Liquid Crystal Display Residual Image Decay via Reset Circuit
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from a residual image effect due to slow discharge of electric charges from storage capacitors after power-off, leading to prolonged persistence of displayed images.
Innovation Solution
Incorporating a reset circuit and a charging/discharging module that enables a high-level gate signal reference voltage upon power-off, switching on all thin film transistors to rapidly discharge accumulated charges through the LCD device's storage units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional LCD structure without reset circuit is used, then device complexity is low, but residual image decays slowly
Solution Approach 1:
The reset circuit is activated before power-off to pre-charge the storage capacitors through the thin film transistors, creating a discharge path that accelerates residual image decay. This preliminary action prepares the circuit state to enable faster charge discharge when power is removed, directly addressing the slow decay speed problem without requiring fundamental structural changes.
Solution Approach 2:
The reset circuit acts as an intermediary component between the power supply and the liquid crystal display pixels. It mediates the charge discharge process by providing controlled charge paths through the thin film transistors, enabling faster residual image decay without directly modifying the liquid crystal material or display structure.
2Ease of operation
If storage capacitors retain charges after power-off, then image persistence is maintained, but residual image effect occurs
Solution Approach 1:
The invention extracts the charge retention function from the storage capacitors alone by introducing a parallel discharge path through the thin film transistors controlled by the reset circuit. This separates the image persistence function (maintained during operation) from the residual image problem (eliminated during power-off), allowing the storage capacitors to fulfill their primary function while the reset circuit handles charge discharge.
Solution Approach 2:
Instead of preventing charge accumulation in storage capacitors (which would affect normal operation), the invention inverts the approach by actively promoting charge discharge after power-off through the reset circuit. This reverse action—facilitating charge flow rather than blocking it—solves the residual image problem while preserving normal display functionality.
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
Facilitates fast decay of residual images by efficiently discharging stored charges, improving the visual experience by eliminating lingering images quickly after the LCD is turned off.
Implementation Method 1
By means of varying voltage drops between opposite sides of the liquid crystal layers, the twisted angles of the liquid crystal molecules of the liquid crystal layers can be changed so that the transparency of the liquid crystal layers can also be changed accordingly for illustrating images
Implementation Method 2
the electric charges accumulated in the equivalent capacitors 116 cannot be discharged rapidly and can only be released through the leakage currents of the thin film transistors 114
Data Source
AI summary
By way of enabling a reset signal while turning off a liquid crystal display, a method for decaying residual image of the liquid crystal display is capable of setting the corresponding gate signal of each of a plurality of gate lines of the liquid crystal display based on the reset signal being enabled. Accordingly, enhanced discharging processes on all the storage units of the liquid crystal display for fast decaying residual image can be performed via the data switches of the liquid crystal display turned on by the gate signals being set. The reset operation for performing discharging processes in response to the reset signal can be carried out based on a reset circuit for setting all the gate signals to become high-level signals, or based on a charging/discharging module for furnishing a high-level voltage directly to all the gate lines.