Off-Axis Light-Emitting Device for Uniform Image Brightness

The patent applies asymmetry by offsetting the optical element from the geometric center of the light-emitting chip. This creates an off-axis light emission pattern that shifts the bright area from the center toward the corner region, compensating for the brightness non-uniformity. The asymmetric positioning allows light energy to be redistributed more evenly across the image sensor surface, improving overall brightness uniformity while utilizing more of the generated light energy.

The patent introduces a dimensional offset in the lateral direction (perpendicular to the optical axis) by positioning the optical element's geometric center at a distance from the light-emitting chip's geometric center. This lateral displacement creates an off-axis emission pattern that projects light toward the corner region, effectively using spatial dimensionality to redistribute light energy and achieve more uniform brightness distribution across the image.

Instead of tilting the LED chips or using complex optical systems, the patent employs a simple asymmetric positioning approach by offsetting the optical element from the chip center. This maintains the simplicity of the LED chip itself (no tilting required) while achieving brightness compensation through the lateral displacement of the optical element, thereby avoiding increased structural and circuit design complexity.

The patent uses a conventional LED chip structure without modification, copying the proven design, and simply offsets its optical element. This approach leverages the existing mature LED chip design and manufacturing processes, avoiding the need for complex tilted structures or specialized circuit designs, thus maintaining ease of manufacture while achieving improved brightness uniformity.

The patent uses lateral offset positioning to redirect light energy from the over-illuminated central region toward the under-illuminated corner region. By shifting the optical element's position in the lateral dimension, the light emission pattern is redistributed across the image sensor surface, allowing corner regions to receive more light energy and enabling fuller utilization of the total light energy generated by the LED.

The patent applies local quality by creating a non-uniform light emission pattern that directs enhanced illumination specifically toward the corner region where brightness is deficient. The optical element's offset position creates a localized brightness enhancement in the corner area while maintaining acceptable brightness in the central region, thereby distributing light energy more effectively across different regions of the image sensor.