Scan Line Compensation for Display Luminance Uniformity

The patent applies local quality by making different parts of the scan lines have different properties. Specifically, the scan lines have different lengths in different regions (first scan line is shorter, second and third scan lines are longer), and compensation lines are selectively added to certain scan lines (second and third compensation lines) but not others (first compensation line omitted). This local differentiation compensates for the luminance deviation caused by the reduced non-display region while maintaining the overall compact design.

The patent changes the parameter of scan line length to address the luminance deviation issue. The second scan line and third scan line are extended to be longer than the first scan line, which compensates for the increased luminance deviation in regions adjacent to the optical signal transmission region. This parameter change allows the display device to maintain uniform luminance across different regions despite the reduced non-display region area.

The patent introduces compensation lines as intermediary elements to balance the resistance differences caused by extended scan lines. The second compensation line is electrically connected to the second scan line, and the third compensation line is electrically connected to the third scan line. These compensation lines act as mediators that equalize the potential distribution and reduce the impact of resistance differences, ensuring reliable electrical connection while maintaining manufacturing precision.

The patent achieves equipotentiality by adding compensation lines to certain scan lines. The second compensation line connected to the second scan line and the third compensation line connected to the third scan line create equipotential regions that balance the voltage distribution across the display panel. This eliminates the potential differences that would otherwise arise from the unequal lengths of scan lines, ensuring uniform electrical characteristics.

The patent employs composite material structure in the display panel, particularly in the encapsulation layer configuration. The encapsulation substrate includes a first encapsulation layer and a second encapsulation layer with different thicknesses in different regions. The first encapsulation layer has uniform thickness providing structural strength, while the second encapsulation layer has reduced thickness in the optical signal transmission region to improve light transmittance. This composite structure simultaneously achieves both optical performance and mechanical strength.

The patent applies local quality by creating different thickness regions within the encapsulation structure. The second encapsulation layer has a first region with greater thickness (providing structural strength) and a second region with smaller thickness (providing high light transmittance). This local differentiation allows the display device to have both strong structural integrity and excellent optical performance in the signal transmission region.