Backlight Device Light Transmitting Reflecting Plate Uniformity
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Solution Overview
Problem
Backlight devices for liquid crystal display (LCD) devices face challenges in reducing variations in color and brightness while maintaining a thin thickness, particularly when using light-emitting diodes (LEDs) or fluorescent lamps, as existing solutions require significant separation between the light source and diffusing plate to achieve uniform illumination, which increases device thickness and costs.
Innovation Solution
Incorporating a light transmitting reflecting means within the casing of the backlight device, which internally reflects and transmits light to a diffusing means, allowing for reduced separation between the light source and diffusing plate, thereby minimizing variations in color and brightness and enabling a thinner design without compromising light mixing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the separation between the light source and diffusing plate is increased to achieve uniform illumination, then color and brightness variations are reduced, but the device thickness increases
Solution Approach 1:
A light reflecting member is introduced as an intermediary component between the light source and the diffusing plate. This reflecting member redirects light from the light source to the diffusing plate, enabling effective light distribution over a shorter distance. The intermediary reflects light at specific angles to compensate for the reduced separation distance, maintaining uniform illumination without increasing device thickness.
2Length of stationary object
If the separation between the light source and diffusing plate is reduced to decrease device thickness, then color and brightness variations increase
Solution Approach 1:
The light reflecting member serves as a mediator that enables the system to operate with reduced separation distance while maintaining illumination uniformity. By strategically positioning the reflector between the light source and diffusing plate, light paths are extended effectively without increasing physical thickness, allowing the diffusing plate to be placed closer to the light source.
Solution Approach 2:
The light reflecting member utilizes angular reflection to redirect light in different directions, effectively adding a dimensional component to light distribution. Instead of relying solely on vertical separation distance, the system uses horizontal/angular light redirection to achieve uniform illumination, decoupling the relationship between thickness and illumination uniformity.
3Manufacturing precision
If multiple light sources are used to improve illumination uniformity, then color and brightness variations are reduced, but device complexity and cost increase
Solution Approach 1:
The light reflecting member acts as a single-component intermediary that performs the function previously requiring multiple light sources. By strategically positioning the reflector, a single light source can illuminate the diffusing plate uniformly, eliminating the need for multiple light sources and reducing device complexity while maintaining illumination quality.
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 approach effectively reduces variations in color and brightness, allows for a thinner backlight device, and decreases the number of light sources required, leading to cost savings while maintaining sufficient color mixing and light utilization efficiency.
Implementation Method 1
light transmitting reflecting means arranged in the casing for delimiting a space inclusive of the light source, with the light transmitting reflecting means transmitting a fraction of the incident light and reflecting another fraction of the incident light
Implementation Method 2
transmitting diffusing means arranged on the light radiating surface of the casing for diffusing the light transmitted through the light transmitting reflecting means and causing surface light radiation
Implementation Method 3
The casing has an inner surface as a reflecting surface for reflecting the incident light
Data Source
AI summary
A backlight device includes a light source (21) arranged in a casing (23) opened in a light radiating surface (20a), so that the light source faces the light radiating surface (20a) and radiates light towards the light radiating surface (20a), a light transmitting reflecting plate (25) arranged in the casing for delimiting a space inclusive of the light source (21) and adapted for transmitting a fraction of the incident light and for reflecting another fraction of the incident light, and a light transmitting diffusing plate (41) arranged on the light radiating surface (20a) of the casing (23) for diffusing the light transmitted through the light transmitting reflecting plate (25) and for causing surface light radiation. A light reflecting surface (24) is formed on the inner surface of the casing (23). A portion of light radiated by the light source (21) is internally reflected by the light transmitting reflecting plate (25) and by the light reflecting surface (24), in a space delimited in the casing (23) by the light transmitting reflecting plate (25), after which the light portion is transmitted through the light transmitting reflecting plate (25).