Display Device Power Voltage Switching Circuit
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Solution Overview
Problem
Large-scale or high-resolution display devices face voltage drop issues due to increased resistance and capacitance, leading to reliability problems with control circuits when continuously supplying high-level control signals.
Innovation Solution
A display device configuration with specific transistor and capacitor arrangements, along with distinct power voltage levels during different periods, to manage voltage distribution and reduce stress on control circuits, including a first transistor with a gate electrode coupled to a first node, a second transistor with a gate electrode coupled to a scan line, and a third transistor with a gate electrode coupled to a control line, along with capacitors and a light-emitting diode, where power voltage levels are adjusted to mitigate IR drop and voltage stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-level control signals are continuously supplied to ensure transistor operation in large-scale or high-resolution display devices, then the display device can overcome voltage drop issues, but control circuits experience increased voltage stress leading to reliability problems
Solution Approach 1:
The patent applies periodic action by switching between different power voltage levels in different time periods. During a first period, a first power voltage level is applied to the first power line, and during a second period, a second power voltage level is applied. This periodic switching allows the control circuit to operate at high voltage when needed while reducing voltage stress during other periods, thereby improving reliability while maintaining display performance.
Solution Approach 2:
The patent implements dynamics by making the power voltage level changeable over time rather than fixed. The power voltage switching circuit dynamically adjusts the voltage level applied to the power line based on different time periods, enabling the system to adapt between high performance mode and low stress mode, thus resolving the contradiction between power delivery and circuit reliability.
2Measurement precision
If the scale or resolution of the display device is increased, then display quality improves, but resistance and capacitance increase causing voltage drop problems
Solution Approach 1:
The patent applies parameter changes by varying the power voltage level parameter over time. Instead of using a single fixed voltage level, the system changes the voltage parameter between a first power voltage level and a second power voltage level at different time periods. This allows the system to compensate for voltage drop in large-scale or high-resolution displays while managing power consumption and heat generation.
Data Source
AI summary
A display device includes pixels, each including a first transistor including a gate electrode, a first electrode, and a second electrode coupled to a first node, a first power line, and a second node, respectively, a second transistor including a gate electrode, a first electrode, and a second electrode coupled to a scan line, the first node, and a third node, respectively, a third transistor including a gate electrode, a first electrode, and a second electrode coupled to a control line, the third node, and the second node, respectively, a first capacitor including first and second electrodes coupled to the first node and an initialization line, respectively, a second capacitor including first and second electrodes coupled to the third node and a data line, respectively, and a light-emitting diode including an anode and a cathode coupled to the second node and a second power line.