Liquid Crystal Display PCB Orientation for Heat Dissipation
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Solution Overview
Problem
Liquid crystal displays face challenges with heat radiation due to trapped heat, thickness limitations, and complex assembly processes, which hinder their ability to comply with slim design trends and reduce power consumption.
Innovation Solution
The design includes a liquid crystal display with a PCB for light sources exposed through an open bottom surface of the bottom cover, a main PCB inserted perpendicular to the liquid crystal panel, and a top case shielding the FPC, eliminating the need for shield covers and reducing assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the main PCB is located on the rear surface of the bottom cover, then the liquid crystal display can be assembled with conventional structures, but the thickness cannot be reduced and heat radiation is poor
Solution Approach 1:
The main PCB is repositioned from a horizontal arrangement on the rear surface to a vertical arrangement at the side surface of the liquid crystal display. This dimensional change allows the PCB to extend outward rather than occupying rear surface space, thereby reducing overall thickness while maintaining assembly feasibility through the side-mounted configuration
Solution Approach 2:
The main PCB is extracted from the conventional rear surface location and repositioned to the side surface. This extraction removes the thickness constraint imposed by rear surface mounting and enables better heat radiation by exposing the PCB to external environment rather than enclosing it within the display housing
2Reliability
If shield covers and conductive tapes are used to protect PCBs, then reliability against static electricity and environmental factors is improved, but device complexity and assembly steps increase
Solution Approach 1:
The protective functions previously requiring separate shield covers and conductive tapes are merged into the integrated housing structure. The housing itself is designed to provide both mechanical protection and electrical grounding, eliminating the need for additional protective components while maintaining reliability against static electricity and environmental factors
Solution Approach 2:
The housing structure is given multiple functions: it provides mechanical support, environmental protection, and electrical grounding simultaneously. This multi-functional design replaces the need for separate protective components, reducing overall device complexity while maintaining comprehensive protection for the PCB
3Reliability
If multiple components (shield covers, screws, adhesive tapes, conductive tapes) are used for assembly, then protection and functionality are ensured, but manufacturing costs and assembly complexity increase
Solution Approach 1:
Multiple protective and structural functions are merged into fewer integrated components. The housing structure combines mechanical support, protection, and grounding functions that previously required separate shield covers, adhesive tapes, and conductive tapes, thereby simplifying the assembly process and reducing manufacturing costs
Data Source
AI summary
The invention relate to a liquid crystal display that can improve heat radiation properties as well as may comply with a slim trend of displays. The liquid crystal display including: a liquid crystal panel; a PCB for light source that mounts a plurality of light sources which generate light illuminating the liquid crystal panel, and supplies operation power to the light sources; a bottom cover that includes a receiving unit of which bottom surface is opened and a seating space of which bottom surface is not opened, receives the PCB for light source, and externally exposes a part of a rear surface of the PCB for light source through the receiving unit; a main PCB that supplies a driving signal to the liquid crystal panel and the PCB for light source; and a panel guide that includes a lamination unit receiving the liquid crystal panel and an insertion space receiving the main PCB in a direction perpendicular to the liquid crystal panel, wherein the main PCB is inserted into the insertion space to be positioned within the seating space of the bottom cover.