Transparent Electrode Stacking for LCD Auxiliary Capacitance
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Solution Overview
Problem
As liquid crystal display devices become more high-definitive, the area ratio of comb-like pixel electrodes decreases, leading to insufficient auxiliary capacitance, which can result in lower transmittance and increased manufacturing costs when attempting to enhance capacitance.
Innovation Solution
The addition of another transparent electrode and insulation film allows for the formation of two transparent auxiliary capacitances, with a two-layered transparent conductive film gate electrode, using ion-implantation doping and etching processes, to increase capacitance independently of the pixel electrode area ratio, thereby maintaining electric potential and reducing manufacturing burdens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display is made more high-definitive, then the resolution is improved, but the area ratio of pixel electrodes becomes smaller and auxiliary capacitance becomes short
Solution Approach 1:
The patent introduces a new spatial dimension by adding another transparent electrode and insulation film layer, creating a second auxiliary capacitance in the vertical stacking direction. This multi-layer capacitance structure compensates for the reduced planar area ratio of pixel electrodes in high-definition displays, effectively increasing total auxiliary capacitance without sacrificing resolution.
Solution Approach 2:
The patent embeds additional capacitance structures within the existing display layer stack. By nesting another transparent electrode and insulation film between existing layers, the design creates compact auxiliary capacitance that integrates seamlessly into the display structure, maximizing capacitance within limited spatial constraints.
2Quantity of substance
If the area ratio of pixel electrodes is increased to improve auxiliary capacitance, then auxiliary capacitance is improved, but transmittance decreases and manufacturing cost increases
Solution Approach 1:
Instead of increasing the planar area of pixel electrodes (which would reduce transmittance), the patent transitions to a vertical dimension by stacking additional transparent electrodes and insulation films. This creates auxiliary capacitance through increased layer count rather than increased surface area, thereby maintaining high transmittance while achieving sufficient capacitance.
Solution Approach 2:
The patent employs multiple transparent conductive film layers combined with insulation films to create a composite multi-layer structure. This composite approach generates auxiliary capacitance through the series/parallel combination of multiple thin-film capacitances, achieving the required capacitance value without requiring large electrode areas that would compromise optical transmittance.
3Quantity of substance
If the area ratio of pixel electrodes is increased to improve auxiliary capacitance, then auxiliary capacitance is improved, but manufacturing cost increases
Solution Approach 1:
The patent achieves increased auxiliary capacitance by adding layers in the vertical dimension rather than expanding horizontal electrode areas. This vertical stacking approach uses standard thin-film deposition processes for each layer, which are cost-effective and scalable, avoiding the need for additional expensive materials or complex processing steps that would be required to enlarge electrode patterns.
Solution Approach 2:
The additional transparent electrode and insulation film layers serve multiple functions: they provide auxiliary capacitance, maintain optical transmittance, and integrate with the existing display manufacturing process. This multi-functionality reduces the need for separate dedicated capacitance structures, thereby lowering overall manufacturing complexity and cost.
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 effectively addresses the shortfall in auxiliary capacitance, enabling the production of high-definition, brighter LCDs with wide viewing angles at a lower cost without increasing transmittance or manufacturing complexity.
Implementation Method 1
The electric potential is held in the parallel connection of the liquid crystal capacitance LC 144 and the auxiliary capacitance Cst 146 located between the pixel electrode and the common signal electrode
Implementation Method 2
The IPS type liquid crystal display device (referred to as the IPS type LCD device) is arranged so that the comb-like pixel electrodes are located as opposed to the planar common electrodes with an insulating film laid therebetween
Data Source
AI summary
Three layers are formed on a TFT substrate SUB 100. The three layers include a first transparent electrode PSL1 131, a second transparent electrode CSL 127 and a third transparent electrode PSL2 132, all of which are laminated in parallel to the substrate surface. Two auxiliary capacitances to a liquid crystal capacitance are formed between the first transparent electrode PSL1 131 and the second transparent electrode CSL 127 and between the second transparent electrode CSL 127 and the third transparent electrode PSL2 132.