Backlight Module with Bent Substrate for LCD Brightness
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Solution Overview
Problem
Conventional liquid crystal display (LCD) backlight modules experience insufficient brightness in the middle region due to the corner lighting arrangement of LEDs, which makes it difficult to adjust optical performance effectively, leading to dark regions on the screen.
Innovation Solution
A backlight module and light source module design that combines side-view LEDs and top-view LEDs, with substrates configured to direct light emissions such that the first light source illuminates the corners and the second light source, which is thinner, is positioned to improve brightness in the middle region, increasing the A/P ratio and reducing hot spots caused by uneven light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If corner lighting arrangement is used, then device complexity is reduced, but illumination intensity in the middle region deteriorates
Solution Approach 1:
The light source module is segmented into two distinct parts: a first substrate portion with first light sources for corner lighting, and a second substrate portion with second light sources for middle region illumination. This segmentation allows each part to be optimized for its specific function, resolving the contradiction between simple arrangement and middle region brightness.
Solution Approach 2:
Different regions of the substrate are assigned different functions: the first substrate portion handles corner lighting while the second substrate portion handles middle region illumination. The second substrate portion is specifically designed with a bending structure to direct light toward the middle region, providing localized quality improvement where needed.
2Manufacturing precision
If only side-view LED is used, then manufacturing precision is improved, but illumination intensity in the middle region deteriorates
Solution Approach 1:
The patent merges two types of LED arrangements (side-view LED and top-view LED) into a single light source module. The first light sources are side-view LEDs while the second light sources are top-view LEDs. This combination allows the system to benefit from both manufacturing precision of side-view LEDs and the middle region illumination capability of top-view LEDs.
3Stability of the object's composition
If uniform light intensity is maintained, then homogeneity is improved, but hot spot phenomenon worsens
Solution Approach 1:
The patent changes the geometric parameters of the light source module by introducing a bending structure in the second substrate portion. This bending structure alters the light emission angle and distribution pattern, redirecting light toward the middle region while reducing concentration in specific areas, thereby mitigating the hot spot phenomenon.
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 effectively enhances brightness in the middle region of the LCD and reduces the hot spot phenomenon by optimizing light distribution, increasing the A/P ratio and improving light guiding efficiency.
Implementation Method 1
The light source module includes a substrate, at least one first light source, and at least one second light source
Implementation Method 2
a light guiding plate having a light incident side and a corner area located at two ends of the light incident side
Data Source
AI summary
A backlight module and a light source module thereof are disclosed. The light source module includes a substrate, at least one first light source, and at least one second light source. The substrate includes a first substrate portion and a second substrate portion. The first substrate portion extends along a length direction, and the second substrate portion bends an acute angle corresponding to an extending surface of the first substrate portion. The at least one first light source and the at least one second light source are disposed on the first substrate portion and the second substrate portion respectively. The acute angle is existed between the light-emitting directions of the first light source and the second light source, and the light-emitting directions are parallel to the first substrate portion.