Light Emitting Apparatus

What is this patent about?

’436 is related to the field of light emitting devices (LEDs), specifically addressing the need for improved lighting efficiency and uniformity in applications like lamps and backlights. Traditional LED lighting solutions often suffer from limited lighting angles and light loss due to reflection, requiring more LED chips and increasing costs. The patent aims to overcome these limitations by utilizing a novel arrangement of LED chips and wavelength conversion layers.

The underlying idea behind ’436 is to create a light emitting apparatus with enhanced light extraction and color uniformity. This is achieved by using a transparent substrate with LED chips mounted on one side, coupled with wavelength conversion layers on both sides of the substrate. The light emitted by the LEDs penetrates the substrate and is partially converted by the wavelength conversion layers, resulting in a more uniform and efficient light output from both sides of the device.

The claims of ’436 focus on a light emitting apparatus comprising a first light emitting device with a transparent substrate, multiple LED chips on one surface, and wavelength conversion layers on both surfaces. A second light emitting device, physically separated from the first, is also included. The first and second light emitting devices are connected to a support base at different angles, with a support structure between the base and the first light emitting device. The wavelength conversion layers are in direct contact with the LED chips and the substrate.

In practice, the LED chips emit light that passes through the transparent substrate. The wavelength conversion layers, containing fluorescent materials, then convert a portion of this light to different wavelengths, improving the color rendering and uniformity of the emitted light. The arrangement of the two light emitting devices at different angles relative to the support base allows for tailoring the light distribution pattern, making it suitable for various lighting applications. The transparent substrate allows light to exit from both sides of the device, increasing overall light output.

This design differentiates itself from prior approaches by utilizing wavelength conversion layers on both sides of the substrate, maximizing light extraction and color mixing. The separation of the two light emitting devices and their angled mounting on the support base provide greater flexibility in controlling the light distribution. The use of a transparent substrate allows for omni-directional light emission , addressing the limitations of traditional planar LED arrangements with reflective mechanisms. The first support between the support base and the first light emitting device provides mechanical stability.