Backlight Voltage Control for LCD Brightness Stability
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Solution Overview
Problem
The stability and brightness of liquid crystal display backlights are affected by unstable power source voltages and high environmental temperatures, leading to variations in current and brightness, which impact display quality.
Innovation Solution
A method and device that adjust the voltage input to light emitting devices in the backlight by detecting current or brightness levels, using a voltage control signal with adjustable duty cycles to maintain the current or brightness within preset ranges, thereby stabilizing the backlight's performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backlight uses a simple LED light source without active control, then the device complexity is low, but the brightness stability deteriorates under unstable power source voltages and high temperatures
Solution Approach 1:
The patent implements a feedback control mechanism where the detection unit continuously monitors the actual brightness or current of the light emitting devices, compares it with the standard value, and adjusts the voltage input accordingly. This closed-loop feedback system automatically compensates for brightness deviations caused by power source instability or high temperatures, thereby improving brightness stability without requiring complex manual intervention.
Solution Approach 2:
The control unit autonomously adjusts the voltage input to the light emitting devices based on detection results, eliminating the need for external manual control. The system self-corrects brightness deviations by automatically modifying operating parameters, which maintains reliability while keeping the control system relatively simple and integrated within the existing backlight structure.
2Reliability
If the system adjusts voltage frequently to maintain brightness, then the brightness stability improves, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The patent combines the detection unit and control unit into an integrated control system that works seamlessly with the existing LED backlight structure. By merging the monitoring and adjustment functions into a unified system that shares components and control pathways with the existing backlight circuitry, the patent reduces overall device complexity while maintaining consistent brightness through active voltage adjustment.
3Manufacturing precision
If the system monitors multiple parameters continuously, then the brightness control precision improves, but the loss of energy increases due to continuous monitoring and adjustment
Solution Approach 1:
The detection unit and control unit operate in periodic cycles rather than continuous monitoring. The system periodically detects brightness or current parameters, processes the data, and adjusts voltage when deviations are detected. This periodic operation reduces energy consumption compared to continuous monitoring while maintaining sufficient brightness control precision through timely adjustments.
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
This approach ensures stable backlight brightness across different environments and usage scenarios, improving the display quality of liquid crystal displays by maintaining current and brightness within rated ranges, even under conditions of unstable power or high temperatures.
Implementation Method 1
Currently, a LED (Light Emitting Diode) is generally used as the backlight of the liquid crystal display
Data Source
AI summary
A method for adjusting a backlight and a device for adjusting a backlight are provided. A parameter may be set as one of detectable physical quantities of the backlight. The physical quantity, for example, may be a current through a light emitting device, brightness of the light emitting device, or the like. An average value of the parameter is obtained according to values of the parameter which are detected in real time. When the average value is beyond a preset parameter range, a value of the voltage which is input to the light emitting device is adjusted, so that the current through the light emitting device is adjusted, and brightness of the backlight is adjusted. Thereby, brightness of the backlight can be adjusted in different ways, so that brightness of the backlight can be stable in different environments.