Dynamic Buffer Bias Control for Display Power Savings
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Solution Overview
Problem
Conventional flat panel display bias control techniques waste energy by maintaining constant high bias on buffers, leading to increased power consumption, while reducing bias results in inadequate driving capability and display issues like partial white and discontinuous images.
Innovation Solution
A dynamic bias control system that switches between low bias during power-saving periods and normal bias during transition periods, using a bias control unit to manage the buffer's bias state, ensuring adequate driving capability and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If constant high bias is provided to the buffer, then adequate driving capability is maintained for timely data voltage transmission, but power consumption increases
Solution Approach 1:
The bias control unit dynamically adjusts the bias state of the buffer based on operational requirements. During transition periods when data voltage changes occur, the buffer operates in a high bias state to ensure adequate driving capability. During stable periods when no voltage transition is detected, the buffer switches to a low bias state to reduce power consumption. This dynamic adaptation resolves the contradiction between maintaining reliable driving capability and minimizing power consumption.
Solution Approach 2:
The invention changes the bias parameter of the buffer from a constant high value to a variable value that switches between high and low states. The bias control unit monitors the data voltage and switch control signal to determine when transitions occur, then adjusts the bias accordingly. This parameter change allows the system to maintain adequate driving capability during transitions while significantly reducing power consumption during stable periods.
2Use of energy by moving object
If bias is reduced to save power, then power consumption decreases, but driving capability becomes inadequate causing display defects
Solution Approach 1:
The bias control unit detects transition periods in advance by monitoring the data voltage and switch control signal before they complete. When a transition is detected, the buffer is immediately switched to the high bias state to ensure adequate driving capability is available from the outset. This preliminary action prevents display defects by ensuring the buffer has sufficient capability before voltage transitions occur, while still allowing power savings during stable periods.
Solution Approach 2:
The buffer's bias state is made dynamic rather than static, switching between low and high states based on real-time operational conditions. This dynamic adjustment ensures that power consumption is minimized during stable periods while driving capability is adequately maintained during transitions, resolving the contradiction between power savings and display quality.
3Reliability
If the buffer operates continuously in high bias state, then display quality is maintained, but energy is wasted during stable periods
Solution Approach 1:
The buffer operates in periodic cycles, alternating between high bias state during transition periods and low bias state during stable periods. The bias control unit uses the data enable signal and data voltage monitoring to identify these periodic cycles, switching the buffer bias accordingly. This periodic action maintains display quality during critical transitions while eliminating energy waste during stable periods when high bias is not needed.
Solution Approach 2:
The invention identifies the stable periods when the buffer would otherwise waste energy and converts this idle time into an opportunity for power savings. By detecting when no voltage transition is occurring, the system safely reduces bias to a low state, turning what would be energy-wasting idle operation into a beneficial power-saving opportunity without affecting display quality.
Data Source
AI summary
A driving device and a driving method for dynamic bias are provided. The driving device includes a buffer and a bias control unit. An input terminal of the buffer receives a data voltage, and an output terminal of the buffer is connected to a load through a switch. The bias control unit connected to the buffer controls a bias of the buffer dynamically. During a transition period of the data voltage, the bias control unit controls the buffer in a normal bias state. During a power-saving period, the bias control unit controls the buffer in a low bias state, and controls the buffer in the normal bias state during a turning-off period of the switch. The driving device controls the buffer to sustain data voltage quickly during the turning-off period of the switch, so as to avoid the data voltage received by the load having errors and reduce power consumption.