Electro-optical Device Power Supply Segmentation for Display Uniformity
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Solution Overview
Problem
Existing electro-optical devices face display unevenness issues due to the increased number of power supplies required for pixel and peripheral circuits, leading to decreased power supplying capability and potential display quality degradation.
Innovation Solution
The electro-optical device employs a configuration with separate power supply lines for pixel and scan line drive circuits, where a common operation voltage is used for both, and additional power supply lines are strategically disposed to minimize voltage changes and coupling effects, thereby preventing display unevenness without increasing the number of power supplies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power supplies are used for pixel circuit and peripheral circuit, then display unevenness is prevented, but the number of power supplies increases and power supplying capability decreases
Solution Approach 1:
The power supply system is segmented into separate power supply lines (first power supply line for pixel circuit, second power supply line for peripheral circuit) while maintaining a common power supply source. This segmentation isolates voltage fluctuations in different circuits, preventing display unevenness caused by peripheral circuit operations, while avoiding the need for completely separate power supplies.
Solution Approach 2:
Different regions of the device are provided with different power supply characteristics through separate power supply lines. The pixel circuit region receives power through the first power supply line with stable voltage, while the peripheral circuit region receives power through the second power supply line, allowing each region to have optimized power characteristics without increasing the total number of power supplies.
2Reliability
If separate power supplies are used for pixel circuit and peripheral circuit, then voltage change impact is reduced, but the number of terminals increases
Solution Approach 1:
Multiple power supply lines (first and second power supply lines) are merged into a single common power supply source. This merging approach provides separate power distribution paths that isolate voltage fluctuations, while sharing the common power supply infrastructure, thereby reducing the number of external terminals required compared to completely separate power supplies.
3Device complexity
If common power supply is used for pixel circuit and peripheral circuit, then the number of power supplies is reduced, but display unevenness occurs due to voltage change
Solution Approach 1:
The power distribution is segmented into separate power supply lines (first power supply line connected to pixel circuit, second power supply line connected to peripheral circuit) that originate from a common power supply. This segmentation prevents voltage changes in the peripheral circuit from directly affecting the pixel circuit, thereby preventing display unevenness while maintaining a single common power supply source.
Data Source
AI summary
An electro-optical device that includes a display unit includes a scan line drive circuit, supplies a predetermined control signal including at least one scan signal to each row, and includes at least a logic circuit generates a control signal, and an output circuit outputs the control signal to the pixel circuit, a first power supply line supplies a first operation voltage to the pixel circuit, a second power supply line supplies a second operation voltage to the scan line drive circuit and is disposed separately from a portion of the first power supply line which is located within a pixel circuit, and a third power supply line supplies the first operation voltage to the output circuit from the first power supply line and is disposed separately from a portion of the second power supply line which is located within the scan line drive circuit.