OLED Panel Driving Circuit With Adaptive Row Pre-Charging
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Solution Overview
Problem
Existing OLED displays suffer from long scan times and low data transmission rates due to fixed and inflexible scan methods, which are not optimized for varying data requirements, leading to inefficient charging durations and limited refresh rates.
Innovation Solution
A driving method that determines the grayscale of each sub-pixel in a row, calculates the charging time based on the capacitance, power supply voltage, and charging current, and adjusts the pre-charging duration for subsequent rows based on the grayscale differences between adjacent rows, allowing simultaneous charging of sub-pixels with similar or overlapping grayscales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If progressive scanning method is used for charging sub-pixels, then the scan method is simple and fixed, but the scan time is long and data transmission rate is low
Solution Approach 1:
The patent applies dynamics by transforming the fixed scan method into a dynamic adaptive scan method. The scanning process is adjusted in real-time based on grayscale values of sub-pixels, allowing the scan duration for each row to vary according to actual charging needs rather than following a rigid fixed schedule.
Solution Approach 2:
The patent changes the scanning parameters dynamically by calculating required charging times based on grayscale values and adjusting the scan progression accordingly. Rows with lower grayscale requirements are skipped or scanned faster, while rows requiring longer charging time receive appropriate duration, optimizing the overall data transmission rate.
2Ease of operation
If fixed scan time is allocated for each row, then the scan method is simple to implement, but the charging efficiency is low and refresh rate is limited
Solution Approach 1:
The patent applies preliminary action by pre-calculating the grayscale values and required charging times for each row before executing the scan. This allows the system to prepare an optimized scanning schedule in advance, determining which rows need longer charging time and which can be scanned faster, thereby improving charging efficiency without complicating the actual scan execution.
3Stability of the object's composition
If uniform charging duration is applied to all rows, then the charging process is simple and consistent, but the overall scan time is extended and refresh rate is reduced
Solution Approach 1:
The patent applies local quality by differentiating the charging duration for different rows based on their specific grayscale requirements. Instead of applying a uniform charging duration to all rows, the system tailors the charging time locally to each row's needs, allowing rows with lower grayscale values to be charged faster while maintaining adequate charging time for rows requiring higher grayscales.
Data Source
AI summary
A driving method for a display panel, a driving circuit, and a display device are provided. The driving method includes: determining a grayscale of each sub-pixel in each row of sub-pixels, to obtain charging time of each sub-pixel in each row of sub-pixels; and determining a first pre-charging duration of a target row of sub-pixels according to the charging time of each sub-pixel in a previous row of sub-pixels and the charging time of each sub-pixel in the target row of sub-pixels, where the first pre-charging duration is a duration for charging the target row of sub-pixels while charging the previous row of sub-pixels.