Display Device Spacer Arrangement for Light Leakage Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices, such as liquid crystal displays, face challenges in maintaining stable threshold voltage and reliability due to issues with spacer formation and light leakage between pixels.
Innovation Solution
The implementation of a display device design that includes a specific arrangement of color filters and spacers, where main spacers and sub-spacers are positioned to overlap selected portions of color filters, thereby stabilizing the spacer formation and reducing light leakage, which helps in maintaining the threshold voltage and improving the device's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spacers are formed without overlapping color filters, then the manufacturing process is simpler, but the spacer formation becomes unstable and light leakage occurs between pixels
Solution Approach 1:
The spacer structure is divided into two distinct types: main spacers that overlap with color filters to ensure stable formation, and sub-spacers that do not overlap with color filters to prevent light leakage. This segmentation allows each type of spacer to serve its specific function optimally, resolving the contradiction between formation stability and light leakage prevention.
Solution Approach 2:
Different regions of the display device are assigned different spacer types based on local requirements. Main spacers are positioned in regions where formation stability is critical (overlapping color filters), while sub-spacers are positioned in regions where light leakage prevention is critical (non-overlapping with color filters). This local differentiation resolves the contradiction by applying the appropriate spacer type to each specific location.
2Reliability
If main spacers overlap color filters, then spacer formation is stabilized, but light leakage between pixels increases
Solution Approach 1:
The spacer system is segmented into main spacers and sub-spacers with distinct positioning strategies. Main spacers overlap color filters to ensure formation stability, while sub-spacers are specifically positioned to avoid color filter overlap, thereby preventing light leakage. This segmentation resolves the contradiction by distributing different spacer types to different functional roles.
Solution Approach 2:
The sub-spacers act as intermediary elements that fill the gaps between main spacers without overlapping color filters. They provide additional mechanical support and spacing stability while maintaining optical isolation between pixels, thus mediating between the need for formation stability and light leakage prevention.
3Reliability
If sub-spacers are positioned to overlap transistors, then spacer formation is enhanced, but transistor performance may be affected
Solution Approach 1:
Sub-spacers are strategically positioned to overlap transistor regions where they can provide formation support without interfering with critical transistor structures. The positioning is optimized locally to balance the need for spacer stability with the requirement to maintain transistor performance, applying the spacer structure only where it provides benefit without causing harm.
Data Source
AI summary
A display device according to an exemplary embodiment includes: a plurality of transistors disposed on a substrate; a plurality of pixel electrodes electrically connected to the plurality of transistors; a plurality of first color filters, a plurality of second color filters, and a plurality of third color filters disposed between the plurality of transistors and the plurality of pixel electrodes; and a plurality of main spacers and a plurality of sub-spacers disposed on the pixel electrode, wherein the plurality of main spacers and the plurality of sub-spacers are disposed to overlap selected portions of the plurality of first color filters in a plan view, respectively, and not to overlap the plurality of second color filters and the plurality of third color filters in a plan view.