One-bit Memory Circuit for AMOLED Sub-pixels Using Auxiliary Latch
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Solution Overview
Problem
Existing one-bit memory circuits for AMOLED sub-pixels require constant refreshing due to voltage leakage, leading to high power consumption and reduced battery life in mobile devices.
Innovation Solution
A one-bit memory circuit design incorporating a MOS transistor, capacitor, light emitting diode, and auxiliary latch circuit, which allows for a latch function using existing components, enabling the circuit to operate in high and low quality states, reducing the need for frequent refreshing and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant refreshing is applied to sustain voltage on charge storage capacitor, then voltage is maintained, but power consumption increases significantly
Solution Approach 1:
The patent extracts the refreshing operation from continuous execution and applies it selectively only when image changes are detected. The controller monitors image data and disables refreshing when images remain unchanged, eliminating unnecessary power consumption while maintaining voltage sustainability only when needed.
Solution Approach 2:
The patent implements dynamic control of the refreshing mechanism by making it adaptive to image content changes. The refreshing operation transitions from static continuous execution to dynamic conditional execution based on real-time image data comparison, optimizing power consumption while maintaining display quality.
2Reliability
If refreshing frequency is increased to maintain image quality, then image quality is sustained, but power consumption increases
Solution Approach 1:
The patent removes unnecessary refreshing operations by detecting when images have not changed. The controller extracts and eliminates redundant refreshing cycles, maintaining image quality only when actual image changes occur, thereby reducing power consumption significantly.
Solution Approach 2:
The patent applies refreshing partially rather than continuously. Instead of excessive continuous refreshing, the system applies refreshing only to the extent necessary - specifically when image changes are detected - achieving adequate image quality maintenance with minimal power consumption.
3Use of energy by moving object
If refreshing is disabled to reduce power consumption, then power consumption decreases, but voltage leakage causes image degradation
Solution Approach 1:
The patent implements dynamic control where the refreshing state transitions between enabled and disabled based on image content changes. When images change, refreshing is enabled to maintain quality; when images are static, refreshing is disabled to save power, eliminating the need to choose between power consumption and image quality.
Solution Approach 2:
The patent introduces feedback through image data monitoring and comparison. The controller continuously compares current image data with previous data to determine whether refreshing is needed, creating a closed-loop system that adapts refreshing operations to actual display requirements, preventing image degradation while minimizing power consumption.
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
The circuit significantly reduces power consumption and prolongs battery life by allowing the AMOLED sub-pixel to maintain images in a low power state, while maintaining image quality through the latch function, enabling operation in both high and low quality modes.
Implementation Method 1
a charge storage capacitor and a light emitting diode. The voltage on a data line is transferred to a charge storage point when the switch transistor M2 is turned on, and is in a charge holding state when the M2 is turned off
Implementation Method 2
a voltage-controlled current transistor M1, a switch transistor M2, a charge storage capacitor and a light emitting diode
Data Source
AI summary
A one-bit memory circuit for amoled panel sub-pixels is provided with an auxiliary latch circuit and a control switch on the basis of an existing one-bit memory circuit. The control switch is configured for controlling the activation of the auxiliary latch circuit. When the control switch is turned on, the auxiliary latch circuit, together with a voltage-controlled current MOS transistor and a light emitting diode in the existing one-bit memory, forms a latch for latching the voltage on a capacitor in the existing memory circuit. The one-bit memory circuit of the present invention reasonably utilizes components in the existing circuit and cuts down additional components required for achieving the latch function.