Backlit Display Screen Thermal Management via Segmented PCB and Conductive Plate
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Solution Overview
Problem
Backlit display screens in vehicle dashboards face heat management issues due to low thermal conductivity materials, leading to 'hot spots' that can damage components and affect performance.
Innovation Solution
A display screen design featuring a single-sided printed circuit board with a thermally conductive plate and a smaller double-sided printed circuit board, connected via electrical connections, enhances heat distribution and evacuation using a thermally conductive plate with convection areas and optional copper layers or fins for improved heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a closed housing is used to guarantee darkness inside the housing, then the display screen integration is improved, but heat evacuation is worsened leading to hot spots
Solution Approach 1:
The housing is segmented into light-blocking portions and heat evacuation portions. The light-blocking portions maintain darkness for display integrity, while dedicated heat evacuation portions with openings allow thermal energy to escape, resolving the contradiction between maintaining darkness and evacuating heat.
Solution Approach 2:
Different regions of the housing have different properties: some regions are designed for light blocking to maintain display darkness, while specific local regions (heat evacuation portions) are designed with thermal conductivity and openings to facilitate heat evacuation, allowing both functions to coexist.
2Ease of manufacture
If plates made of resin are used in the housing, then manufacturing is simplified, but thermal conductivity is worsened causing heat accumulation
Solution Approach 1:
The housing uses composite construction combining resin materials (for ease of manufacture) with thermally conductive materials in specific heat evacuation portions. This allows the majority of the housing to be easily manufactured from resin while critical thermal management areas use materials with superior heat conduction properties.
3Adaptability or versatility
If a double-sided printed circuit board is used, then component placement flexibility is improved, but production cost is worsened
Solution Approach 1:
The circuit board system is segmented into a single-sided printed circuit board for basic connections and a separate control unit for complex control functions. This segmentation allows using cost-effective single-sided PCB technology while still achieving the functionality of a double-sided board through modular architecture.
Solution Approach 2:
A control unit acts as an intermediary between the single-sided printed circuit board and the display elements. The control unit provides the adaptability and versatility typically requiring double-sided PCBs, while the single-sided PCB keeps manufacturing costs low by handling only essential signal routing.
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 effectively distributes heat produced by light-emitting diodes, reducing the risk of component damage and maintaining performance while potentially lowering production costs.
Implementation Method 1
a thermally conductive plate placed against that side of the printed circuit board which is opposite the side bearing the at least one light-emitting diode
Implementation Method 2
The thermally conductive plate makes contact with the exterior of the housing via a convection area
Data Source
AI summary
The invention relates to a display screen comprising: a housing forming an enclosure; a display surface on the front face of the housing; a printed circuit board arranged inside the housing; and at least one light-emitting diode that forms a back-lighting source for the display surface and is arranged on a face of the printed circuit board. The display screen is characterized in that the printed circuit board is a single-face printed circuit board, the display screen comprises a thermoconductive plate arranged against the face of the printed circuit board opposite the one carrying the at least one light-emitting diode, and the display screen also comprises a second double-face printed circuit board that has a smaller surface than the single-face printed circuit board, is connected to said single-face printed circuit board by at least one electrical connection, and carries at least one element for controlling the back-lighting of the display surface.