Edge-Type Backlight Light Leakage Suppression
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Solution Overview
Problem
Display apparatuses with edge-type backlights experience light leakage, resulting in brighter areas adjacent to the light sources, leading to unwanted bright parts on the display panel.
Innovation Solution
Incorporating a dichroic filter and a black member to cover the space between the light sources and the light guide plate, where the dichroic filter selectively passes light and the black member absorbs or reflects excess light, preventing light leakage and bright part formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a light source is disposed to emit light toward a side of the light guide plate in an edge type display apparatus, then the backlight structure is simplified and light is supplied efficiently, but light leakage occurs causing bright parts to be generated at areas adjacent to the light source
Solution Approach 1:
A reflective member is introduced as an intermediary component between the light source and the display panel. This reflective member intercepts light that would otherwise leak directly into the display panel, reflecting it toward the light guide plate instead. The reflective member acts as a mediator that redirects harmful light leakage into useful light that contributes to uniform backlight illumination.
Solution Approach 2:
The invention converts the harmful light leakage into a beneficial effect by using the reflective member to redirect the leaked light toward the light guide plate. The light that would normally cause unwanted bright parts is now reflected to contribute to the overall backlight illumination, turning a disadvantage into an advantage.
2Device complexity
If light is emitted directly toward the light guide plate without additional components, then the device complexity is reduced, but uniformity of illumination is compromised due to light leakage
Solution Approach 1:
The reflective member serves as a minimal additional intermediary that corrects the illumination uniformity issue without requiring complete redesign of the backlight system. It is strategically positioned to intercept only the problematic leaked light while maintaining the overall simplicity of the edge-type backlight structure.
Solution Approach 2:
Instead of modifying the entire backlight system, the reflective member is applied locally at the specific region where light leakage occurs (adjacent to the light source). This localized solution addresses the uniformity issue only where needed, minimizing additional complexity while maximizing effectiveness.
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
Effectively suppresses the occurrence of bright parts by absorbing or redirecting light that would otherwise leak into the display panel, ensuring uniform illumination.
Implementation Method 1
a dichroic filter and a black member to cover a front of a space between a light source and a light guide plate
Implementation Method 2
most of the light emitted from the light source toward the dichroic filter may be absorbed by the black member
Data Source
Figure 1~2
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Figure 5
AI summary
Disclosed is a display apparatus including a display panel, a light guiding plate disposed behind the display panel, a light source disposed to oppose a side of the light guiding plate, a dichroic filter disposed to cover a front side of a space between the light source and the side of the light guiding plate, and a black member disposed in front of the dichroic filter. Here, since light emitted forward from the light source toward the dichroic filter is generally absorbed by the black member or incident on the light guiding plate, the occurrence of bright parts caused by light leakage is suppressed.