| 摘要 |
<p>#CMT# #/CMT# The method involves applying a line selection voltage (VLS) to a line and a voltage to a column related to a grey level, during a line selection time (Tl) that is subdivided into groups according to a non-linear law with a transfer function close to the inverse of a gamma correction transfer function. The column voltage takes a value of one of two voltages throughout one group or switches from one voltage to the other during the group. #CMT# : #/CMT# The grey level is numerically coded according to the gamma transfer function based on the perception of the eye. The column voltage is selected among voltages (Vc0-Vc4) that are distributed in pairs. An independent claim is also included for a device for controlling a matrix display screen. #CMT#USE : #/CMT# Used for controlling a matrix display screen such as electron source flat screen, of a high definition television (HDTV) or personal computer, that is utilized to display video type images. #CMT#ADVANTAGE : #/CMT# The method utilizes time modulation of the voltage to be applied to the column, so that the columns receive less information to be managed for the same image quality and the utilization of time is optimized. The method can increase the duration between switching while reducing the capacitive consumption, by minimizing voltage transitions applied to the columns during the changeover from one line to the next line. The voltage values to be applied to the columns, are predefined so as to obtain a uniform brightness response. The utilization of the transfer function of the gamma correction law that transforms a linearly varying light intensity into a non-linear video signal, provides accurate perception of the human eye. The method makes the response of the display screen to be compatible with non-linear coding such as gamma correction, and reduces a number of bits to be used to control the screen. The method permits to display a continuum of grey levels in accordance with the response curve of the human eye without a large increase in the number of samples to be processed. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows signals to be applied to a line and a column of a matrix display screen for displaying a grey level. Tl : Line selection time T1, T2 : Groups of time intervals Vc0-Vc4 : Column voltages VLNS : Non selection voltage VLS : Line selection voltage `(Drawing includes non-English language text)`.</p> |
