Patent ID: 9692946
Date: 2017-06-27
CPC Classifications: G09G,H04N

Claim:
1. An apparatus for reproducing the response of an emulated device including a circuit for generating video signals for a video display device that includes a liquid crystal display (LCD) layer and a backlight, said backlight comprising a set of light emitting diodes (LEDs) wherein each LED is configured to be individually modulated, the circuit comprising: a backlight generation circuit that generates a backlight control signal based on an input video signal, said input video data comprising a non-linear signal produced by gamma correcting recorded linear light image data, the backlight control signal comprising an average of the gamma corrected input video signal in the area around each LED; a backlight transfer function circuit that transforms the backlight control signal to a linear backlight control signal to drive each individual LED using pulse width modulation (PWM) signal calculated for each individual LED and further such that the backlight generates a low resolution image of the input video signal; a emulated device gamma response function circuit that converts the input video signal to a modified input video signal using a transfer function that corresponds to a emulated device response; a LCD correction circuit that generates a linear LCD transmissivity signal based on the modified input video signal and the light field simulation signal; a LCD modification circuit that modifies the linear LCD transmissivity signal, applying an inverse characterization of the LCD layer to generate the LCD control signal; and wherein the video display device according to the backlight control signal and the LCD control signal reproduces the response of the emulated device.