Thomson-Lcd

Deutsche Thomson-Brandt Gmbh

Thomson Consumer Electronics S.a.

Bernard Hepp

Bruno Mourey

Eric Benoit

Antoine Dupont

Eric Sanson

Michael Maier

Nicolas Szydlo

Pascal Royer

Direct multilevel thin-film transistors production method

This invention concerns active matrix flat displays in which the pixels (10) are placed at the intersections between two mutually-perpendicular sets of conductors known as lines (L1 to LN) and columns (C1 to CM). In the invention, each pixel consists of two capacitors (CON1, CON'1) connected in series and consisting of electro-optical components, this circuit being connected between two control transistors (T1, T'1), these two transistors being connected to a common line (L1) and two different columns (C1, C'1) respectively.

Active matrix flat display

The present invention is a video drive apparatus of the two ramp type which includes facility to selectively adjust the brightness and/or the contrast of an image reproduced on a display device. In this apparatus, at least one of the ramp signals is generated digitally by for example a counter. Provision is made to change the counting rate of such counter which effects a change in display contrast. Provision is also made to selectively change the phase of the ramp signal applied to the second stage relative to the start of respective pulses of the PWM signal thereby effecting brightness changes in the reproduced image.

Apparatus for providing contrast and/or brightness control of a video

Disclosed is a color matrix screen with colored filters in a triad or delta layout. In this layout, the pixels are formed by two adjacent sub-pixels that are aligned along the lines and columns of the matrix, the colored filters of the lines n (n may be odd or even) being arranged according to the sequence A,A, B,B, C,C and the colored filters of the lines n+1 being arranged according to the sequence C,C, A,A, B,B where A,B,C is any combination of red, green, blue with the offset of a sub-pixel at each end of the line, and wherein each column is constituted by two parallel column elements connected to each other at each end, two adjacent sub-pixels of a line with colored filters of a same color being each connected to a different column element Application to liquid crystal screens.

Color matrix screen with colored filters in a triad or delta layout with

An actuation circuit for a liquid crystal display includes a plurality of pixel elements constructed in the form of a matrix of columns and rows and a plurality of column capacitors connected to respective columns of the liquid crystal display that can be charged to store a signal to be displayed. The activation circuit comprises a number of blocks which each comprise a separate group of the columns forming the matrix of pixel elements, a corresponding number of column capacitors, and a plurality of data lines. The individual data lines receive respective signals and are connected to the column capacitors. A switch device is connected to each respective block for successively switching between the number of blocks. The signal to be displayed is fed in parallel through the data lines of the columns of a first block to charge respective column capacitors of the first block and after the charging of the column capacitors in the first block, the input lines are switched by the switch device to the data lines of the columns of the next-following block.

Actuating circuit for a liquid crystal display

Growing community of inventors

Sevres, France

Bernard Hepp