IPS LCD Comb-Tooth Electrodes for Drive Voltage Reduction
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Solution Overview
Problem
Conventional liquid crystal display devices with IPS-drive panels face a challenge in reducing power consumption while maintaining optical transmissivity, as lowering the drive voltage leads to decreased electric field intensity and subsequent lower transmissivity, especially when pixel electrodes and counter electrodes are arranged in a stacked manner with an insulation layer.
Innovation Solution
The liquid crystal display device incorporates a configuration with first and second pixel electrodes having comb-teeth portions arranged alternately on the same layer, connected to different video signal lines, and a counter electrode formed in a rectangular shape, where the level relationship of grayscale voltage potentials between the pixel electrodes and the counter electrode is reversed, allowing for a lower drive voltage while maintaining optical transmissivity by utilizing additional electric field components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the drive voltage is lowered to reduce power consumption, then power consumption is reduced, but optical transmissivity is lowered
Solution Approach 1:
The patent introduces a second pixel electrode on the same substrate as the first pixel electrode, creating a multi-dimensional electrode arrangement. This allows electric fields to be generated in multiple directions (both lateral and vertical components), enabling effective liquid crystal switching at lower drive voltages while maintaining optical transmissivity through enhanced field distribution across the liquid crystal layer.
Solution Approach 2:
The electrode structure is segmented into multiple pixel electrodes (first and second pixel electrodes) with comb-teeth portions that are spatially separated. This segmentation creates multiple localized electric field sources that work together to drive liquid crystal molecules more effectively at lower voltages, resolving the contradiction between power consumption and optical performance.
2Use of energy by stationary object
If the drive voltage is lowered, then power consumption is reduced, but electric field intensity is lowered
Solution Approach 1:
The patent combines the electric field generation capabilities of multiple pixel electrodes (first and second pixel electrodes) to work synergistically. By merging their field contributions, the system achieves enhanced overall electric field intensity even at lower drive voltages, as the combined effect of multiple electrode pairs creates a more robust field distribution across the liquid crystal material.
Solution Approach 2:
The multi-electrode arrangement creates electric fields in additional spatial dimensions beyond the traditional single-plane configuration. The comb-teeth portions extend in specific directions to generate both lateral and vertical field components, effectively increasing the overall field intensity and improving liquid crystal switching efficiency at reduced voltages.
3Device complexity
If pixel electrodes and counter electrodes are arranged in a stacked manner with insulation layer, then device structure is compact, but optical transmissivity is lowered when drive voltage is reduced
Solution Approach 1:
The stacked electrode structure is further segmented by introducing multiple pixel electrodes (first and second) on the same substrate layer. This segmentation creates multiple electric field generation points that compensate for the field intensity reduction when drive voltage is lowered, maintaining optical transmissivity while preserving the compact stacked arrangement.
Solution Approach 2:
The patent applies local quality enhancement by positioning comb-teeth portions of multiple pixel electrodes at specific locations and orientations. This localized optimization creates enhanced electric field regions that specifically target the liquid crystal material in critical areas, maintaining effective switching and optical performance even in the compact stacked configuration.
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 enables a reduction in drive voltage while maintaining or even improving optical transmissivity compared to conventional IPS-type liquid crystal display panels, by effectively utilizing electric fields across a broader area of the liquid crystal material.
Implementation Method 1
Lines of force of an electric field (that is, lines of electric force) which are generated due to a potential difference between the pixel electrode and the counter electrode pass through the liquid crystal material
Implementation Method 2
liquid crystal material which is sealed between the first substrate and the second substrate
Data Source
AI summary
In a liquid crystal display device where pixel electrodes and counter electrodes are arranged on one substrate in a stacked manner by way of an insulation layer, it is possible to lower a drive voltage while maintaining optical transmissivity. Pixels each of which includes a first pixel electrode, a second pixel electrode and a counter electrode are arranged on a substrate in a matrix array. A first pixel electrode and a second pixel electrode in one pixel include a plurality of comb-teeth portions respectively. The first pixel electrode and the second pixel electrode are alternately arranged on the same layer in an opposed manner with a gap defined between the comb-teeth portion of the first pixel electrode and the comb-teeth portion of the second pixel electrode. The first and second pixel electrodes and the counter electrode are arranged in a stacked manner with an insulation layer sandwiched therebetween.