Backlight Module Oblique Side Wall Luminance Uniformity
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Solution Overview
Problem
Conventional backlight modules for LCDs suffer from non-uniform luminance distribution, leading to dark areas and poor display quality due to uneven light emission from lamps without uniform phosphor powder coating at electrode ends.
Innovation Solution
A backlight module design featuring a frame with a lamp stationary barrier having oblique or curved side walls that cover the electrode ends, along with a reflective layer and optical films, to redirect light and enhance luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If lamps are arranged in parallel with regular intervals in the frame, then a surface light source is formed, but the electrode ends produce dark areas with low luminance
Solution Approach 1:
The patent applies local quality by creating a lamp stationary barrier with different structural characteristics at different locations. The barrier has a first section with a first refractive index and a second section with a second refractive index, where the refractive indices are different. This allows different parts of the barrier to perform different optical functions: the first section primarily supports the lamp while the second section redirects light from electrode ends to improve luminance uniformity across the display surface.
Solution Approach 2:
The lamp stationary barrier acts as an intermediary element between the lamp and the display surface. It mediates the light propagation by utilizing refraction at the interface between sections with different refractive indices, redirecting light that would otherwise create dark areas at electrode ends, thereby improving overall luminance uniformity without requiring changes to the lamp arrangement.
2Ease of manufacture
If the tube walls at the electrode ends are not coated with phosphor powders uniformly, then manufacturing is simplified, but dark areas are generated on the LCD
Solution Approach 1:
The patent converts the harmful effect of non-uniform phosphor coating (which creates dark areas) into a beneficial outcome by using the lamp stationary barrier with different refractive indices. The barrier refracts light to redirect it toward electrode end regions, transforming the原本的 dark areas into brighter regions, thereby compensating for the manufacturing simplification's negative impact on luminance uniformity.
3Illumination intensity
If a lamp stationary barrier with oblique side walls is introduced to improve luminance uniformity, then display quality is enhanced, but device complexity increases
Solution Approach 1:
The lamp stationary barrier is designed to perform multiple functions simultaneously: it provides mechanical support to hold the lamp in position, and it acts as an optical element with different refractive indices to redirect light and improve luminance uniformity. By combining these functions into a single component, the patent reduces the need for additional separate structures, thereby limiting the increase in device complexity while achieving improved 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
The solution significantly improves luminance uniformity by redirecting light to electrode ends, resulting in consistent brightness and enhanced display quality for LCDs.
Implementation Method 1
The side wall is formed by oblique lines, a first angle is formed between the oblique line adjacent to the base plate and the base plate
Data Source
AI summary
A backlight module includes a frame, a lamp stationary barrier, and at least one lamp. The lamp stationary barrier has at least one side wall formed by oblique lines. The lamp is disposed in the frame, and at least a portion of an electrode end of the lamp is covered by the side wall. The oblique side wall may effectively improve the luminance uniformity of the backlight module, and thus a liquid crystal display using this backlight module has good display quality.