Trench Capacitor for High-Luminance Liquid Crystal Displays
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Solution Overview
Problem
Existing liquid crystal devices face challenges in maintaining high luminance and aperture ratio due to increased light leakage and reduced capacitance when trying to narrow pixel pitch, which prevents them from corresponding to smaller sizes and higher luminance requirements.
Innovation Solution
The implementation of a trench-type capacitor configuration within a groove on the substrate, which includes a first electrode, a first insulation film, a second electrode, and a third electrode laminated in order, allows for increased capacitance without expanding the planar area, and is positioned to shield light leakage from transistors and semiconductor layers, improving light-shielding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If capacitance of the capacitative element is increased in the planar direction of pixels, then display quality is maintained under high luminance conditions, but aperture ratio drops and pixel pitch cannot be narrowed
Solution Approach 1:
The patent transitions from planar capacitor configuration to a three-dimensional structure by forming capacitors within grooves etched into the substrate. This vertical arrangement allows capacitance to be increased by utilizing the depth dimension of the groove rather than expanding in the planar direction, thereby maintaining aperture ratio while achieving the required capacitance for high luminance display quality
Solution Approach 2:
The capacitor structure is nested within the groove formed in the substrate, with multiple layers of electrodes and insulating films arranged vertically within the confined groove space. This nesting approach maximizes capacitance within a minimal planar footprint, allowing pixel pitch to be narrowed without sacrificing the capacitance needed for display quality
2Area of stationary object
If pixel pitch is narrowed to reduce device size, then compactness is improved, but capacitance is reduced and light leakage increases
Solution Approach 1:
By forming capacitors vertically within grooves, the patent achieves high capacitance values within a reduced planar area. The groove depth provides additional capacitive volume without increasing the pixel's footprint, enabling pixel pitch narrowing while maintaining sufficient capacitance to counteract light leakage in compact devices
Solution Approach 2:
The capacitor structure employs composite materials including conductive films, high-k insulating films, and protective films arranged in multiple layers within the groove. This composite structure maximizes capacitance density within the constrained groove volume, enabling high capacitance in narrow pixel pitch configurations
3Illumination intensity
If high luminance is achieved, then brightness is improved, but light leakage of transistor increases
Solution Approach 1:
The patent extracts the capacitative function from the planar pixel structure and relocates it into vertically etched grooves. This separation allows the capacitor to be positioned where it can effectively shield the transistor region from light leakage while maintaining the high luminance display area, thus extracting the harmful light leakage effect from the active display region
Solution Approach 2:
The groove structure, initially created as a means to increase capacitance, inadvertently provides light-shielding benefits by physically blocking light paths to the transistor. The patent converts the potential harm of light leakage into a benefit by using the groove walls as natural light shields, protecting the transistor while maintaining high luminance in the display region
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 pixel pitch, improved brightness, and enhanced light-shielding, allowing for smaller, high-luminance liquid crystal devices with maintained or improved aperture ratios.
Implementation Method 1
a capacitor which is formed inside the groove and includes a first electrode, a first insulation film, a second electrode, a second insulation film, and a third electrode which are laminated in order of mention
Implementation Method 2
an insulation layer which is provided above the substrate... a first insulation film, a second insulation film
Data Source
AI summary
An electro-optical apparatus includes a first substrate, an interlayer insulation layer which is provided on the first substrate, and a groove which is provided on the interlayer insulation layer, in which a plurality of capacitors (a first capacitative element and a second capacitative element) which are laminated in order of a lower electrode, a lower dielectric film, an relay electrode, an upper dielectric film, and an upper electrode are formed inside the groove.