Display Driving Circuit Current Control for Power Optimization
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Solution Overview
Problem
Display driving circuits face high current consumption due to the constant bias current required for outputting source signals, which is inefficient, especially when there are minimal changes in display data between frames.
Innovation Solution
A display driving circuit with a current controller that adjusts the bias current of the output buffer based on the data change amount between frames, using a current control signal to determine whether to use a high or low bias current, thereby optimizing current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant high bias current is used in the output buffer to ensure signal output performance, then the reliability of signal transmission is improved, but the current consumption increases significantly
Solution Approach 1:
The patent applies dynamics by making the bias current adjustable rather than constant. The output buffer switches between a first bias current (higher) and a second bias current (lower) based on frame update requirements, allowing the system to adapt current consumption to actual operational needs while maintaining signal transmission reliability when necessary.
Solution Approach 2:
The patent changes the bias current parameter dynamically based on display data comparison results. When the current frame data differs from the previous frame, the bias current is set to the first (higher) value; when data remains the same, it switches to the second (lower) value. This parameter adjustment resolves the contradiction between maintaining reliability and reducing energy consumption.
2Use of energy by moving object
If the bias current is reduced to lower current consumption, then energy efficiency is improved, but the output buffer may fail to drive the panel load effectively
Solution Approach 1:
The system dynamically adjusts bias current levels based on actual demand. During frame updates when panel load driving is critical, the first (higher) bias current is applied to ensure effective operation. During static periods when no updates occur, the second (lower) bias current is used to reduce energy consumption, thus resolving the contradiction between energy efficiency and driving capability.
Solution Approach 2:
The patent implements periodic switching of bias current levels synchronized with frame update cycles. The current is increased periodically during frame updates and reduced during static periods, allowing the system to maintain driving capability when needed while achieving energy efficiency during stable operation.
3Productivity
If the output buffer operates at full current capacity to handle any display change, then the productivity of display updates is ensured, but unnecessary current consumption occurs during static periods
Solution Approach 1:
The patent applies partial action by using only the necessary current level for the current operational state. Instead of continuously operating at full current capacity, the system uses a lower bias current during static periods when full capability is not needed, and only increases to full capacity during frame updates when productivity is required. This eliminates unnecessary energy loss while maintaining display update capability.
Solution Approach 2:
The bias current parameter is changed based on operational requirements. The system compares current frame data with previous frame data and adjusts the bias current parameter accordingly - using higher current only when data changes require display updates, and lowering it during static periods. This resolves the contradiction between maintaining productivity and reducing energy loss.
Data Source
AI summary
A display driving circuit which is improved to actively control current consumption depending on a change in a pattern displayed on a screen. The display driving circuit includes a current controller configured to provide a current control signal corresponding to a data change amount between first display data of a current frame and second display data of a previous frame; and an output buffer configured to sequentially output source signals corresponding to the second display data and the first display data.