Liquid Crystal Display Counter Electrode Drive Circuit Segmentation
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Solution Overview
Problem
In liquid crystal display devices with a drive circuit arranged on both sides of the display region in a two-split manner, flickering occurs at the screen edges due to uneven voltage distribution and parasitic capacitance effects, leading to brightness variations and image quality issues.
Innovation Solution
The liquid crystal display device employs a configuration where counter electrode signal lines are connected to alternating drive circuits, applying different voltages to adjacent lines in a specific pattern during each frame period to ensure uniform voltage distribution and reduce flickering, with four adjacent lines arranged in varying states to minimize brightness deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a drive circuit is arranged on one side of the display region, then the device complexity is reduced, but the brightness uniformity deteriorates due to uneven voltage distribution across the display region
Solution Approach 1:
The drive circuit is divided into two separate drive circuits arranged on opposite sides of the display region. Each drive circuit controls a portion of the counter electrode signal lines, with odd-numbered lines connected to one drive circuit and even-numbered lines connected to the other drive circuit. This segmentation enables more uniform voltage distribution across the entire display region while maintaining manageable circuit complexity.
2Device complexity
If counter electrode signal lines are connected to a single drive circuit, then the device complexity is reduced, but flickering occurs at screen edges due to parasitic capacitance effects
Solution Approach 1:
The counter electrode signal lines are segmented and alternately connected to different drive circuits. Odd-numbered signal lines are connected to a first drive circuit while even-numbered signal lines are connected to a second drive circuit. This alternating connection pattern distributes the parasitic capacitance effects more evenly across the display region, preventing concentrated flickering at screen edges and improving overall image quality stability.
3Productivity
If the display region is expanded, then the productivity is improved, but the voltage distribution becomes more uneven leading to increased brightness deviations
Solution Approach 1:
The display region is effectively segmented into two zones by assigning odd-numbered counter electrode signal lines to one drive circuit and even-numbered lines to another drive circuit. This segmentation allows each drive circuit to manage a portion of the expanded display region, maintaining more uniform voltage distribution across the larger area and reducing brightness deviations that would otherwise occur in a uniformly expanded display.
Solution Approach 2:
The problem of voltage distribution in a large display region is solved by introducing a new dimension of control - alternating connection patterns across the signal line dimension. Instead of simply expanding the display region uniformly, the patent uses the signal line numbering dimension to create an alternating connection scheme that distributes voltage application more evenly across the expanded display area, thereby maintaining brightness uniformity.
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 reduces flickering at the display edges and achieves more uniform brightness distribution, enhancing image quality by eliminating differences between odd and even-numbered frames and minimizing brightness deviations within the display region.
Implementation Method 1
By applying a voltage between the pixel electrodes and counter electrodes, the alignment direction of liquid crystal is changed. In this manner, by allowing the pixel electrodes and the counter electrodes to function as optical switching elements, an image is formed.
Implementation Method 2
a plurality of counter electrode signal lines which are made conductive with the counter electrode portions
Data Source
AI summary
In a liquid crystal display device which arranges a drive circuit on left and right sides of a display region in a two-split manner, flickering at an edge of a screen can be reduced. In a liquid crystal display device which arranges first and second counter electrode drive circuits on left and right sides of a display region respectively, during an arbitrary 1 frame period, a first counter electrode signal drive circuit 3L applies a first voltage to at least one counter electrode signal line portion CX1, CX3, . . . CXn−1 and a second voltage different from the first voltage to at least one counter electrode signal line portion CX1, CX3, . . . CXn−1, and a second counter electrode signal drive circuit 3R applies the first voltage to at least one counter electrode signal line portion CX2, CX4, . . . CXn and the second voltage to at least one counter electrode signal line portion CX2, CX4, . . . CXn.