LCD Data Driver Charge Sharing Segmentation
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Solution Overview
Problem
In liquid crystal display (LCD) devices, irregular charge sharing between data lines causes vertical line defects due to differences in charge share levels between the first and last data lines compared to those in the middle, leading to suboptimal display performance.
Innovation Solution
A data driving apparatus with output switches, charge sharing lines, and switches that connect data lines to share charges between amplifiers, ensuring equal charge distribution across all data lines, including the first and last channels, through a control signal-driven mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If data lines are shorted for charge sharing, then charge distribution is improved, but uniformity of charge sharing across all data lines deteriorates
Solution Approach 1:
The data lines are divided into multiple groups, with each group having its own dedicated charge sharing line. This segmentation allows each group to perform charge sharing independently, ensuring uniform charge distribution within each group while avoiding the interference that causes non-uniformity in a single shared line system.
Solution Approach 2:
Charge sharing lines are introduced as intermediary elements between the data lines. These intermediary lines facilitate the charge sharing process by providing a dedicated pathway for charge transfer, thereby improving charge distribution uniformity across all data lines without direct shorting between them.
2Reliability
If first and last data lines share charge with adjacent lines, then charge sharing is achieved, but charge share level becomes different from middle data lines
Solution Approach 1:
Data lines are segmented into groups, with first and last data lines grouped with adjacent lines rather than sharing charge across the entire array. This segmentation ensures that boundary data lines have the same number of sharing partners as middle data lines, achieving consistent charge share levels across all lines.
Solution Approach 2:
Different groups of data lines are assigned different charge sharing characteristics based on their positions. By optimizing the charge sharing configuration locally for each group, the system achieves uniform charge distribution globally, ensuring that first, middle, and last data lines all achieve the same charge share level.
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 solution eliminates the vertical line defect by ensuring uniform charge sharing across all data lines, improving the display performance and consistency of the LCD device.
Implementation Method 1
a charge sharing line sharing electric charges of the first and second data lines
Data Source
AI summary
A liquid crystal display having data driving apparatus comprising first and second output switches, a charge sharing line, and first and second charge sharing switches. The first output switch switches an electrical connection between a first amplifier providing a positive gradation voltage and a first data line in response to a control signal. The second output switch switches an electrical connection between a second amplifier providing a negative gradation voltage and a second data line in response to the control signal. The first charge sharing switch switches an electrical connection between the first data line and the charge sharing line in response to the control signal. The second charge sharing switch switches an electrical connection between the second data line and the charge sharing line in response to the control signal.