Organic Layer Coplanar Surface for Display Reliability
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Solution Overview
Problem
Current display devices face reliability issues due to uneven liquid crystal layer alignment and light leakage caused by the step formed between the color filter and the organic layer, which affects image quality.
Innovation Solution
A display device structure is developed with an organic layer that covers the light blocking area and has a coplanar surface with the pixel electrode, reducing the step and ensuring even liquid crystal alignment, thereby preventing light leakage and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display device structure is used with a color filter and organic layer, then the device can be manufactured, but a step is formed between the color filter and organic layer causing uneven liquid crystal alignment and light leakage
Solution Approach 1:
The patent extends the organic layer into the light blocking area (a different spatial dimension/region) to cover the step formation area. This dimensional extension allows the organic layer to compensate for the height difference created by the color filter, enabling uniform liquid crystal alignment across the entire pixel electrode surface including areas adjacent to the color filter.
Solution Approach 2:
The organic layer acts as an intermediary substance that fills and covers the step formation area between the color filter and pixel electrode. By positioning the organic layer to overlap both the light transmitting area and light blocking area, it provides a continuous, uniform surface for liquid crystal alignment, mediating the interface between the color filter structure and the liquid crystal layer.
2Ease of manufacture
If the organic layer is positioned only over the light transmitting area, then manufacturing is simplified, but light leakage occurs due to the step between color filter and organic layer
Solution Approach 1:
The organic layer is positioned to extend into the light blocking area (a different spatial region) beyond the conventional light transmitting area boundary. This dimensional extension ensures that the organic layer covers the step formation area where the color filter meets the pixel electrode, preventing light leakage paths while maintaining manufacturing feasibility through a single continuous layer deposition process.
3Device complexity
If the organic layer does not cover the light blocking area, then the manufacturing process is simpler, but liquid crystal alignment becomes uneven affecting image quality
Solution Approach 1:
The organic layer coverage is extended into the light blocking area (spatial dimension extension) to provide continuous alignment guidance for liquid crystal molecules across the entire pixel electrode surface. This extended coverage, while increasing device complexity slightly, ensures uniform liquid crystal alignment by eliminating the step edge effect that would otherwise create alignment defects at the color filter boundary.
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 proposed structure enhances the reliability of display devices by ensuring even liquid crystal alignment and reducing light leakage, resulting in improved image quality and display performance.
Implementation Method 1
An upper surface of the organic layer is substantially coplanar with an upper surface of the first pixel electrode
Data Source
AI summary
A display device includes: a semiconductor layer including source (SR), drain (DR), and channel (CR) regions; a first insulating layer (FIL) on the semiconductor layer; a gate line on the FIL and overlapping the CR; a second insulating layer (SIL) on the gate line; a first contact hole (FCH) in the FIL and the SIL, and exposing the SR; a data line on the SIL and contacting the SR; a third insulating layer (TIL) on the data line; a second contact hole (SCH) in the first to third insulating layers and exposing the DR; a drain electrode on the TIL and contacting the DR; a color filter on the TIL and not overlapping the SCH; a pixel electrode (PE) on the color filter and contacting the drain electrode; and an organic layer on the TIL and the PE. Upper surfaces of the organic layer and the PE are substantially coplanar.