Debugging circuit and method for controllable low-power-consumption display of mobile phone screen

Abstract

The invention discloses a debugging circuit and method for controllable low-power-consumption display of a mobile phone screen in the technical field of mobile phone screens, and the debugging circuit comprises an input signal adjustment module, a temperature compensation module and a signal correction module which comprises an analog multiplier U, an impedance matching module and a feedback circuit. The output end of the analog multiplier U is electrically connected with the input end of the impedance matching module, the output end of the impedance matching module is electrically connected with the feedback circuit, the output end of the feedback circuit is electrically connected with the input end of the RC low-pass filter, and the output end of the RC low-pass filter is electrically connected with the input end of the signal conversion module. An output electric signal is adjusted through the second operational transconductance amplifier, the output drift characteristic of the digital-to-analog converter is counteracted through multiplication of the analog multiplier, so that color deviation and display distortion are eliminated, frequency modulation is achieved by multiplying the input electric signal with a feedback signal, high-frequency noise is restrained, and the display quality is improved. And the risk of screen display distortion is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile phone screens, and in particular to a debugging circuit and method for controllable low-power display of a mobile phone screen. Background Art

[0002] Most current smartphone screens are LCD and OLED. LCD screens require a backlight to illuminate the screen, and regardless of the displayed content, the backlight must continuously operate, resulting in relatively high overall power consumption. LCD screens tend to consume slightly more power than OLED screens. OLED screens typically consume power between 0.1W and 1.5W. Since each pixel on an OLED screen can independently emit light, OLED screens consume less power when displaying dark colors like black, as the pixels do not emit light. However, OLED screens consume relatively more power when displaying bright colors like white.

[0003] The existing debugging circuit for screen power consumption display is prone to color deviation due to the drift of the output voltage of the digital-to-analog converter (DAC) as the temperature changes, which further leads to screen display distortion. Summary of the Invention

[0004] The purpose of the present invention is to provide a debugging circuit and method for a controllable low-power display on a mobile phone screen. The output electrical signal is adjusted by a second operational transconductance amplifier, and multiplied by an analog multiplier to offset the output drift characteristics of the digital-to-analog converter, thereby eliminating color deviation and display distortion. Frequency modulation is achieved by multiplying the input electrical signal with the feedback signal, suppressing high-frequency noise and reducing the risk of screen display distortion.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In the first aspect, the present invention provides a debugging circuit and method for a controllable low-power display on a mobile phone screen, comprising an input signal adjustment module, a temperature compensation module and a signal correction module, wherein the signal correction module comprises an analog multiplier U, an impedance matching module and a feedback circuit, wherein the output end of the analog multiplier U is electrically connected to the input end of the impedance matching module, the output end of the impedance matching module is electrically connected to the feedback circuit, the output end of the feedback circuit is electrically connected to the input end of an RC low-pass filter, the output end of the RC low-pass filter is electrically connected to the input end of a signal conversion module, the output end of the signal conversion module is electrically connected to the input end of a buffer amplifier, the signal correction module is used to adjust the frequency of the output signal to reduce the distortion component of the output signal, the temperature compensation module collects the temperature of the environment in which the display screen is located in real time through an integrated temperature sensor, and converts the temperature into the actual value. The signal is converted into an electrical signal, and the output electrical signal is adjusted by the second operational transconductance amplifier OTA2. The analog multiplier U performs multiplication operation to offset the output drift characteristics of the digital-to-analog converter (DAC), thereby eliminating color deviation and display distortion. In the signal correction module, the analog multiplier U realizes frequency modulation by multiplying the input electrical signal with the feedback signal to suppress high-frequency noise. The impedance matching module is set to ensure the impedance consistency of the signal transmission link to reduce signal reflection loss. The feedback circuit samples the signal from the second end of the second capacitor C2, and generates an error signal after comparing it with the original signal. The error signal is filtered out of high-frequency interference by the RC low-pass filter, and then output to the signal conversion module for digital-to-analog conversion. The output of the signal conversion module is directly driven by the screen pixel unit after the driving capability is enhanced by the buffer amplifier, which can effectively reduce the power consumption of the display screen.

[0007] The output end of the input signal adjustment module is electrically connected to the first input end of the analog multiplier U. The input signal adjustment module is used to adjust the input signal V in To compensate for the DC component, the input signal adjustment module adjusts the input signal V in An adjustable DC voltage is injected to compensate for level drift during signal transmission. At the same time, the input signal adjustment module performs preliminary amplification on the original signal by setting a first operational transconductance amplifier OTA1 to improve the signal-to-noise ratio of the signal. By connecting a second resistor R2 and a first capacitor C1 to the output end of the first operational transconductance amplifier OTA1, high-frequency interference components can be filtered out to ensure that the amplitude and phase of the signal output by the input signal adjustment module 1 are consistent.

[0008] The output end of the temperature compensation module is electrically connected to the second input end of the analog multiplier U. The temperature compensation module is used to convert the collected ambient temperature into an electrical signal and calculate the compensation signal value, and output the compensation signal value to the analog multiplier U to offset the signal deviation caused by temperature drift.

[0009] As a further solution of the present invention, the input signal adjustment module includes a first operational transconductance amplifier OTA1, the non-inverting input terminal of the first operational transconductance amplifier OTA1 is electrically connected to the second terminal of the first resistor R1, the first terminal of the first resistor R1 is electrically connected to the second terminal of the current source I, and the first terminal of the current source I is connected to the input signal V in , the current source I is used to generate the bias current I bias The inverting input terminal of the first operational transconductance amplifier OTA1 is grounded, the output terminal of the first operational transconductance amplifier OTA1 is electrically connected to the first terminal of the second resistor R2, the second terminal of the second resistor R2 is electrically connected to the first input terminal of the analog multiplier U, and the two ends of the second resistor R2 are connected in parallel with a first capacitor C1, wherein the bias current I generated by the current source I bias For input signal V in An adjustable DC voltage is injected to compensate for level drift during signal transmission; the first capacitor C1 and the second resistor R2 are connected in parallel to form an RC low-pass filter network, which can effectively filter out high-frequency interference components, ensure the consistency of the amplitude and phase of the output signal, and improve the signal-to-noise ratio of the signal.

[0010] As a further solution of the present invention: the first resistor R1 and the second resistor R2 form a voltage divider circuit, and the voltage divider circuit is used to divide the input signal V in Perform preliminary attenuation to obtain the attenuation voltage V div : The resistance ratio of the first resistor to the second resistor is

[0011] The first resistor R1 and the second resistor R2 are provided to form a voltage divider circuit, which is used to divide the input signal V in Perform preliminary attenuation to obtain the attenuation voltage V div Among them, by setting the resistance ratio of the first resistor R1 and the second resistor R2 to 10:1, it can ensure that the input signal amplitude is attenuated to 1 / 11 of the original value to adapt to the input voltage range of the analog multiplier U and prevent signal overload or distortion; at the same time, the attenuation voltage V div The second end of the first resistor R1 is input to the non-inverting input end of the first operational transconductance amplifier OTA1, and combined with the transconductance gain of the first operational transconductance amplifier OTA1, precise adjustment and level matching of the input signal are achieved, which can improve the power consumption efficiency and signal integrity of the debugging circuit.

[0012] As a further solution of the present invention: the voltage V of the feedback signal of the input signal adjustment module temp for:

[0013] , where A is V adj is the amplification gain of the first operational transconductance amplifier OTA1, V adjAdjust voltage for bias;

[0014] The bias adjustment voltage is: , where V adj Adjust voltage for bias; The bias current is

[0015] The amplification gain of the first operational transconductance amplifier OTA1 can control the signal amplitude and improve the control accuracy of the signal amplitude; adj As a bias adjustment voltage, level matching is achieved by combining input attenuation and bias current, and by setting the bias current I bias The current consumption is 10μA~1mA, which can minimize the current consumption in low power mode and provide sufficient driving capability when the signal integrity requirement is high. bias , to match the changes in the brightness of the mobile phone screen and improve the energy efficiency and response accuracy of the overall debugging circuit.

[0016] The temperature compensation module includes a temperature sensor and a second operational transconductance amplifier OTA2. The output end of the temperature sensor is electrically connected to the non-inverting input end of the second operational transconductance amplifier OTA2. The inverting input end of the second operational transconductance amplifier OTA2 is connected to the bias voltage V ref The output terminal of the second operational transconductance amplifier OTA2 is electrically connected to the load resistor R L The first end of the load resistor R L The second end of the second operational transconductance amplifier OTA2 is electrically connected to the second input end of the analog multiplier U, and the second operational transconductance amplifier OTA2 is used to input the compensation voltage V to the second input end of the analog multiplier U. comp .

[0017] The compensation voltage V comp for:

[0018] , where g m is the transconductance of the second operational transconductance amplifier OTA2, (V t -V ref ) is the input voltage difference, which can represent the difference between the temperature sensor output voltage and the reference voltage, and directly reflect the temperature change through the difference. The compensation voltage V comp By inputting the electrical signal adjusted according to the temperature into the second input terminal of the analog multiplier U, real-time compensation for the temperature drift of the circuit can be achieved, ensuring that the bias current I bias The stability is not affected by temperature, which helps to reduce the current consumption of the display screen while ensuring the driving capability when high signal integrity requirements are required.

[0019] As a further solution of the present invention: the analog multiplier U is used to output a nonlinear conversion voltage, and the nonlinear conversion voltage is:

[0020] , where K is the analog multiplier scaling factor and λ is the gamma parameter.

[0021] As a further solution of the present invention: the impedance matching module is a third resistor R3, the first end of the third resistor R3 is electrically connected to the output end of the analog multiplier U, and the second end of the third resistor R3 is electrically connected to the input end of the feedback circuit. The third resistor R3 is used to match the impedance between the analog multiplier U and the feedback circuit to suppress common-mode noise.

[0022] As a further solution of the present invention: the feedback circuit includes a third operational transconductance amplifier OTA3, a non-inverting input terminal of the third operational transconductance amplifier OTA3 is electrically connected to the second end of the third resistor R3 and the first end of the fourth resistor R4, an inverting input terminal of the third operational transconductance amplifier OTA3 is grounded, an output terminal of the third operational transconductance amplifier OTA3 is electrically connected to the first end of the second capacitor C2 and the first end of the switch S1, the first end of the second capacitor C2 is electrically connected to the first end of the fifth resistor R5, the first end of the fifth resistor R5 is grounded, the second end of the switch S1 is electrically connected to the second end of the fifth resistor R5, the second end of the fourth resistor R4 is electrically connected to the second end of the second capacitor C2, and the second end of the second capacitor C2 is electrically connected to the input end of the RC low-pass filter.

[0023] Switch S1 is controlled by the enable signal of the external microcontroller and is used to switch the feedback path during the display screen brightness adjustment process. When the switch S1 is closed, the fifth resistor R5 and the second capacitor C2 are connected in parallel to form a low-pass filter network to enhance current stability; when the switch S1 is disconnected, the circuit enters a high-impedance state to reduce power consumption.

[0024] As a further solution of the present invention: the signal conversion module includes an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC), the input end of the analog-to-digital converter is electrically connected to the output end of the RC low-pass filter, the output end of the analog-to-digital converter is electrically connected to the input end of the digital-to-analog converter, the output end of the digital-to-analog converter is electrically connected to the input end of the buffer amplifier, and the input end of the buffer amplifier is electrically connected to the display screen

[0025] The output end of the buffer amplifier is electrically connected to the brightness adjustment interface of the display screen. The analog-to-digital converter (ADC) is used to convert the analog brightness signal output by the RC low-pass filter into a digital signal and input it to the external microcontroller for real-time processing. The digital-to-analog converter (DAC) converts the digital control signal output by the microcontroller into an analog drive signal, which is amplified by the buffer amplifier and adjusts the brightness of the display screen. Combined with the bias current I biasDynamic adjustment within the range of 10μA to 1mA enables precise control of screen brightness and low-power optimization. The operating modes of the ADC and DAC are coordinated by the enable signal of the microcontroller, and automatically switch to high sampling rate or low power mode in low power state to reduce current consumption. At the same time, the buffer amplifier adopts a low-noise design to ensure signal integrity and avoid display distortion.

[0026] As a further embodiment of the present invention, the buffer amplifier includes an amplifier OPA1, a non-inverting input terminal of the amplifier OPA1 is connected to the output terminal of the digital-to-analog converter, an inverting input terminal of the amplifier OPA1 is connected to the first terminal of the sixth resistor R6 and the first terminal of the seventh resistor R7, a second terminal of the sixth resistor R6 is grounded, an output terminal of the amplifier OPA1 is connected to the base of the transistor Q1, a collector of the transistor Q1 is connected to a high level, an emitter of the transistor Q1 is electrically connected to the second terminal of the seventh resistor R7, a first terminal of the eighth resistor R8 and a display screen, and a second terminal of the eighth resistor R8 is grounded.

[0027] The buffer amplifier includes an amplifier OPA1, a non-inverting input terminal of the amplifier OPA1 is connected to the output terminal of the digital-to-analog converter, an inverting input terminal of the amplifier OPA1 is connected to the first terminal of the sixth resistor R6 and the first terminal of the seventh resistor R7, the second terminal of the sixth resistor R6 is grounded, the output terminal of the amplifier OPA1 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to a high level, the emitter of the transistor Q1 is electrically connected to the second terminal of the seventh resistor R7, the first terminal of the eighth resistor R8 and the display screen, and the second terminal of the eighth resistor R8 is grounded; wherein, the sixth resistor R6 and the seventh resistor R7 are connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to a high level, the emitter of the transistor Q1 is electrically connected to the second terminal of the seventh resistor R7, the first terminal of the eighth resistor R8 and the display screen, and the second terminal of the eighth resistor R8 is grounded; The resistance values ​​of resistor R7 are 10kΩ and 20kΩ respectively, which are used to set the closed-loop gain of amplifier OPA1 to ensure linear signal amplification. At the same time, amplifier OPA1 uses a low-noise, low-power operational amplifier model to minimize thermal noise and power consumption and improve signal integrity. Transistor Q1 uses an NPN transistor, which provides high input impedance and low output impedance as an emitter follower. It can effectively isolate the driver stage from the display screen load to avoid signal attenuation, and supports dynamic adjustment of the bias current under the control of the microcontroller enable signal to achieve smooth transition of screen brightness and low power consumption optimization.

[0028] In a second aspect, the present invention further provides a method, which is applied to the debugging circuit of the controllable low-power display on the mobile phone screen as described in the above solution.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. In the present invention, the output electrical signal is adjusted by a second operational transconductance amplifier, and multiplied by an analog multiplier to offset the output drift characteristics of the digital-to-analog converter, thereby eliminating color deviation and display distortion. Frequency modulation is achieved by multiplying the input electrical signal with the feedback signal, thereby suppressing high-frequency noise and reducing the risk of screen display distortion.

[0031] 2. In the present invention, the bias current generated by the current source I is used to inject an adjustable DC voltage into the input signal to compensate for level drift during signal transmission. By setting a first capacitor in parallel with a second resistor at the output end of the first operational transconductance amplifier, an RC low-pass filter network can be formed to effectively filter out high-frequency interference components, ensure the consistency of the amplitude and phase of the output signal, and improve the signal-to-noise ratio of the signal.

[0032] 3. In the present invention, by setting the resistance ratio of the first resistor and the second resistor to 10:1, it can be ensured that the input signal amplitude is attenuated to 1 / 11 of the original value, so as to adapt to the input voltage range of the analog multiplier and prevent signal overload or distortion; at the same time, the attenuated voltage is input to the non-inverting input terminal of the first operational transconductance amplifier through the second end of the first resistor, and combined with the transconductance gain of the first operational transconductance amplifier, precise adjustment and level matching of the input signal can be achieved, which can improve the power consumption efficiency and signal integrity of the debugging circuit.

[0033] 4. In the present invention, by setting a switch controlled by an enable signal of an external microcontroller, the feedback path can be switched during the brightness adjustment process of the display screen. When the switch is closed, the fifth resistor and the second capacitor are connected in parallel to form a low-pass filter network to enhance current stability; when the switch is disconnected, the circuit enters a high-impedance state to reduce power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a module circuit diagram of the present invention;

[0035] Figure 2 is a simulation circuit diagram of the present invention;

[0036] Figure 3 This is a circuit diagram of a buffer amplifier according to the present invention.

[0037] In the figure: 1. Temperature compensation module; 2. Input signal adjustment module; 3. Signal correction module. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0039] Example:

[0040] See also Figure 1-Figure 3 In an embodiment of the present invention, a debugging circuit and method for a controllable low-power display on a mobile phone screen are provided, comprising an input signal adjustment module 1, a temperature compensation module 2 and a signal correction module 3. The signal correction module 3 comprises an analog multiplier U, an impedance matching module and a feedback circuit. The output end of the analog multiplier U is electrically connected to the input end of the impedance matching module, the output end of the impedance matching module is electrically connected to the feedback circuit, the output end of the feedback circuit is electrically connected to the input end of the RC low-pass filter, the output end of the RC low-pass filter is electrically connected to the input end of the signal conversion module, the output end of the signal conversion module is electrically connected to the input end of the buffer amplifier, the signal correction module 3 is used to adjust the frequency of the output signal to reduce the distortion component of the output signal, the temperature compensation module 2 collects the temperature of the environment where the display screen is located in real time through an integrated temperature sensor, and converts the temperature into an electrical signal. The output electrical signal is adjusted by the second operational transconductance amplifier OTA2, and multiplied by the analog multiplier U to offset the output drift characteristics of the digital-to-analog converter (DAC), thereby eliminating color deviation and display distortion. In the signal correction module 3, the analog multiplier U realizes frequency modulation by multiplying the input electrical signal with the feedback signal to suppress high-frequency noise; the impedance matching module is set to ensure the impedance consistency of the signal transmission link to reduce the signal reflection loss. The feedback circuit samples the signal from the second end of the second capacitor C2, and generates an error signal after comparing it with the original signal. The error signal is filtered out of high-frequency interference by the RC low-pass filter, and then output to the signal conversion module for digital-to-analog conversion. The output of the signal conversion module is directly driven by the screen pixel unit after the driving capability is enhanced by the buffer amplifier, which can effectively reduce the power consumption of the display screen.

[0041] The output end of the input signal adjustment module 1 is electrically connected to the first input end of the analog multiplier U. The input signal adjustment module 1 is used to adjust the input signal V in To compensate the DC component, the input signal adjustment module 1 adjusts the input signal V in An adjustable DC voltage is injected to compensate for level drift during signal transmission. At the same time, the input signal adjustment module 1 performs preliminary amplification on the original signal by setting a first operational transconductance amplifier OTA1 to improve the signal-to-noise ratio of the signal. By connecting a second resistor R2 and a first capacitor C1 to the output end of the first operational transconductance amplifier OTA1, high-frequency interference components can be filtered out to ensure that the amplitude and phase of the signal output by the input signal adjustment module 1 are consistent.

[0042] The output end of the temperature compensation module 2 is electrically connected to the second input end of the analog multiplier U. The temperature compensation module 2 is used to convert the collected ambient temperature into an electrical signal and calculate the compensation signal value, and output the compensation signal value to the analog multiplier U to offset the signal deviation caused by temperature drift.

[0043] Preferably, the input signal adjustment module 1 includes a first operational transconductance amplifier OTA1, the non-inverting input terminal of the first operational transconductance amplifier OTA1 is electrically connected to the second terminal of the first resistor R1, the first terminal of the first resistor R1 is electrically connected to the second terminal of the current source I, and the first terminal of the current source I is connected to the input signal V in , the current source I is used to generate the bias current I bias The inverting input terminal of the first operational transconductance amplifier OTA1 is grounded, the output terminal of the first operational transconductance amplifier OTA1 is electrically connected to the first terminal of the second resistor R2, the second terminal of the second resistor R2 is electrically connected to the first input terminal of the analog multiplier U, and the two ends of the second resistor R2 are connected in parallel with a first capacitor C1, wherein the bias current I generated by the current source I bias For input signal V in An adjustable DC voltage is injected to compensate for level drift during signal transmission; the first capacitor C1 and the second resistor R2 are connected in parallel to form an RC low-pass filter network, which can effectively filter out high-frequency interference components, ensure the consistency of the amplitude and phase of the output signal, and improve the signal-to-noise ratio of the signal.

[0044] Preferably, the first resistor R1 and the second resistor R2 form a voltage divider circuit, which is used to divide the input signal V in Perform preliminary attenuation to obtain the attenuation voltage V div :

[0045] ; Among them, the resistance ratio of the first resistor R1 and the second resistor R2 is 10:1

[0046] The voltage divider circuit is formed by setting the first resistor R1 and the second resistor R2 to divide the input signal V in Perform preliminary attenuation to obtain the attenuation voltage V div Among them, by setting the resistance ratio of the first resistor R1 and the second resistor R2 to 10:1, it can ensure that the input signal amplitude is attenuated to 1 / 11 of the original value to adapt to the input voltage range of the analog multiplier U and prevent signal overload or distortion; at the same time, the attenuation voltage V div The second end of the first resistor R1 is input to the non-inverting input end of the first operational transconductance amplifier OTA1, and combined with the transconductance gain of the first operational transconductance amplifier OTA1, precise adjustment and level matching of the input signal are achieved, which can improve the power consumption efficiency and signal integrity of the debugging circuit.

[0047] Preferably, the voltage V of the feedback signal of the input signal adjustment module 1 is temp for:

[0048] , where A is V adjis the amplification gain of the first operational transconductance amplifier OTA1, V adj Adjust voltage for bias;

[0049] The bias adjustment voltage is: , where V adj Adjust voltage for bias;

[0050] Bias current I bias 10μA~1mA

[0051] The amplification gain of the first operational transconductance amplifier OTA1 can control the signal amplitude and improve the control accuracy of the signal amplitude; adj As a bias adjustment voltage, level matching is achieved by combining input attenuation and bias current, and by setting the bias current I bias The current consumption is 10μA~1mA, which can minimize the current consumption in low power mode and provide sufficient driving capability when the signal integrity requirement is high. bias , to match the changes in the brightness of the mobile phone screen and improve the energy efficiency and response accuracy of the overall debugging circuit.

[0052] The temperature compensation module 2 includes a temperature sensor and a second operational transconductance amplifier OTA2. The output end of the temperature sensor is electrically connected to the non-inverting input end of the second operational transconductance amplifier OTA2. The inverting input end of the second operational transconductance amplifier OTA2 is connected to the bias voltage V ref The output terminal of the second operational transconductance amplifier OTA2 is electrically connected to the load resistor R L The first end of the load resistor R L The second end of the second operational transconductance amplifier OTA2 is electrically connected to the second input end of the analog multiplier U. The second operational transconductance amplifier OTA2 is used to input the compensation voltage V to the second input end of the analog multiplier U. comp .

[0053] Compensation voltage V comp for:

[0054] , where g m is the transconductance of the second operational transconductance amplifier OTA2, (V t -V ref ) is the input voltage difference, which can represent the difference between the temperature sensor output voltage and the reference voltage, and directly reflect the temperature change through the difference. The compensation voltage V comp By inputting the electrical signal adjusted according to the temperature into the second input terminal of the analog multiplier U, real-time compensation for the temperature drift of the circuit can be achieved, ensuring that the bias current I bias The stability is not affected by temperature, which helps to reduce the current consumption of the display screen while ensuring the driving capability when high signal integrity requirements are required.

[0055] Preferably, the analog multiplier U is used to output a nonlinear transformation voltage, and the nonlinear transformation voltage is:

[0056] , where K is the analog multiplier scaling factor and λ is the gamma parameter.

[0057] Preferably, the impedance matching module is a third resistor R3, the first end of the third resistor R3 is electrically connected to the output end of the analog multiplier U, the second end of the third resistor R3 is electrically connected to the input end of the feedback circuit, and the third resistor R3 is used to match the impedance between the analog multiplier U and the feedback circuit to suppress common-mode noise.

[0058] Preferably, the feedback circuit includes a third operational transconductance amplifier OTA3, a non-inverting input terminal of the third operational transconductance amplifier OTA3 is electrically connected to the second end of the third resistor R3 and the first end of the fourth resistor R4, an inverting input terminal of the third operational transconductance amplifier OTA3 is grounded, an output terminal of the third operational transconductance amplifier OTA3 is electrically connected to the first end of the second capacitor C2 and the first end of the switch S1, the first end of the second capacitor C2 is electrically connected to the first end of the fifth resistor R5, the first end of the fifth resistor R5 is grounded, the second end of the switch S1 is electrically connected to the second end of the fifth resistor R5, the second end of the fourth resistor R4 is electrically connected to the second end of the second capacitor C2, and the second end of the second capacitor C2 is electrically connected to the input terminal of the RC low-pass filter.

[0059] Switch S1 is controlled by the enable signal of the external microcontroller and is used to switch the feedback path during the display screen brightness adjustment process. When the switch S1 is closed, the fifth resistor R5 and the second capacitor C2 are connected in parallel to form a low-pass filter network to enhance current stability; when the switch S1 is disconnected, the circuit enters a high-impedance state to reduce power consumption.

[0060] Preferably, the signal conversion module includes an analog-to-digital converter and a digital-to-analog converter, the input end of the analog-to-digital converter is electrically connected to the output end of the RC low-pass filter, the output end of the analog-to-digital converter is electrically connected to the input end of the digital-to-analog converter, the output end of the digital-to-analog converter is electrically connected to the input end of the buffer amplifier, and the input end of the buffer amplifier is electrically connected to the display screen.

[0061] The output end of the buffer amplifier is electrically connected to the brightness adjustment interface of the display screen. The analog-to-digital converter (ADC) is used to convert the analog brightness signal output by the RC low-pass filter into a digital signal and input it to the external microcontroller for real-time processing. The digital-to-analog converter converts the digital control signal output by the microcontroller into an analog drive signal, which is amplified by the buffer amplifier to adjust the brightness of the display screen. Combined with the bias current I biasDynamic adjustment within the range of 10μA to 1mA enables precise control of screen brightness and low-power optimization. The operating modes of the ADC and DAC are coordinated by the enable signal of the microcontroller, and automatically switch to high sampling rate or low power mode in low power state to reduce current consumption. At the same time, the buffer amplifier adopts a low-noise design to ensure signal integrity and avoid display distortion.

[0062] Preferably, the buffer amplifier includes an amplifier OPA1, a non-inverting input terminal of the amplifier OPA1 is connected to the output terminal of the digital-to-analog converter, an inverting input terminal of the amplifier OPA1 is connected to the first terminal of the sixth resistor R6 and the first terminal of the seventh resistor R7, a second terminal of the sixth resistor R6 is grounded, an output terminal of the amplifier OPA1 is connected to the base of the transistor Q1, a collector of the transistor Q1 is connected to a high level, an emitter of the transistor Q1 is electrically connected to the second terminal of the seventh resistor R7, a first terminal of the eighth resistor R8 and the display screen, and a second terminal of the eighth resistor R8 is grounded

[0063] The buffer amplifier includes an amplifier OPA1, a non-inverting input terminal of the amplifier OPA1 is connected to the output terminal of the digital-to-analog converter, an inverting input terminal of the amplifier OPA1 is connected to the first terminal of the sixth resistor R6 and the first terminal of the seventh resistor R7, the second terminal of the sixth resistor R6 is grounded, the output terminal of the amplifier OPA1 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to a high level, the emitter of the transistor Q1 is electrically connected to the second terminal of the seventh resistor R7, the first terminal of the eighth resistor R8 and the display screen, and the second terminal of the eighth resistor R8 is grounded; wherein, the sixth resistor R6 and the seventh resistor R7 are connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to a high level, the emitter of the transistor Q1 is electrically connected to the second terminal of the seventh resistor R7, the first terminal of the eighth resistor R8 and the display screen, and the second terminal of the eighth resistor R8 is grounded; The resistance values ​​of resistor R7 are 10kΩ and 20kΩ respectively, which are used to set the closed-loop gain of amplifier OPA1 to ensure linear signal amplification. At the same time, amplifier OPA1 uses a low-noise, low-power operational amplifier model to minimize thermal noise and power consumption and improve signal integrity. Transistor Q1 uses an NPN transistor, which provides high input impedance and low output impedance as an emitter follower. It can effectively isolate the driver stage from the display screen load to avoid signal attenuation, and supports dynamic adjustment of the bias current under the control of the microcontroller enable signal to achieve smooth transition of screen brightness and low power consumption optimization.

[0064] Preferably, the model of the amplifier OPA1 is LMV321.

[0065] Preferably, the model of transistor Q1 is BC547.

[0066] The present invention also provides a method, which is applied to the debugging circuit of the mobile phone screen controllable low-power display as the above solution.

[0067] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A debugging circuit for controllable low-power display on a mobile phone screen, characterized in that: include: A signal correction module, the signal correction module comprising an analog multiplier U, an impedance matching module, and a feedback circuit, the output end of the analog multiplier U being electrically connected to the input end of the impedance matching module, the output end of the impedance matching module being electrically connected to the feedback circuit, the output end of the feedback circuit being electrically connected to the input end of an RC low-pass filter, the output end of the RC low-pass filter being electrically connected to the input end of a signal conversion module, the output end of the signal conversion module being electrically connected to the input end of a buffer amplifier, the signal correction module being configured to adjust the frequency of an output signal to reduce a distortion component of the output signal; An input signal adjustment module, wherein the output end of the input signal adjustment module is electrically connected to the first input end of the analog multiplier U, and the input signal adjustment module is used to adjust the input signal V in Compensation of DC component; A temperature compensation module, wherein the output end of the temperature compensation module is electrically connected to the second input end of the analog multiplier U. The temperature compensation module is used to convert the collected ambient temperature into an electrical signal and calculate the compensation signal value, and output the compensation signal value to the analog multiplier U to offset the signal deviation caused by temperature drift.

2. The debugging circuit for controllable low-power display on a mobile phone screen according to claim 1, characterized in that: The input signal adjustment module includes a first operational transconductance amplifier OTA1, the non-inverting input terminal of the first operational transconductance amplifier OTA1 is electrically connected to the second terminal of the first resistor R1, the first terminal of the first resistor R1 is electrically connected to the second terminal of the current source I, and the first terminal of the current source I is connected to the input signal V in , the current source I is used to generate the bias current I bias The inverting input terminal of the first operational transconductance amplifier OTA1 is grounded, the output terminal of the first operational transconductance amplifier OTA1 is electrically connected to the first end of the second resistor R2, the second end of the second resistor R2 is electrically connected to the first input terminal of the analog multiplier U, and the two ends of the second resistor R2 are connected in parallel with a first capacitor C1.

3. The debugging circuit for controllable low-power display on a mobile phone screen according to claim 2, characterized in that: The first resistor R1 and the second resistor R2 form a voltage divider circuit, which is used to divide the input signal V in Perform preliminary attenuation to obtain the attenuation voltage V div : ; Among them, the resistance ratio of the first resistor R1 and the second resistor R2 is 10:

1.

4. The debugging circuit for controllable low-power display on a mobile phone screen according to claim 3, characterized in that: The bias current I bias 10μA~1mA; The temperature compensation module includes a temperature sensor and a second operational transconductance amplifier OTA2. The output end of the temperature sensor is electrically connected to the non-inverting input end of the second operational transconductance amplifier OTA2. The inverting input end of the second operational transconductance amplifier OTA2 is connected to the bias voltage V ref The output terminal of the second operational transconductance amplifier OTA2 is electrically connected to the load resistor R L The first end of the load resistor R L The second end of the second operational transconductance amplifier OTA2 is electrically connected to the second input end of the analog multiplier U, and the second operational transconductance amplifier OTA2 is used to input the compensation voltage V to the second input end of the analog multiplier U. comp .

5. The debugging circuit for controllable low-power display on a mobile phone screen according to claim 1, characterized in that: The analog multiplier U is used to output a nonlinear conversion voltage, and the nonlinear conversion voltage is: , where K is the analog multiplier scaling factor and λ is the gamma parameter.

6. The debugging circuit for controllable low-power display on a mobile phone screen according to claim 5, characterized in that: The impedance matching module is a third resistor R3, a first end of the third resistor R3 is electrically connected to the output end of the analog multiplier U, and a second end of the third resistor R3 is electrically connected to the input end of the feedback circuit. The third resistor R3 is used to match the impedance between the analog multiplier U and the feedback circuit to suppress common-mode noise.

7. The debugging circuit for controllable low-power display on a mobile phone screen according to claim 6, characterized in that: The feedback circuit includes a third operational transconductance amplifier OTA3, a non-inverting input terminal of the third operational transconductance amplifier OTA3 is electrically connected to the second end of the third resistor R3 and the first end of the fourth resistor R4, an inverting input terminal of the third operational transconductance amplifier OTA3 is grounded, an output terminal of the third operational transconductance amplifier OTA3 is electrically connected to the first end of the second capacitor C2 and the first end of the switch S1, the first end of the second capacitor C2 is electrically connected to the first end of the fifth resistor R5, the first end of the fifth resistor R5 is grounded, the second end of the switch S1 is electrically connected to the second end of the fifth resistor R5, the second end of the fourth resistor R4 is electrically connected to the second end of the second capacitor C2, and the second end of the second capacitor C2 is electrically connected to the input terminal of the RC low-pass filter.

8. The debugging circuit for controllable low-power display on a mobile phone screen according to claim 7, characterized in that: The signal conversion module includes an analog-to-digital converter and a digital-to-analog converter. The input end of the analog-to-digital converter is electrically connected to the output end of the RC low-pass filter, the output end of the analog-to-digital converter is electrically connected to the input end of the digital-to-analog converter, the output end of the digital-to-analog converter is electrically connected to the input end of the buffer amplifier, and the input end of the buffer amplifier is electrically connected to the display screen.

9. The debugging circuit for controllable low-power display on a mobile phone screen according to claim 8, characterized in that: The buffer amplifier includes an amplifier OPA1, a non-inverting input terminal of the amplifier OPA1 is connected to the output terminal of the digital-to-analog converter, an inverting input terminal of the amplifier OPA1 is connected to the first end of the sixth resistor R6 and the first end of the seventh resistor R7, the second end of the sixth resistor R6 is grounded, the output terminal of the amplifier OPA1 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to a high level, the emitter of the transistor Q1 is electrically connected to the second end of the seventh resistor R7, the first end of the eighth resistor R8 and the display screen, and the second end of the eighth resistor R8 is grounded.

10. A method, characterized in that The method is applied to the debugging circuit for the controllable low-power display on a mobile phone screen as described in any one of claims 1 to 9.

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