Liquid Crystal Device Common Electrode Voltage Control
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Solution Overview
Problem
Existing liquid crystal devices face challenges in maintaining display quality due to variations in storage capacitor characteristics, which cause voltage fluctuations in pixel electrodes, and require separate formation of pixel and storage capacitors, making it difficult to integrate them in IPS or FFS devices.
Innovation Solution
A liquid crystal device with a control circuit that alternately supplies different voltages to the common electrode, allowing positive and negative polarity image signals to be written without moving electric charges between storage and pixel capacitors, enabling integral formation of capacitors and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is changed in capacitive lines to compensate for storage capacitor variations, then pixel electrode voltage stability is improved, but device complexity increases due to separate capacitor formation requirements
Solution Approach 1:
The patent merges the pixel capacitor and storage capacitor into a single integrated capacitor structure. The first electrode serves as both the pixel electrode and one electrode of the storage capacitor, while the second electrode serves as the other electrode of the storage capacitor. This integration eliminates the need for separate capacitor formation processes and capacitive lines, resolving the contradiction between reliability improvement and device complexity.
Solution Approach 2:
The integrated capacitor structure performs multiple functions: it serves as both the pixel capacitor for image voltage storage and the storage capacitor for retaining driving voltage. By making the capacitor structure universal, the patent eliminates the need for separate storage capacitor circuits and capacitive lines, thereby reducing device complexity while maintaining display quality.
2Reliability
If separate pixel and storage capacitors are formed, then voltage compensation for storage capacitor variations is enabled, but manufacturing process complexity increases
Solution Approach 1:
The patent combines the pixel capacitor and storage capacitor into a single integrated structure formed through unified manufacturing processes. The first electrode, second electrode, and insulating layers are formed together in the same fabrication sequence, eliminating the need for separate capacitor formation processes and making the manufacturing process simpler while ensuring voltage stability.
Solution Approach 2:
The patent changes the structural parameters of the capacitor by integrating it with the pixel electrode structure. The insulating layer thickness and electrode configurations are designed to provide both pixel capacitor and storage capacitor functions simultaneously, enabling voltage stability without increasing manufacturing complexity.
3Use of energy by moving object
If voltage is alternately supplied to common electrode, then power consumption is reduced by eliminating capacitive line voltage changes, but control circuit complexity increases
Solution Approach 1:
The patent implements dynamic voltage control of the common electrode by alternately switching between first common electrode voltage and second common electrode voltage. This dynamic control enables the system to maintain display quality while reducing power consumption by eliminating the need for capacitive line voltage changes, with the control circuit managing the voltage switching based on writing timing.
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 approach maintains display quality by stabilizing pixel electrode voltages, allows for integral capacitor formation, and reduces power consumption by eliminating the need for voltage changes in capacitive lines, thus enhancing the driving voltage amplitude.
Implementation Method 1
When the driving voltage is applied to liquid crystal, the alignment or ordering of molecules of the liquid crystal changes, and accordingly, light that is transmitted through the liquid crystal and is emitted from a backlight changes
Implementation Method 2
a pixel capacitor having a pixel electrode and a common electrode, and a storage capacitor having one electrode connected to a capacitive line and the other electrode connected to a pixel electrode
Data Source
AI summary
A liquid crystal device having a first substrate, a second substrate, and liquid crystal provided between the first substrate and the second substrate includes: a plurality of scanning lines provided in the first substrate; a plurality of data lines provided in the first substrate; a plurality of switching elements provided in correspondence with intersections of the plurality of scanning lines and the plurality of data lines; a plurality of pixel electrodes connected to the plurality of switching elements; a common electrode provided in correspondence with the pixel electrodes; a control circuit that alternately supplies a first voltage and a second voltage higher than the first voltage to the common electrode; and a data line driving circuit that alternately supplies a positive-polarity image signal, of which an electric potential is higher than the first voltage, and a negative-polarity image signal, of which an electric potential is lower than the second voltage, to the plurality of data lines.