Method of improving the luminous efficiency of a sequential-colour matrix display
First Claim
1. Method of improving the luminous efficiency of a sequential-colour matrix display, the display being driven using an addressing method of the pulse width modulation or PWM type, characterized, for each pixel of a subframe, by the following steps:
- comparison of the pixel colour value of the preceding subframe with a reference value so as to provide an overlap value depending on the period of overlap with the current subframe;
if the pixel colour value of the current subframe less the overlap value gives a positive value, a time offset is to be added to the pixel colour value of the current subframe;
if the pixel colour value of the current subframe less the overlap value gives a negative value, the pixel colour value of the current subframe is forced to be zero.
4 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a method of improving the luminous efficiency of a sequential-colour matrix display, the display being driven using an addressing method of the pulse width modulation or PWM type. This method comprises, for each pixel of a subframe, the following steps: comparison of the pixel colour value of the preceding subframe with a reference value so as to provide an overlap value depending on the period of overlap with the current subframe; if the pixel colour value of the current subframe less the overlap value gives a positive value, a time offset is added to the pixel colour value of the current subframe; if the pixel colour value of the current subframe less the overlap value gives a negative value, the pixel colour value of the current subframe is forced to be zero. The invention applies to LCOS or LCD displays.
18 Citations
8 Claims
-
1. Method of improving the luminous efficiency of a sequential-colour matrix display, the display being driven using an addressing method of the pulse width modulation or PWM type, characterized, for each pixel of a subframe, by the following steps:
-
comparison of the pixel colour value of the preceding subframe with a reference value so as to provide an overlap value depending on the period of overlap with the current subframe;
if the pixel colour value of the current subframe less the overlap value gives a positive value, a time offset is to be added to the pixel colour value of the current subframe;
if the pixel colour value of the current subframe less the overlap value gives a negative value, the pixel colour value of the current subframe is forced to be zero. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification