Display Device Voltage Compensation for Phosphor Aging
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Solution Overview
Problem
Conventional display devices experience chromatic aberration and color distortion due to phosphor aging over time, leading to changes in the RGB ratio of the light emitted by LEDs used as backlights in LCD panels.
Innovation Solution
A method and device that adjust the driving voltage of each pixel based on a compensation voltage determined by the cumulative lighting duration, using pre-stored relationships to mitigate chromatic aberration by adjusting the red, green, and blue channels' voltages accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the LED lighting time of the display device increases, then the display device can maintain continuous operation and provide stable illumination, but the phosphor ages leading to chromatic aberration and color distortion in the displayed image
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation voltage values in a lookup table during device initialization or calibration phase. The table maps cumulative lighting duration to corresponding compensation voltages for each color channel (R, G, B). When the display needs to compensate for phosphor aging, the system simply queries the pre-computed table rather than performing complex real-time calculations, enabling proactive compensation before significant color distortion occurs.
Solution Approach 2:
The patent implements feedback by continuously monitoring the cumulative lighting duration and using this information to dynamically adjust the driving voltage for each color channel. The system feeds back the aging effect (measured through lighting duration) and automatically compensates by applying voltage corrections retrieved from the lookup table, thereby maintaining color accuracy throughout the device's operational life.
2Use of energy by moving object
If the phosphor is excited by blue light for extended periods, then the LED can continuously produce white light for display, but the RGB ratio changes causing chromatic aberration
Solution Approach 1:
The patent applies dynamics by making the driving voltage adjustable and time-dependent. Instead of using a fixed voltage that causes phosphor degradation and RGB ratio changes, the system dynamically modifies the voltage applied to each color channel based on the cumulative lighting duration. The voltage for each channel is independently adjusted according to pre-determined compensation values, allowing the system to adapt to aging effects and maintain stable color composition throughout operation.
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 effectively reduces chromatic aberration and color distortion in displayed images by compensating for the aging effects on the phosphor, maintaining image quality over extended usage periods.
Implementation Method 1
the phosphor is excited by the blue light to generate a red light and a green light
Implementation Method 2
The backlight passes through a polarizing layer, a liquid crystal layer, a color film layer, etc., to display an image
Data Source
AI summary
A method for displaying an image includes: acquiring a current total lighting duration of a display device, the current total lighting duration being a current value of a cumulative lighting duration of the display device from a first time the device is lit up; determining a first compensation voltage corresponding to the current total lighting duration of the display device according to a pre-stored corresponding relationship between a total lighting duration and a compensation voltage, the compensation voltage including a compensation sub-voltage corresponding to each color channel of the display device; and adjusting a driving voltage of each pixel of the display device based on the first compensation voltage during display of the image by the display device.