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

Abstract

The application discloses a mobile phone screen controllable low-power consumption display debugging circuit and method in the technical field of mobile phone screens, which comprises an input signal adjusting module, a temperature compensation module and a signal correction module, the signal correction module 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 an RC low-pass filter, and the output end of the RC low-pass filter is electrically connected with the input end of a signal conversion module. The application adjusts the output electric signal through a second operational transconductance amplifier, carries out multiplication operation through an analog multiplier to offset the output drift characteristics of a digital-to-analog converter, thereby eliminating color deviation and display distortion, realizes frequency modulation by multiplying the input electric signal with a feedback signal, suppresses high-frequency noise and reduces the risk of screen display distortion.

Description

Technical Field

[0001] This invention relates to the field of mobile phone screen technology, specifically a debugging circuit and method for controllable low-power display of mobile phone screen. Background Technology

[0002] Most current smartphone screens are either LCD or OLED. LCD screens require backlighting to illuminate the screen, and this backlighting needs to operate continuously regardless of the content being displayed, resulting in relatively higher overall power consumption. LCD screens generally consume more power than OLED screens. OLED screens typically consume between 0.1W and 1.5W. Because each pixel in an OLED screen emits light independently, compared to LCD screens, OLED screens consume less power when displaying dark content such as black, as the pixels do not emit light. However, OLED screens consume relatively more power when displaying bright content such as white.

[0003] Existing screen power consumption display debugging circuits suffer from color deviation due to the drift of the output voltage of the digital-to-analog converter (DAC) with temperature changes, which in turn leads to screen display distortion. Summary of the Invention

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

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a debugging circuit and method for a controllable low-power display on a mobile phone screen, including an input signal adjustment module, a temperature compensation module, and a signal correction module. The signal correction module includes an analog multiplier U, an impedance matching module, and a feedback circuit. The output of the analog multiplier U is electrically connected to the input of the impedance matching module, the output of the impedance matching module is electrically connected to the feedback circuit, the output of the feedback circuit is electrically connected to the input of an RC low-pass filter, the output of the RC low-pass filter is electrically connected to the input of a signal conversion module, and the output of the signal conversion module is electrically connected to the input of a buffer amplifier. The signal correction module is used to adjust the frequency of the output signal to reduce distortion components. The temperature compensation module collects the ambient temperature of the display screen in real time through an integrated temperature sensor and converts the temperature through a temperature converter. The signal is converted into an electrical signal, which is then adjusted by the second operational transconductance amplifier OTA2. The output electrical signal is then multiplied by the analog multiplier U to cancel 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 achieves frequency modulation by multiplying the input electrical signal with the feedback signal to suppress high-frequency noise. An impedance matching module is set up to ensure the impedance consistency of the signal transmission link to reduce signal reflection loss. The feedback circuit samples the signal from the second terminal of the second capacitor C2, compares it with the original signal to generate an error signal, and then filters out high-frequency interference by an RC low-pass filter before outputting it to the signal conversion module for digital-to-analog conversion. The output of the signal conversion module is then enhanced by a buffer amplifier to drive the screen pixel units, which can effectively reduce the power consumption of the display screen.

[0007] The output terminal of the input signal adjustment module is electrically connected to the first input terminal 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 amplifies the original signal by setting the first operational transconductance amplifier OTA1 to improve the signal-to-noise ratio. By connecting the second resistor R2 and the first capacitor C1 to the output 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 of the temperature compensation module is electrically connected to the second input 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 aspect 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 a first resistor R1, the first terminal of the first resistor R1 is electrically connected to the second terminal of a current source I, and the first terminal of the current source I is connected to the input signal V. in Current source I is used to generate bias current I bias The inverting input of the first operational transconductance amplifier OTA1 is grounded. The output 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 of the analog multiplier U. A first capacitor C1 is connected in parallel across the two ends of the second resistor R2. The bias current I generated by the current source I... bias Used to 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 amplitude and phase of the output signal are consistent, and improve the signal-to-noise ratio of the signal.

[0010] As a further aspect of the present invention: the first resistor R1 and the second resistor R2 constitute a voltage divider circuit, the voltage divider circuit being used to divide the input signal V in Preliminary attenuation is performed to obtain the attenuation voltage V. div :

[0011] The resistance ratio of the first resistor and the second resistor is .

[0012] A voltage divider circuit is formed by setting the first resistor R1 and the second resistor R2. The voltage divider circuit is used to divide the input signal V. in Preliminary attenuation is performed to obtain the attenuation voltage V. div Specifically, by setting the resistance ratio of the first resistor R1 and the second resistor R2 to 10:1, the input signal amplitude can be attenuated to 1 / 11 of its original value to adapt to the input voltage range of the analog multiplier U and prevent signal overload or distortion; simultaneously, the attenuation voltage V div The input signal is fed through the second terminal of the first resistor R1 to the non-inverting input terminal of the first operational transconductance amplifier OTA1. Combined with the transconductance gain of the first operational transconductance amplifier OTA1, the input signal can be precisely adjusted and level matched, which can improve the power consumption efficiency and signal integrity of the debugging circuit.

[0013] As a further aspect of the present invention: the voltage V of the feedback signal of the input signal adjustment module temp for:

[0014] Where A is V adj V is the amplification gain of the first operational transconductance amplifier OTA1.adj For bias adjustment voltage;

[0015] The bias adjustment voltage is: , where V adj For bias adjustment voltage;

[0016] Bias current is

[0017] The amplification gain of the first operational transconductance amplifier OTA1 can control the signal amplitude, improving the control accuracy of the signal amplitude; V adj As a bias adjustment voltage, level matching is achieved by combining input attenuation and bias current, and the bias current I is set accordingly. bias With a current rating of 10μA~1mA, it can minimize current consumption in low-power mode while providing sufficient drive capability when signal integrity requirements are high. This can be achieved by adjusting IA. bias This is to match changes in the brightness of the mobile phone screen and improve the overall energy efficiency and response accuracy of the debugging circuit.

[0018] The temperature compensation module includes a temperature sensor and a second operational transconductance amplifier OTA2. The output of the temperature sensor is electrically connected to the non-inverting input of the second operational transconductance amplifier OTA2, and the inverting input of the second operational transconductance amplifier OTA2 is connected to a bias voltage V. ref The output of the second operational transconductance amplifier OTA2 is electrically connected to the load resistor R. L The first terminal, load resistor R L The second terminal is electrically connected to the second input terminal of the analog multiplier U, and the second operational transconductance amplifier OTA2 is used to input a compensation voltage V to the second input terminal of the analog multiplier U. comp .

[0019] The compensation voltage V comp for:

[0020] , where g m It is the transconductance of the second operational transconductance amplifier OTA2, (V t -V ref The input voltage difference represents the difference between the temperature sensor's output voltage and the reference voltage, directly reflecting the temperature change. The compensation voltage V... comp By inputting a temperature-adjustable electrical signal to the second input terminal of the analog multiplier U, real-time compensation for circuit temperature drift can be achieved, ensuring that the bias current I remains constant during mobile phone screen brightness adjustment. bias Its stability is unaffected by temperature, which helps reduce the current consumption of the display screen while ensuring driving capability when signal integrity requirements are high.

[0021] As a further aspect of the present invention: the analog multiplier U is used to output a nonlinear transformed voltage, the nonlinear transformed voltage being:

[0022] , where K is the scaling factor of the analog multiplier and λ is the gamma parameter.

[0023] As a further aspect 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 terminal of the analog multiplier U, and the second end of the third resistor R3 is electrically connected to the input terminal 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.

[0024] As a further embodiment of the present invention: the feedback circuit includes a third operational transconductance amplifier OTA3. The non-inverting input terminal of the third operational transconductance amplifier OTA3 is electrically connected to the second terminal of the third resistor R3 and the first terminal of the fourth resistor R4. The inverting input terminal of the third operational transconductance amplifier OTA3 is grounded. The output terminal of the third operational transconductance amplifier OTA3 is electrically connected to the first terminal of the second capacitor C2 and the first terminal of the switch S1. The first terminal of the second capacitor C2 is electrically connected to the first terminal of the fifth resistor R5, and the first terminal of the fifth resistor R5 is grounded. The second terminal of the switch S1 is electrically connected to the second terminal of the fifth resistor R5. The second terminal of the fourth resistor R4 is electrically connected to the second terminal of the second capacitor C2. The second terminal of the second capacitor C2 is electrically connected to the input terminal of the RC low-pass filter.

[0025] Switch S1 is controlled by the enable signal of an external microcontroller and is used to switch the feedback path during the brightness adjustment of the display screen. When 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 switch S1 is open, the circuit enters a high-impedance state to reduce power consumption.

[0026] As a further aspect of the present invention: the signal conversion module includes an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC). The input terminal of the ADC is electrically connected to the output terminal of an RC low-pass filter, the output terminal of the ADC is electrically connected to the input terminal of the DAC, the output terminal of the DAC is electrically connected to the input terminal of a buffer amplifier, and the input terminal of the buffer amplifier is electrically connected to a display screen.

[0027] The output of the buffer amplifier is electrically connected to the brightness adjustment interface of the display screen. The analog-to-digital converter (ADC) converts the analog brightness signal output from the RC low-pass filter into a digital signal, which is then input to an external microcontroller for real-time processing. The digital-to-analog converter (DAC) converts the digital control signal output from the microcontroller into an analog drive signal, which is then amplified by the buffer amplifier to adjust the brightness of the display screen, in conjunction 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 controlled collaboratively by the enable signal of the microcontroller, automatically switching 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.

[0028] As a further aspect of the present invention: the buffer amplifier includes an amplifier OPA1. The non-inverting input terminal of the amplifier OPA1 is connected to the output terminal of the digital-to-analog converter. The 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 a 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. The second terminal of the eighth resistor R8 is grounded.

[0029] The buffer amplifier includes amplifier OPA1. The non-inverting input of amplifier OPA1 is connected to the output of the digital-to-analog converter. The inverting input of 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 of amplifier OPA1 is connected to the base of transistor Q1. The collector of transistor Q1 is connected to a high level. The emitter of 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. The second terminal of the eighth resistor R8 is grounded. The sixth resistor R6 and the seventh resistor R7 are connected to the base of transistor Q1. The resistors R7 have values ​​of 10kΩ and 20kΩ, respectively, and are used to set the closed-loop gain of the amplifier OPA1 to ensure linear signal amplification. At the same time, the amplifier OPA1 is selected as a low-noise, low-power operational amplifier model to minimize thermal noise and power consumption and improve signal integrity. The transistor Q1 is an NPN transistor, which acts as an emitter follower to provide high input impedance and low output impedance. It can effectively isolate the driver stage from the display screen load, avoid signal attenuation, and support dynamic adjustment of bias current under the control of the microcontroller enable signal to achieve smooth transition of screen brightness and low power consumption optimization.

[0030] Secondly, the present invention also provides a method applied to the debugging circuit of a controllable low-power display for a mobile phone screen as described above.

[0031] Compared with the prior art, the beneficial effects of the present invention are:

[0032] 1. In this invention, the output electrical signal is adjusted by the second operational transconductance amplifier, and the multiplication operation is performed by the analog multiplier to cancel 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.

[0033] 2. In this 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 the level drift during signal transmission. By setting a first capacitor and a second resistor in parallel at the output 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 amplitude and phase of the output signal are consistent, and improve the signal-to-noise ratio of the signal.

[0034] 3. In this invention, by setting the resistance ratio of the first resistor and the second resistor to 10:1, it is possible to ensure that the amplitude of the input signal is attenuated to 1 / 11 of its 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 terminal of the first resistor, and combined with the transconductance gain of the first operational transconductance amplifier, the 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.

[0035] 4. In this invention, by setting a switch controlled by the enable signal of an external microcontroller, the feedback path can be switched during the brightness adjustment 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 open, the circuit enters a high-impedance state to reduce power consumption. Attached Figure Description

[0036] Figure 1 This is a circuit diagram of the module of the present invention;

[0037] Figure 2 This is an analog circuit diagram of the present invention;

[0038] Figure 3 This is a circuit diagram of the buffer amplifier of the present invention.

[0039] In the diagram: 1. Temperature compensation module; 2. Input signal adjustment module; 3. Signal correction module. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Example:

[0042] Please see Figures 1-3 In this embodiment of the invention, a debugging circuit and method for a controllable low-power display on a mobile phone screen includes an input signal adjustment module 1, a temperature compensation module 2, and a signal correction module 3. The signal correction module 3 includes an analog multiplier U, an impedance matching module, and a feedback circuit. The output of the analog multiplier U is electrically connected to the input of the impedance matching module, the output of the impedance matching module is electrically connected to the feedback circuit, the output of the feedback circuit is electrically connected to the input of an RC low-pass filter, the output of the RC low-pass filter is electrically connected to the input of a signal conversion module, and the output of the signal conversion module is electrically connected to the input of a buffer amplifier. The signal correction module 3 is used to adjust the frequency of the output signal to reduce the distortion components 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 electrical signals. The signal is adjusted by the second operational transconductance amplifier OTA2, and then multiplied by the analog multiplier U to cancel 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 achieves frequency modulation by multiplying the input electrical signal with the feedback signal to suppress high-frequency noise. The impedance matching module ensures the impedance consistency of the signal transmission link to reduce signal reflection loss. The feedback circuit samples the signal from the second terminal of the second capacitor C2, compares it with the original signal to generate an error signal, and then filters out high-frequency interference by an RC low-pass filter before outputting it to the signal conversion module for digital-to-analog conversion. The output of the signal conversion module is enhanced by a buffer amplifier and then directly drives the screen pixel unit, which can effectively reduce the power consumption of the display screen.

[0043] The output of input signal adjustment module 1 is electrically connected to the first input of analog multiplier U. Input signal adjustment module 1 is used to adjust the input signal V. in To compensate for 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 amplifies the original signal by setting the first operational transconductance amplifier OTA1 to improve the signal-to-noise ratio. By connecting the second resistor R2 and the first capacitor C1 to the output terminal 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.

[0044] The output of temperature compensation module 2 is electrically connected to the second input of analog multiplier U. 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 analog multiplier U to offset the signal deviation caused by temperature drift.

[0045] 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 a first resistor R1. The first terminal of the first resistor R1 is electrically connected to the second terminal of a current source I. The first terminal of the current source I is connected to the input signal V. in Current source I is used to generate bias current I bias The inverting input of the first operational transconductance amplifier OTA1 is grounded. The output 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 of the analog multiplier U. A first capacitor C1 is connected in parallel across the two ends of the second resistor R2. The bias current I generated by the current source I... bias Used to 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 amplitude and phase of the output signal are consistent, and improve the signal-to-noise ratio of the signal.

[0046] 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 Preliminary attenuation is performed to obtain the attenuation voltage V. div :

[0047] The resistance ratio of the first resistor R1 to the second resistor R2 is 10:1.

[0048] A voltage divider circuit is constructed by setting a first resistor R1 and a second resistor R2. The voltage divider circuit is used to divide the input signal V. in Preliminary attenuation is performed to obtain the attenuation voltage V. div Specifically, by setting the resistance ratio of the first resistor R1 and the second resistor R2 to 10:1, the input signal amplitude can be attenuated to 1 / 11 of its original value to adapt to the input voltage range of the analog multiplier U and prevent signal overload or distortion; simultaneously, the attenuation voltage V div The input signal is fed through the second terminal of the first resistor R1 to the non-inverting input terminal of the first operational transconductance amplifier OTA1. Combined with the transconductance gain of the first operational transconductance amplifier OTA1, the input signal can be precisely adjusted and level matched, which can improve the power consumption efficiency and signal integrity of the debugging circuit.

[0049] Preferably, the voltage V of the feedback signal from the input signal adjustment module 1 temp for:

[0050] Where A is V adjV is the amplification gain of the first operational transconductance amplifier OTA1. adj For bias adjustment voltage;

[0051] The bias adjustment voltage is: , where V adj For bias adjustment voltage;

[0052] Bias current I bias 10μA~1mA

[0053] The amplification gain of the first operational transconductance amplifier OTA1 can control the signal amplitude, improving the control accuracy of the signal amplitude; V adj As a bias adjustment voltage, level matching is achieved by combining input attenuation and bias current, and the bias current I is set accordingly. bias With a current rating of 10μA~1mA, it can minimize current consumption in low-power mode while providing sufficient drive capability when signal integrity requirements are high. This can be achieved by adjusting IA. bias This is to match changes in the brightness of the mobile phone screen and improve the overall energy efficiency and response accuracy of the debugging circuit.

[0054] Temperature compensation module 2 includes a temperature sensor and a second operational transconductance amplifier OTA2. The output of the temperature sensor is electrically connected to the non-inverting input of the second operational transconductance amplifier OTA2, and the inverting input of the second operational transconductance amplifier OTA2 is connected to a bias voltage V. ref The output of the second operational transconductance amplifier OTA2 is electrically connected to the load resistor R. L The first terminal, load resistor R L The second terminal is electrically connected to the second input terminal of the analog multiplier U. The second operational transconductance amplifier OTA2 is used to input a compensation voltage V to the second input terminal of the analog multiplier U. comp .

[0055] Compensation voltage V comp for:

[0056] , where g m It is the transconductance of the second operational transconductance amplifier OTA2, (V t -V ref The input voltage difference represents the difference between the temperature sensor's output voltage and the reference voltage, directly reflecting the temperature change. The compensation voltage V... comp By inputting a temperature-adjustable electrical signal to the second input terminal of the analog multiplier U, real-time compensation for circuit temperature drift can be achieved, ensuring that the bias current I remains constant during mobile phone screen brightness adjustment. bias Its stability is unaffected by temperature, which helps reduce the current consumption of the display screen while ensuring driving capability when signal integrity requirements are high.

[0057] Preferably, the analog multiplier U is used to output a nonlinear transformed voltage, which is:

[0058] Where K is the scaling factor of the analog multiplier and λ is the gamma parameter.

[0059] 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, 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.

[0060] Preferably, the feedback circuit includes a third operational transconductance amplifier OTA3. The non-inverting input of the third operational transconductance amplifier OTA3 is electrically connected to the second terminal of the third resistor R3 and the first terminal of the fourth resistor R4. The inverting input of the third operational transconductance amplifier OTA3 is grounded. The output of the third operational transconductance amplifier OTA3 is electrically connected to the first terminal of the second capacitor C2 and the first terminal of the switch S1. The first terminal of the second capacitor C2 is electrically connected to the first terminal of the fifth resistor R5, and the first terminal of the fifth resistor R5 is grounded. The second terminal of the switch S1 is electrically connected to the second terminal of the fifth resistor R5. The second terminal of the fourth resistor R4 is electrically connected to the second terminal of the second capacitor C2. The second terminal of the second capacitor C2 is electrically connected to the input of the RC low-pass filter.

[0061] Switch S1 is controlled by the enable signal of an external microcontroller and is used to switch the feedback path during the brightness adjustment of the display screen. When 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 switch S1 is open, the circuit enters a high-impedance state to reduce power consumption.

[0062] Preferably, the signal conversion module includes an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC). The input terminal of the ADC is electrically connected to the output terminal of an RC low-pass filter, the output terminal of the ADC is electrically connected to the input terminal of the DAC, the output terminal of the DAC is electrically connected to the input terminal of a buffer amplifier, and the input terminal of the buffer amplifier is electrically connected to a display screen.

[0063] The output of the buffer amplifier is electrically connected to the brightness adjustment interface of the display screen. The analog-to-digital converter (ADC) converts the analog brightness signal output from the RC low-pass filter into a digital signal, which is then input to an external microcontroller for real-time processing. The digital-to-analog converter (DAC) converts the digital control signal output from the microcontroller into an analog drive signal, which is amplified by the buffer amplifier to adjust the brightness of the display screen, in conjunction 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 controlled collaboratively by the enable signal of the microcontroller, automatically switching 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.

[0064] Preferably, the buffer amplifier includes amplifier OPA1. The non-inverting input of amplifier OPA1 is connected to the output of the digital-to-analog converter. The inverting input of 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 of amplifier OPA1 is connected to the base of transistor Q1. The collector of transistor Q1 is connected to a high level. The emitter of 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. The second terminal of the eighth resistor R8 is grounded.

[0065] The buffer amplifier includes amplifier OPA1. The non-inverting input of amplifier OPA1 is connected to the output of the digital-to-analog converter. The inverting input of 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 of amplifier OPA1 is connected to the base of transistor Q1. The collector of transistor Q1 is connected to a high level. The emitter of 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. The second terminal of the eighth resistor R8 is grounded. The sixth resistor R6 and the seventh resistor R7 are connected to the base of transistor Q1. The resistors R7 have values ​​of 10kΩ and 20kΩ, respectively, and are used to set the closed-loop gain of the amplifier OPA1 to ensure linear signal amplification. At the same time, the amplifier OPA1 is selected as a low-noise, low-power operational amplifier model to minimize thermal noise and power consumption and improve signal integrity. The transistor Q1 is an NPN transistor, which acts as an emitter follower to provide high input impedance and low output impedance. It can effectively isolate the driver stage from the display screen load, avoid signal attenuation, and support dynamic adjustment of bias current under the control of the microcontroller enable signal to achieve smooth transition of screen brightness and low power consumption optimization.

[0066] Preferably, the amplifier OPA1 is model LMV321.

[0067] Preferably, the transistor Q1 is model BC547.

[0068] The present invention also provides a method for applying to the debugging circuit of a controllable low-power display for a mobile phone screen as described above.

[0069] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A debugging circuit for a controllable low-power display on a mobile phone screen, characterized in that, include: The signal correction module includes an analog multiplier U, an impedance matching module, and a feedback circuit. The output of the analog multiplier U is electrically connected to the input of the impedance matching module, the output of the impedance matching module is electrically connected to the feedback circuit, the output of the feedback circuit is electrically connected to the input of an RC low-pass filter, the output of the RC low-pass filter is electrically connected to the input of a signal conversion module, and the output of the signal conversion module is electrically connected to the input of a buffer amplifier. The signal correction module is used to adjust the frequency of the output signal to reduce the distortion components of the output signal. An input signal adjustment module, the output of which is electrically connected to the first input of an analog multiplier U, is used to adjust the input signal V. in Compensation for DC component; 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 a first resistor R1, the first terminal of the first resistor R1 is electrically connected to the second terminal of a current source I, and the first terminal of the current source I is connected to the input signal V. in Current source I is used to generate 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 a first capacitor C1 is connected in parallel across the two terminals of the second resistor R2; A temperature compensation module is provided, the output of which is electrically connected to the second input 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 of a mobile phone screen according to claim 1, 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 Preliminary attenuation is performed to obtain the attenuation voltage V. div : The resistance ratio of the first resistor R1 to the second resistor R2 is 10:

1.

3. The debugging circuit for controllable low-power display of a mobile phone screen according to claim 2, characterized in that: The bias current I bias The range is 10μA to 1mA. The temperature compensation module includes a temperature sensor and a second operational transconductance amplifier OTA2. The output of the temperature sensor is electrically connected to the non-inverting input of the second operational transconductance amplifier OTA2, and the inverting input of the second operational transconductance amplifier OTA2 is connected to a bias voltage V. ref The output of the second operational transconductance amplifier OTA2 is electrically connected to the load resistor R. L The first terminal, load resistor R L The second terminal is electrically connected to the second input terminal of the analog multiplier U, and the second operational transconductance amplifier OTA2 is used to input a compensation voltage V to the second input terminal of the analog multiplier U. comp .

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

5. The debugging circuit for controllable low-power display of a mobile phone screen according to claim 4, characterized in that: 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.

6. The debugging circuit for controllable low-power display of a mobile phone screen according to claim 5, characterized in that: The feedback circuit includes a third operational transconductance amplifier OTA3. The non-inverting input of the third operational transconductance amplifier OTA3 is electrically connected to the second terminal of the third resistor R3 and the first terminal of the fourth resistor R4. The inverting input of the third operational transconductance amplifier OTA3 is grounded. The output of the third operational transconductance amplifier OTA3 is electrically connected to the first terminal of the second capacitor C2 and the first terminal of the switch S1. The second terminal of the second capacitor C2 is electrically connected to the first terminal of the fifth resistor R5. The second terminal of the fifth resistor R5 is grounded. The second terminal of the switch S1 is electrically connected to the second terminal of the fifth resistor R5. The second terminal of the fourth resistor R4 is electrically connected to the second terminal of the second capacitor C2. The second terminal of the second capacitor C2 is electrically connected to the input of the RC low-pass filter.

7. The debugging circuit for controllable low-power display of a mobile phone screen according to claim 6, characterized in that: The signal conversion module includes an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC). The input of the ADC is electrically connected to the output of an RC low-pass filter. The output of the ADC is electrically connected to the input of the DAC. The output of the DAC is electrically connected to the input of a buffer amplifier. The input of the buffer amplifier is electrically connected to a display screen.

8. The debugging circuit for controllable low-power display of a mobile phone screen according to claim 7, characterized in that: The buffer amplifier includes amplifier OPA1. The non-inverting input of amplifier OPA1 is connected to the output of the digital-to-analog converter. The inverting input of 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 of amplifier OPA1 is connected to the base of transistor Q1. The collector of transistor Q1 is connected to a high level. The emitter of 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. The second terminal of the eighth resistor R8 is grounded.

9. A method, characterized in that, The method is applied to the debugging circuit of the controllable low-power display for mobile phone screens as described in any one of claims 1-8.

Images