Light Guide Notch Reflection Control for Display Uniformity
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Solution Overview
Problem
Existing light source devices with light guide plates and reflection sheets experience uneven luminance due to irregular reflections at notch parts, leading to increased manufacturing costs and reduced display screen area.
Innovation Solution
A light source device with a reflection sheet featuring a low-reflection part around the notch part, having a reflectance lower than the reflection sheet, which suppresses irregular reflections on the light guide plate's side face, and a film with decreasing reflectance and density far from the notch part, along with a mirror-finished side face and lens-shaped surfaces to stabilize light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a positioning part is used to fix the light guide plate, then the position stability is improved, but uneven luminance occurs due to irregular reflection at the notch part
Solution Approach 1:
The reflection sheet is designed with different reflectance properties in different regions: a first reflection region with higher reflectance and a second reflection region (around the notch part) with lower reflectance. This local differentiation allows the positioning part to maintain position stability while the low-reflectance region suppresses irregular reflections that cause luminance unevenness.
2Illumination intensity
If a covering film with lower reflectance is applied to the positioning part, then luminance uniformity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The reflection sheet combines multiple functions into a single component: it provides the reflective function for light guidance while simultaneously incorporating the low-reflectance region that suppresses irregular reflections. This eliminates the need for a separate covering film on the positioning part, reducing manufacturing complexity.
3Illumination intensity
If the frame part width is increased to cover the notch part, then luminance uniformity is improved, but the display screen area decreases
Solution Approach 1:
The harmful irregular reflections from the notch part are extracted and suppressed by the second reflection region with lower reflectance on the reflection sheet. This allows the frame part to be narrower since the source of luminance unevenness is actively suppressed rather than passively covered, thereby preserving display screen area.
4Ease of manufacture
If the side face of the light guide plate is not mirror-finished at the notch part, then manufacturing is simplified, but irregular reflection occurs causing luminance unevenness
Solution Approach 1:
The reflection sheet acts as an intermediary between the light guide plate and the environment. The second reflection region with lower reflectance on the reflection sheet compensates for the irregular reflections from the non-mirror-finished side face, allowing manufacturing simplicity to be maintained while luminance uniformity is improved.
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
Prevents uneven luminance and maintains display quality while narrowing the frame width, providing a wider image display range by uniformly suppressing reflections and reducing light emission towards the notch part.
Implementation Method 1
the reflection sheet includes a low-reflection part which is provided around the notch part of a surface facing the light guide plate and has a reflectance lower than that of the reflection sheet, and thereby it is possible to suppress reflection of residual light which is irregularly reflected on a side face of the light guide plate relating to the notch part
Implementation Method 2
the light guide plate irradiates a display panel which displays an image with light from a light source while propagating the light inside thereof in a plane manner
Data Source
AI summary
Provided are a light source device capable of suppressing reflection of light which is irregularly reflected on a side face relating to a notch part, and a display apparatus. The light source device includes a light guide plate having a notch part formed at an edge part thereof, and a reflection sheet which is disposed to face the light guide plate and has a notch part formed at an edge part corresponding to the notch part, wherein the reflection sheet includes a low-reflection part which is provided around the notch part of a surface facing the light guide plate and has a reflectance lower than that of the reflection sheet.