Liquid Crystal Display Pixel Transistor Placement for Frame Downsizing
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving a sufficient aperture ratio while minimizing the size of the frame region, particularly in wearable devices like wristwatches, due to the presence of pixel transistors and drive circuits within the display region, which increases the frame width and hinders downsizing efforts.
Innovation Solution
The liquid crystal display device is designed with pixel transistors positioned outside the display region, connected via pixel wiring lines, and the drive circuit is placed in a region other than between the input pad group and the display region, allowing for a more compact frame configuration by optimizing the placement of these components on the panel substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If pixel transistors and memory circuits are provided in the display region, then power consumption can be reduced and integration can be improved, but the aperture ratio becomes insufficient
Solution Approach 1:
The patent extracts pixel transistors and memory circuits from the display region and relocates them to the frame region. This separation allows the display region to be dedicated solely to pixel electrodes, maximizing the aperture ratio, while the frame region houses the control circuits, achieving integration without compromising display area.
2Ease of operation
If drive circuits are provided between the input pad group and the display region, then signal transmission can be optimized, but the frame region size increases
Solution Approach 1:
The patent redistributes drive circuits along the lateral edges of the display region rather than concentrating them in the vertical space between the input pad group and display region. This lateral arrangement utilizes the frame region's perimeter space, optimizing signal transmission pathways while minimizing the vertical frame height.
3Area of stationary object
If the frame region is reduced for downsizing wearable devices, then device portability is improved, but the placement of pixel transistors and drive circuits becomes more constrained
Solution Approach 1:
The patent segments the frame region into multiple functional zones: one zone for pixel transistors, another for memory circuits, and additional areas for drive circuits. This segmentation allows each component type to be optimally positioned within the constrained frame region, facilitating compact layout while maintaining functional independence and simplifying the overall placement strategy.
Data Source
AI summary
A plurality of pixel electrodes are provided in a display region. A plurality of pixel transistors corresponding to the plurality of pixel electrodes in a one-to-one manner are provided in a region outside the display region. Each of the pixel transistors is connected to the corresponding pixel electrode by a pixel wiring line. An input pad group, to which a drive signal group for driving the plurality of pixel transistors is input, is provided on a TFT substrate. Here, of a region on the TFT substrate, the plurality of pixel transistors are provided only in a region other than a region between the input pad group and the display region.