Local Dimming Backlight Data Transmission Timing Control
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Solution Overview
Problem
In local dimming backlight systems, the existing data transmission methods result in a significant time delay from image data reception to the output of driving signals by the light-emitting driving module, leading to a risk of display and backlight signal desynchronization due to the limited duration of the vertical synchronization signal's active level state.
Innovation Solution
A backlight data transmission method where the micro control unit receives all backlight data during a first preset time period longer than the vertical synchronization signal's active level state and transmits it to the backlight driving module within a second preset time period, ensuring the total time is less than the vertical synchronization signal period, utilizing a serial peripheral interface protocol to enhance data transmission speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the micro control unit receives backlight data during the vertical synchronization signal's active level state, then the data transmission can be synchronized with the display, but the transmission time is insufficient to complete sending all backlight data
Solution Approach 1:
The micro control unit starts receiving backlight data immediately when the vertical synchronization signal enters the active level state, performing the data reception action as early as possible within the limited time window to maximize the amount of data received before time expires
Solution Approach 2:
The backlight data transmission is divided into two stages: receiving during the active level state (first time period) and continuing reception after the active level state ends (second time period), allowing complete data acquisition without missing any portions
2Loss of information
If the micro control unit extends the data reception period beyond the active level state, then all backlight data can be received completely, but the total transmission time may exceed the vertical synchronization signal period causing desynchronization
Solution Approach 1:
The system dynamically adjusts the data reception timing to extend into the period after the active level state ends, adapting the reception window to accommodate the complete backlight data transmission while maintaining synchronization through controlled timing
Solution Approach 2:
The data reception action continues uninterrupted from the active level state through the extended period, ensuring continuous acquisition of all backlight data without gaps or loss of information
3Reliability
If the data transmission speed is increased to complete backlight data sending within the vertical synchronization signal period, then synchronization is maintained, but the transmission bandwidth requirement increases
Solution Approach 1:
The system begins receiving backlight data at the very start of the active level state, performing preliminary data acquisition as early as possible to reduce the remaining transmission time requirement and lower the needed transmission speed
Data Source
AI summary
The present disclosure provides a backlight data transmission method including: receiving, in response to a first vertical synchronization signal of a current image frame sent from a logic circuit board, an entire of backlight data sent from the logic circuit board during a first preset time period, where the entire backlight data includes backlight data corresponding to backlight regions, and duration of the first preset time period is longer than duration of the first vertical synchronization signal in an active level state during one period; and sending the entire backlight data to a backlight driving module during a second preset time period after the first preset time period, where a sum of the duration of the first preset time period and duration of the second preset time period is less than a period of the first vertical synchronization signal.