LCD Backlight Mixing Plate With Light Control Film for Color Uniformity
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Solution Overview
Problem
LCD devices using LEDs as light sources face color non-uniformity issues due to variations in light intensities from red, green, and blue LEDs, leading to increased manufacturing complexity and costs when attempting to mitigate these issues through LED driver circuits or light guide plate adjustments.
Innovation Solution
A light source device with a mixing light guide plate and point light sources, including a light quantity control film to regulate light emission from LEDs with the highest intensity, reducing color non-uniformity by using a light-shielding, light-absorbing, or translucent film to adjust light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large number of LEDs emitting different wavelengths (red, green, blue) are used to obtain white illumination light, then the brightness and color quality are improved, but color non-uniformity occurs and device complexity increases
Solution Approach 1:
A light guide plate is introduced as an intermediary component between the LEDs and the display surface. This light guide plate performs two functions: it mixes the different colored lights (red, green, blue) to produce uniform white light, and it distributes the light uniformly across the entire display area. By using this intermediary light guide plate, the system achieves uniform white illumination without requiring complex LED driver circuits or precise LED arrangement, thus improving brightness while managing device complexity.
2Manufacturing precision
If LED driver circuits and light guide plate adjustments are used to mitigate color non-uniformity, then color uniformity is improved, but manufacturing complexity and costs increase
Solution Approach 1:
The light guide plate serves as a passive intermediary that optically mixes and distributes light from LEDs with varying intensities. Its internal structure (including scattering particles and refractive index variations) automatically performs the color mixing function without requiring active control systems. This approach achieves color uniformity through optical design rather than electronic control, significantly reducing manufacturing complexity and costs.
Solution Approach 2:
The light guide plate's optical parameters (refractive index, scattering characteristics, thickness) are optimized to achieve effective color mixing. By carefully controlling these physical parameters during manufacturing, the system achieves color uniformity through material properties rather than complex assembly or adjustment procedures, thereby reducing manufacturing complexity.
3Adaptability or versatility
If LEDs with varying light intensities are used, then the availability of different colors is improved, but color non-uniformity occurs in the illuminating surface
Solution Approach 1:
The light guide plate acts as an optical mixer that receives light from LEDs of different intensities and colors. Through internal scattering and refraction, it redistributes the light photons to achieve uniform color distribution across the display surface. This allows the system to use LEDs with varying intensities (improving color variety) while the light guide plate compensates for the non-uniformity, maintaining color uniformity without requiring precise LED matching.
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 reduces color non-uniformity in LCD devices by controlling light quantities from LEDs, simplifying the backlight structure and lowering manufacturing costs while maintaining efficient light distribution.
Implementation Method 1
an illuminating light guide plate 5 which emits the light which entered from the end surface 4A from the other principal plane 5B
Implementation Method 2
The illuminating plate 105 receives the light emitted from the mixing plate 104, and then emits the light from the entire plane thereof to illuminate the LCD panel 108
Implementation Method 3
The mixing light guide plate (hereinafter referred to as a mixing plate) 104 receives light emitted respectively from the LEDs 101 at one end thereof, mixes colors respectively of the light therein to generate white light
Implementation Method 4
The reflector 103 reflects light generated from the LEDs 101, and introduces the light into the mixing plate 104
Implementation Method 5
a light quantity control film arranged between the point light source and the entrance surface of the mixing light guide plate. A light quantity control film is arranged in a part which reduces the quantity of light from a point light source with the largest quantity of light
Data Source
AI summary
Color non-uniformity due to LED light sources of a liquid crystal display (LCD) device is improved. A light quantity control film is arranged between an LED source and the entrance surface of a mixing light guide plate. This light quantity control film is arranged in the part which reduces the quantity of light of the LED with the strongest light quantity among a plurality of same colors.