Pixel Circuit Capacitor Segmentation for Flicker Reduction
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Solution Overview
Problem
Display devices face issues with power wastage and poor display quality due to charge dissipation in memory in pixel (MIP) circuits, leading to flickers when displaying still images, as the pixel voltages drop over time.
Innovation Solution
The display device incorporates a pixel array with a source driver and control driver, utilizing a pixel circuit with capacitors and transistors to store image data and manage voltage levels, allowing for efficient refreshing and maintaining brightness without repeated updating, thereby preventing charge dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixels are updated with the same data repeatedly to maintain brightness, then display quality is maintained, but power consumption increases
Solution Approach 1:
The pixel circuit performs preliminary action by storing the pixel voltage in the first capacitor C1A during the writing phase. This stored voltage is then maintained throughout the display period without requiring repeated updating operations, thereby reducing power consumption while maintaining display quality.
Solution Approach 2:
The memory in pixel circuit serves the self-service function by automatically maintaining the pixel voltage through the first capacitor C1A and refreshing it only when necessary (when common voltage polarity changes). This eliminates the need for continuous external updating, reducing power consumption while maintaining brightness.
2Use of energy by moving object
If pixels are updated less frequently to save power, then power consumption is reduced, but charge dissipation causes flickers and poor display quality
Solution Approach 1:
The pixel circuit performs preliminary action by storing the pixel voltage in the first capacitor C1A during the writing phase. This stored voltage is then maintained throughout the display period without requiring repeated updating operations, thereby reducing power consumption while maintaining display quality.
Solution Approach 2:
The pixel circuit implements periodic action by refreshing the stored voltage at specific intervals - specifically when the common voltage polarity changes. This periodic refreshing prevents charge dissipation and flickers while minimizing the number of updates, thus balancing power consumption and display quality.
3Device complexity
If a single capacitor is used to store pixel voltage, then device complexity is reduced, but charge dissipation occurs over time causing flickers
Solution Approach 1:
The pixel circuit applies segmentation by dividing the voltage storage function into two separate capacitors: the first capacitor C1A stores the pixel voltage, and the second capacitor C2A stores the gate voltage of the first transistor. This segmentation prevents charge dissipation and flickers while maintaining reasonable device complexity.
Solution Approach 2:
The pixel circuit merges the storage functions of two capacitors (C1A for pixel voltage and C2A for gate voltage) to work together in maintaining display quality. This combining of storage functions prevents charge dissipation more effectively than a single capacitor, addressing the reliability issue.
4Device complexity
If common voltage polarity remains constant to simplify control, then control complexity is reduced, but image aging occurs and display quality deteriorates
Solution Approach 1:
The pixel circuit implements periodic action by refreshing the stored voltage at specific intervals - specifically when the common voltage polarity changes. This periodic refreshing prevents charge dissipation and flickers while minimizing the number of updates, thus balancing power consumption and display quality.
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 power consumption and minimizes flickers by effectively storing and refreshing image data, maintaining consistent brightness and improving display quality.
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
Implementation Method 2
The second capacitor has a first terminal and a second terminal, the first terminal of the second capacitor is coupled to the first control line
Data Source
AI summary
A pixel circuit includes a first capacitor, a second capacitor, a first transistor, a second transistor, and a third transistor. The first capacitor has a first terminal coupled to a common voltage line. The second capacitor has a first terminal coupled to a first control line. The first transistor has a first terminal coupled to a source line, a second terminal coupled to a second terminal of the first capacitor, and a control terminal coupled to a second terminal of the second capacitor. The second transistor has a first terminal coupled to the control terminal of the first transistor, and a control terminal coupled to a second control line. The third transistor has a first terminal coupled to a second terminal of the second transistor, a second terminal coupled to a third control line, and a control terminal coupled to the second terminal of the first transistor.