FR2661538A1 - Colour matrix screen with enhanced definition - Google Patents

Colour matrix screen with enhanced definition Download PDF

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Publication number
FR2661538A1
FR2661538A1 FR9005398A FR9005398A FR2661538A1 FR 2661538 A1 FR2661538 A1 FR 2661538A1 FR 9005398 A FR9005398 A FR 9005398A FR 9005398 A FR9005398 A FR 9005398A FR 2661538 A1 FR2661538 A1 FR 2661538A1
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FR
France
Prior art keywords
lines
characterized
matrix
screen
conductors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR9005398A
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French (fr)
Inventor
Mourey Bruno
Hepp Bernard
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Thomson-LCD
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Thomson-LCD
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Filing date
Publication date
Application filed by Thomson-LCD filed Critical Thomson-LCD
Priority to FR9005398A priority Critical patent/FR2661538A1/en
Publication of FR2661538A1 publication Critical patent/FR2661538A1/en
Application status is Withdrawn legal-status Critical

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Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2003Display of colours
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/04Structural and physical details of display devices
    • G09G2300/0439Pixel structures
    • G09G2300/0452Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0814Several active elements per pixel in active matrix panels used for selection purposes, e.g. logical AND for partial update
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0224Details of interlacing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/08Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels

Abstract

The screen of the invention, with filters of the same colour on the diagonal, includes two transistors (T1, T2) controlling the cells with filters of the same colour, at each intersection of conductors of the matrix of conductors (L1, L2,... and C1, C2,...). <IMAGE>

Description

ECRAN MATRICIEL; MATRIX SCREEN; COUIAJRS A DEFINITION AMELIOREXE COUIAJRS A DEFINITION AMELIOREXE
La présente invention se rapporte à un écran matriciel couleurs à définition améliorée. The present invention relates to a matrix color display enhanced definition.

Les écrans matriciels à cristaux liquides doivent, pour fonctionner correctement, être rafraîchis le plus fréquemment possible (au moins toutes les 20 ms), et la polarité de chacune des différentes cellules de la matrice doit également être alternée fréquemment. The liquid crystal matrix screens must, to function properly, be refreshed as often as possible (at least every 20 ms), and the polarity of each of the different cells in the array must also be alternated frequently.

Ces exigences peuvent être satisfaites avec des écrans à simple définition (280 lignes), mais si l'on veut doubler la définition (575 lignes), les techniques habituelles d'adressage ne sont pas satisfaisantes. These requirements can be met with screens to simple definition (280 lines), but if we want to double the resolution (575 lines), the usual addressing techniques are not satisfactory. En effet, une technique connue consiste à appliquer une polarité positive pendant une trame paire et une trame impaire (les lignes impaires étant adressées pendant la trame paire par exemple, et les lignes paires pendant la trame impaire), puis à appliquer une polarité négative pendant une deuxième trame paire et une deuxième trame impaire, et ainsi de suite. Indeed, a known technique is to apply a positive polarity during an even field and an odd field (odd lines being addressed during the even field, for example, and the even lines during the odd field), then applying a negative polarity during a second frame and a second pair odd field, and so on. La fréquence de rafraîchissement serait alors de 12, 5 Hz, ce qui conduirait à un papillotement inadmissible.Une autre technique consisterait à mémoriser toutes les informations correspondant à une trame à l'aide d'une mémoire d'image et d'adresser toutes les lignes de manière habituelle. The refresh rate would then be 12, 5 Hz, which would lead to a flicker inadmissible.Une another technique would be to store all information corresponding to a frame using an image memory and address all lines in the usual manner. Ceci augmenterait cependant sensiblement le coût du dispositif. However, this would significantly increase the cost of the device.

Une autre technique connue consiste à adresser les lignes deux à deux avec décalage d'une trame à l'autre (par exemple les lignes 1 et 2, 3 et 4, ... pendant une trame paire, puis les lignes 2 et 3, 4 et 5, ... pendant une trame impaire), et ce, en alternant la polarité toutes les deux trames. Another known technique consists in addressing the two lines with two shift of one frame to another (e.g. rows 1 and 2, 3 and 4, ... for one frame pair and the lines 2 and 3, 4 and 5, ... during an odd field), and that by alternating the polarity every two frames. Ainsi, chaque ligne est rafraîchie toutes les 20 ms, mais ce procédé complique l'adressage des lignes et ne peut être mis en oeuvre qu'avec des écrans dans lesquels chaque colonne ne comporte que des filtres de la même couleur à cause dudit décalage d'adressage d'une trame à la suivante. Thus, each row is refreshed every 20 ms, but this method complicates the addressing of the rows and may be implemented with screens in which each column contains only filters of the same color to cause said offset d addressing a frame to the next.

La présente invention a pour objet un écran matriciel à définition améliorée qui puisse être adressé simplement. The present invention relates to an improved definition matrix screen that can be simply addressed.

L'écran matriciel en couleurs conforme à l'invention comporte, à chaque intersection des lignes et colonnes de la matrice de conducteurs d'adressage deux transistors, chaque couple d'une ligne et d'une colonne commandant deux cellules à cristal liquide diagonalement opposées et coopérant avec des filtres de même couleur, l'adressage de l'écran étant entrelacé, les lignes impaires étant adressées pendant une trame, et les lignes paires étant adressées pendant la trame suivante. The matrix display color according to the invention comprises, at each intersection of rows and columns of the matrix address conductors two transistors, each pair of a row and a column commander two cells diagonally opposite liquid crystal and cooperating with the same color filters, the addressing of the screen being interlaced, the odd lines being addressed during a frame, and the even lines being addressed during the next frame.

L'invention sera mieux comprise à la lecture de la description détaillée d'un mode de réalisation, pris à titre d'exemple non limitatif et illustré par le dessin annexé, dont la figure unique est une vue simplifiée et partielle d'un écran matriciel en couleurs conforme à l'invention. The invention will be better understood from reading the detailed description of an embodiment, taken by way of example and illustrated by the accompanying drawing, the single figure is a simplified, partial view of a matrix screen colors in accordance with the invention.

L'invention est expliquée ci-dessous en référence à un écran matriciel à cellules de cristaux liquides, mais il est bien entendu quelle peut être mise en oeuvre pour réaliser des écrans matriciels à cellules faisant appel à des technologies autres que les cristaux liquides. The invention is explained below in reference to a liquid crystal cell matrix screen, but it is of course what can be implemented to achieve matrix screens using cells other than liquid crystal technology.

L'écran 1 représenté sur le dessin comporte une matrice de conducteurs de lignes L1, L2, L3, ... et de conducteurs de colonnes C1, C2, C3, ... The screen 1 shown in the drawing comprises a conductive array lines L1, L2, L3, ... and column conductors C1, C2, C3, ...

Chacune des "cases" délimitées par deux conducteurs de ligne voisins et deux conducteurs de colonne voisins comporte une cellule de cristal liquide. Each of the "boxes" delimited by two neighboring conductor line and two conductors of neighboring column has a liquid crystal cell. Ces cellules sont respectivement référencées X11 - X12 - X13 ... pour la première ligne de cellules (entre les conducteurs L1 et L2), X21 - X22 - X23 ... These cells are referenced respectively X11 - X12 - X13 ... for the first cell line (between the conductors L1 and L2), X21 - X22 - X23 ...

pour la deuxième ligne de cellules, et ainsi de suite. the second cell line, and so on.

La disposition des filtres colorés est en diagonale par rapport à la matrice, c 'est-à-dire que par exemple les filtres rouges (R) sont superposés aux cellules X11 - X22 - X33 ..., les filtres verts (V) aux cellules X21, X32 ... et X13, The arrangement of color filters is diagonally with respect to the matrix, that is to say that for example, red filters (R) are superimposed on the cells X11 - X22 - X33 ..., green filters (V) to X21 cells, X32 and X13 ...,
X24, ..., et les filtres bleus (B) aux cellules X12, X23, X34, ... X24, ..., and blue filters (B) to cells X12, X23, X34, ...

Selon l'invention, on forme, pour chaque cellule, non pas un, mais deux transistors de commande en des sommets opposés de la cellule, ces sommets opposés étant tous pris dans la même direction, à savoir celle des filtres de même couleur. According to the invention is formed, for each cell, not one, but two control transistors of opposite vertices of the cell, these opposite vertices are all taken in the same direction, namely that of the same colored filters.

Dans le cas présent, pour la cellule X11, ces sommets sont ceux définis, pour le premier, par l'intersection des conducteurs Ci et L1, et pour le second par l'intersection des conducteurs C2 et L2. In this case, for the X11 cell, these peaks are those defined for the first, by the intersection of the conductors Ci and L1, and the second by the intersection of C2 and L2 conductors. Pour simplifier le dessin, tous ces transistors, référencés Ti et T2 pour la cellule X11 ont été représentés par de simples traits joignant, près de chaque sommet considéré, un conducteur de ligne à un conducteur de colonne. To simplify the drawing, all of these transistors, labeled Ti and T2 for the X11 cell were represented by simple lines joining near each vertex considered, a conductor line to a column conductor. Ces transistors sont avantageusement des transistors TFT ("Thin Film These transistors are preferably TFT transistors ( "Thin Film
Transistors"). Ils sont fabriqués de façon habituelle. Transistors "). They are made in the usual way.

L'adressage des conducteurs de ligne se fait de manière entrelacée, les pixels de deux lignes consécutives étant à chaque fois adressés en même temps par l'application d'une tension VLoN sur la ligne Li située entre ces deux lignes de pixels, de la façon suivante : (les valeurs n que peut prendre i sont mises en indices pour améliorer la lisibilité, de même que les valeurs m concernant les valeurs des colonnes) The addressing of the row conductors is in an interleaved manner, the pixels of two consecutive lines in each case being sent simultaneously by applying a voltage on the Li Vlon line between the two rows of pixels, the as follows: (values ​​n i can take are set to improve readability indices, as well as the values ​​for m column values)
Trame impaire : adressage des lignes impaires L2n+1. odd field: address of the odd lines L2n + 1.

La ligne L2n+1 et la colonne Cm permettant aussi d'adresser à la fois le pixel X2n+1 m et le pixel X2n, m-1} diagonalement apairés donc de même couleur, par exemple l'adressage de la ligne L3 et de la colonne C2 active les pixels X21 et X32. The line L2n + 1 and Cm column also possible to address both the pixel X 2 n + 1 m and X2n pixel, m-1} diagonally apairés therefore of the same color, for example the addressing of the line L3 and active column C2 X21 and X32 pixels.

Trame paire adressage des lignes paires L2n La ligne L2n et la colonne C permettant d'adresser à la fois les Even field addressing of even lines L2n L2n The row and column C for addressing both
m pixels X et X2n-1, m-1, par exemple l'adressage X m pixels X and X 2 n-1, m-1, for example addressing X
2n,m 2n-l,m-1' par exemple l'adressage de la ligne 2n, 2n-m, m-1 ', eg the addressing of the line
L2 et de la colonne C3 permet d'activer les pixels bleus X12 et L2 and column C3 enables the X12 and blue pixels
X23. X23.

Ainsi, on obtient un écran matriciel de réalisation simple (la fabrication du deuxième transistor de chaque cellule se fait au cours du même processus que celle du premier transistor) et dont toutes les lignes de cellules fonctionnent même si l'un des deux transistors de chaque cellule est hors fonctionnement. Thus, one obtains a matrix screen simple embodiment (manufacture of the second transistor of each cell is made during the same process as that of the first transistor) and in which all the cell lines will operate even if one of the two transistors of each cell is not operating.

Claims (4)

REVENDICATIONS
1. Ecran matriciel couleurs à définition améliorée, caractérisé par le fait qu'il comporte, à chaque intersection des lignes (L1,L2, ...) et colonnes (C1,C2, ...) de la matrice de conducteurs d'adressage deux transistors (T1, T2), chaque couple de ligne (Ln) et colonne (Cm) commandant deux cellules à cristal liquide diagonalement opposées et coopérant avec des filtres de même couleur (Xn,m et Xn 1 m 1) 1. Matrix screen colors enhanced definition, characterized in that it comprises, at each intersection of lines (L1, L2, ...) and columns (C1, C2, ...) of the array of conductors address two transistors (T1, T2), each torque line (Ln) and column (Cm) controlling two liquid crystal cells diagonally opposite and cooperating with the same color filters (Xn, Xn and m 1 m 1)
2. Ecran selon la revendication 1, caractérisé par le fait que l'adressage de l'écran est entrelacé, les lignes impaires (L2n+i) étant adressées pendant une trame et les lignes paires (L2m) étant adressées pendant la trame suivante. 2. Screen according to claim 1, characterized in that the addressing of the display is interlaced, the odd lines (L2n + i) is addressed during a frame and the even lines (L2m) being addressed during the next frame.
3. Ecran selon la revendication 1 ou 2, caractérisé par le fait que les filtres colorés sont disposés en diagonale par rapport à la matrice de conducteurs. 3. Screen according to claim 1 or 2, characterized in that the color filters are arranged diagonally with respect to the conductive matrix.
4. Ecran selon l'une des revendications précédentes, caractérisé par le fait qu'il est du type à cristaux liquides. 4. A screen according to one of the preceding claims, characterized in that it is of the LCD type.
FR9005398A 1990-04-27 1990-04-27 Colour matrix screen with enhanced definition Withdrawn FR2661538A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9005398A FR2661538A1 (en) 1990-04-27 1990-04-27 Colour matrix screen with enhanced definition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9005398A FR2661538A1 (en) 1990-04-27 1990-04-27 Colour matrix screen with enhanced definition

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FR2661538A1 true FR2661538A1 (en) 1991-10-31

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2571913A1 (en) * 1984-10-17 1986-04-18 Richard Joseph Display screen active matrix tandem addressing transistor
EP0182645A1 (en) * 1984-11-16 1986-05-28 Matsushita Electric Industrial Co., Ltd. Active matrix circuit for liquid crystal displays
EP0302468A1 (en) * 1987-08-04 1989-02-08 Nippon Telegraph And Telephone Corporation Active matrix type display device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2571913A1 (en) * 1984-10-17 1986-04-18 Richard Joseph Display screen active matrix tandem addressing transistor
EP0182645A1 (en) * 1984-11-16 1986-05-28 Matsushita Electric Industrial Co., Ltd. Active matrix circuit for liquid crystal displays
EP0302468A1 (en) * 1987-08-04 1989-02-08 Nippon Telegraph And Telephone Corporation Active matrix type display device

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