Curved LCD Pixel Electrode Segmentation for Smudge Reduction
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Solution Overview
Problem
Large-sized liquid crystal display (LCD) devices experience a significant visual difference when viewed from the center versus the sides, leading to decreased luminance and the recognition of horizontal smudge due to increased pixel area and curvature, which existing technologies fail to adequately address.
Innovation Solution
A curved display device design featuring pixel electrodes with specific subpixel electrode structures, including horizontal and vertical stem portions and minute branch portions, which divide regions with different liquid crystal molecule arrangements, ensuring each region's vertical length is less than 100 μm to prevent horizontal smudge and enhance luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the LCD size is increased, then the display area is improved, but horizontal smudge is recognized and luminance decreases
Solution Approach 1:
The pixel electrode is divided into multiple subpixel electrodes (first subpixel electrode and second subpixel electrode), and each subpixel electrode is further segmented into multiple regions by stem portions. This segmentation creates multiple regions with different liquid crystal molecule arrangements, preventing horizontal smudge while maintaining large display area and luminance
2Area of stationary object
If the pixel area is increased, then the display area is improved, but horizontal smudge is recognized
Solution Approach 1:
Each pixel electrode is segmented into multiple subpixel electrodes with multiple regions divided by stem portions. This segmentation prevents the formation of large continuous areas that cause horizontal smudge, while still maintaining large overall pixel area for high-resolution displays
Solution Approach 2:
Different regions within each subpixel electrode have different liquid crystal molecule arrangements controlled by the stem portions. This local differentiation of quality prevents horizontal smudge in specific areas while maintaining overall large pixel area
3Object-generated harmful factors
If the vertical length of each region is reduced, then horizontal smudge is prevented, but device complexity increases
Solution Approach 1:
The pixel electrode is segmented into subpixel electrodes with stem portions that create multiple regions. This segmentation reduces the vertical length of each region to prevent horizontal smudge while maintaining a relatively simple overall electrode structure compared to other approaches
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 effectively reduces horizontal smudge and maintains improved luminance in larger-sized curved LCDs by controlling the vertical length of each region, thereby enhancing side visibility and display quality.
Implementation Method 1
The LCD displays an image by generating an electric field on a liquid crystal layer by applying a voltage to the field generating electrodes, determining alignment directions of liquid crystal molecules of the liquid crystal layer through the generated field
Implementation Method 2
determining alignment directions of liquid crystal molecules of the liquid crystal layer through the generated field, and controlling polarization of incident light
Data Source
AI summary
A display device according to an exemplary embodiment of the present inventive concept includes: a first insulation substrate; a thin film transistor; a pixel electrode; a second insulation substrate; and a common electrode. The pixel electrode includes a first subpixel electrode including a first horizontal stem portion and a first vertical stem portion perpendicular thereto at one end of the first horizontal stem portion and a second subpixel electrode including a second vertical stem portion and a second horizontal stem portion perpendicular thereto at one end of the second horizontal stem portion, a plurality of regions in which arrangements of liquid crystal molecules are respectively different are divided by the first horizontal stem portion, the first vertical stem portion, the second horizontal stem portion, and the second vertical stem portion, and each of the plurality of regions has a longest vertical length of less than about 100 μm.