Liquid Crystal Display Drive Circuit Narrow Frame Layout
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving a narrower frame while maintaining high resolution, due to limitations in downsizing the drive circuit for scanning signal lines, particularly when using materials with low electron mobility like amorphous silicon, and increased wiring complexity with high conductivity materials.
Innovation Solution
The liquid crystal display device incorporates a scanning signal drive circuit formed on one side of the image display region, with scanning connection lines and selection circuits that selectively short-circuit scanning signal lines, using TFTs and selection signal lines to reduce the number of connections and frame width, and includes a selection canceling circuit to manage signal lines, allowing for a more efficient layout and narrower frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the drive circuit for scanning signal lines is formed in the outer region of the display device, then the frame width can be reduced to some extent, but the frame width cannot be reduced further due to material limitations with small electron mobility
Solution Approach 1:
The patent extracts the drive circuit functionality from the outer region and relocates it to the inner region of the display device. Specifically, the scanning signal line drive circuit is formed within the image display region, allowing the outer region to be minimized for narrower frame while the drive circuit operates effectively from the inner region position.
Solution Approach 2:
The patent changes the spatial dimension of drive circuit placement from the traditional outer peripheral region to the inner region of the display device. This dimensional repositioning allows the drive circuit to be embedded within the image display area, enabling further frame width reduction while maintaining circuit functionality through optimized signal routing.
2Reliability
If scanning signal lines are individually connected to an integrated circuit using wiring made of highly conductive material, then connection reliability is improved, but the number of wiring lines increases considerably, making it difficult to reduce frame width
Solution Approach 1:
The patent merges multiple scanning signal lines into a smaller number of scanning connection lines through the selection circuit. The selection circuit selectively connects multiple scanning signal lines to fewer scanning connection lines, reducing the total number of wiring lines required while maintaining reliable signal transmission through the integrated circuit.
Solution Approach 2:
The patent introduces a selection circuit as an intermediary component between the scanning signal lines and the integrated circuit. This selection circuit acts as a mediator that selectively connects scanning signal lines to scanning connection lines, reducing the number of direct connections needed while maintaining signal integrity and connection reliability.
3Manufacturing precision
If the number of pixels in the image display region is increased to achieve higher resolution, then display quality is improved, but the region for arranging wiring increases in size, making it difficult to reduce frame width
Solution Approach 1:
The patent merges multiple scanning signal lines into a reduced number of scanning connection lines through the selection circuit. This merging approach allows high-resolution displays with many pixels to be achieved while minimizing the wiring region size, as the selection circuit efficiently routes multiple signals through fewer physical connection lines to the integrated circuit.
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 configuration enables a narrower frame while maintaining high resolution by reducing the number of signal lines and connections outside the image display region, effectively utilizing materials with high conductivity and optimizing the layout of the drive circuit.
Implementation Method 1
a liquid crystal display device includes: an image display region including a plurality of pixels sectioned by a plurality of scanning signal lines and a plurality of video signal lines
Implementation Method 2
a drive circuit is configured to apply, to scanning signal lines connected to gates of thin film transistors (TFTs) formed so as to correspond to the respective pixels, signals for controlling on and off of the TFTs
Data Source
AI summary
Provided is a liquid crystal display device, including: a plurality of scanning connection lines formed on at least one side of edges of the image display region, the plurality of scanning connection lines connecting together a scanning signal drive circuit and a plurality of scanning signal lines; a selection circuit formed so as to be interposed between the plurality of scanning connection lines and the plurality of scanning signal lines, the selection circuit being configured to selectively short-circuit one of a plurality of the scanning signal lines to one of the plurality of scanning connection lines based on a selection signal; and a selection signal line connected to the selection circuit, the selection signal line transmitting the selection signal to the selection circuit.