Extended Reality Display Modules with Multiplexed Flexible Connections
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Solution Overview
Problem
Conventional head-mounted extended reality devices face challenges in adjusting interpupillary distance (IPD) without increasing size and power consumption, and high pixel density requires numerous connection pins in a limited space, complicating manufacturing and increasing costs.
Innovation Solution
A display apparatus with a multiplexer and demultiplexer on each substrate, connected by a flexible circuit board with reduced connection pins, allowing for efficient electrical connection between display modules while maintaining high resolution and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high pixel density is used to improve display resolution, then image quality is improved, but the number of connection pins required increases, making manufacturing more complex and costly
Solution Approach 1:
The patent merges multiple signal lines into a single line by using multiplexers and demultiplexers. The multiplexer on the first substrate combines N signal lines into M fewer lines, which are then transmitted through the flexible circuit board. The demultiplexer on the second substrate separates these M lines back into N signal lines. This merging approach reduces the number of connection pins from N to M, simplifying manufacturing while maintaining high display resolution through the multiplexed signal transmission.
2Reliability
If more connection pins are used to connect high pixel density display modules, then electrical connection reliability is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The patent applies multiplexing to merge multiple signal lines into fewer lines, reducing the total number of connection pins required. The multiplexer consolidates N signal lines into M lines (where M < N), and the demultiplexer redistributes them to the respective display modules. This reduces manufacturing complexity and cost while maintaining reliable electrical connections through proper signal multiplexing and demultiplexing mechanisms.
3Ease of manufacture
If the number of connection pins is reduced to simplify manufacturing, then manufacturing cost decreases, but the difficulty of designing and fabricating the flexible circuit board increases
Solution Approach 1:
The patent merges multiple signal lines into fewer lines using multiplexers, reducing the number of connection pins from N to M. This reduction simplifies the flexible circuit board design and fabrication process, lowering manufacturing costs. The multiplexer and demultiplexer handle the signal distribution, allowing for fewer, more easily fabricable connection pins while maintaining proper electrical connections to all display module elements.
Data Source
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AI summary
The present disclosure relates to a display apparatus and an extended reality device. The display apparatus comprises: a first display module, a second display module and a first flexible circuit board. The first display module comprises a first substrate, N first signal lines and a multiplexer being arranged on the first substrate, a first connection end of the first flexible circuit board being fixed on the first substrate, and the multiplexer being electrically connected between the first connection end of the first flexible circuit board and the first signal lines. The second display module comprises a second substrate, N second signal lines and a first demultiplexer being arranged on the second substrate, a second connection end of the first flexible circuit board being fixed to the second substrate, and the first demultiplexer being electrically connected between the second connection end of the first flexible circuit board and the second signal lines. The number of electrical connection lines in the first flexible circuit board is M, M being less than N, and M and N being both positive integers.