Display Correction Data Bit Shift Overflow Handling
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Solution Overview
Problem
Display devices face challenges in representing and storing correction values outside the limited range of correction data, leading to inadequate mura correction due to fixed bit numbers, resulting in non-uniform luminance and mura defects.
Innovation Solution
A method is introduced to generate correction data by capturing images, determining frequency and adjacency criteria for overflow correction values, and selectively performing bit shift operations to expand the representable range, storing bit shift information for optimal correction data storage and mura correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If correction data with limited bits is used to store correction values, then the storage capacity is maintained within fixed limits, but correction values outside the limited range cannot be represented, resulting in inadequate mura correction
Solution Approach 1:
The correction data is segmented into multiple components: integer portion data, decimal portion data, and bit shift information. This segmentation allows the correction values to be represented in a expanded range by combining these segments with bit shift operations, resolving the limitation of fixed-bit storage while maintaining manageable data structures
Solution Approach 2:
The patent introduces a bit shift dimension to the correction data structure. By adding bit shift information and performing bit shift operations, the correction values can represent a wider range of values beyond the original fixed-bit limitation, effectively adding another dimension to the data representation capability
2Measurement precision
If bit shift operations are performed on all correction values to expand representation range, then the correction value range is expanded, but undesired bit shift operations may occur leading to reduced luminance uniformity
Solution Approach 1:
The patent applies bit shift operations selectively rather than uniformly across all correction values. By determining whether to perform bit shift operations on a local basis (for specific correction values based on overflow detection), the system expands the representation range only where needed while maintaining luminance uniformity in regions where bit shift operations are not required
Solution Approach 2:
The correction data structure is made dynamic through conditional bit shift operations. The system adapts the correction approach based on the specific characteristics of each correction value, performing bit shifts only when overflow is detected, thereby optimizing both the representation range and luminance uniformity
3Ease of manufacture
If correction data is stored without bit shift information, then the storage format is simple, but correction values outside the reference range cannot be properly represented
Solution Approach 1:
Bit shift information is prepared and stored in advance along with the correction data. This preliminary preparation enables the system to perform bit shift operations when needed without complex real-time calculations, maintaining storage simplicity while expanding the correction value representation capability
Data Source
AI summary
In a method of generating correction data for a display device, an image is captured, a plurality of correction values are obtained at a plurality of sampling positions based on the captured image, whether a frequency criterion about a total number of overflow correction values is satisfied is determined, the overflow correction values being the correction values outside at least one reference range whether an adjacency criterion about a number of the overflow correction values at sampling positions adjacent to a sampling position of the each of the overflow correction values is satisfied is determined, a bit shift operation is selectively performed on the plurality of correction values according to whether the frequency and/or adjacency criterion is satisfied, and correction data representing the plurality of correction values on which the bit shift operation is performed, and bit shift information about the bit shift operation are stored in the display device.