US Patent No. 9,530,361

DRIVING DEVICE AND DRIVING METHOD FOR CONTROLLING BACKLIGHT OF DISPLAY DEVICE


Patent No. 9,530,361
Issue Date December 27, 2016
Title Driving Device And Driving Method For Controlling Backlight Of Display Device
Inventorship Katsuyuki Matsui, Tokyo (JP)
Assignee NEC Display Solutions, Ltd., Tokyo (JP)

Claim of US Patent No. 9,530,361

1. A driving device configured to change a quantity of light emitted from a backlight based on a predetermined BL-drive value,
comprising:
a drive normalization part configured to calculate a reference light quantity measurement representing a light quantity measurement
which is estimated and obtained from an optical sensor when the backlight is driven using a predetermined reference BL-drive
value at a current time based on a current BL-drive value, representing a BL-drive value at the current time, and a light
quantity measurement, representing a numerical value of a light quantity of the backlight driven by the current BL-drive value,
which is obtained from the optical sensor;

a low-pass filter configured to calculate a moving average among a plurality of reference light quantity measurements being
temporarily held, thus outputting a smoothed reference light quantity measurement precluding noise; and

a BL-drive value calculation part configured to calculate a target BL-drive value representing a BL-drive value which allows
the smoothed reference light quantity measurement to match a target light quantity based on the smoothed reference light quantity
measurement and the target light quantity based on a user's setting of luminance.