Sequential Light Emission for Precise Color Balance Control
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Solution Overview
Problem
Existing image display devices face challenges in maintaining precise color balance and white balance due to changes in light sources over time, particularly in detecting the color of liquid crystal panels and adjusting the output of light-emitting elements effectively.
Innovation Solution
An image display device and method that include a first and second light-emitting element emitting different wavelength bands, a light quantity measurement unit with filters for each wavelength band, and a control unit that generates compensation information to adjust the light output of each element based on measured quantities, excluding interference from other wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color filters are used to detect light for each color, then color detection is enabled, but light of other colors is simultaneously detected due to wavelength characteristic of filters
Solution Approach 1:
The patent segments the detection process by time rather than by spatial separation of filters. The light-emitting elements emit light sequentially in time slots, allowing the single detector to measure each wavelength band independently without cross-contamination from other colors, thus resolving the filter wavelength characteristic problem
Solution Approach 2:
The system employs periodic sequential emission of different wavelength bands from light-emitting elements. Each element emits light in periodic time slots, enabling the detector to measure each color separately at different times, eliminating the simultaneous detection of multiple colors that plagues filter-based systems
2Illumination intensity
If multiple light-emitting elements emit light simultaneously, then high luminance is achieved, but precise control of each element's output becomes difficult
Solution Approach 1:
The patent uses periodic sequential emission where multiple light-emitting elements emit light in alternating time slots rather than simultaneously. This temporal separation allows independent measurement and control of each element's output while maintaining high overall luminance through coordinated emission sequences
Solution Approach 2:
The system maintains continuous useful action by having light-emitting elements emit light in rapid succession with no idle time between sequences. The sequential emission creates the perception of continuous high luminance while enabling precise individual control through time-separated measurement
3Illumination intensity
If light from multiple wavelengths is combined, then high luminance is achieved, but changes in light source over time cause color and white balance drift
Solution Approach 1:
The patent implements feedback control where a detector measures the actual light output of each wavelength band in real-time, and the control unit adjusts the drive signals to maintain target luminance values. This closed-loop system compensates for temporal changes in light source characteristics, preventing color and white balance drift while maintaining high luminance
Solution Approach 2:
The system dynamically changes operational parameters (drive signals) based on measured light output. By adjusting the intensity and timing of each light-emitting element's emission based on real-time feedback, the system maintains stable color balance and white balance despite temporal variations in light source performance
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
Enables high-precision adjustment of light-emitting element outputs, maintaining optimal color balance and white balance by accurately measuring and controlling the light quantities of each wavelength band, thus improving the image display quality.
Implementation Method 1
the light quantity measurement unit includes a first filter that takes the first wavelength band as its main detection wavelength band and a second filter that takes the second wavelength band as its main detection wavelength band
Data Source
AI summary
A light quantity measurement unit measures a quantity of light of a light source that has a first light-emitting element that emits light of a first wavelength band and a second light-emitting element that emits light of a second wavelength band. The light quantity measurement unit includes first and second filters having the first and second wavelength bands as the detection wavelength bands. The first and second light-emitting elements are caused to sequentially emit light, and on the basis of the results of measurement of the quantity of light that is measured by way of the first and second filters, a control unit generates first compensation information in which light of the second wavelength band is measured with the first filter and second compensation information in which light of the first wavelength band is measured with the second filter, finds a first compensation light quantity of the first light-emitting element by excluding the quantity of light based on the first compensation information from the quantity of light that is measured by way of the first filter, finds a second compensation light quantity of the second light-emitting element by excluding a quantity of light based on the second compensation information from the quantity of light measured by way of the second filter, and then controls the quantity of light of the first and second light-emitting elements based on the first and second compensation light quantities.