Display Module Optical Film Brightness Uniformity
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Solution Overview
Problem
Side-type backlight modules in liquid crystal displays suffer from low uniformity of brightness, leading to suboptimal display quality due to hot spots and bright lines at edges, which existing technologies have not adequately addressed.
Innovation Solution
A display module design featuring a first optical film with a main portion of greater height than its peripheral portion, creating an inclined-downward morphology that scatters incident lights and reduces the occurrence of hot spots and bright lines, thereby enhancing brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a side-type backlight module is used, then the thickness is reduced, but the brightness uniformity deteriorates due to hot spots and bright lines at edges
Solution Approach 1:
The first optical film is designed with different heights in different regions: the first height in the main portion and the second height in the peripheral portion, where the first height is greater than the second height. This local differentiation in the optical film's structure creates an inclined-downward morphology that selectively scatters light in different zones, thereby improving brightness uniformity while maintaining the side-type backlight module's thin profile.
2Illumination intensity
If light is concentrated at the peripheral region, then the edge brightness increases, but hot spots and bright lines are generated reducing display quality
Solution Approach 1:
The first optical film's peripheral portion is designed with an inclined-downward morphology, creating a curved or sloped surface rather than a flat one. This curvature causes incident light to be scattered at different angles, preventing concentration of light at specific edge points and thereby eliminating hot spots and bright lines while maintaining adequate edge brightness.
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 effectively improves brightness uniformity by scattering lights away from the edges, reducing the likelihood of hot spots and bright lines, resulting in improved display quality.
Implementation Method 1
the peripheral region of the first optical film has an inclined-downward morphology, thereby lights centered around the peripheral region of the first optical film can be scattered away
Data Source
AI summary
A display module including a display panel and a backlight module disposed on a side of the display panel is provided. The backlight module includes a light guide, a light emitting diode, and a first optical film. The light emitting diode has a light emitting surface adjacent to the light guide. The first optical film is located between the light guide and the display panel. The first optical film includes a first prisms extending along a first direction. The first prisms has a first unit area and a second unit area. A first part of the first prism in the first unit area has a first average height larger than a second average height of a second part of the first prism in the second unit area.