Scanning Backlight For a Matrix Display
First Claim
1. A scanning backlight unit (BU) for a matrix display (1), the scanning backlight unit (BU) comprising:
- a plurality of light sources (L1, . . . , Ln),a driver (2) for supplying drive signals (D1, . . . , Dn) to the light sources (L1, . . . , Ln),a controller (3) for controlling the driver (2) to separately activate the light sources (L1, . . . , Ln) to obtain light-emitting regions (5) being active, and a light sensor (4) being associated with a group of at least two of the light sources (L1, . . . , Ln) to supply a sensor signal (SES) indicating a luminance (LU) of the group to the controller (3),the controller (3) being arranged for reading the sensor signal (SES) at different instants (ts1, . . . , tsn) at which mutually different subsets of the light sources (L1, . . . , Ln) of the group are active, to control the driver (2) for supplying power levels to the light sources (L1, . . . , Ln) of the group for obtaining a luminance (LU1, . . . , LUn) of each one of the light sources (L1, . . . , Ln) of the group in dependence on the sensor signal (SES).
1 Assignment
0 Petitions
Accused Products
Abstract
A scanning backlight unit (BU) for a matrix display comprises a plurality of light sources (L1, . . . , Ln). A driver (2) supplies drive signals (D1, . . . , Dn) to the light sources (L1, . . . , Ln). A controller (3) controls the driver (2) to separately activate the light sources (L1, . . . , Ln) to obtain light-emitting regions (5) being active. A light sensor (4) is associated with a group of at least two of the light sources (L1, . . . , Ln) to supply a sensor signal (SES) which indicates a luminance (LU) of the group. The controller (3) reads the sensor signal (SES) at different instants (ts1, . . . , tsn) at which mutually different subsets of the light sources (L1, . . . , Ln) of the group are active to control the driver (2) to supply power levels to the light sources (L1, . . . , Ln) of the group to obtain a luminance (LU1, . . . , LUn) of each one of the light sources (L1, . . . , Ln) of the group in dependence on the sensor signal (SES).
111 Citations
22 Claims
-
1. A scanning backlight unit (BU) for a matrix display (1), the scanning backlight unit (BU) comprising:
-
a plurality of light sources (L1, . . . , Ln), a driver (2) for supplying drive signals (D1, . . . , Dn) to the light sources (L1, . . . , Ln), a controller (3) for controlling the driver (2) to separately activate the light sources (L1, . . . , Ln) to obtain light-emitting regions (5) being active, and a light sensor (4) being associated with a group of at least two of the light sources (L1, . . . , Ln) to supply a sensor signal (SES) indicating a luminance (LU) of the group to the controller (3), the controller (3) being arranged for reading the sensor signal (SES) at different instants (ts1, . . . , tsn) at which mutually different subsets of the light sources (L1, . . . , Ln) of the group are active, to control the driver (2) for supplying power levels to the light sources (L1, . . . , Ln) of the group for obtaining a luminance (LU1, . . . , LUn) of each one of the light sources (L1, . . . , Ln) of the group in dependence on the sensor signal (SES). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A method of illuminating a matrix display (1) with a scanning backlight unit (BU) comprising light sources (L1, . . . , Ln) and a light sensor (4) being associated with a group of at least two of the light sources (L1, . . . , Ln) to supply a sensor signal (SES) indicating a luminance at a position of said sensor (4), the method comprises
supplying (2) drive signals to the light sources (L1, . . . , Ln) to separately activate the light sources (L1, . . . , Ln) to obtain light-emitting regions (5) being active, reading (3) the sensor signal (SES) at different instants (ts1, . . . , tsn) at which a different subset of the light sources (L1, . . . , Ln) of the group are active, and controlling (3) the supplying (2) to supply power levels to the light sources (L1, . . . , Ln) of the group for obtaining a luminance (LU1, . . . , LUn) of each one of the light sources (L1, . . . , Ln) of the group in dependence on the sensor signal (SES).
Specification