Display Driving Circuit Ghost Issue Elimination
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Solution Overview
Problem
Electrophoretic displays suffer from the 'ghost issue' due to the insulating solvent limiting the movement speed of charged color particles, causing the previous frame to persist during the display of the current frame, especially when the previous frame has a long displaying time.
Innovation Solution
A driving method and circuit that includes a timing control unit to execute a specific display procedure, such as displaying a full-white or full-black frame, if a counting value exceeds a predetermined time, thereby avoiding the ghost issue by inserting a brief intermediate frame during image switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electrophoretic display uses insulating solvent to enable low-power consumption, then power consumption is reduced, but the movement speed of charged color particles is limited causing ghost issue
Solution Approach 1:
The patent applies preliminary action by inserting a specific frame (first frame) before the main frame (second frame) during image switching. This preparatory frame serves to accelerate the movement of charged color particles in advance, ensuring they have sufficient time to reach their target positions before the main frame is displayed, thereby preventing the ghost issue while maintaining low power consumption characteristics of electrophoretic displays
2Duration of action of stationary object
If previous frame has long displaying time to ensure stable display, then display stability is improved, but ghost issue becomes more serious
Solution Approach 1:
The patent implements preliminary action by displaying a specific frame (first frame) prior to the main frame (second frame). This first frame is designed to facilitate the movement of charged color particles during the transition period, ensuring complete particle relocation even after the previous frame has been displayed for a long time, thereby eliminating the ghost issue while maintaining stable display characteristics
Solution Approach 2:
The patent uses an intermediary approach by introducing a specific frame (first frame) as a mediator between the previous frame and the main frame (second frame). This intermediary frame acts as a transition state that facilitates the movement of charged color particles, preventing them from being trapped in intermediate positions that would cause ghosting, while maintaining the stability benefits of longer displaying times
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
This approach improves display quality by eliminating the ghost issue through the strategic insertion of a specific frame during image switching, ensuring smoother transitions and reduced persistence of previous frames.
Implementation Method 1
electrophoretic display, due to the insulating solvent may limit the movement speed of charged color particles
Data Source
AI summary
A driving method of a display unit includes: executing a first display procedure, for displaying a first frame on a display unit of the display driving circuit, and executing a counting mechanism; determining, if a second display procedure for displaying a second frame on the display unit is confirmed to be executed, whether or not a counting value of the counting mechanism is larger than a predetermined value; sequentially executing a specific display procedure and the second display procedure if the counting value is larger than the predetermined value; and directly executing the second display procedure if the counting value is equal to or smaller than the predetermined value. A display driving circuit applicable to be used by the display unit is also provided.