Display Apparatus Light Source Orientation for Luminance Uniformity
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Solution Overview
Problem
Transparent display apparatuses often experience the formation of dark or bright lines near the incident-light portion due to unstable angle distribution of incident light, which affects luminance and display quality.
Innovation Solution
The display apparatus incorporates a light source unit with light emitting elements arranged at different directions relative to the side surface of the light guide plate, reducing the bias in angle distribution without the need for surface modifications like convex or concave portions, by optimizing the arrangement of light source units in the thickness direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are arranged to face the side surface of the light guide plate, then luminance is improved, but dark or bright lines are formed near the incident-light portion
Solution Approach 1:
The light emitting elements are arranged with different orientations relative to the side surface of the light guide plate. Specifically, some light emitting elements have their light emitting surfaces facing the side surface at different angles, creating local variations in light emission characteristics that collectively achieve uniform luminance distribution and prevent dark or bright line formation.
Solution Approach 2:
The arrangement of light emitting elements introduces asymmetry in their orientations. Instead of all elements facing the side surface at the same angle, elements are positioned at different angles (e.g., some at 0 degrees, others at non-zero angles relative to the normal of the side surface). This asymmetric arrangement distributes light more evenly across the incident-light portion, eliminating the formation of dark or bright lines.
2Illumination intensity
If surface roughness is increased to reflect light, then luminance is improved, but display quality decreases
Solution Approach 1:
Instead of modifying the surface of the light guide plate to increase roughness for light reflection, the invention inverts the approach by modifying the arrangement and orientation of the light emitting elements themselves. By controlling how light is emitted from the source elements at different angles, the patent achieves uniform luminance distribution without needing to alter the surface properties of the light guide plate, thereby maintaining display 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 configuration effectively suppresses the formation of dark or bright lines near the incident-light portion, improving luminance uniformity and display quality by stabilizing the angle distribution of incident light.
Implementation Method 1
a light source unit including a plurality of light emitting elements arranged along a first direction at a position facing the side surface of the light guide plate
Implementation Method 2
Light emitted from the light source unit is made incident on the side surface of the light guide plate, is diffused in a liquid crystal layer while scattering inside a liquid crystal panel
Implementation Method 3
guiding light emitted from the light emitting element to make the light incident into the transparent substrate... increasing surface roughness of the side surface to reflect light emitted from the light emitting element
Data Source
AI summary
A display apparatus includes: a first substrate having a first front surface and a first back surface that is an opposite surface of the first front surface; a liquid crystal layer arranged on the first front surface of the first substrate; a light guide plate having a first main surface facing the first front surface, a second main surface that is an opposite surface of the first main surface and a side surface crossing the first main surface and the second main surface; and a light source unit including a plurality of light emitting elements arranged along a first direction at a position facing the side surface of the light guide plate, and a light emitting surface of the light source unit is arranged to have a different direction from a direction of the side surface of the light guide plate in a thickness direction of the light guide plate.