Liquid Crystal Display Overdrive Circuit for Stereoscopic Uniformity
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Solution Overview
Problem
Liquid crystal display devices face issues with display unevenness and increased power consumption when performing stereoscopic displays, particularly at higher vertical scanning frequencies, and struggle with cross-talk between frames, which degrades image quality and requires increased power for both stereoscopic and planar display modes.
Innovation Solution
A liquid crystal display device that alternates the polarity of display signals every two or four vertical scanning periods, with a circuit capable of supplying display voltages corresponding to specific gradation levels, and includes a backlight unit with independently controllable illuminating regions to optimize luminance and reduce power consumption by switching between stereoscopic and planar display modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the liquid crystal display device is driven at higher vertical scanning frequencies to enable stereoscopic display, then the time period for displaying left-eye and right-eye frames is extended, but the time period for which each pixel is selected is shortened, increasing signal delay influence and causing display unevenness
Solution Approach 1:
The patent applies preliminary action by performing overdrive processing in advance to compensate for signal delay effects. The display signal is adjusted beforehand to account for the shortened pixel selection time at high vertical scanning frequencies, ensuring that the liquid crystal molecules reach the desired state despite the reduced time available for signal application.
Solution Approach 2:
The patent changes parameters by dynamically adjusting the display signal characteristics based on the vertical scanning frequency. When operating at higher frequencies for stereoscopic display, the signal parameters are modified to compensate for the reduced pixel selection time, maintaining display uniformity across different operating conditions.
2Adaptability or versatility
If the liquid crystal display device performs both stereoscopic display and planar display modes, then the versatility is improved, but the power consumption is increased
Solution Approach 1:
The patent applies dynamics by enabling the liquid crystal display device to dynamically switch between different display modes (stereoscopic and planar) and operating frequencies. The device can adapt its vertical scanning frequency and display signal characteristics based on the current mode, optimizing power consumption for each mode while maintaining versatility.
Solution Approach 2:
The patent implements multi-functionality by designing the liquid crystal display device to support both stereoscopic and planar display modes using the same hardware infrastructure. The device can operate in different frequency ranges and display configurations, providing universal functionality without requiring separate dedicated systems for each mode.
3Productivity
If the response of liquid crystal is slow in stereoscopic display, then the image from the previous frame affects the current frame, degrading stereoscopic display quality
Solution Approach 1:
The patent applies preliminary action by implementing overdrive processing that anticipates and compensates for liquid crystal response delays before they affect image quality. The display signal is pre-adjusted to ensure that the liquid crystal molecules reach their target state within the available time, preventing previous frame images from interfering with current frame display.
Solution Approach 2:
The patent applies the skipping principle by rushing through the liquid crystal response process using overdrive voltages that accelerate the molecular reorientation. This allows the liquid crystal to complete its response within the shortened time periods required for high-speed stereoscopic display, skipping past the problematic delay period where cross-talk would occur.
Data Source
AI summary
A liquid crystal display device of the present invention has a vertical scanning period in which the polarity of a display signal is positive and a vertical scanning period in which the polarity of a display signal is negative. When a pair of successive two vertical scanning periods is constituted by a first vertical scanning period and a second vertical scanning period, and when a target gradation level to be displayed in the first vertical scanning period is GL1, and a target gradation level to be displayed in the second vertical scanning period immediately after the first vertical scanning period is GL2, GL1 and GL2 being integers of 0 or more representing gradation levels, the liquid crystal display device includes a circuit (124) capable of supplying a display voltage corresponding to a gradation level to a pixel in the second vertical scanning period, the gradation level being expressed by GL2OD which satisfies a condition where |GL2OD-GL1| is larger than |GL2-GL1|, in the case where GL2 is different from GL1. The value of GL2OD when the polarity in the first vertical scanning period is positive and the polarity in the second vertical scanning period is negative is different from the value of GL2OD when the polarity in the first vertical scanning period is negative and the polarity in the second vertical scanning period is positive.