Liquid Crystal Display Subpixel Voltage Control via Capacitor Mediator
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Solution Overview
Problem
In vertical alignment mode liquid crystal displays, controlling the voltage of subpixel electrodes is challenging due to the presence of a semiconductor layer under the data conductor, leading to non-uniform capacitance and difficulty in maintaining side visibility equivalent to front visibility.
Innovation Solution
The liquid crystal display incorporates a structure with multiple thin film transistors, capacitance electrode lines overlapping gate lines, and voltage transmitting lines, along with a passivation layer and contact holes, to precisely control the voltage of subpixel electrodes, ensuring uniform capacitance and equivalent side and front visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a semiconductor layer is disposed under the data conductor to control subpixel voltages, then voltage control capability is improved, but capacitance uniformity deteriorates
Solution Approach 1:
The patent introduces a capacitor structure with a first electrode connected to the data conductor and a second electrode disposed at a different position. This capacitor acts as an intermediary element that compensates for the non-uniform capacitance caused by the semiconductor layer, enabling uniform voltage control across different subpixels while maintaining the semiconductor layer's voltage control function.
Solution Approach 2:
The patent adjusts the capacitance parameters by configuring the capacitor's electrode positions and dimensions. By changing the capacitance value through structural parameters (electrode area, distance between electrodes), the system compensates for the non-uniformity introduced by the semiconductor layer, achieving uniform voltage distribution.
2Illumination intensity
If different voltages are applied to two subpixels to achieve side visibility equivalence, then viewing angle performance is improved, but voltage control precision deteriorates
Solution Approach 1:
The capacitor serves as a mediator that compensates for the non-uniform capacitance effects, enabling precise voltage control. By introducing this intermediate compensating element, the system can accurately apply different voltages to different subpixels to achieve side visibility equivalence without the voltage control precision deteriorating.
3Ease of manufacture
If a simple transistor structure is used to reduce device complexity, then manufacturing ease is improved, but voltage control precision deteriorates
Solution Approach 1:
The patent segments the voltage control function by introducing a dedicated capacitor structure separate from the transistor. This segmentation allows the transistor to handle basic switching while the capacitor provides precise voltage control and compensation, achieving high precision without significantly increasing overall device complexity.
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 allows for precise voltage control of subpixel electrodes, achieving substantial equivalence in side and front visibility, thereby enhancing the display's performance and image quality.
Implementation Method 1
voltages are applied to the electric field generating electrode to generate an electric field in the liquid crystal layer. Due to the generated electric field, liquid crystal molecules of the liquid crystal layer align and a polarization of incident light is controlled
Implementation Method 2
liquid crystal molecules of the liquid crystal layer align and a polarization of incident light is controlled, thereby an displaying image
Implementation Method 3
a capacitor having a first electrode electrically connected to the data conductor and a second electrode disposed at a different position from the first electrode
Data Source
AI summary
A liquid crystal display includes a plurality of pixels arranged in a matrix, the pixels including a plurality of pixel electrodes each including a first subpixel electrode and a second subpixel electrode; a plurality of first thin film transistors electrically connected to the first subpixel electrodes; a plurality of second thin film transistors electrically connected to the second subpixel electrodes; a plurality of third thin film transistors electrically connected to the second subpixel electrodes; a plurality of first gate lines electrically connected to the first and second thin film transistors; a plurality of data lines electrically connected to the first and second thin film transistors; a plurality of the second gate lines electrically connected to the third thin film transistors; and a plurality of capacitance electrode lines overlapping the first and second gate lines and disposed in a same layer as a layer of the pixel electrodes, wherein drain electrodes of the third thin film transistors overlap the capacitance electrode lines.