Pixel Circuit Voltage Tracking for Static Color Display
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current Memory in Pixel (MIP) display technology is limited to black-and-white displays due to the complexity of Analog Memory Units (AMU) and the inability to integrate them into pixel circuits, hindering the application of MIP displays in color displays.
Innovation Solution
A pixel circuit comprising a data writing unit, a voltage tracking unit, a voltage storage unit, and a liquid crystal capacitor, which allows for the storage and adjustment of data voltage to generate a liquid crystal deflection field for static color displays, using transistors and voltage compensation units to prevent leakage currents and maintain display gray scale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an Analog Memory Unit (AMU) is used to enable color display in MIP technology, then the display capability is improved, but the circuit structure becomes complex and integration into pixel circuit becomes difficult
Solution Approach 1:
The patent uses a 1-bit digital memory to store the polarity of data voltage, and combines it with a charge pump circuit to generate the required analog voltage levels. This copying approach replaces the complex analog memory with a simpler digital memory that replicates the essential function while enabling color display capability
Solution Approach 2:
The patent introduces a charge pump circuit as an intermediary between the digital memory and the liquid crystal capacitor. This charge pump converts the stored digital polarity information into the required analog voltage levels, serving as a mediator that bridges the digital and analog domains without requiring a complex analog memory structure
2Ease of manufacture
If a 1-bit digital memory is used as AMU to simplify the circuit structure, then the ease of manufacture is improved, but the display is limited to black-and-white only
Solution Approach 1:
The patent makes the 1-bit digital memory serve multiple functions: storing data polarity information, controlling the charge pump operation, and enabling both black-and-white and color display modes. This multi-functional design maintains simplicity while expanding display capability
Solution Approach 2:
The patent changes the operating parameters of the pixel circuit by using the stored polarity information to control voltage transformation through the charge pump. By varying the voltage levels and polarity combinations, the system can achieve multiple gray levels and colors from a single-bit storage element
3Use of energy by moving object
If the pixel circuit operates in static display mode to reduce power consumption, then the energy efficiency is improved, but the display gray scale may drift without voltage compensation
Solution Approach 1:
The patent implements a voltage compensation circuit that provides feedback to counteract leakage currents in static display mode. The circuit continuously monitors and adjusts the voltage levels to compensate for charge loss, ensuring stable gray scale representation while maintaining the low power consumption benefits of static display operation
Solution Approach 2:
The patent applies preliminary voltage compensation by pre-charging the liquid crystal capacitor to the correct voltage level before entering static display mode. This preliminary action ensures that the capacitor starts at the correct potential, and the compensation circuit maintains it there, preventing gray scale drift during extended static display periods
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
Enables the static display of color pictures by storing and outputting data or adjustment voltages to maintain consistent display gray scale, effectively overcoming the limitations of existing MIP technology.
Implementation Method 1
the voltage tracking unit is constructed to output a data output voltage based on the data voltage or the adjustment voltage, such that the liquid crystal capacitor generates a corresponding liquid crystal deflection field
Data Source
AI summary
The present disclosure provides a pixel circuit, a method for driving the pixel circuit and a display panel including the pixel circuit. The pixel circuit comprises a data writing unit, a voltage tracking unit, a voltage storage unit and a liquid crystal capacitor. The data writing unit is constructed to transfer a data voltage on a data line to the voltage storage unit and the voltage tracking unit when the pixel circuit is in a normal display mode. The voltage storage unit is constructed to store the data voltage when the pixel circuit is in the normal display mode and transfer the data voltage or an adjustment voltage to the input terminal of the voltage tracking unit when the pixel circuit is in a static display mode. The voltage tracking unit is constructed to output a data output voltage based on the data voltage or the adjustment voltage, such that the liquid crystal capacitor generates a corresponding liquid crystal deflection field.