3D Display Driving Method Using Black Reset Frames
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Solution Overview
Problem
Existing image display systems suffer from 3D crosstalk and luminance deviations due to the response delay of liquid crystals when generating 3D images, which are not effectively addressed by existing over driving control (ODC) methods.
Innovation Solution
The method involves inserting a reset frame displaying black data between neighboring frames, reflecting gray-scale information of the (n-2)th frame in the (n-1)th reset frame, detecting data variations, and modulating input data using compensation values from a lookup table, while inverting data polarity according to N frame inversion to apply it to the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If existing over driving control (ODC) methods are applied to improve liquid crystal response characteristic, then response time is improved, but luminance deviation and 3D crosstalk occur due to black data frame insertion
Solution Approach 1:
The patent applies preliminary action by inserting a black data frame before the target frame to pre-reset the liquid crystal molecules. This prepares the liquid crystal in advance for the upcoming frame transition, ensuring faster response without causing luminance deviation in the target frame itself. The black frame serves as a preparatory step that eliminates residual effects from previous frames.
Solution Approach 2:
The black data frame acts as an intermediary element between consecutive color frames. It mediates the transition by providing a neutral state that resets the liquid crystal without directly affecting the luminance of the target display frame. This intermediary frame absorbs the response delay issue without transferring it to the visible image quality.
2Stability of the object's composition
If black data frame is inserted before target frame to improve response, then motion blurring is reduced, but initial luminance deviation occurs due to liquid crystal response delay
Solution Approach 1:
The black data frame is inserted in advance before the target frame to perform the reset operation preliminarily. This ensures that when the target frame is displayed, the liquid crystal has already been reset and will respond accurately to the target frame's luminance requirements, eliminating initial luminance deviation.
Solution Approach 2:
The patent rushes through the black frame display period quickly, using it only as a brief transition state. The system skips over potential luminance issues during the black frame by designing the ODC to compensate for the black frame's effect, thereby rushing through the problematic transition period without affecting the target frame's luminance accuracy.
3Speed
If ODC modulates current frame data based on previous frame data variation, then response characteristic is improved, but 3D crosstalk occurs when left-eye and right-eye images switch
Solution Approach 1:
The black data frame is inserted preliminarily before each eye's image frame to reset the liquid crystal state. This preliminary reset ensures that when switching between left-eye and right-eye images, the liquid crystal starts from a known neutral state, preventing crosstalk caused by residual effects from the previous eye's image.
Solution Approach 2:
The black data frame serves as an intermediary between left-eye and right-eye frames. It mediates the rapid switching by providing a neutral transition state that prevents direct interaction between the two eye images, thereby eliminating 3D crosstalk while maintaining fast frame switching speed.
4Manufacturing precision
If multiple compensation values are stored for different gray-scale variations, then luminance accuracy is improved, but device complexity increases due to larger memory requirements
Solution Approach 1:
The patent applies local quality by creating separate lookup tables for different frame types (color frames and black frames). Each lookup table contains compensation values optimized for its specific frame type, providing locally accurate compensation without needing a single large table containing all possible compensation scenarios.
Solution Approach 2:
The compensation memory is segmented into multiple smaller lookup tables based on frame type. Instead of one large memory containing all compensation values, the system divides it into separate tables for color frames and black frames, reducing the complexity of any single table while maintaining overall luminance accuracy.
Data Source
AI summary
A method of driving an image display device comprises inserting a reset frame displaying black data between neighboring data frames alternately displaying left-eye data and right-eye data; reflecting gray-scale information of an (n−2)th data frame in a reset frame corresponding to an (n−1)th frame through a predetermined data calculating operation; detecting a data variation between the (n−1)th reset frame and an nth data frame, reading a compensation value corresponding to the detection result from a lookup table, and modulating input data of the nth data frame using the read compensation value; and inverting the polarity of the modulated data according to N frame inversion (N is a multiple of 4) and applying the data having the inverted polarity to a display panel.