Light Emitting Substrate Layout for Uniform Voltage Distribution
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Solution Overview
Problem
Front-lit reflective display apparatuses, such as liquid crystal displays, face challenges in achieving uniform light emission and efficient voltage signal distribution due to the complex arrangement of light emitting elements and signal lines, which affects display performance and reliability.
Innovation Solution
A light emitting substrate with a specific arrangement of light emitting elements in M rows and N columns, grouped into (P×Q) sub-units, connected by P groups of first voltage signal lines and Q groups of second voltage signal lines, allowing for independent voltage signal provision and enhanced signal distribution through main and auxiliary signal lines, ensuring consistent light emission and redundancy in case of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are arranged in a complex grid pattern to increase luminance coverage, then the display area and brightness are improved, but the uniformity of light emission deteriorates due to irregular voltage distribution
Solution Approach 1:
The patent divides the light emitting element array into multiple groups (first light emitting element groups and second light emitting element groups) with different connection patterns. Specifically, light emitting elements in odd columns are connected in one configuration while those in even columns use a different configuration, creating segmented voltage distribution zones that collectively achieve uniform light emission across the entire display area.
2Ease of operation
If more signal lines are added to control individual light emitting elements, then the controllability and resolution are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the control of multiple light emitting elements into fewer signal lines by creating groups of elements that share common voltage supply paths. Multiple light emitting elements are connected in series or parallel configurations within groups, allowing a single signal line to control the voltage distribution across multiple elements, thereby reducing the total number of required signal lines while maintaining controllability.
3Power
If light emitting elements are connected in series to increase driving voltage control, then the voltage signal distribution is improved, but the reliability deteriorates due to lack of redundancy
Solution Approach 1:
The patent segments the light emitting element connections into multiple independent groups with different connection topologies. Some groups use series connections for voltage control while other groups use parallel or mixed connections for current redundancy. This segmentation ensures that if one connection path fails, other paths can maintain operation, thereby improving reliability while preserving voltage control capability.
Solution Approach 2:
The patent changes the connection parameters (series/parallel configuration) of light emitting element groups based on their position and function within the display. By varying the connection type across different groups rather than using a uniform connection scheme, the system achieves both effective voltage control and enhanced reliability through diversified failure modes.
4Manufacturing precision
If the number of voltage signal lines is increased to provide independent control to each column, then the signal distribution precision is improved, but the manufacturing cost and complexity increase
Solution Approach 1:
The patent designs the voltage signal lines to serve multiple functions simultaneously. Each voltage signal line not only provides voltage control to its primary group of light emitting elements but also contributes to the overall voltage distribution network that supports multiple groups. This multi-functionality allows fewer signal lines to achieve precise signal distribution across the entire array, reducing manufacturing complexity while maintaining precision.
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 enables uniform light emission, increased driving current, and improved reliability by allowing independent control of light emitting elements and efficient signal distribution, addressing the challenges of non-uniformity and reliability in front-lit reflective displays.
Implementation Method 1
a plurality of light emitting elements arranged in M rows and N columns
Data Source
AI summary
A light emitting substrate is provided. The light emitting substrate includes at least one light emitting controlling unit. The at least one light emitting controlling unit includes a plurality of light emitting elements arranged in M rows and N columns and grouped into (P×Q) number of sub-units, M being an integer equal to or greater than one, N being an integer equal to or greater than one, P being an integer equal to or greater than one, and Q being an integer equal to or greater than one; P groups of first voltage signal lines; and Q groups of second voltage signal lines. The (P×Q) number of sub-units are arranged in P rows and Q columns. A respective sub-unit in a p-th row and a q-th column includes K columns of light emitting elements, K being an integer equal to or greater than one.