Pixel Circuit Memory Voltage Preservation for Display Flicker Reduction
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Solution Overview
Problem
Display devices experience power wastage and flickers when displaying still images due to charge dissipation in pixel memory circuits, leading to repeated updating operations.
Innovation Solution
The display device incorporates a pixel circuit with a first capacitor, a transistor, a sample circuit, and a memory circuit, where the memory circuit preserves voltages using additional capacitors and transistors to minimize charge dissipation during refreshing processes, allowing for simultaneous refreshing of multiple pixel circuits with controlled voltage changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixels are updated with the same data for still images, then image display is maintained, but power consumption increases
Solution Approach 1:
The memory circuit stores pixel voltages after the initial update operation, so that when the pixel needs to be refreshed later, the voltage is already prepared and can be transferred without requiring a full re-update of all pixel parameters, thus reducing power consumption while maintaining image display stability
Solution Approach 2:
The memory circuit maintains the pixel voltage continuously after storage, allowing the pixel to retain its displayed image information without requiring continuous power-intensive update operations, thereby extending the time between necessary refreshes and reducing overall power consumption
2Use of energy by moving object
If memory circuits store pixel voltages to reduce updating operations, then power consumption decreases, but charge dissipation causes flickers
Solution Approach 1:
The compensation circuit performs preliminary compensation of the stored voltage in the memory circuit before the pixel is refreshed, correcting any charge dissipation that has occurred. This ensures that when the pixel is updated, the voltage is already corrected, preventing flickers while maintaining the low power consumption benefit of voltage storage
Solution Approach 2:
The compensation circuit monitors the voltage in the memory circuit and provides feedback to correct any dissipation. By detecting the voltage degradation and actively compensating for it, the system maintains image display stability without requiring continuous full updates, thus preserving the power savings
3Productivity
If pixel voltages are stored in memory circuits, then updating operations are reduced, but charge dissipation occurs over time
Solution Approach 1:
The compensation circuit performs preliminary compensation of voltage loss in the memory circuit before the next pixel refresh operation. This ensures that the voltage is restored to its correct level proactively, preventing charge dissipation from causing display errors while maintaining efficient refreshing
Solution Approach 2:
The compensation circuit changes the voltage parameter in the memory circuit by actively injecting or removing charge to compensate for dissipation. This parameter adjustment restores the voltage to its intended value, preventing the degradation that would otherwise occur over time while maintaining the efficiency of the storage approach
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
This solution reduces flickers and power consumption by effectively preserving image data voltages, enabling efficient refreshing of pixel circuits with reduced charge dissipation and compatible operation with alternating data polarities.
Implementation Method 1
The first capacitor has a first terminal and a second terminal, wherein the first terminal of the first capacitor is coupled to the common voltage line
Data Source
AI summary
The display panel includes a source line, a common voltage line, a gate line, and a pixel circuit. The pixel circuit includes a first capacitor, a first transistor, a sample circuit, and a memory circuit. The first capacitor is coupled to the common voltage line. The first transistor is coupled to the source line and the first capacitor. The sample circuit includes a second transistor, and the second transistor is coupled to the source line and the first capacitor. The memory circuit is coupled to the first transistor, the sample circuit, and the gate line.