Light Filter Structure for Optical Fingerprint Identification in Display Panels

The patent applies local quality by introducing a light filter structure specifically in the light-transmitting hole of the light-shielding layer, which is the precise location where light enters the fingerprint identification module. This localized filtering mechanism targets only the harmful red and near-infrared wavelengths while preserving the display's overall optical characteristics and integration capabilities.

The light filter structure acts as an intermediary element between the external environment and the light sensor. It mediates the interaction by selectively filtering out harmful wavelengths (red light and near-infrared light) before they reach the light sensor, thus protecting the fingerprint identification function from environmental interference while maintaining display performance.

The patent merges the light filter structure with the existing light-shielding layer by positioning the filter within the light-transmitting hole of this layer. This integration combines the light-shielding function with the light-filtering function into a single structural element, avoiding the need for separate complex filtering mechanisms and thus minimizing the increase in device complexity.

The light filter structure utilizes optical filtering principles to selectively transmit or block specific wavelengths of light. By controlling the optical properties (color characteristics) of the filter material, the patent achieves wavelength-selective transmission without requiring complex mechanical or electronic control mechanisms, thereby simplifying the overall device structure.