Display Panel Metal Pad Protrusion for Contrast Enhancement
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels face challenges in achieving high contrast ratios due to high transmittance in the dark state, which affects display quality.
Innovation Solution
A display panel design featuring a first substrate with pixel units, a liquid crystal layer, and metal pads with protrusion patterns that create dark line patterns when light passes through, reducing transmittance in the dark state and enhancing contrast by adjusting deviation distances and metal pad patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional LCD panel structure is used, then manufacturing simplicity is maintained, but transmittance in dark state is high resulting in low contrast ratio
Solution Approach 1:
The invention segments the pixel structure by introducing metal pads with protrusion portions into the pixel units. These metal pads are divided into multiple regions (first region, second region, third region) with different functions, creating distinct segments that collectively reduce dark state transmittance while maintaining manufacturability through standardized segmentation patterns
Solution Approach 2:
The invention introduces a new dimensional element by adding protrusion portions to the metal pads that extend into the pixel unit area. This dimensional change creates dark line patterns that reduce transmittance without requiring complex multi-layer structures, thus maintaining ease of manufacture while improving contrast ratio
2Illumination intensity
If metal pads with protrusion portions are added to pixel units, then dark line patterns are created reducing transmittance and increasing contrast ratio, but device structure becomes more complex
Solution Approach 1:
The invention merges the metal pad structure with the pixel unit boundary structure. The metal pads are positioned such that their protrusion portions align with and integrate into the pixel unit divisions, creating dark line patterns that serve both as structural elements and as optical control features, thereby reducing overall device complexity
Solution Approach 2:
The metal pads serve multiple functions: they provide electrical connections, define pixel unit boundaries, create dark line patterns for contrast enhancement, and contribute to color filtering. This multi-functionality reduces the need for separate structures, thereby reducing device complexity while achieving the desired contrast ratio improvement
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 design effectively decreases brightness in the dark state, thereby increasing the contrast ratio and allowing for color modification, thereby improving display performance and quality.
Implementation Method 1
a liquid crystal layer is disposed between two electrodes, and voltage is applied onto the electrodes to control the tilt of liquid crystal molecules. Thus, it is possible to control light from a backlight module disposed below the LCD panel to pass or not pass through the liquid crystal layer
Implementation Method 2
a first photo-alignment layer disposed on the pixel units and having at least two different alignment directions corresponding to one sub-pixel units
Data Source
AI summary
A display panel is disclosed, which comprises: a first substrate with plural sub-pixel units disposed thereon; a first photo-alignment layer disposed on the first substrate and having at least two different alignment directions corresponding to one sub-pixel unit; and plural metal pads respectively corresponding to the sub-pixel units. When light passes through each sub-pixel, a dark line pattern is exhibited, comprising: a first main dark line disposed at an interface between two different alignment directions of the first photo-alignment layer; and a metal pad pattern corresponding to the metal pad and the first main dark line. Herein, a distance difference between an edge of the first dark line and an edge of the metal pad pattern at the same side is not identical to that between another edge of the first dark line and another edge of the metal pad pattern at another same side.