LED Backlight Module with Buried Light Bar in Frame Cavity
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Solution Overview
Problem
Conventional liquid crystal display (LCD) backlight modules using cold cathode fluorescent lamps (CCFLs) are limited in color specification improvement and do not meet green product requirements, while LED-based modules have complex mechanical structures and higher costs due to the need for complicated light mixing designs and assembly components.
Innovation Solution
A liquid crystal display with a light guide plate, a liquid crystal panel, and a frame that includes a light bar buried in a cavity within the frame wall, eliminating the need for extra shadow tape or light source reflectors and allowing for a plug-and-play assembly, which simplifies the structure and reduces labor and material costs while enhancing light utility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If LED arrays are positioned at two sides of the BLM with ESRs and light pipes for light reflection and mixing, then light utility is improved, but device complexity and assembly complexity increase significantly
Solution Approach 1:
The patent merges the light source, light guide plate, and reflector into an integrated LED bar assembly. The LED bar directly contacts the light guide plate, eliminating the need for separate ESRs and light pipes. This consolidation reduces the number of components and assembly steps while maintaining effective light transmission.
Solution Approach 2:
The light guide plate serves multiple functions: it guides light from the LED bar, replaces the need for separate reflectors through its reflective properties, and eliminates the need for additional light mixing components. This multi-functionality reduces overall device complexity.
2Ease of manufacture
If CCFL is used as light source, then assembly is simpler, but color specification improvement is limited and green product requirements are not met
Solution Approach 1:
The patent transitions from CCFL to LED light sources, changing the fundamental illumination parameter. LEDs provide superior color specifications and meet green product requirements while the integrated design maintains assembly simplicity. The LED bar's direct contact with the light guide plate ensures efficient light transmission.
3Loss of energy
If shadow tape and light source reflectors are added to avoid light loss, then light utility improves, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent extracts and eliminates the shadow tape and separate light source reflectors from the design. The light guide plate's reflective properties and the LED bar's positioning inherently prevent light loss without requiring these additional components, reducing manufacturing cost and simplifying production.
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
This design reduces assembly complexity, saves labor and materials, and provides high light utility by directly penetrating light from the light source into the light guide plate, resulting in a cost-effective and efficient backlight module with a simplified structure.
Implementation Method 1
a light bar, wherein the light bar is buried in the light bar cavity
Implementation Method 2
provides high light utility by directly penetrating light from the light source into the light guide plate
Data Source
AI summary
A liquid crystal display has a light guide plate, a liquid crystal panel disposed on the light guide plate, a frame having a compartment for containing the light guide plate and a frame wall having an opening and a light bar cavity, and a light bar buried in the light bar cavity via the opening.