Display Apparatus with Blue Light Blocking and Color Conversion Patterns
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Solution Overview
Problem
Display apparatuses using photoluminescence devices face issues with reduced transmittance due to insulating film structures, which affect the display quality and luminous efficiency.
Innovation Solution
A display apparatus design that includes a backlight unit emitting blue light, with specific layer configurations such as inorganic insulation layers, blue light blocking patterns, and shielding electrodes to minimize transmittance loss and prevent parasitic capacitance and light leakage, while using quantum dots and phosphors for color conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating film structures are used in the display apparatus, then electrical insulation and device functionality are improved, but transmittance is reduced
Solution Approach 1:
The patent applies different material properties to different regions: inorganic insulation layers with high transmittance are used in light path areas, while organic insulation layers are used in non-light path areas. This local differentiation allows electrical insulation to be maintained where needed while maximizing transmittance in light transmission regions.
Solution Approach 2:
The patent employs a composite insulation structure combining inorganic and organic insulation layers. The inorganic layer (e.g., SiO2, Si3N4) provides high transmittance and electrical insulation, while the organic layer provides additional insulation and structural support. This composite approach balances both transmittance and insulation requirements.
2Reliability
If blue light blocking patterns are added to prevent light leakage, then display quality is improved, but device complexity increases
Solution Approach 1:
The patent combines the blue light blocking pattern formation with the existing data pattern formation process. The same photolithography and etching steps used to create data lines are also used to create blue light blocking patterns, merging two functions into a single process sequence and reducing overall device complexity.
Solution Approach 2:
The inorganic insulation layers serve multiple functions simultaneously: they provide electrical insulation for the thin film transistor, act as a base for data and gate patterns, and serve as a platform for blue light blocking patterns. This multi-functionality reduces the need for additional dedicated layers.
3Reliability
If shielding electrodes are disposed to overlap data lines, then parasitic capacitance is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The shielding electrodes are positioned and connected to ground potential in advance, before the data lines are fully operational. This preliminary grounding action ensures that parasitic capacitance effects are minimized from the outset, reducing the need for high-precision alignment during subsequent manufacturing steps.
Solution Approach 2:
The inorganic insulation layer acts as an intermediary between the shielding electrode and the data line. This intermediate layer provides both electrical insulation and a controlled spacing mechanism, reducing direct capacitive coupling while maintaining manageable alignment tolerances.
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
The solution enhances transmittance and display quality by minimizing light loss and improving thin film transistor characteristics, allowing for better control of the liquid crystal layer and secure pressing gaps without additional spacers.
Implementation Method 1
a color conversion pattern overlapping the pixel electrode, and comprising a quantum dot and/or phosphor
Data Source
AI summary
A display apparatus includes a light unit to emit blue light, a first base substrate disposed on the light unit, a gate pattern disposed on the first base substrate and including a gate electrode, a first inorganic insulation layer disposed on the gate pattern, a data pattern disposed on the first inorganic insulation layer and including a drain electrode, a light blocking pattern disposed on the first inorganic insulation layer, a second inorganic insulation layer disposed on the data pattern and the first inorganic insulation layer, a pixel electrode disposed on the second inorganic insulation layer, and electrically connected to the drain electrode, a color conversion pattern overlapping the pixel electrode and including a quantum dot or phosphor, and a thin film transistor disposed on the first base substrate, wherein the light blocking pattern overlaps the thin film transistor, and the light blocking pattern is disposed on the first base substrate.