Display Controller Mode Switching for Color Bleeding Reduction
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Solution Overview
Problem
Existing display devices, such as liquid crystal and organic light-emitting displays, experience color bleeding and degraded visibility due to varying light emission times of light-emitting elements across different wavelength bands.
Innovation Solution
A controller is introduced that includes an input image data receiving circuit, mode control circuit, scan driving control circuit, and power driving control circuit to manage frame counts, luminance control, and voltage levels to optimize display modes, reducing color bleeding and improving visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light-emitting elements operate with different emission times for different wavelength bands, then color emission capability is improved, but color bleeding occurs and visibility degrades
Solution Approach 1:
The patent applies preliminary action by applying an initialization voltage to the anode before the light-emitting element emits light. This pre-initialization ensures that the element is properly reset and prepared for emission, preventing residual charge from causing color bleeding in subsequent emissions across different wavelength bands.
Solution Approach 2:
The patent changes the voltage level parameter by applying different voltage levels to the anode depending on the operational mode. In the second mode, a higher voltage level is applied to the anode compared to the first mode, which adjusts the emission characteristics and reduces color bleeding while maintaining color emission capability.
2Object-affected harmful factors
If initialization voltage level is increased to reduce color bleeding, then color bleeding is reduced, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the initialization voltage level adjustable based on operational conditions. The controller can switch between different voltage levels (first level in first mode, second level in second mode) depending on whether color bleeding reduction is prioritized or power consumption is prioritized, allowing dynamic optimization of the trade-off.
Solution Approach 2:
The patent changes the voltage parameter dynamically by selecting different voltage levels for the anode based on the operational mode. This allows the system to adapt the initialization voltage to match the desired performance characteristics, reducing color bleeding when needed while conserving power during normal operation.
Data Source
AI summary
A controller of a display device includes an input image data receiving circuit, a mode control circuit, a scan driving control circuit, and a power driving control circuit. The input image data receiving circuit receives input image data and generates a count value corresponding to the number of frames in which an image is continuously played based on a received vertical synchronization signal, memory write signal, and memory write sustain signal. The mode control circuit generates a mode indicator signal based on the count value and a luminance control signal. The scan driving control circuit outputs a gate control signal for controlling a clock based on the mode indicator signal. The power driving control circuit outputs a voltage control signal for controlling a level of a power voltage based on the mode indicator signal.