Backlight Driving Synchronization for Scan-Type Displays
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Solution Overview
Problem
Conventional liquid crystal display systems experience a significant frame delay between backlight emission and light modulation, leading to abnormal image frame displays due to the asynchronous control of light transmittance by the liquid crystal driver and backlight driver.
Innovation Solution
A backlight driving method and device that generates internal synchronization control signals with time delays, aligning the brightness changes of the backlight source areas with the receipt of image data segments, ensuring synchronized light emission and modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the backlight driver drives the backlight source based on the original synchronization control signal and adjustment data from the first piece of image data, then the backlight source emits light according to the first piece of image data, but the liquid crystal driver controls the light transmittances based on the third piece of image data, resulting in a large frame delay and abnormal display
Solution Approach 1:
The patent applies preliminary action by having the backlight driver store multiple pieces of adjustment data (first, second, and third pieces) in advance before they are needed for display. The driver generates internal synchronization control signals that retrieve and apply the appropriate adjustment data at the correct time, ensuring that the backlight source emits light synchronized with the liquid crystal panel's light transmittance control based on the same piece of image data, thereby eliminating frame delay and abnormal display issues
2Productivity
If the controller generates adjustment data sequentially for each piece of image data, then the adjustment data is generated in order, but the backlight driver uses the adjustment data from an earlier piece of image data while the liquid crystal driver uses data from a later piece, causing asynchronous control
Solution Approach 1:
The patent introduces an intermediary mechanism in the form of internal synchronization control signals generated by the backlight driver. These signals act as a mediator between the sequentially generated adjustment data and the display timing, ensuring that the backlight source's light emission is precisely synchronized with the liquid crystal panel's light transmittance control. The internal synchronization control signals retrieve the appropriate adjustment data from storage and apply it at the correct display moment, maintaining both processing efficiency and synchronization accuracy
Data Source
AI summary
A backlight driving method includes steps of: (A) receiving a piece of image data that includes a number (K) of segments, where K≥2; (B) generating a piece of adjustment data that includes a number (K) of segments; each segment of the adjustment data being generated based on a respective segment of the image data and upon receipt of the respective segment of the image data; (C) generating, based on a piece of delay data and on an original synchronization control (SC) signal that has a pulse, an internal SC signal that has a number (K) of pulses; and (D) generating a backlight driving output based on the adjustment data and the internal SC signal, so as to drive a backlight source of a scan-type display to emit light.