Hybrid Display Panel Driving Circuit for Grayscale Control
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Solution Overview
Problem
Current digital driving modes for display panels require a large number of subframes to achieve the same grayscale display, leading to increased data transmission and difficulties in implementing higher resolutions and refresh rates.
Innovation Solution
The proposed display panel incorporates a mirror current receiving module and a digital driving module, allowing for a hybrid driving mode where light-emitting current is controlled through mirror current receiving units and light-emitting time is adjusted by digital driving units, reducing the number of subframes required for grayscale display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital driving mode is used to adjust light-emitting luminance by adjusting light-emitting time, then grayscale control precision is improved, but the number of subframes required increases
Solution Approach 1:
The pixel circuit is divided into multiple light-emitting subloops (first, second, third subloops) that can be independently controlled by separate digital driving units. Each subloop corresponds to a specific subframe, allowing grayscale to be constructed by selectively activating different subloops in different subframes rather than requiring many subframes for a single loop.
Solution Approach 2:
The invention introduces a spatial dimension by creating multiple parallel light-emitting subloops instead of using a single loop with multiple subframes. This transforms the time-based grayscale control (multiple subframes) into a spatial-parallel structure (multiple subloops), reducing the temporal overhead while maintaining grayscale precision.
2Measurement precision
If digital driving mode with multiple subframes is used, then grayscale display capability is improved, but data transmission amount increases
Solution Approach 1:
The grayscale control is segmented across multiple light-emitting subloops, each handled by a separate digital driving unit. This segmentation allows the data transmission to be distributed and optimized, reducing the total data burden compared to sequential subframe-based digital driving.
Solution Approach 2:
The invention merges digital driving control with analog light-emitting current adjustment within each subloop. The digital driving units control the timing and duration of light emission, while the analog current provides fine-grayscale adjustment, combining the advantages of both modes and reducing overall data requirements.
3Productivity
If multiple light-emitting subloops are used in parallel, then light-emitting efficiency is improved, but device complexity increases
Solution Approach 1:
Each light-emitting subloop is designed with similar structure and control mechanism, allowing the same circuit topology to serve multiple functions (different grayscale levels, different subframes). This modular universality reduces design complexity despite having multiple subloops, as each unit can be replicated from a standard template.
Data Source
AI summary
The present disclosure discloses a display panel and a display device. The display panel includes a pixel circuit. The pixel circuit includes a mirror current receiving module, a digital driving module, and a light-emitting module. The mirror current receiving module includes N mirror current receiving units. A control terminal of each N mirror current receiving unit is connected to one mirror current, and the N mirror current receiving units are respectively connected in series to light-emitting subloops. N is an integer greater than or equal to 2. The digital driving module includes N digital driving units respectively connected in series to the light-emitting subloops. The light-emitting module is connected to a light-emitting loop formed by the light-emitting subloops.