Backlight Module with Mixed LED Types for Quantum Dot Display
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Solution Overview
Problem
Current backlight modules for large or curved liquid crystal displays face challenges in achieving uniform light distribution and preventing color cast due to invalid areas in quantum dot encapsulated tubes, leading to light leakage and color inaccuracies.
Innovation Solution
Incorporating a light bar with both monochromatic and white LED lights, where monochromatic LEDs correspond to valid areas and white LEDs correspond to invalid areas of quantum dot encapsulated tubes, ensuring that light emitted from the invalid areas does not contribute to the display, thereby preventing color cast and achieving a wide color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If quantum dot encapsulated tubes are used to achieve wide color gamut display, then color accuracy is improved, but invalid areas on end portions cause light leakage and color cast
Solution Approach 1:
The patent applies local quality by differentiating LED types based on their position relative to the quantum dot encapsulated tube. Monochromatic LED lights are used for valid areas where precise color control is needed, while white LED lights are used for invalid areas on end portions where color accuracy is less critical. This localized differentiation resolves the contradiction by matching LED characteristics to the functional requirements of different regions.
Solution Approach 2:
The light source is segmented into two distinct types: monochromatic LED lights for valid areas and white LED lights for invalid areas. This segmentation allows each type to perform its optimized function, with monochromatic LEDs providing color-accurate illumination for the quantum dot conversion area and white LEDs providing sufficient illumination for end portions without contributing to color cast.
2Measurement precision
If monochromatic LED lights are used for all positions, then color gamut is improved, but uniformity of light distribution deteriorates due to invalid areas
Solution Approach 1:
Different LED types are assigned to different locations: monochromatic LEDs for valid areas requiring color accuracy, and white LEDs for invalid areas where uniformity is prioritized. This local differentiation ensures that each region receives the appropriate type of illumination, resolving the contradiction between color gamut and uniformity.
3Illumination intensity
If white LED lights are used for all positions, then uniformity of light distribution is improved, but color accuracy deteriorates
Solution Approach 1:
The patent assigns white LED lights specifically to invalid areas on end portions where uniformity is important but color accuracy is less critical, while monochromatic LED lights are used for valid areas where color accuracy is paramount. This spatial differentiation resolves the contradiction by optimizing each location for its primary requirement.
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 configuration ensures uniform light emission with high purity, preventing color cast and dark regions on the liquid crystal display screen, allowing for a more accurate and aesthetically pleasing wide color gamut display.
Implementation Method 1
a quantum dot encapsulated tube and a light guide plate; where the light bar and the light guide plate are disposed at two opposing sides of the quantum dot encapsulated tube respectively... an LED light in the plurality of the LED lights which corresponds to a valid area of the quantum dot encapsulated tube is a monochromatic LED light
Implementation Method 2
both the light bar and the quantum dot encapsulated tube are located at a light incident surface side of the light guide plate... ensuring uniform light emission
Data Source
AI summary
A backlight module and a display apparatus are provided. The backlight module includes: a light bar, a quantum dot encapsulated tube and a light guide plate; the light bar and light guide plate are disposed at two sides of quantum dot encapsulated tube respectively, the light bar and quantum dot encapsulated tube are disposed in parallel, the light bar and quantum dot encapsulated tube are located at a light incident surface side of light guide plate, a plurality of LED lights are disposed on the light bar at a side facing towards the quantum dot encapsulated tube, an LED light corresponding to valid area of quantum dot encapsulated tube is monochromatic LED light, an LED light corresponding to invalid area of quantum dot encapsulated tube is white LED light, and invalid area of quantum dot encapsulated tube is within irradiation range of the white LED light.