LCD Projector Light Valve with Blue-Light Reflection Film
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Solution Overview
Problem
The high heat productivity and radiating difficulty of LCD light valves in projectors lead to poor user experience, durability issues, and non-uniform brightness and color cast in projected images.
Innovation Solution
A heat reflection light valve is introduced with a reflection film on the upper glass substrate that reflects blue light away from regions corresponding to the blue filter matrix, reducing heat absorption in the red and green filter matrices and the black matrix, thereby lowering overall heat productivity and enhancing durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a CF (Color Filter) with red, green and blue filter matrices is used in the light valve, then full color display capability is achieved, but heat productivity increases because each filter blocks other colors through absorption converting energy to joule heat
Solution Approach 1:
The invention converts the harmful blue light that causes heating in the red and green filter matrices into a beneficial resource by reflecting it onto a yellow phosphor layer, which converts the blue light into green light. This transforms the waste heat energy into useful illumination, improving overall light utilization efficiency while reducing heat accumulation in the filter matrices.
Solution Approach 2:
A yellow phosphor layer is introduced as an intermediary between the blue filter matrix and the red/green filter matrices. This phosphor layer absorbs blue light and converts it to green light, acting as a mediator that prevents direct heating of the red and green filters while still providing the necessary green component for full color display.
2Object-affected harmful factors
If a black matrix made of carbon black polypropylene resin material is used to eliminate chromium metal, then environmental protection is improved and light absorption is enhanced, but heat productivity increases because the material absorbs nearly 100% of rays
Solution Approach 1:
The invention applies different optical properties to different regions: the blue filter matrix region has high blue light transmission, while the red and green filter matrix regions have blue light reflected onto them. The black matrix in the red and green regions receives reflected blue light from the yellow phosphor layer, converting it to green light, thereby reducing heat accumulation locally in these regions.
3Ease of operation
If illuminating rays enter from the upper glass substrate and pass through the liquid crystal box and TFT matrix, then the LCD light valve functions correctly, but heat accumulates in the upper glass substrate and filter matrices causing durability issues
Solution Approach 1:
Instead of allowing blue light to pass directly through to the red and green filters (causing heating), the invention inverts the light path by reflecting blue light onto the yellow phosphor layer, which then emits green light that passes through the red and green filters. This reverses the traditional light transmission path to reduce heat accumulation.
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 significantly reduces heat radiating burden, improves brightness uniformity, and minimizes color cast, resulting in enhanced user experience and projector performance.
Implementation Method 1
a layer of reflection film for reflecting blue light is produced on the inner surface of the upper glass substrate
Implementation Method 2
Each primary color of filter must block other colors in illuminating rays to pass, and the blocking adopts an absorption manner generally. The absorbed energy is converted into joule heat
Data Source
AI summary
The present invention discloses a heat reflection light valve of an LCD (Liquid Crystal Display) projector and a projector. The heat reflection light valve comprises an upper glass substrate, a lower glass substrate and a liquid crystal box clamped between the upper glass substrate and the lower glass substrate, and a TFT (Thin Film Transistor) array is produced on the lower glass substrate; and a CF (Color Filter), a BM (Black Matrix), an OC (Over Coater), a transparent electrode and a post spacer are produced on the upper glass substrate. A layer of reflection film for reflecting blue light is produced on the inner surface of the upper glass substrate, and the reflection film is not produced in a region corresponding to a blue filter matrix of the CF.