Display Overdrive Control for Extreme Grayscale Response
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Solution Overview
Problem
Existing overdrive technology cannot be applied in situations where the display grayscale is the highest or lowest, limiting its effectiveness in improving response time during grayscale adjustments.
Innovation Solution
An electronic device with a voltage generation unit, grayscale adjustment unit, and overdriving unit that generates and adjusts voltages to overdrive intermediate grayscales when the display is at extreme grayscales, thereby reducing response time without significantly affecting brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If overdrive is applied to speed up response time during grayscale adjustments, then response time is improved, but overdrive cannot be applied when display grayscale is at the highest or lowest level
Solution Approach 1:
The patent applies preliminary action by using the current grayscale level as a reference and pre-calculating target grayscale levels and corresponding voltages. When the display is at extreme grayscale levels (0 or 255), the system cannot apply traditional overdrive that requires higher or lower voltages. Instead, the patent uses the current extreme grayscale as a reference point, calculates appropriate target grayscale levels within the valid range, and applies corresponding voltages to achieve response time improvement without exceeding the display's grayscale boundaries.
2Loss of time
If overdriving unit overdrives with voltage higher than predetermined voltage, then response time is reduced, but transmittance may be significantly affected
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting voltage based on the relationship between grayscale levels and transmittance. Instead of always applying a fixed higher voltage for overdrive, the system calculates target voltages based on the current grayscale level and the desired target grayscale level. The voltage adjustment is optimized to achieve the target grayscale as quickly as possible while maintaining transmittance within acceptable ranges, thus improving response time without significantly affecting brightness.
Data Source
AI summary
An electronic device includes a display unit, a voltage generation unit, a grayscale adjustment unit, and an overdriving unit. The display unit has a relationship curve between the transmittance and the driving voltage. The relationship curve has a predetermined voltage value corresponding to the maximum transmittance. The voltage generation unit generates a first voltage according to a first grayscale, and generates a second voltage according to a second grayscale. The grayscale adjustment unit receives a first display grayscale value, and outputs the second grayscale when the first display grayscale value is equal to the first grayscale. The overdriving unit overdrives the second voltage corresponding to the second grayscale to obtain a first target driving voltage, and it provides the first target driving voltage to the display unit.