Light Redirection Film for Reflective Display Color Accuracy
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Solution Overview
Problem
Reflective display panels in e-book readers face issues with inappropriate color rendering due to excessive incident angles of light from front light modules, leading to incorrect color representation, especially in low ambient light conditions.
Innovation Solution
Incorporating a light redirection film between the light guide plate and the reflective display panel to redirect light travel along a more perpendicular direction, reducing the incident angle and preventing incorrect color rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a front light module is used to provide sufficient light to the reflective display panel in weak ambient light conditions, then image rendering capability is improved, but incident angle becomes too great causing inappropriate color rendering
Solution Approach 1:
A light redirection film is introduced as an intermediary component between the light guide plate and the reflective display panel. This film redirects the light paths from high incident angles to more perpendicular angles, serving as a mediator that transforms the light direction without blocking the light path, thereby resolving the contradiction between providing sufficient light and ensuring accurate color rendering
Solution Approach 2:
The light redirection film changes the angular parameter of the light paths by redirecting them from oblique angles to more perpendicular directions. This parameter transformation (changing the incident angle) allows the system to maintain both sufficient light intensity and accurate color rendering simultaneously
2Illumination intensity
If light travels at a great outgoing angle from the light guide plate, then light distribution is improved, but light passes through different light filter zones causing incorrect color rendering
Solution Approach 1:
The light redirection film acts as a mediator between the light guide plate and the color filter, transforming the light paths to ensure they pass through the same color filter zone. This intermediary component guarantees consistent color representation while maintaining good light distribution
Solution Approach 2:
The light redirection film performs a preliminary action by pre-redirecting the light paths before they reach the color filter zone. This preliminary redirection prevents the light from passing through different color filter zones, thereby preventing incorrect color rendering before it can occur
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 light redirection film effectively reduces the incident angle of light into the reflective display panel, ensuring accurate color rendering and improved image clarity, even in low ambient light conditions.
Implementation Method 1
The light redirection film is located beside the inner light outgoing surface, and is configured to redirect a traveling direction of the light from the light guide plate. An acute included angle between the light after redirected and a normal line of the inner light outgoing surface is less than an acute included angle between the light before redirected and the normal line of the inner light outgoing surface.
Data Source
AI summary
A front light module includes a light guide plate, a light source and a light redirection film. The light guide plate includes a light incident surface, an inner light outgoing surface and an outer light outgoing surface. The light incident surface is adjoined between the inner light outgoing surface and the outer light outgoing surface. The light source is configured to emit light into the light incident surface of the light guide plate. The light redirection film is located beside the inner light outgoing surface, and is configured to redirect a traveling direction of the light from the light guide plate. An acute included angle between the light after redirected and a normal line of the inner light outgoing surface is less than an acute included angle between the light before redirected and the normal line of the inner light outgoing surface.