Display Device With Dual Data Lines for Faster Pixel Driving
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Solution Overview
Problem
Display devices with increased pixel count and screen size face challenges in high-speed data line driving due to increased load capacitance, leading to prolonged initialization and data writing times.
Innovation Solution
The display device employs a dual data transfer line system with switching circuits to control electrical coupling between data lines and transfer lines, allowing simultaneous data transmission to multiple pixel circuits, thereby reducing the load on individual data lines and enhancing driving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels and screen size are increased to achieve high definition, then the display quality is improved, but the load capacitance of the data line increases causing slower driving speed
Solution Approach 1:
The patent divides the data transmission system into multiple independent data lines (first data line and second data line) that operate in parallel. Each data line serves a subset of pixel circuits, reducing the load capacitance per line while maintaining overall display resolution. This segmentation allows high-definition display without excessive capacitance burden on individual data lines.
2Measurement precision
If the load capacitance of the data line increases due to more pixels, then the display resolution is improved, but the initialization time and data writing time are increased
Solution Approach 1:
By segmenting the pixel circuits into multiple groups served by different data lines, the patent reduces the capacitance load on each data line. This enables faster charging and discharging cycles, thereby reducing initialization time and data writing time while maintaining high display resolution through the combined capacity of multiple data lines.
Solution Approach 2:
The patent introduces a temporal dimension by using switching circuits to time-division multiplex the data transfer lines. The first and second data lines are selectively coupled to pixel circuits in alternating periods, effectively doubling the data transmission capacity without increasing physical wire count, thus reducing initialization and writing times.
3Device complexity
If more pixel circuits are coupled to one data line, then the device complexity is reduced, but the data line cannot be driven at high speed
Solution Approach 1:
The patent segments the pixel circuits into multiple groups, each served by a dedicated data line. This segmentation increases the number of data lines but reduces the capacitance load on each individual line, enabling high-speed driving. The trade-off is managed by using switching circuits that can time-division multiplex the lines when needed.
Solution Approach 2:
The patent employs switching circuits that can dynamically connect or disconnect data lines to pixel circuits based on timing requirements. This dynamic control allows the system to adapt the effective number of active data lines during different operation phases, optimizing both speed and complexity management.
Data Source
AI summary
A display device includes first light emitting elements, second light emitting elements, a first data transfer line, a second data transfer line, a first data line, a second data line, first pixel circuits coupled to the first data line, second pixel circuits coupled to the second data line, a first switching circuit controlling electrical coupling between the first data line and the second data transfer line, and a second switching circuit controlling electrical coupling between the second data line and the second data transfer line, the first data line is supplied, from the second data transfer line via the first switching circuit, with a signal for causing each of the plurality of first light emitting elements to emit light, and the second data line is supplied, from the second data transfer line via the second switching circuit, with a signal for causing each of the plurality of second light emitting elements to emit light.