Display Panel Demultiplexing for Fine-Pitch IC Bonding
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Solution Overview
Problem
The challenge of bonding a drive IC to a high-resolution display panel in personal immersive devices without electrical contact failure is exacerbated by the small size and high-resolution pixels, which require a fine pitch between pads, making it difficult to avoid short circuits.
Innovation Solution
Incorporating a demultiplexer and sample & holders on the display panel to reduce the number of data pads and widen the pitch between them, allowing for the drive IC to be bonded without electrical contact failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution pixels are arranged in a small display panel, then pixel resolution is improved, but pad pitch becomes fine making bonding difficult
Solution Approach 1:
The invention segments the data signal transmission by introducing a demultiplexer that divides one data signal into multiple separate data signals. This allows a single data pad to serve multiple sub-pixels through internal segmentation, reducing the total number of pads required and thereby increasing pad pitch for reliable bonding while maintaining high pixel resolution.
Solution Approach 2:
The demultiplexer acts as an intermediary component between the data pad and the sub-pixels. It receives a single data signal and distributes it to multiple sub-pixels, enabling a reduction in the number of direct connections (pads) required while maintaining full functionality for high-resolution display.
2Productivity
If many pads are disposed at high density, then data signal transmission capacity is improved, but electrical contact failure risk increases
Solution Approach 1:
The demultiplexer segments the high-capacity data transmission function into multiple lower-capacity parallel channels. By dividing one high-speed data signal into multiple separate signals, the system maintains overall transmission capacity while using fewer, more widely spaced pads that are less prone to electrical contact failures during bonding.
Solution Approach 2:
The invention changes the parameter of pad density by reducing the number of pads through demultiplexing. This parameter change from high density to moderate density improves electrical contact reliability during bonding while the demultiplexer compensates to maintain the required data transmission capacity.
Data Source
AI summary
A display panel, a display device including the display panel, and a personal immersive system using the display device includes a sample & holder that sequentially samples a data voltage sequentially outputted from a demultiplexer and then simultaneously output the data voltage to a plurality of data lines, and sub-pixels that sequentially charge the data voltage inputted from the sample & holder in response to a scan pulse.