Cross-Shaped Spacer Arrangement for RGBW Display Transmittance
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Solution Overview
Problem
In liquid crystal display devices, improving white luminance without increasing power consumption is challenging, as enhancing backlight luminance increases power consumption, and existing methods to improve liquid crystal transmittance are limited.
Innovation Solution
The arrangement of spacers in a cross-shape column configuration between sub-pixels in an RGBW display device, where a first spacer is aligned with signal lines and a second spacer is aligned with scanning lines, to maintain spacing and reduce the risk of film or element damage, while allowing for stable column density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance of a backlight is increased to improve white luminance, then the white luminance is enhanced, but the power consumption increases
Solution Approach 1:
The backlight unit is segmented into multiple light sources including blue, green, red, and white LEDs arranged in a specific pattern. This segmentation allows selective activation of light sources based on pixel requirements, enabling white luminance enhancement without proportionally increasing overall power consumption by only activating necessary light sources
Solution Approach 2:
Different regions of the display utilize different combinations of light sources based on local requirements. White sub-pixels use white light sources while colored sub-pixels use corresponding colored light sources, optimizing power consumption by activating only the necessary light sources in each local region rather than illuminating the entire display at maximum brightness
2Illumination intensity
If the transmittance of liquid crystal is improved to enhance white luminance, then the white luminance increases, but the reliability of the liquid crystal layer decreases due to increased risk of film or element damage
Solution Approach 1:
Spacer structures are pre-formed at specific positions between sub-pixels before the liquid crystal layer is assembled. These spacers maintain appropriate spacing and prevent excessive compression or contact between the array substrate and opposite substrate, thereby protecting the liquid crystal layer and preventing film damage before operational stress occurs
Solution Approach 2:
Spacer structures serve as intermediary elements between the array substrate and opposite substrate. These spacers distribute mechanical stress evenly and prevent direct contact between potentially damaging surfaces, thereby protecting the liquid crystal layer while still allowing sufficient light transmission to maintain high white luminance
3Stability of the object's composition
If spacers are arranged densely to maintain stable column density, then the column density stability improves, but the manufacturing precision requirements increase due to complex spacer arrangement
Solution Approach 1:
The spacer arrangement follows an asymmetric pattern where spacers are positioned at specific locations between certain sub-pixels rather than uniformly across all sub-pixels. This asymmetric arrangement achieves stable column density while reducing the number of spacer positions that require precise manufacturing, thereby lowering overall manufacturing precision requirements
Solution Approach 2:
Instead of placing spacers between all adjacent sub-pixels, spacers are strategically placed only at critical positions where column density stability is most needed. This partial action approach achieves sufficient column density stability while significantly reducing the manufacturing precision requirements compared to a complete spacer arrangement
Data Source
AI summary
A display device includes a first light shielding area where two signal lines are arranged between the opening portions of mutually adjacent sub pixels, a second light shielding area where one signal line is arranged between the opening portions of mutually adjacent sub pixels, and a third light shielding area where one scanning line is arranged between the opening portions of mutually adjacent sub pixels. The display device further includes a first spacer arranged in the first light shielding area or the second light shielding area along the extending direction of the signal line and a second spacer arranged in the third light shielding area along the extending direction of the scanning line. The first spacer and the second spacer are arranged crosswise.