Electronic Paper Screen Module With Through-Substrate LED Layout
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Solution Overview
Problem
Conventional electronic paper screen modules require LED lamps to be placed outside the TFT substrate to allow light transmission, leading to increased size and cost due to the enlargement of the PCB board and bezel.
Innovation Solution
An electronic paper screen module design where a light-transmitting area is disposed on the substrate, allowing the LED lamp to be positioned within the substrate's range, with light emitted by the LED lamp passing through this area, thereby reducing the need for a larger circuit board and bezel size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the LED lamp is placed outside the TFT substrate to allow light transmission, then light transmission efficiency is improved, but the size and cost of the PCB board and bezel increase
Solution Approach 1:
The patent changes the spatial arrangement by stacking the circuit board on top of the substrate in the vertical dimension, allowing the LED lamp to be positioned within the substrate's horizontal range. This vertical stacking enables light transmission through the substrate without requiring the LED to be placed outside the substrate boundaries, thus reducing PCB board size while maintaining light transmission efficiency
Solution Approach 2:
The patent implements a nested structure where the circuit board is stacked on the substrate, and the LED lamp is positioned within the area covered by the substrate. This nesting arrangement allows the LED to be contained within the substrate's horizontal footprint while still achieving effective light transmission through the substrate material, eliminating the need for enlarged PCB and bezel structures
2Illumination intensity
If the LED lamp is placed outside the TFT substrate to allow light transmission, then light transmission efficiency is improved, but the cost of the PCB board increases
Solution Approach 1:
By transitioning to vertical stacking in the third dimension, the patent reduces the horizontal area requirements for the PCB board. This dimensional change allows standard-sized PCB boards to be used without requiring larger, more expensive custom PCB designs, thereby reducing manufacturing costs while preserving light transmission efficiency
Solution Approach 2:
The patent changes the structural parameters of the display module by implementing vertical stacking instead of horizontal expansion. This parameter change reduces the PCB board area requirements, allowing the use of smaller, more cost-effective PCB boards that meet standard manufacturing specifications, thus lowering overall manufacturing costs
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 ensures effective light emission within the substrate's range, reducing the size and cost of the electronic paper screen module while maintaining a good display effect.
Implementation Method 1
The light-emitting element is disposed on the circuit board and located opposite to the first light-transmitting portion, so as to allow light emitted by the light-emitting element to pass through the first light-transmitting portion
Data Source
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Figure 3
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AI summary
An electronic paper screen module, including a substrate provided with a first light-transmitting portion; a circuit board, at least part of which is stacked with the substrate; and a light-emitting element disposed on the circuit board and located opposite to the first light-transmitting portion, so that light emitted by the light-emitting element can pass through the first light-transmitting portion from one side of the substrate to the other side facing away from the circuit board. The present disclosure solves the technical problem that the size and the cost of the electronic paper screen are increased due to the disposing of an LED lamp.