Narrow-bezel Display Module Drive Chip Rotation
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Solution Overview
Problem
Conventional chip-on-glass bonding methods result in a large bottom border of display panels due to the proximity of the integrated circuit's input and output ends to the display region, limiting the reduction of the screen ratio.
Innovation Solution
A narrow-bezel display module design that reduces the wiring distance between the flexible printed circuit board and the drive chip by rotating the drive chip and using a flexible printed circuit board with specific connection portions to connect the drive chip's side surfaces at a horizontal level, allowing the output signal to be transmitted through a second metal layer, thereby reducing the size and thickness of the bottom border.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the input end and output end of the IC are positioned close to the display region, then the IC can be compactly integrated, but the bottom border size increases
Solution Approach 1:
The patent inverts the conventional IC orientation by positioning the input end away from the display region and the output end close to the display region. This reversal allows the FPC connection to be made at the input end without increasing the bottom border size, while the output end can drive the display region directly. The inversion resolves the contradiction by changing the spatial arrangement logic from conventional to non-conventional.
Solution Approach 2:
The patent utilizes the flexible printed circuit board's flexibility to create a three-dimensional connection path that connects to the IC's input end from a different spatial dimension. The FPC can bend and extend to reach the input end without requiring additional horizontal space in the bottom border region, effectively using vertical and lateral flexibility to resolve the spatial conflict.
2Reliability
If the FPC is connected to the input end of the IC, then the IC can receive control signals, but the bottom border cannot be reduced
Solution Approach 1:
Instead of connecting the FPC to the input end located near the display region (conventional approach), the patent inverts the arrangement by positioning the input end away from the display region and connecting the FPC there. This allows the FPC connection to be made without encroaching on the bottom border space, while still ensuring reliable signal transmission to the IC.
Solution Approach 2:
The patent employs a flexible printed circuit board that can bend and conform to the spatial requirements of the IC mounting arrangement. The FPC's flexibility allows it to extend and connect to the input end without requiring a large bottom border area, using its thin-film structure to adapt to the optimized IC positioning.
3Area of stationary object
If the bottom border is made narrow to increase screen ratio, then the display area increases, but the wiring distance between FPC and drive chip increases
Solution Approach 1:
The patent inverts the conventional IC orientation so that the input end (connected to FPC) is positioned away from the display region, while the output end is close to the display region. This inversion allows the narrow bottom border design to be maintained while the FPC connects to the input end through flexible routing, and the output end can drive the display with minimal wiring distance.
Solution Approach 2:
The patent changes the spatial parameters of the IC mounting by rotating or repositioning the IC orientation. This parameter change allows the input and output ends to be positioned at optimal locations that simultaneously satisfy the narrow bottom border requirement and minimize the effective wiring distance through the flexible FPC routing capability.
Data Source
AI summary
A narrow-bezel display module includes a display panel, a drive chip, and a flexible printed circuit board. The display panel includes a glass substrate and a TFT substrate. The glass substrate includes a bottom border. The drive chip is attached on the bottom border of the glass substrate. The drive chip includes an output end and an input end arranged opposite to each other and two side surfaces. The input end is connected to a first metal layer of the TFT substrate. The output end is connected to a second metal layer of the TFT substrate. The flexible printed circuit board includes conductive leads and a first connection portion and a second connection portion extended from one side of the conductive leads. The first connection portion and the second connection portion are connected to the input end from the two side surfaces respectively.