Display Device Color Balance Stabilization via Illuminance Feedback
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Solution Overview
Problem
Display devices using liquid crystals or organic EL struggle to maintain color balance and brightness over time, particularly when back light intensity changes, leading to color unevenness and inability to brighten colors even with maximum transmittance.
Innovation Solution
A display device with light-emitting elements of different colors, equipped with a change amount acquisition unit to measure illuminance changes and a calculation unit to adjust drive power, ensuring consistent light emission and maintaining color balance by compensating for brightness decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transmittance of liquid crystal cell is increased to brighten color, then brightness control is improved, but when backlight darkens, color cannot be brightened even at 100% transmittance
Solution Approach 1:
The patent implements a feedback mechanism where the illuminance sensor continuously monitors the actual brightness of each color (R, G, B) emitted by the display. The controller receives this feedback and dynamically adjusts the backlight intensity and liquid crystal cell transmittance to compensate for deviations from the target color balance, ensuring stable color reproduction even as components age or environmental conditions change.
Solution Approach 2:
The system performs self-adjustment by automatically detecting color balance deviations through the illuminance sensor and correcting them without external intervention. The controller autonomously modifies drive signals to the liquid crystal cells and backlight intensity based on real-time measurements, enabling the display to maintain optimal color balance independently.
2Use of energy by moving object
If backlight intensity is reduced to save energy, then power consumption is decreased, but color balance collapses due to inability to compensate for brightness changes
Solution Approach 1:
The patent employs dynamic adjustment of multiple parameters including backlight intensity, liquid crystal cell transmittance, and individual color channel drive signals. The controller continuously optimizes these dynamic parameters based on real-time illuminance measurements to maintain color balance while adapting to varying power consumption requirements and environmental conditions.
Solution Approach 2:
The system changes multiple operating parameters simultaneously - backlight intensity, liquid crystal cell voltage (affecting transmittance), and individual RGB channel drive signals - to achieve color balance compensation. By adjusting these parameters in coordination, the system can reduce overall power consumption while maintaining stable color output through intelligent parameter optimization.
3Stability of the object's composition
If liquid crystal cell transmittance is used to control color brightness, then color balance adjustment is achieved, but suppresses maximum brightness potential when backlight darkens
Solution Approach 1:
The patent performs preliminary measurement of the backlight's actual illuminance characteristics using the integrator and illuminance sensor before full display operation. This preliminary data is stored and used as a reference to pre-calculate compensation factors for liquid crystal cell transmittance and color drive signals, enabling the system to maintain maximum brightness potential while accounting for backlight variations from the outset.
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 effectively suppresses color changes and maintains brightness across light-emitting elements, ensuring stable color balance and improved display quality even as usage time increases.
Implementation Method 1
a display unit at which a plurality of light-emitting elements having different luminescent colors are arranged, illuminance of the light-emitting element varying in accordance with supplied power
Implementation Method 2
a sensor unit including an illuminance sensor 190. The illuminance sensor 190 detects illuminance of light emitted by the light-emitting element 130
Data Source
AI summary
A change amount of illuminance of a luminescent color by a light-emitting element is acquired, and based on the change amount acquired for each luminescent color, drive power to be supplied to the light-emitting element of each luminescent color is calculated in order to reduce the change amount. In addition, light emission of each light-emitting element of each luminescent color is controlled with the calculated drive power to control display of the display unit.