Automatic flicker adjusting device of total reflection liquid crystal display

Abstract

The invention discloses an automatic flicker adjusting device for a total reflection liquid crystal display. A bracket is provided with a multidirectional knob and an adsorption base to realize size adaptation of the display; the signal connection system comprises a high-speed serial bus interface board, the input end of the high-speed serial bus interface board is connected with an external control mainboard to receive a control signal, and the output end of the high-speed serial bus interface board is divided into two paths: the first path drives the light source unit of the front light panel module, and the second path transmits a brightness data signal; the detection and control system comprises an optical sensor and a main control unit, the optical sensor collects brightness data of the display, and the main control unit executes frequency domain analysis on a brightness signal to calculate a flicker rate and dynamically adjust a driving voltage parameter of the display; and feeding back an iterative adjustment parameter based on the optical sensor through a closed-loop feedback mechanism until the flicker rate meets a target range, and finally writing an optimization parameter into a nonvolatile memory of a display controller. While the visual display stability and the long-term reliability are improved, the collaborative optimization of the production line calibration efficiency and the system adaptive ability is achieved.

Description

Technical Field

[0001] This invention relates to the field of display device testing, and more particularly to an automatic flicker adjustment device for a total internal reflection liquid crystal display. Background Technology

[0002] Traditional total internal reflection liquid crystal displays (LCDs) suffer from systemic defects in flicker suppression: poor mechanical support adaptability leads to unstable display positioning, affecting test accuracy; the voltage regulation mechanism has a sluggish response and lacks closed-loop feedback, making it difficult to dynamically correct driving parameters; electromagnetic interference easily causes optical signal transmission distortion, affecting the accuracy of frequency domain analysis; single-objective optimization strategies cannot simultaneously address flicker suppression and power consumption control, resulting in an energy efficiency imbalance; the charge accumulation problem caused by the liquid crystal molecule orientation hysteresis effect has not been effectively solved for a long time, leading to visual flicker and decreased display stability; in addition, existing devices lack wide color gamut coverage and vibration-resistant design, resulting in low calibration efficiency in complex production line environments. Summary of the Invention

[0003] This invention proposes an automatic flicker adjustment device for a total internal reflection liquid crystal display, comprising: The front light panel module, which includes a light source unit and a light guide plate assembly, is fixed to the test platform by a three-dimensional adjustable mechanical bracket. The bracket is equipped with a multi-directional knob and a magnetic base to achieve display size adaptation. The signal connection system includes a high-speed serial bus interface board. Its input end is connected to an external control motherboard to receive control signals, and its output end is divided into two paths: the first path drives the light source unit of the front light panel module, and the second path transmits brightness data signals. The detection and control system includes an optical sensor and a main control unit. The optical sensor collects brightness data of the display, and the main control unit performs frequency domain analysis on the brightness signal to calculate the flicker rate. It dynamically adjusts the driving voltage parameters of the display and iteratively adjusts the parameters based on feedback from the optical sensor through a closed-loop feedback mechanism until the flicker rate meets the target range. Finally, the optimized parameters are written into the non-volatile memory of the display controller.

[0004] The light guide plate assembly has a high reflectivity film on its edge, and the light source unit integrates a dual-channel driving circuit to achieve color temperature adjustment; the mechanical support is equipped with a three-axis precision displacement mechanism and a negative pressure adsorption unit.

[0005] The high-speed serial bus interface board receives control signals through an ultra-thin flexible circuit; the optical sensor is connected to the high-speed serial bus interface board by a double-layer electromagnetic shielded cable, and the shielding layer includes a metal braided mesh and a ring-shaped magnetic core assembly.

[0006] The main control unit consists of a signal processing module, a register control module, and an optimization algorithm module. The signal processing module performs spectral conversion of the luminance signal, the register control module dynamically adjusts the value of the drive voltage parameter register, and the optimization algorithm module generates parameter optimization instructions through iterative calculation.

[0007] The closed-loop feedback mechanism injects a reverse compensation voltage into the data line during the vertical blanking period of the display to balance the voltage drift of the liquid crystal capacitor; the main control unit writes parameters into the non-volatile memory through a dedicated debugging interface.

[0008] The frequency domain analysis employs Fast Fourier Transform to decompose the fundamental frequency and harmonic components; the optimization algorithm module runs a multi-objective decision algorithm to coordinate the flicker rate and system power consumption.

[0009] The target range is determined by a preset threshold matrix; the register control module uses a dynamic stepping mechanism to adjust the driving voltage parameters, and the step direction and amplitude are dynamically corrected based on real-time feedback from the optical sensor.

[0010] The optimization algorithm module employs an interval convergence algorithm to optimize parameters; the voltage adjustment step size of the register control module decays exponentially with the number of iterations; and the optimization algorithm module verifies the flicker rate change trend to avoid local convergence.

[0011] The reverse compensation voltage is generated by a high-precision digital-to-analog converter unit, and its polarity is opposite to that of the data line voltage. The main control unit integrates a timing control module to ensure that the compensation voltage is synchronously applied during the vertical blanking period.

[0012] The Fast Fourier Transform is executed by a dedicated spectrum processor called by the main control unit; the multi-objective decision algorithm adopts a Pareto optimal solution selection strategy, and the weight coefficients are dynamically updated based on feedback from the power consumption sensor.

[0013] This invention integrates negative pressure adsorption and precision displacement mechanisms into a three-dimensional adjustable mechanical support to achieve wide-size adaptation and vibration-resistant stable positioning of the display. Based on high-frequency sampling and spectral decomposition technology using optical sensors, it accurately captures periodic flicker characteristics and combines a dynamic closed-loop feedback mechanism to correct the driving voltage waveform parameters in real time, significantly suppressing light source fluctuations. A reverse compensation voltage injection design during the vertical blanking period is introduced to effectively neutralize residual charge drift in the liquid crystal layer and eliminate hysteresis effects. A multi-objective decision-making algorithm is used to coordinate the conflict between flicker rate and power consumption, achieving energy efficiency balance through a Pareto optimal solution selection strategy and adaptive weight updates. The signal transmission system employs a double-layer electromagnetic shielding structure to ensure the integrity of brightness data. Ultimately, while improving visual display stability and long-term reliability, it achieves synergistic optimization of production line calibration efficiency and system adaptability. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the system structure of an automatic flicker adjustment device for a total internal reflection liquid crystal display proposed in this invention. Detailed Implementation

[0015] refer to Figure 1 This invention proposes an automatic flicker adjustment device for a total reflection liquid crystal display, comprising: a front light plate module 3, a signal connection system 1, and a detection and control system 6.

[0016] The front light panel module 3 is fixed on the test platform 5 by a three-dimensional adjustable mechanical bracket 4. The multi-directional knob and adsorption base of the bracket 4 are adapted to the size of the display 7. The high-speed serial bus interface board 11 of the signal connection system 1 outputs control signals, which drive the light source unit 31 and transmit brightness data. After the optical sensor 61 of the detection and control system 6 collects the brightness data, the main control unit 62 performs frequency domain analysis to calculate the flicker rate, dynamically adjusts the driving voltage parameters through a closed-loop feedback mechanism, and finally writes the optimized parameters into the memory.

[0017] Understandably, the three-dimensional adjustable mechanical support 4 adapts to the positioning requirements of displays 7 of different sizes through a multi-degree-of-freedom adjustment mechanism, the optical sensor 61 captures brightness fluctuation characteristics in real time, the main control unit 62 identifies the periodic light intensity change pattern through a signal conversion algorithm, and the closed-loop feedback mechanism continuously corrects the driving voltage waveform parameters based on the analysis results, thereby suppressing light source fluctuations.

[0018] In this exemplary embodiment, the overall structure of the device operates based on the principle of optical sensing and dynamic feedback. The optical sensor 61 captures the brightness signal through high-frequency sampling, the main control unit 62 uses spectrum decomposition technology to separate the fundamental frequency and harmonic components, the closed-loop feedback mechanism adaptively adjusts the driving voltage waveform according to the analysis results, and the parameters are persisted by writing to non-volatile memory.

[0019] In the specific implementation phase, technicians first fix the display 7 to the three-dimensional adjustable mechanical bracket 4, adjust the multi-directional knob to complete the size adaptation, and then start the detection and control system 6. The optical sensor 61 continuously collects brightness data and transmits it to the main control unit 62 through the high-speed serial bus interface board 11. The main control unit 62 performs frequency domain analysis and processing, decomposes the fundamental frequency and harmonic components, and the closed-loop feedback mechanism dynamically corrects the value of the drive voltage register based on the calculation results. Finally, the optimized parameters are written into the non-volatile memory to complete the voltage regulation closed loop, thereby solving the problem of insufficient adjustment accuracy of traditional devices and effectively suppressing the flicker rate of the display 7, improving the visual display stability and long-term reliability.

[0020] The light guide plate assembly 32 is specifically an optical device that converts a point light source into a uniform surface light source to optimize light distribution efficiency. The memory specifically includes an electrically erasable programmable memory chip for permanently storing voltage parameter configurations.

[0021] Furthermore, a high-reflectivity film is provided on the edge of the light guide plate assembly 32, the dual-channel drive circuit of the light source unit 31 achieves color temperature adjustment through independent current control, and the three-axis precision displacement mechanism of the mechanical bracket 4, together with the negative pressure adsorption unit, ensures the positioning accuracy of the display 7.

[0022] In this exemplary embodiment, the high reflectivity film can significantly improve the efficiency of side-incident light, the dual-channel drive mixes white light of different color temperatures through pulse width modulation technology, and the negative pressure adsorption unit generates a stable fixing force through air pressure difference.

[0023] Among them, the dual-channel drive circuit achieves continuous color temperature switching by independently adjusting the current ratio of cold / warm light sources, the three-axis displacement mechanism provides micron-level positioning accuracy, and the negative pressure adsorption unit eliminates displacement deviation caused by external vibration, thereby solving the problem of poor adaptability of traditional bracket 4, so as to achieve wide color gamut coverage and anti-displacement stability.

[0024] Those skilled in the art will understand that this module achieves light efficiency optimization through thin-film reflection and dual-channel current control. The high-reflectivity thin film enhances the utilization rate of side light, and the dual-channel drive circuit uses pulse width modulation to mix the cold / warm white light spectrum. The three-axis precision displacement mechanism, combined with negative pressure adsorption, ensures that the display 7 is stably positioned in a micro-vibration environment.

[0025] In a further specific implementation: when technicians install the light guide plate assembly 32, they attach the high reflectivity film to the edge to maximize light capture efficiency. When configuring the dual-channel drive circuit, they set the ratio of cool / warm white light through an independent current controller, mix the color temperature using pulse width modulation technology, operate the three-axis precision displacement mechanism to adjust the position of the display 7, and simultaneously activate the negative pressure adsorption unit to generate adsorption force, ensuring no displacement drift during the test, thereby solving the problems of light leakage and unstable positioning, achieving wide color gamut coverage and vibration resistance, and improving the adaptability to the test environment.

[0026] The dual-channel drive circuit is specifically an electronic module that independently adjusts the current of the two light sources to achieve continuously adjustable color temperature.

[0027] The high-speed serial bus interface board 11 receives control signals through an ultra-thin flexible circuit, and the optical sensor 61 is connected to the interface board 11 by a double-layer electromagnetic shielded cable containing a metal braided mesh and a ring magnetic core assembly.

[0028] In practice, the metal braided mesh achieves full electromagnetic coverage, the magnetic core assembly suppresses high-frequency switching noise, and the flexible circuit adopts a double-sided copper-clad structure to reduce signal transmission loss.

[0029] Understandably, the signal transmission system uses a double-layer shielding design to resist interference, a metal braided mesh to provide full-range electromagnetic protection, a ring-shaped magnetic core assembly to absorb broadband noise, and a flexible circuit with double-sided copper cladding to minimize signal impedance and ensure the integrity of brightness data transmission.

[0030] During the research and development process, technicians selected a double-layer cable containing a metal braided mesh and a ring-shaped magnetic core assembly to connect the optical sensor 61 and the interface board 11. The metal braided mesh covers the surface of the cable to achieve electromagnetic shielding, and the ring-shaped magnetic core assembly is sleeved on the key nodes of the cable to absorb high-frequency interference. The high-speed serial bus interface board 11 receives control signals through an ultra-thin flexible circuit. The double-sided copper-clad design reduces transmission loss. After the system starts up, the signal quality is monitored in real time, and the shielding configuration is adjusted to cope with environmental noise, thereby solving the signal distortion problem caused by electromagnetic interference, which greatly improves the accuracy of brightness data acquisition and promotes the reliability of test results.

[0031] Furthermore, the ring-shaped magnetic core assembly is specifically a ring-shaped structure made of ferrite material, used to absorb electromagnetic interference noise.

[0032] The main control unit 62 consists of a signal processing module, a register control module, and an optimization algorithm module. The signal processing module performs spectrum conversion to decompose the fundamental frequency and harmonics, the register control module dynamically adjusts the value of the drive voltage register, and the optimization algorithm module generates instructions through iterative calculation.

[0033] Understandably, the signal processing module converts the time-domain light intensity signal into a frequency-domain energy distribution, the optimization algorithm module generates the voltage regulation amount based on the objective function, and the register control module gradually approaches the optimal parameter value according to the attenuation strategy.

[0034] In summary, the main control unit 62 operates based on the principles of spectrum analysis and iterative optimization. The signal processing module converts the brightness signal into frequency domain components, the optimization algorithm module solves for the flicker minimization target, and the register control module implements a nonlinear attenuation strategy to update the voltage value.

[0035] In the specific implementation phase, the technicians configured the signal processing module to perform spectral feature extraction on the brightness sequence input by the optical sensor 61, identify the fundamental and harmonic energy distribution, and the optimization algorithm module aimed to minimize the flicker energy by running an iterative algorithm to generate voltage correction instructions. After receiving the instructions, the register control module adjusted the value of the drive voltage register according to the nonlinear attenuation rule, gradually approaching the optimal parameters and ensuring process stability.

[0036] It can solve the problem of hysteresis in voltage regulation response, thereby significantly optimizing flicker suppression efficiency and improving the system's adaptive capability.

[0037] Furthermore, the signal processing module is specifically a hardware unit for processing optical signals and is used to perform frequency domain conversion analysis.

[0038] The closed-loop feedback mechanism injects a reverse compensation voltage into the data line during the vertical blanking period. The high-precision digital-to-analog converter generates a voltage with opposite polarity, and the timing control module ensures synchronous loading.

[0039] During the research and development verification, the compensation voltage is generated by a high-precision conversion unit, the amplitude is set proportionally, and the voltage injection operation is completed within the vertical blanking period.

[0040] Furthermore, the digital-to-analog conversion unit generates a compensation signal with the opposite polarity to the pixel voltage. The timing control module precisely matches the blanking period of the display 7, and cancels the residual voltage drift of the liquid crystal layer through the charge neutralization effect, thereby solving the charge accumulation problem caused by frame refresh and significantly improving the stability of pixel voltage.

[0041] Those skilled in the art will understand that this mechanism utilizes the injection of reverse charge during the vertical blanking period, the generation of compensation voltage by the high-precision digital-to-analog converter, and the synchronous loading operation by the timing control module to achieve dynamic neutralization of the voltage drift of the liquid crystal capacitor.

[0042] During the research and development process, the technicians set the timing control module to match the vertical blanking period of the display 7. The high-precision digital-to-analog conversion unit generates a reverse compensation voltage during the blanking period. The compensation voltage amplitude is injected into the data line after being configured proportionally. The residual voltage of the liquid crystal layer is offset by charge neutralization. The whole process is completed synchronously during the blanking period to ensure that the pixel voltage is stable and drift-free, thereby solving the visual flicker problem caused by the accumulation of charge during frame refresh. This improves the overall stability of the pixel voltage and eliminates the display hysteresis effect.

[0043] Specifically, the vertical blanking period is the non-display period in the 7-refresh cycle of the display, used to perform compensation operations.

[0044] The optimization algorithm module runs a multi-objective decision-making algorithm to coordinate flicker rate and power consumption, adopts a Pareto optimal solution selection strategy, and the weight coefficients are dynamically updated based on feedback from the power consumption sensor.

[0045] In this exemplary embodiment, the algorithm constructs a comprehensive objective function that includes flicker rate and power consumption, filters non-dominated solution sets through constraints, and adaptively adjusts weight parameters according to temperature conditions.

[0046] Specifically, the Pareto optimal solution selection strategy is a decision-making method for selecting the optimal balance point when multiple objectives conflict.

[0047] Understandably, the optimization strategy achieves resource trade-offs through multi-objective decision-making, the Pareto optimal solution selection strategy evaluates the conflict between flicker rate and power consumption, and the weight coefficients are dynamically adjusted based on sensor feedback to ensure that the solution set is optimal under constraints.

[0048] In the specific implementation phase, technicians configure the optimization algorithm module to run the multi-objective decision algorithm. The power consumption sensor provides real-time feedback data. The algorithm constructs a comprehensive objective function and applies a Pareto optimal solution screening strategy. During the iteration process, the weight coefficients are adaptively updated according to temperature changes. Non-dominated solution sets are screened through constraints, and the optimal voltage parameters are output, thereby solving the energy efficiency imbalance problem caused by single-objective optimization. This enables flicker suppression and power consumption control to be optimized in synergy, promoting the improvement of the system's energy efficiency ratio.

[0049] Specifically, the multi-objective decision-making algorithm is a computational method for coordinating conflicting objectives, used to select the Pareto optimal solution.

[0050] In summary, this solution achieves wide-size adaptation of the display 7 through a three-dimensional bracket 4, reduces flicker rate to an imperceptible range for the human eye through spectral analysis combined with dynamic voltage adjustment, and eliminates liquid crystal response hysteresis through a closed-loop compensation mechanism. Laboratory verification shows that the system can complete parameter self-optimization within a reasonable timeframe, maintaining a low power consumption increase, making it suitable for calibration scenarios in total internal reflection liquid crystal production lines.

[0051] Those skilled in the art will understand that the negative pressure adsorption design of the three-dimensional adjustable support 4 ensures the mechanical stability of the test platform, the frequency domain analysis algorithm accurately captures the periodic flicker characteristics, and the synergistic effect of dynamic voltage adjustment and reverse compensation effectively neutralizes the liquid crystal molecule orientation hysteresis effect, thereby achieving unified optimization of flicker suppression and energy efficiency control in complex production line environments.

[0052] In this exemplary embodiment, the three-dimensional support 4 provides wide size adaptability, spectral analysis and dynamic adjustment reduce scintillation rate, closed-loop compensation cancels hysteresis, and the whole achieves efficient self-optimization.

[0053] During the R&D and verification process, after the technicians deployed the system, the three-dimensional bracket 4 quickly adapted to different display sizes 7. The optical sensor 61 and the main control unit 62 worked together to perform frequency domain analysis. The dynamic voltage adjustment and compensation mechanism injected reverse voltage during the blanking period. The multi-objective optimization strategy coordinated flicker and power consumption. The parameter self-optimization was completed in a reasonable time, and the power consumption increase was kept at a low level. This solved the problem of low calibration efficiency in traditional production lines, so that the flicker suppression rate of the display 7 reached a level imperceptible to the human eye, thereby improving the calibration accuracy and speed of the production line.

[0054] The above are merely preferred embodiments 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. An automatic flicker adjustment device for a total internal reflection liquid crystal display, characterized in that, include: The front light panel module (3) includes a light source unit (31) and a light guide plate assembly (32), which is fixed to the test platform (5) by a three-dimensional adjustable mechanical bracket (4). The bracket (4) is equipped with a multi-directional knob and an adsorption base to achieve size adaptation of the display (7). The signal connection system (1) includes a high-speed serial bus interface board (11), whose input end is connected to an external control motherboard (2) to receive control signals, and whose output end is divided into two paths: the first path drives the light source unit (31) of the front light board module (3), and the second path transmits brightness data signals; The detection and control system (6) includes an optical sensor (61) and a main control unit (62). The optical sensor (61) collects brightness data of the display (7). The main control unit (62) performs frequency domain analysis on the brightness signal to calculate the flicker rate, dynamically adjusts the driving voltage parameters of the display (7), and iteratively adjusts the parameters based on feedback from the optical sensor (61) through a closed-loop feedback mechanism until the flicker rate meets the target range. Finally, the optimized parameters are written into the non-volatile memory of the display (7) controller.

2. The automatic flicker adjustment device for a total internal reflection liquid crystal display as described in claim 1, characterized in that, The light guide plate assembly (32) has a high reflectivity film on its edge, and the light source unit (31) integrates a dual-channel driving circuit to achieve color temperature adjustment; the mechanical support (4) is equipped with a three-axis precision displacement mechanism and a negative pressure adsorption unit.

3. The automatic flicker adjustment device for a total internal reflection liquid crystal display as described in claim 1, characterized in that, The high-speed serial bus interface board (11) receives control signals through an ultra-thin flexible circuit; the optical sensor (61) and the high-speed serial bus interface board (11) are connected by a double-layer electromagnetic shielded cable, and the shielding layer includes a metal braided mesh and a ring-shaped magnetic core assembly.

4. The automatic flicker adjustment device for a total internal reflection liquid crystal display as described in claim 1, characterized in that, The main control unit (62) consists of a signal processing module, a register control module, and an optimization algorithm module. The signal processing module performs spectrum conversion of the brightness signal, the register control module dynamically adjusts the value of the drive voltage parameter register, and the optimization algorithm module generates parameter optimization instructions through iterative calculation.

5. The automatic flicker adjustment device for a total internal reflection liquid crystal display as described in claim 1, characterized in that, The closed-loop feedback mechanism injects a reverse compensation voltage into the data line during the vertical blanking period of the display (7) to balance the voltage drift of the liquid crystal capacitor; the main control unit (62) writes the parameters into the non-volatile memory through a dedicated debugging interface.

6. The automatic flicker adjustment device for a total internal reflection liquid crystal display as described in claim 1, characterized in that, The frequency domain analysis uses Fast Fourier Transform to decompose the fundamental frequency and harmonic components; the optimization algorithm module runs a multi-objective decision algorithm to coordinate the flicker rate and system power consumption.

7. The automatic flicker adjustment device for a total internal reflection liquid crystal display as described in claim 1, characterized in that, The target range is determined by a preset threshold matrix; the register control module uses a dynamic stepping mechanism to adjust the driving voltage parameters, and the step direction and amplitude are dynamically corrected based on real-time feedback from the optical sensor (61).

8. The automatic flicker adjustment device for a total internal reflection liquid crystal display as described in claim 4, wherein the optimization algorithm module uses an interval convergence algorithm to perform parameter optimization; the voltage adjustment step size of the register control module decreases exponentially with the number of iterations; and the optimization algorithm module verifies the flicker rate change trend to avoid local convergence.

9. The automatic flicker adjustment device for a total reflection liquid crystal display as described in claim 5, wherein the reverse compensation voltage is generated by a high-precision digital-to-analog converter unit and its polarity is opposite to that of the data line voltage; the main control unit (62) integrates a timing control module to ensure that the compensation voltage is synchronously loaded during the vertical blanking period.

10. The automatic flicker adjustment device for a total reflection liquid crystal display as described in claim 6, wherein the fast Fourier transform is executed by a dedicated spectrum processor called by the main control unit (62); the multi-objective decision algorithm adopts a Pareto optimal solution screening strategy, and the weight coefficients are dynamically updated based on feedback from the power consumption sensor.

Images