LED Backlight Control Using Cathode-Voltage Feedback
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Solution Overview
Problem
Extended reality (XR) devices face high power consumption due to low screen-on time and high brightness requirements, leading to inefficient backlight control and stability issues.
Innovation Solution
A backlight control system that acquires the cathode voltage of the light source at illumination completion and adjusts the output voltage based on preset voltage and feedback information, balancing stability and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If low-frequency PWM dimming is used for brightness adjustment, then screen brightness and user experience are improved, but power consumption remains high due to low screen-on time
Solution Approach 1:
The patent implements a feedback mechanism by acquiring the cathode voltage of the light source at the timing of illumination completion and using this feedback information to adjust the output voltage of the power conversion unit. This closed-loop control enables precise voltage regulation that reduces power consumption while maintaining required brightness levels during the low screen-on time periods in XR devices
Solution Approach 2:
The patent dynamically adjusts the output voltage parameter of the power conversion unit based on the feedback from cathode voltage measurements. By changing the voltage parameter in response to actual light source conditions, the system optimizes power consumption while ensuring adequate brightness output during active display periods
2Illumination intensity
If high brightness is maintained for XR display requirements, then display quality is improved, but backlight stability deteriorates
Solution Approach 1:
The acquisition unit measures the cathode voltage at illumination completion timing, providing real-time feedback on the actual voltage delivered to the light source. The processing unit uses this feedback to adjust subsequent output voltage, creating a closed-loop control system that maintains consistent brightness output and improves backlight stability despite variations in operating conditions
Solution Approach 2:
The patent transitions from static voltage output to dynamic voltage adjustment by continuously monitoring cathode voltage and adapting the output voltage accordingly. This dynamic control approach allows the backlight system to maintain stability while accommodating the high brightness requirements of XR displays during active periods
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances system stability while reducing power consumption by optimizing backlight control using cathode voltage feedback.
Implementation Method 1
a power conversion unit, configured to convert an input electrical signal into an output voltage for driving a light source
Implementation Method 2
an output voltage for driving a light source
Data Source
AI summary
A backlight control system, a control method, and a related device are provided. The backlight control system includes: a power conversion unit, configured to convert an input electrical signal into an output voltage to drive a light source; an acquisition unit, configured to acquire a cathode voltage of the light source at a timing of a completion of light source illumination; and a processing unit, connected to the acquisition unit and configured to determine feedback information used to adjust the output voltage based on a preset voltage and the cathode voltage. The cathode voltage of the light source is acquired by the acquisition unit. The processing unit determines the feedback information used to adjust the output voltage based on the preset voltage and the cathode voltage. The feedback information is beneficial for balancing backlight stability and power consumption, thereby enhancing system stability while reducing power consumption of the system.