Display Control Circuit Dynamic Waveform Switching for Image Quality
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Solution Overview
Problem
Conventional display devices using self-luminous elements, such as LEDs or organic ELs, face challenges in maintaining image quality for moving pictures due to 'hold type' drive methods that result in blurred images, as they require a triangular wave after data write, leading to prolonged illumination periods.
Innovation Solution
A display control circuit that fixes a triangular wave at a voltage level where no illumination occurs during an arbitrary period within a frame period, allowing for improved image quality without converting input data or changing the panel structure, and selectively switches between triangular wave modes based on whether the content is a still picture or moving picture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a triangular wave is provided after data write to extend illumination period, then luminance is raised, but image quality deteriorates and moving pictures become blurred
Solution Approach 1:
The patent applies dynamics by making the drive waveform adaptable - switching between triangular wave (for still pictures) and rectangular wave (for moving pictures) based on the type of display content. This dynamic adjustment allows the system to optimize for luminance when displaying still images while preventing blur when displaying moving images, resolving the contradiction between illumination intensity and image quality
Solution Approach 2:
The patent changes the drive waveform parameter from a fixed triangular wave to a variable waveform that can be selected between triangular and rectangular types. By changing this parameter based on display content requirements, the system achieves high luminance for still pictures while maintaining sharp images for moving pictures, thus resolving the technical contradiction
2Duration of action of stationary object
If triangular wave drive is used to maintain long illumination period, then luminance is improved, but moving picture display quality deteriorates
Solution Approach 1:
The system dynamically selects the drive waveform type based on whether the display content is a still picture or moving picture. For moving pictures, it switches to rectangular wave drive which provides short illumination periods, thereby maintaining sharp image quality while still allowing long illumination periods for still pictures to achieve high luminance
Solution Approach 2:
The patent uses periodic rectangular wave drive signals for moving pictures instead of continuous triangular waves. This periodic action with controlled duty cycle limits the illumination duration, preventing the blur that occurs with prolonged illumination during motion, thus resolving the contradiction between illumination period duration and moving picture quality
Data Source
AI summary
A display control circuit and a display unit are provided. The display control circuit generates a sweep signal that is at a fixed voltage level for an arbitrary period. The display unit compares the magnitude of a signal voltage that is written by a data line drive circuit in accordance with display data and the magnitude of the sweep signal generated by the display control circuit, and exercises illumination/nonillumination control in accordance with the comparison result.