Micro-LED Display Pixel Circuit Grayscale Control

The pixel circuit is divided into functional modules: drive device for current control, first light-emitting control device for timing control, and second light-emitting control device for grayscale adjustment. This segmentation allows each module to perform a specific function with simple structure, avoiding the need for a single complex active drive circuit while achieving precise grayscale control through coordinated operation of multiple simple devices.

The patent introduces a new control dimension by adding the second light-emitting control device that operates independently from the traditional active drive path. This creates a dual-control mechanism where grayscale is adjusted through the combination of drive device current control and the additional timing control from the second device, effectively adding a dimensional degree of freedom to grayscale adjustment without increasing individual device complexity.

The first and second light-emitting control devices are integrated into the pixel circuit structure and share control pathways with the drive device. The signal lines for these control devices are merged with existing pixel circuit interconnects where possible, reducing the total number of independent signal lines. The first light-emitting control signal line and second light-emitting control signal line are arranged to intersect and share routing resources, minimizing signal line quantity while maintaining reliable connections.

The signal lines in the pixel circuit are designed to serve multiple functions. For example, the same signal line infrastructure is used for both driving the light-emitting element and for controlling the timing and grayscale through the first and second light-emitting control devices. This multi-functionality reduces the need for dedicated separate signal lines for each control function, thereby reducing overall signal line quantity while maintaining connection reliability.

By segmenting the control functions into separate devices (drive device for current, first control device for timing, second control device for grayscale), each device can be implemented with simple, standardized circuit structures that are cost-effective to manufacture. This segmentation avoids the need for complex custom circuits that would require expensive manufacturing processes, while still achieving high precision grayscale control through the coordinated action of multiple simple devices.

The patent achieves precise grayscale control by changing operational parameters (light-emitting duration, current magnitude) rather than by increasing circuit complexity. The first and second light-emitting control devices manipulate temporal and current parameters to achieve grayscale adjustment, which can be done with simple switching and timing circuits that are inexpensive to manufacture, rather than requiring complex analog or digital control circuits.