Pixel Circuit Internal Gate Signal Generator for Narrow Bezel Displays
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Solution Overview
Problem
Existing organic light-emitting display devices face challenges in achieving narrow bezel designs due to the increased size of gate driving circuits required to compensate for variations in electrical characteristics of driving elements, which also leads to higher power consumption and complexity in flexible and stretchable displays.
Innovation Solution
The implementation of a pixel circuit with an internal gate signal generator that reduces the number of gate lines and gate driver circuitry by generating necessary gate signals within the pixel circuit, allowing for a more compact design and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal compensation circuit is implemented to compensate for variations in electrical characteristics of driving elements, then the electrical characteristic compensation is improved, but the gate driving circuit size increases
Solution Approach 1:
The patent merges the gate signal generation function into the pixel circuit by integrating an internal gate signal generator within each pixel. This combines previously separate functions (gate driving circuit and pixel circuit) into a unified structure, eliminating the need for extensive external gate driving circuitry while maintaining compensation capabilities.
Solution Approach 2:
The patent segments the gate signal generation function by distributing internal gate signal generators to individual pixels or pixel groups. Instead of using a centralized gate driving circuit, each segment (pixel) generates its own gate signals locally, reducing the overall circuit area while maintaining functional integrity.
2Ease of operation
If multiple gate lines are used to drive the pixel circuit, then the gate signal control is improved, but the bezel area increases
Solution Approach 1:
The patent merges multiple gate signal functions into a single gate line by implementing an internal gate signal generator within the pixel circuit. This generator produces multiple gate signals (e.g., ELVDD, ELVSS, initialization signals) from a single input gate line, eliminating the need for multiple separate gate lines and reducing bezel area.
Solution Approach 2:
The patent transitions from a spatial arrangement of multiple gate lines to a temporal signal generation approach. Instead of using multiple simultaneous gate lines, the internal generator creates multiple gate signals sequentially or in different phases from a single line, effectively moving the problem from spatial to temporal domain.
3Area of stationary object
If a compact pixel circuit design is implemented to reduce bezel area, then the display area is improved, but the power consumption increases
Solution Approach 1:
The patent employs periodic switching actions within the pixel circuit to minimize power consumption. The internal gate signal generator uses periodic switching of switch elements (e.g., first, second, third switch elements) to control current flow through the light emitting element, ensuring power is consumed only when needed for light emission and not during idle or compensation phases.
Data Source
AI summary
A pixel circuit, a display device, and a mobile terminal including the display device are disclosed. The pixel circuit includes one or more first switch elements configured to be turned on in response to a first gate signal; one or more second switch elements configured to be turned on in response to a second gate signal; one or more third switch elements configured to be turned on in response to a third gate signal; an internal gate signal generator configured to receive the first gate signal and the second gate signal to output the third gate signal; and a driving element configured to drive a light emitting element.