Backlight Control Device for LCD Color and Response Speed Trade-off
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Solution Overview
Problem
Existing backlight technologies for liquid crystal display devices achieve high color rendering and low power consumption but compromise on response speed, requiring a trade-off between color reproducibility and speed.
Innovation Solution
A control device that manages the light emission of first and second light emitting devices with different color reproducibility and response speeds, adjusting their luminance relation based on usage to satisfy predetermined conditions for either color reproducibility or response speed emphasizing modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If single-chip white LEDs and multi-chip full-color LEDs are combined to achieve high color rendering and high color reproducibility, then color quality is improved, but response speed deteriorates
Solution Approach 1:
The backlight is divided into two independent light emitting devices: first light emitting devices (white LEDs) and second light emitting devices (full-color LEDs). Each device operates independently with different characteristics, allowing the system to leverage the high color reproducibility of white LEDs while utilizing the fast response speed of full-color LEDs for motion compensation, thereby resolving the contradiction between color quality and response speed.
Solution Approach 2:
The patent combines two types of LED devices with complementary characteristics into a single backlight system. The white LEDs provide the base illumination with excellent color reproducibility, while the full-color LEDs are added to specifically address response speed limitations. The control device merges their outputs through luminance adjustment to achieve both high color quality and fast response simultaneously.
2Use of energy by moving object
If white LEDs are used to achieve high luminance with low power consumption, then energy efficiency is improved, but response speed deteriorates
Solution Approach 1:
The backlight system segments the lighting function into two parts: white LEDs handle the primary illumination task with high energy efficiency, while full-color LEDs are specifically assigned the motion compensation function. This segmentation allows each component to operate in its optimal performance range, maintaining low power consumption while achieving fast response for moving images.
Solution Approach 2:
Instead of requiring the energy-efficient white LEDs to perform both high luminance output and fast response, the patent applies partial action by using full-color LEDs specifically for the response speed aspect. The full-color LEDs operate at lower luminance levels just sufficient for motion compensation, while white LEDs provide the bulk of the illumination, thus maintaining overall energy efficiency.
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 the achievement of vivid color reproduction or improved moving image quality by optimizing the luminance relationship between the light emitting devices, preventing blurring and ensuring uniform lighting.
Implementation Method 1
single-chip white light emitting diodes (LEDs) and multi-chip full-color LEDs
Implementation Method 2
light emitting diodes capable of achieving a high luminance with low power consumption
Data Source
AI summary
The present invention relates to a light emitting device and achieves either desirable color reproduction or improved image quality of a moving image according to the usage of an electronic device. The electronic device includes a first light emitting device and a second light emitting device having color reproducibility lower than that of the first light emitting device and having a response speed faster than that of the first light emitting device, and a control device includes a light emission control section configured to control light emission of the first light emitting device and light emission of the second light emitting device according to a usage of the electronic device such that a relation between luminance of the first light emitting device and luminance of the second light emitting device satisfies a predetermined condition.