Backlight Temperature Correction for Rapid Color Convergence
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Solution Overview
Problem
Conventional liquid crystal display devices take a long time to converge to a set color temperature due to temperature drift in backlight devices, affecting the brightness and chromaticity of emitted light.
Innovation Solution
A backlight device with a light emitting unit of multiple color sources, a detection unit, a temperature sensor, and a calculation unit that performs temperature correction on detected light emission states to determine drive values for the light sources, using a relationship between temperature and correction values to adjust light emission amounts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional backlight control is used without temperature correction, then the device structure remains simple, but the color temperature convergence time is long and color reproduction accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-storing correction values in a correction value storage unit that correspond to different temperature ranges. When the temperature sensor detects the current temperature, the calculation unit immediately retrieves the appropriate correction value without requiring real-time computation or gradual adjustment, enabling instant compensation for temperature drift and achieving rapid color temperature convergence.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the temperature via the temperature sensor and using this information to dynamically adjust the drive values of the light sources. The calculation unit computes corrected drive values based on the detected temperature and stored correction values, creating a closed-loop system that automatically compensates for temperature-induced brightness changes and maintains accurate color temperature.
2Productivity
If temperature correction is implemented using stored correction values, then color temperature convergence speed improves, but the device complexity increases due to additional components
Solution Approach 1:
The patent reduces device complexity by using preliminary action - correction values are pre-calculated and stored in a lookup table during manufacturing. This eliminates the need for complex real-time computational algorithms or additional processing hardware, allowing rapid temperature compensation to be achieved through simple data retrieval and basic arithmetic operations.
Solution Approach 2:
The patent applies parameter changes by storing correction values that represent predetermined adjustments to drive currents based on temperature ranges. Instead of implementing complex control algorithms, the system simply changes the drive parameters using pre-determined correction values retrieved from storage, achieving fast convergence with minimal additional hardware complexity.
3Manufacturing precision
If temperature correction is performed for each light source color, then color reproduction accuracy improves, but the calculation complexity increases
Solution Approach 1:
The patent applies segmentation by separating the temperature correction process into independent color channels (red, green, blue). Each light source color has its own correction value stored in the correction value storage unit, allowing the calculation unit to process and adjust each color independently based on temperature detection, thereby maintaining precise chromaticity control with simplified calculations.
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
The solution reduces the time taken to converge to a set color temperature, ensuring precise control over brightness and chromaticity, regardless of the set color temperature, thereby improving the display's color reproduction range and stability.
Implementation Method 1
a temperature sensor that measures a temperature in a proximity of the plurality of light sources
Implementation Method 2
red (R), green (G), and blue (B) colors are mixed to emit white color light
Implementation Method 3
light emitting diode interior rises due to the heat generated by the light emitting diode itself
Implementation Method 4
the temperature of a connection unit in the light emitting diode interior rises due to the heat generated by the light emitting diode itself
Data Source
AI summary
A backlight device includes a plurality of light sources that emit light of different colors from each other, a plurality of color sensors that receive mixed-color light including light emitted from the light sources to detect light emission states of the light sources, a temperature sensor that measures a temperature in a proximity of the plurality of light sources, a brightness conversion unit that separates the mixed-color light to obtain a detection value for each of the light sources by converting values indicating the detected light emission states, and a calculation unit that corrects the obtained detection value by using information indicating a relationship between the measured temperature and a correction value, the calculation unit determining drive values for the light sources based on the corrected detection value.