Display Gamma Voltage Gap Controller for Luminance Stability
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Solution Overview
Problem
Display devices experience luminance deviation when switching between different driving frequencies, and existing solutions to reduce power consumption in low power modes often exacerbate this issue due to rapid voltage or current changes.
Innovation Solution
A display device with a power converter system that includes target power voltage and gamma voltage generators, gap controllers, and selectors to manage voltage differences during mode switches, ensuring a consistent gap between gamma and power voltages to maintain constant driving current and prevent luminance deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the pixels are driven at a low frequency to reduce power consumption, then power consumption is reduced, but luminance deviation occurs due to rapid voltage or current change during mode switching
Solution Approach 1:
The gap controller proactively adjusts the gamma voltage before and during mode switching to maintain a consistent gap between gamma voltage and power voltage. This preliminary action prevents rapid current changes that would cause luminance deviation, allowing the display to switch between high and low power modes without compromising luminance stability.
Solution Approach 2:
The system continuously monitors the gap between gamma voltage and power voltage, and the gap controller adjusts the gamma voltage based on this feedback to maintain a constant gap. This feedback mechanism ensures that driving current remains stable during mode transitions, preventing luminance deviation while enabling power consumption reduction at low frequencies.
2Use of energy by moving object
If solutions are applied to reduce power consumption in low power mode, then power consumption is reduced, but luminance deviation is exacerbated due to rapid voltage or current change
Solution Approach 1:
The gap controller acts as an intermediary between the power voltage generator and gamma voltage generator, mediating the voltage relationship during mode transitions. It ensures that the gap between gamma voltage and power voltage remains consistent, thereby preventing the harmful luminance deviation that would otherwise result from rapid voltage changes during low power mode switching.
Solution Approach 2:
The system dynamically adjusts the gamma voltage parameter in response to changes in power voltage during mode switching. By changing the gamma voltage parameter to maintain a constant gap with power voltage, the system enables smooth transitions between power modes without generating luminance deviation, thus reducing power consumption without harmful side effects.
Data Source
AI summary
A display device includes pixels, and a power converter configured to receive a first power voltage and an external input voltage and provide a gamma voltage to a first output terminal. The power converter includes a target power voltage generator circuit configured to generate a target power voltage, a first gamma voltage generator circuit configured to generate a first gamma voltage, a second gamma voltage generator circuit configured to generate a second gamma voltage, a first gap controller configured to generate the second gamma voltage based on the first power voltage, a reference target power voltage, and a reference gamma voltage during a period in which a display mode, and a first selector configured to selectively output the first gamma voltage or the second gamma voltage according to the display mode.