Liquid Crystal Display Pixel Data Line Merging
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Solution Overview
Problem
Conventional liquid crystal display devices require a large number of costly data drive ICs, leading to increased manufacturing costs due to the need for multiple data lines to supply video data to pixel cells.
Innovation Solution
The liquid crystal display device configures pixel cells such that those expressing the same colors are connected in common to the same data lines, reducing the number of data drive ICs required by half compared to conventional designs, while maintaining image quality through appropriate inversion systems like frame, line, column, and dot inversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If multiple data lines are used to supply video data to each pixel cell in conventional designs, then image quality can be maintained, but the number of data drive ICs increases leading to higher manufacturing costs
Solution Approach 1:
The patent merges the data line connections for pixel cells of the same color. Specifically, pixel cells displaying the same color (e.g., all red pixels, all green pixels, all blue pixels) are connected to the same data line, thereby reducing the total number of data lines and data drive ICs required. This combining approach maintains image quality while significantly reducing manufacturing complexity and cost.
Solution Approach 2:
Each data line is designed to serve multiple pixel cells simultaneously based on their color characteristics. A single data line can supply video data to multiple pixel cells of the same color across different locations in the display panel, making the data line multi-functional and reducing the overall number of data lines needed.
2Device complexity
If pixel cells of the same color are connected to the same data line, then the number of data drive ICs is reduced, but charging differences may cause picture quality degradation
Solution Approach 1:
The patent employs inversion systems (frame inversion, line inversion, column inversion, dot inversion) that periodically reverse the polarity of voltages applied to pixel cells. This periodic action compensates for charging differences that occur when multiple pixel cells share the same data line, preventing picture quality degradation such as image sticking or residual images while maintaining the reduced data drive IC configuration.
Data Source
AI summary
Disclosed herein is a liquid crystal display device which is capable of reducing the number of data drive integrated circuits (ICs) to curtail a production cost. The liquid crystal display device includes a plurality of pixel cells formed respectively in areas defined by a plurality of gate lines and a plurality of data lines, a first unit pixel including at least three of the pixel cells, the at least three pixel cells being connected to different ones of the data lines, and a second unit pixel including at least three of the pixel cells other than the at least three pixel cells of the first unit pixel, the at least three pixel cells of the second unit pixel being connected respectively to the different data lines to which the at least three pixel cells of the first unit pixel are connected, wherein the first and second unit pixels are arranged in a direction of the data lines and connected to different ones of the gate lines. A plurality of adjacent pixel cells expressing the same colors or different colors on horizontal lines, among the pixel cells, are connected in common to the same data lines.