Backlight Prism Groove Structure for Two-Direction Luminance
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Solution Overview
Problem
Existing edge-lit backlights lack sufficient luminance improvements in two directions required for displays capable of presenting different images in two directions.
Innovation Solution
A backlight design featuring a light guide plate with a first prism surface having grooves in a specific orientation and a prism sheet with grooves facing the first prism surface, eliminating the diffusion sheet to enhance luminance in two directions by directing light emission peaks away from the vertical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffusion sheet is used in edge-lit backlights, then light distribution is improved, but luminance in two directions is insufficient
Solution Approach 1:
The patent removes the diffusion sheet from the backlight structure and replaces it with a prism sheet having grooves oriented at 45 degrees to the light incident direction. This extraction of the diffusion sheet function and replacement with a prism-based solution enables achieving luminance peaks in two directions (left and right) while simplifying the overall device structure.
Solution Approach 2:
The patent changes the optical parameter by introducing a prism sheet with specific groove orientation (45 degrees to the light incident direction) instead of a diffusion sheet. This parameter change in the optical element's geometry and orientation enables the light to be distributed in a way that creates luminance peaks in two directions, solving the luminance improvement problem.
2Illumination intensity
If traditional edge-lit backlight structure is used, then device simplicity is maintained, but luminance peaks are not achieved in two directions
Solution Approach 1:
The patent modifies the optical element parameters by introducing a prism sheet with grooves oriented at 45 degrees to the light incident direction. This specific angular parameter change enables the light to be redirected to create luminance peaks in two directions (left and right of the vertical axis), achieving the desired luminance distribution while maintaining manufacturing feasibility through standard prism fabrication processes.
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 design achieves improved luminance in two directions, enhancing the display's capability to present distinct images, with luminance peaks observed in angles of +30 degrees or more and −30 degrees or less, surpassing traditional designs.
Implementation Method 1
a light guide plate including an end face that serves as an incident surface of light from the light source
Implementation Method 2
the first prism surface including first grooves... the second prism surface including second grooves... peaks of luminous intensity are observed in two directions excluding the vertical direction
Data Source
AI summary
A backlight includes: a light guide plate a first prism surface, the first prism surface including first grooves, the first grooves being adjacent in a first direction and extending in a second direction, the first direction and the second direction being perpendicular; and a prism sheet overlapping with the light guide plate, the prism sheet including a second prism surface directly facing the first prism surface, and a flat surface on a side opposite to the second prism surface, the second prism surface including second grooves, the second grooves being adjacent in the first direction and extending in the second direction. In light distribution characteristics on a first vertical plane spreading in the first direction and a vertical direction that is perpendicular to both the first direction and the second direction, peaks of luminous intensity are observed in two directions excluding the vertical direction.