed in any one of claims 1 to 7.

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