Bistable Display Data Driving Circuit Suppressing Image Fading
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Solution Overview
Problem
Bistable display panels experience image fading due to alternating current common voltages causing pixels to mistakenly update their display grey levels, even when no update is needed.
Innovation Solution
A data driving circuit with a switching element between the display data buffer unit and the data line, controlled by a signal that turns off when the display data voltage matches the target common voltage, preventing unnecessary updates by making the data line 'data floating'.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If AC common voltage transitions are used to update display data voltages, then display refresh is achieved, but pixels mistakenly update their grey levels causing image fading
Solution Approach 1:
A control signal storage unit is introduced as an intermediary between the display data buffer unit and the data line. This intermediary stores the control signal that determines whether the display data voltage should be updated, preventing direct transmission when updates are unnecessary and thus avoiding mistaken grey level changes while maintaining refresh functionality
Solution Approach 2:
The data driving circuit performs self-service by using the display data voltage itself as the basis for generating the control signal. The control signal storage unit automatically determines whether to block transmission based on whether the display data voltage equals the target common voltage, eliminating the need for external intervention and preventing image fading autonomously
2Duration of action of stationary object
If display data voltages are provided continuously to all pixels, then display refresh is maintained, but unnecessary updates cause fading in pixels that don't need changes
Solution Approach 1:
The control signal storage unit applies local quality control by treating different pixels differently based on their individual update needs. Pixels requiring updates receive display data voltages while pixels not needing updates have their data lines blocked, allowing continuous display maintenance without uniform updates that cause fading
Solution Approach 2:
The control signal storage unit performs preliminary action by pre-storing the control signal that determines update necessity before the display data voltage is transmitted. This preliminary determination prevents unnecessary transmissions that would cause fading while ensuring required updates occur timely
Data Source
AI summary
An exemplary data driving circuit for providing a display data voltage to a data line includes a data driving module. The data driving module includes a display data buffer unit and a switching element. The display data buffer unit is used to provide the display data voltage. The switching element is electrically coupled between the display data buffer unit and the data line and determines whether to allow the display data voltage provided by the display data buffer unit to be transmitted to the data line according to a control signal. Furthermore, the control signal controls the switching element to be turned off when the display data voltage provided by the display data buffer unit equals a predetermined voltage. Moreover, a display panel using the above data driving circuit also is provided.