Display Defect Compensation Circuit Using Segmented Dithering
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Solution Overview
Problem
Video display devices face challenges in compensating for display defects caused by exposure light deviations during the thin film pattern formation process, leading to noise issues due to collisions between different dither patterns, and require excessive memory capacity and increased manufacturing costs for various input sources and models.
Innovation Solution
A video display device with a compensation circuit that uses a first compensator to address defects on the display panel, a second compensator for fine adjustments, and a timing controller with a dithering unit to prevent pattern collisions, reducing noise and memory requirements by employing dither patterns of varying sizes based on input data and source types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a dithering circuit is used to finely adjust brightness differences, then display quality is improved, but noise is generated due to collision between dither patterns
Solution Approach 1:
The patent divides the dithering operation into two separate stages: a first dithering circuit that applies a first dither pattern, and a second dithering circuit that applies a second dither pattern. By segmenting the dithering process, the patent prevents pattern collision noise while achieving fine brightness adjustment through cumulative dithering effects.
2Measurement precision
If separate compensation circuits are used for different input sources and models, then compensation accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent designs a universal compensation circuit that can handle multiple input sources (8-bit, 10-bit, 12-bit data) and different display models through a single integrated architecture. The circuit uses selectable dither patterns and configurable compensation parameters to adapt to various input types, eliminating the need for separate compensation circuits for each input source or model.
3Adaptability or versatility
If all compensation data pieces for various input sources and models are stored, then compensation completeness is improved, but memory capacity and task complexity increase excessively
Solution Approach 1:
The patent stores a single set of compensation data pieces that can be applied to multiple input sources and models by changing parameters such as dither pattern selection, data bit depth configuration, and compensation intensity. This parameter-based adaptation allows the system to achieve comprehensive compensation coverage without storing separate compensation data for each input type or model.
Data Source
AI summary
A video display device includes a display panel; a memory storing defect information for compensating data to be displayed on defect regions of the display panel; a compensation circuit comprising a first compensator that compensates the data to be displayed on the defect regions using the defect information from the memory, and a second compensator that finely compensates the data compensated by the first compensator using a first dither pattern, the compensation circuit supplying data to be displayed on normal regions without compensation; a timing controller comprising a dithering unit for finely compensating data output from the compensation circuit, using a second dither pattern having a size larger that a size of the first dither pattern; and a panel driver for driving the display panel under a control of the timing controller.