LCD Light Source Panel with Concave LED Areas

The patent extracts and removes the light guide plate and optical sheets from the backlight unit, retaining only the essential light emitting devices mounted directly on the substrate. This extraction eliminates the thick optical path components while preserving the core light emission function and partial luminance control capability through direct LED control

The patent transitions from a conventional backlight architecture requiring multiple layered optical components to a direct-emission architecture where light emitting devices are mounted directly on the substrate surface. This dimensional simplification reduces the optical path length and eliminates the need for thick light guide plates and optical sheets, achieving thinness without sacrificing luminance control

The patent applies local quality by controlling individual light emitting devices or small groups of devices independently through separate control circuits. This allows each region to be optimized for uniform light distribution, compensating for the absence of diffusing optical sheets while maintaining overall luminance uniformity across the display surface

The patent segments the backlight unit into multiple independently controllable light emitting device regions, each with its own control circuit. This segmentation enables precise local adjustment of light emission to achieve uniform luminance distribution without requiring thick optical diffusion layers, thus maintaining thinness while improving uniformity