Liquid Crystal Display Current Duplication Module Voltage Uniformity
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Solution Overview
Problem
Conventional liquid crystal displays experience uneven brightness and inconsistent flicker contrast ratios due to voltage decay along traces, resulting in mura and image quality deterioration, as they receive common voltage from two opposite sides with different trace lengths.
Innovation Solution
A liquid crystal display incorporating a current duplication module that inputs two substantially equal currents to opposite sides of the pixel array, ensuring equal voltages are applied across both sides, thereby eliminating IR drops caused by different trace lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common voltage is input from one side of the pixel array, then the trace length is short and结构简单, but voltage decay causes uneven common voltage across pixels resulting in poor image quality
Solution Approach 1:
The patent divides the single common voltage input path into two separate input paths from opposite sides of the pixel array. This segmentation allows the common voltage to be supplied through multiple shorter traces instead of one long trace, reducing voltage decay and improving voltage uniformity across the display panel.
Solution Approach 2:
The patent transitions from a single-sided common voltage input (one-dimensional approach) to a dual-sided input approach (adding spatial dimension). By inputting common voltage from both upper and lower sides simultaneously, the system achieves better voltage distribution without significantly increasing trace length or complexity.
2Manufacturing precision
If common voltage is input from two opposite sides of the pixel array, then voltage decay is reduced, but different trace lengths cause unequal common voltages resulting in uneven brightness and mura
Solution Approach 1:
The patent introduces asymmetric compensation through the current duplication module. When trace lengths are unequal, the module actively adjusts the common voltage levels on each side to compensate for the difference, ensuring that the effective common voltage experienced by pixels on both sides is equal, thus preventing brightness unevenness and mura.
Solution Approach 2:
The current duplication module implements a feedback mechanism that monitors and adjusts common voltage distribution. By detecting voltage differences caused by unequal trace lengths and dynamically compensating through current adjustment, the system maintains uniform common voltage across the pixel array despite asymmetric trace configurations.
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 prevents uneven brightness and significantly reduces inconsistent flicker contrast ratios, achieving consistent image quality by ensuring equal voltage distribution across the pixel array.
Implementation Method 1
The current duplication module is used to input two substantially equal currents to the first side and the second side of the pixel array, respectively, to provide the common voltage to the first side and the second side of the pixel array
Data Source
AI summary
A liquid crystal display includes a pixel array, a gate driver, a data driver, a common voltage source, and a current duplication module. The gate driver is used to turn on a plurality of rows of pixels in the pixel array in sequence. The data driver is used to provide a plurality of data voltages to the turned-on pixels in the pixel array. The common voltage source is used to provide a common voltage. The current duplication module is coupled to a first side and a second side of the pixel array and is used to input two substantially equal currents to the first side and the second side of the pixel array respectively to provide the common voltage to the first side and the second side of the pixel array.