Display Back Plate Water Vapor Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic light emitting display devices are susceptible to performance degradation due to water vapor and oxygen permeation, which affects their service life, as existing packaging methods are not entirely effective in preventing gas-generated water vapors from internal components.
Innovation Solution
A display back plate with a pixel define layer incorporating an accommodation space filled with a water absorbent material, separated from the organic light emitting units, to absorb and neutralize water vapors effectively, thereby preventing adverse chemical reactions and extending the device's service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drying agent is provided over the packaging layer to prevent water vapour permeation, then service life of organic light emitting components is prolonged, but water vapours generated from interior parts (TFT, color film) still adversely affect service life
Solution Approach 1:
The invention extracts the water absorbent material from the traditional packaging layer position and relocates it to the pixel define layer, closer to the source of water vapour generation. This allows the absorbent material to intercept and absorb water vapour before it can reach and damage the organic light emitting components, effectively addressing the harmful effect of internally generated water vapour while maintaining the protective function.
Solution Approach 2:
The pixel define layer serves as an intermediary structure that incorporates the water absorbent material. This intermediary layer positioned between the array substrate (where water vapour is generated) and the organic light emitting components effectively mediates the harmful interaction by absorbing water vapour in transit, protecting the sensitive components without requiring modification of the packaging layer.
2Reliability
If water absorbent material is placed close to organic light emitting unit for effective absorption, then water vapour protection is improved, but risk of chemical reaction between water vapour and absorbent material affecting components increases
Solution Approach 1:
The invention applies local quality by creating a dedicated accommodation space within the pixel define layer that is spatially separated from the organic light emitting unit. The water absorbent material is placed in this localized region, providing concentrated protection where water vapour is most problematic, while maintaining physical distance from the sensitive components to prevent harmful chemical reactions.
Solution Approach 2:
The pixel define layer is segmented to include a dedicated accommodation space for the water absorbent material, separating the absorbent function from the component housing function. This segmentation allows the water absorbent material to be positioned optimally for absorption effectiveness while maintaining spatial separation from the organic light emitting unit, thus preventing direct contact and potential chemical reactions.
3Reliability
If accommodation space is provided in pixel define layer for water absorbent material, then water vapour absorption capability is enhanced, but device structure complexity increases
Solution Approach 1:
The invention merges the water absorption function with the existing pixel define layer structure by incorporating an accommodation space within it. Rather than adding a separate independent component, the water absorbent material is integrated into the pixel define layer, combining multiple functions (pixel definition and water absorption) into a single structural element, thus enhancing protection capability without proportionally increasing overall device complexity.
Solution Approach 2:
The pixel define layer is given multi-functionality by incorporating the water absorbent material within it. The same structural layer that defines pixel boundaries now also serves as a water absorption barrier, eliminating the need for separate dedicated water absorption components and reducing overall device complexity while enhancing water vapour protection capability.
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 absorbs water vapors within the display device, preventing performance degradation and prolonging the service life of organic light emitting display devices without altering the original size or structure of the pixels.
Implementation Method 1
an accommodation space is provided in the pixel define layer and within which a water absorbent material is provided
Data Source
AI summary
Embodiments of the present invention disclose a display back plate. The display back plate comprises: an array substrate; and a pixel define layer formed on the array substrate and for defining an organic light emitting unit. An accommodation space is provided in the pixel define layer and a water absorbent material is provided within the accommodation space; the accommodation space has an opening formed in an upper surface and/or a lower surface of the pixel define layer; and the accommodation space is separated from the organic light emitting unit such that the water absorbent material within the accommodation space is spaced away from the organic light emitting unit. Embodiments of the present invention enable absorption of water vapor inside the organic light emitting display device, to prevent the adverse affection of water vapor on performance of the organic light emitting display device, so as to prolong service life of the organic light emitting display device.