Display Device Dimming Control With Gamma Compensation
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Solution Overview
Problem
Display devices experience degradation in display quality after dimming due to issues with brightness control and gamma voltage management.
Innovation Solution
A display device with a driving controller that adjusts brightness control modes based on dimming ranges and updates gamma voltage levels to maintain display quality, using a first and second brightness control mode and generating gamma voltages to compensate for grayscale level loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If brightness control is implemented using conventional methods, then dimming function is achieved, but display quality degrades and grayscale levels are lost
Solution Approach 1:
The patent changes the operating parameters by introducing multiple brightness control modes (first and second modes) with different control characteristics. The driving controller selects appropriate modes based on dimming ranges, adjusting pulse width modulation parameters and gamma voltage levels to maintain display quality across different brightness levels.
Solution Approach 2:
The system dynamically switches between different brightness control modes based on the input dimming code value. The driving controller determines which mode to use by comparing the dimming code against reference values, allowing adaptive control that maintains optimal display quality for different dimming conditions.
2Reliability
If gamma voltages are not updated, then device complexity is reduced, but chromaticity differences increase and display quality degrades
Solution Approach 1:
The system implements feedback by having the driving controller monitor the input dimming code value and dynamically adjust gamma voltages accordingly. The controller updates gamma voltage levels based on the selected brightness control mode, creating a closed-loop system that maintains display quality while managing complexity through intelligent control.
3Illumination intensity
If pulse width adjustment is used for brightness control, then dimming is achieved, but grayscale levels are lost and chromaticity changes
Solution Approach 1:
The patent segments the brightness control into different ranges (first and second dimming ranges) with different control strategies. By dividing the overall dimming range into segments, the system can apply appropriate control methods to each segment, preserving grayscale information that would be lost in a single unified control approach.
Data Source
AI summary
A display device includes a driving controller determining whether a dimming value is within one of first and second ranges, compare, in response to determining of the dimming value being within the first range, the dimming value with a first value and operate, in response to a comparison result of the dimming value and the first value, in one of first and second modes, compare, in response to determining of the dimming value within the second range, the dimming value with a second value and operate, in response to a comparison result of the dimming value and the second value, in one of the first and second modes, output the light emitting control signal for adjusting a pulse width of the light emitting signal in the first mode, and output the output data signal by modifying the input image signal based on the dimming value in the second mode.