Pixel Driving Chip Segmented Gray Scale Control
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Solution Overview
Problem
Current driving methods for LED display devices face challenges such as high power consumption, display flicker, and complexity in controlling current gradients and wavelength shifts, especially when adjusting brightness or gray scale, due to the need for precise current control and high-frequency oscillations.
Innovation Solution
A pixel driving chip with a data input circuit, time selection circuit, and current control circuit that partitions display data into multiple segments based on gray scale demarcation points, determining output durations and driving currents to achieve segmented gray scale driving, thereby reducing current gradients and improving control accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If current driving mode is used for LED display, then self-illumination and low energy consumption are achieved, but control precision deteriorates due to susceptibility to transistor turn-on voltage, carrier mobility and circuit voltage drop
Solution Approach 1:
The display data range is segmented into M data partitions based on gray scale demarcation points, with each partition corresponding to a specific output duration. This segmentation allows different gray scale ranges to be controlled with different time parameters, improving control precision while maintaining current driving mode efficiency.
Solution Approach 2:
The patent changes the control parameter from pure current magnitude to a combination of current magnitude and output duration. By adjusting both parameters, the system achieves finer control over display brightness while compensating for variations in transistor characteristics and circuit voltage drop.
2Illumination intensity
If precise current control is implemented to adjust brightness, then display quality improves, but device complexity increases due to need for high-frequency oscillations and complex control circuits
Solution Approach 1:
The time selection circuit is divided into M sub-circuits, each corresponding to a specific data partition and output duration. This segmentation simplifies the control logic by assigning dedicated time control to each gray scale range, avoiding the need for complex high-frequency oscillation control while achieving precise brightness adjustment.
Solution Approach 2:
The patent uses periodic output durations corresponding to different data partitions to control brightness. Instead of using complex high-frequency oscillations, the system varies the duration of current pulses in a periodic manner, achieving precise brightness control with simpler circuitry.
3Measurement precision
If display data is partitioned into multiple segments with different output durations, then control accuracy improves, but device complexity increases due to additional circuits
Solution Approach 1:
The pixel driving chip integrates multiple functions into a single device: data input circuit for receiving and partitioning display data, time selection circuit for determining output durations, and current control circuit for generating driving currents. This multi-functionality achieves high control accuracy without requiring separate external circuits for each function.
Solution Approach 2:
The patent merges the data processing, time control, and current generation functions into an integrated pixel driving chip. By combining these functions, the system achieves precise control accuracy while reducing overall system complexity compared to using separate discrete circuits.
Data Source
AI summary
A pixel driving chip and a driving method therefor, and a display apparatus. The pixel driving chip includes a data input circuit, a time selection circuit, and a current control circuit; the data input circuit is configured to receive display data, and partition the display data to obtain a data partition to which the display data belongs in M data partitions that are obtained on the basis of a display data range; the time selection circuit is configured to determine, according to the data partition to which the display data belongs, an output time length corresponding to the display data, and within the output time length, output the display data to the current control circuit; the current control circuit is configured to determine, according to the display data, a driving current flowing through a light emitting element corresponding to the display data.