Display Device Light Flux Control and Reflective Portions for Brightness Uniformity
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Solution Overview
Problem
LCDs face challenges in achieving brightness uniformity while maintaining a small size, as the distance between the Back Light Unit (BLU) and the LCD panel affects the performance and thickness of the display.
Innovation Solution
Incorporating light sources, light flux control members, and reflective portions on a drive substrate to diffuse and reflect light, allowing for effective irradiation of the LCD panel without increasing the number of light sources, thereby reducing the thickness and ensuring brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the distance between the BLU and the LCD panel is increased, then brightness uniformity is improved, but the thickness of the LCD becomes large
Solution Approach 1:
The invention divides the light irradiation function into multiple segments: light sources generate light, light flux control members guide and diffuse light, and reflective portions redirect light. This segmentation allows effective light distribution to the LCD panel without requiring a large distance, thus resolving the contradiction between brightness uniformity and thinness.
Solution Approach 2:
The light flux control member acts as an intermediary between the light source and the LCD panel, diffusing and guiding light to achieve uniform illumination. The reflective portions serve as additional intermediaries to redirect light that would otherwise be lost, enabling brightness uniformity without increasing the distance between BLU and LCD panel.
2Illumination intensity
If the number of light sources is increased, then light irradiation effectiveness is improved, but device complexity and size increase
Solution Approach 1:
The light flux control member serves as an intermediary that enhances the effectiveness of each light source by diffusing and guiding light more efficiently. This intermediary approach improves light irradiation effectiveness without requiring an increased number of light sources, thereby avoiding additional device complexity.
Solution Approach 2:
The invention replaces the mechanical approach of adding more light sources with an optical approach using light flux control members and reflective portions. This substitution achieves improved light irradiation effectiveness through optical manipulation rather than simply increasing the quantity of light sources.
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 ensures brightness uniformity while minimizing the size of the display device by diffusing light and reducing the space between the light emitting device and the LCD panel, without the need for additional light sources.
Implementation Method 1
light flux control members to refract the light
Implementation Method 2
reflective portions disposed in at least one of the drive substrate and the cover to reflect the refracted light
Data Source
AI summary
Disclosed is a display device. The display device includes light sources to generate light; light flux control members to refract the light; a drive substrate on which the light sources are mounted; a cover to cover the drive substrate; reflective portions disposed in at least one of the drive substrate and the cover to reflect the refracted light; and a display panel into which the reflected light is incident.