Diffusion Film for Backlight Brightness Uniformity
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Solution Overview
Problem
Large electronic devices experience noticeable brightness differences across their display regions due to the conventional backlighting methods, affecting the overall display quality.
Innovation Solution
A display device comprising a backlight module with a light guide plate, a light source assembly, and a first diffusion film, where the light source assembly emits light towards the side surface of the light guide plate, and the first diffusion film, positioned on the opposite surface, diffuses the light to enhance brightness uniformity across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light guide plate is used to guide light from the light source assembly, then the display device can achieve backlight function, but obvious brightness difference appears in the display region
Solution Approach 1:
A first diffusion film is introduced as an intermediary component between the light guide plate and the display panel. This diffusion film receives light from the light guide plate and redistributes it uniformly across the display region, eliminating the brightness difference caused by direct light guidance while maintaining the backlight function.
Solution Approach 2:
The patent changes the optical parameters of the light transmission path by introducing a diffusion film with specific diffusion characteristics. This modifies how light propagates through the system, transforming concentrated light from the light guide plate into uniformly distributed light across the display region.
2Area of stationary object
If the display size is increased, then the display device can provide larger viewing area, but brightness difference in the display region becomes more obvious
Solution Approach 1:
The first diffusion film serves as a mediator that becomes increasingly important as display size increases. It ensures that light from the light source assembly is evenly distributed across the entire larger display region, preventing the brightness non-uniformity that would otherwise become more pronounced with increased display area.
Solution Approach 2:
The patent addresses the two-dimensional brightness distribution problem by introducing a diffusion process that operates in multiple directions. The diffusion film scatters light in various angles, effectively transforming the one-dimensional light path from the light guide plate into two-dimensional uniform illumination across the expanded display area.
3Device complexity
If light is emitted directly from the light source assembly to the display panel, then the structure can be simplified, but brightness uniformity across the display region deteriorates
Solution Approach 1:
The first diffusion film is positioned between the light guide plate and the display panel, serving as a simple yet effective intermediary component. It maintains relatively simple overall structure while performing the critical function of light uniformization, achieving a good balance between structural simplicity and brightness uniformity.
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 solution ensures balanced light intensity across the display region, reducing brightness variations and improving the overall display effect by diffusing light from the light source assembly to areas away from the source, thus enhancing the uniformity of the backlight module's light emission.
Implementation Method 1
the first diffusion film is configured to diffuse incident light, which is emitted to the first diffusion film from the light source assembly, to the display region
Data Source
AI summary
A display device and an electronic device are provided. The display device includes a backlight module and a display panel. The backlight module includes a light guide plate, a light source assembly, and a first diffusion film. The light guide plate has a first surface, a second surface disposed opposite to the first surface, and a side surface connected between the first surface and the second surface. The light source assembly is configured to emit light toward the side surface of the light guide plate. The first diffusion film is disposed on the second surface of the light guide plate and close to the light source assembly. The display panel is stacked on the first surface of the light guide plate, the display panel has a display region and a non-display region, and the first diffusion film is configured to diffuse incident light to the display region.