OLED Spacer Plate Blocks Blue Light Interference
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Solution Overview
Problem
In OLED display panels, the gap between the blue light-emitting layer and the color conversion material leads to light interference, resulting in a lower contrast ratio and color coordinate shifts due to uneven conversion rates and light leakage.
Innovation Solution
The introduction of spacer plates between the substrates, arranged as a matrix to block blue light interference and enhance light concentration, with reflective surfaces to direct blue light emission to specific sub-conversion units, thereby increasing the contrast ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a gap is maintained between the blue light-emitting layer and the CCM material, then the device structure is easier to manufacture, but light interference occurs and the contrast ratio deteriorates
Solution Approach 1:
The color conversion layer is divided into multiple sub-conversion units arranged in a matrix pattern, with each unit corresponding to a specific color (red, green, or blue). This segmentation allows for precise control of light conversion in each region, preventing light interference between adjacent units and improving contrast ratio while maintaining manufacturability through modular structure
Solution Approach 2:
A light-shielding layer is introduced as an intermediary component between the blue light-emitting layer and the color conversion layer. This intermediary blocks stray blue light from reaching adjacent sub-conversion units, preventing unwanted light interference and color mixing, thereby improving contrast ratio without requiring the gap to be completely eliminated
2Ease of operation
If the gap between the blue light-emitting layer and the CCM material is increased, then the device assembly is easier, but light interference becomes more serious and the contrast ratio worsens
Solution Approach 1:
By segmenting the color conversion layer into discrete sub-conversion units with light-shielding structures between them, the patent enables a larger gap between the light-emitting layer and color conversion layer. The segmentation ensures that even with increased spacing, light from one unit cannot interfere with adjacent units, thus maintaining high contrast ratio while facilitating easier assembly
Solution Approach 2:
The light-shielding layer acts as a mediator that enables the gap to be increased for easier assembly. It prevents blue light from traveling laterally across the gap to reach adjacent sub-conversion units, ensuring that the increased spacing does not compromise contrast ratio or cause color mixing
3Manufacturing precision
If the spacer plate is made with a reflective surface, then light utilization is improved and contrast ratio increases, but the device complexity increases
Solution Approach 1:
The light-shielding layer is selectively applied only in the regions between adjacent sub-conversion units, rather than covering the entire device. This local application provides the necessary light blocking function to improve contrast ratio while minimizing the addition of complex structures, maintaining simplicity in areas where it is not needed
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 spacer plates effectively block light interference and improve light utilization, resulting in a higher contrast ratio and more accurate color display by ensuring blue light emission is directed to corresponding sub-conversion units, enhancing the overall display performance.
Implementation Method 1
the spacer plate is blocked between adjacent two sub-conversion unit in order to block a blue light emits to one sub-conversion unit from entering to the other adjacent sub-conversion unit
Implementation Method 2
with reflective surfaces to direct blue light emission to specific sub-conversion units
Implementation Method 3
the blue light is a high energy light; when the blue light irradiates on the CCM material, the CCM material can emit a light having a smaller energy after absorbing the high energy light; through controlling the difference in the attenuation of the energy, a R (red) and a G (green) light are excited
Data Source
AI summary
A high contrast ratio organic light-emitting display device includes a first and a second substrate disposed oppositely, a blue light-emitting layer disposed at an inner side of the first substrate, a color conversion layer disposed at an inner side of the second substrate and multiple spacer plates disposed between the first substrate and the second substrate. Wherein the color conversion layer includes multiple sub-conversion units which are arranged as a matrix, disposed separately and capable of correspondingly generating different lights. The spacer plate blocks adjacent two sub-conversion units. The present invention utilizes the spacer plate to block interference of the blue light at sub-conversion units to increase the contrast ratio of the display device. Besides, making the spacer plate to be reflective, the blue light emitted to each sub-conversion unit is more concentrated in order to increase the contrast ratio of different sub-conversion units.