Display Gamma Voltage Mapping for Grayscale Brightness Accuracy
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Solution Overview
Problem
Existing display technologies face significant errors in brightness consistency due to uncertainties in semiconductor manufacturing processes, leading to deviations from the desired gamma curve and reduced display quality.
Innovation Solution
A display apparatus with a memory storing 2N grayscale data and register values in one-to-one correspondence, coupled with a driver to obtain and output grayscale voltages, ensuring precise correspondence between grayscales and luminance, using nonlinear interpolation to align with the gamma curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gamma correction is introduced to ensure consistency between displayed luminance and human vision requirements, then display effect is optimized, but manufacturing uncertainties cause deviations from the gamma curve
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correspondence relationships between grayscale values and voltage values in a lookup table during manufacturing. This pre-computed mapping compensates for manufacturing uncertainties by establishing a reference standard that subsequent operations can follow, ensuring consistent grayscale brightness while maintaining gamma curve adherence despite variations in manufacturing processes.
Solution Approach 2:
The patent implements feedback mechanisms through measurement and adjustment processes. After initial manufacturing, the system measures actual grayscale output and compares it against the gamma curve, then adjusts voltage values accordingly. This feedback loop continuously corrects deviations caused by manufacturing uncertainties, maintaining reliable gamma curve adherence while ensuring consistent display effect.
2Measurement precision
If more grayscale levels are used to improve brightness precision, then display quality improves, but the complexity of managing and calibrating grayscale values increases
Solution Approach 1:
The patent applies segmentation by dividing the grayscale range into discrete levels (e.g., 256 grayscale values from 0-255) and pre-computing corresponding voltage values for each level. This segmentation transforms the complex continuous calibration problem into a manageable discrete lookup table, reducing calibration complexity while maintaining high brightness precision through the detailed grayscale-voltage mappings.
Solution Approach 2:
The patent uses copying by creating a lookup table that stores pre-computed correspondence relationships between grayscale values and voltage values. Instead of performing complex real-time calculations for each grayscale level, the system copies the pre-computed mappings from the lookup table, significantly reducing computational complexity and calibration requirements while maintaining measurement precision through the stored reference data.
3Manufacturing precision
If real-time grayscale voltage adjustment is performed to correct brightness deviations, then display accuracy improves, but processing time and computational load increase
Solution Approach 1:
The patent applies preliminary action by pre-computing the correspondence relationships between grayscale values and voltage values during manufacturing and storing them in a lookup table. This eliminates the need for time-consuming real-time calculations, as the system can simply retrieve pre-computed values from the table during display operations, significantly reducing processing time while maintaining high brightness accuracy.
Solution Approach 2:
The patent uses copying by storing pre-computed grayscale-voltage correspondences in a lookup table that can be quickly accessed during display operations. Instead of performing complex real-time computations to determine appropriate voltage values, the system copies the pre-computed mappings from the lookup table, dramatically reducing computational load and processing time while preserving brightness accuracy through the reference data.
Data Source
AI summary
A display apparatus includes a display panel, a memory, and a driver. The memory stores at least one set of correspondences, and each set of correspondences includes 2N grayscale data and 2N register values in a one-to-one correspondence with the 2N grayscale data; each register value represents a grayscale voltage value of corresponding grayscale data; and N is a positive integer greater than or equal to 6. The driver obtains the at least one set of correspondences from the memory; receives image data from a signal transmission interface, the image data including a plurality of grayscale data corresponding to a plurality of sub-pixels; for any grayscale data in the image data, obtains a register value corresponding to the grayscale data in a set of correspondences; and outputs a grayscale voltage corresponding to a grayscale voltage value represented by the register value to the display panel according to the register value.