EP0402983A1 - Circuit d'excitation pour u dispositif de reproduction matriciel - Google Patents

Circuit d'excitation pour u dispositif de reproduction matriciel Download PDF

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Publication number
EP0402983A1
EP0402983A1 EP90201436A EP90201436A EP0402983A1 EP 0402983 A1 EP0402983 A1 EP 0402983A1 EP 90201436 A EP90201436 A EP 90201436A EP 90201436 A EP90201436 A EP 90201436A EP 0402983 A1 EP0402983 A1 EP 0402983A1
Authority
EP
European Patent Office
Prior art keywords
colour
counting
pixels
excitation pulse
circuit
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Withdrawn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
EP90201436A
Other languages
German (de)
English (en)
Inventor
Jean Hubertus Josef Lorteije
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of EP0402983A1 publication Critical patent/EP0402983A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control 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
    • G09G3/34—Control 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
    • G09G3/36—Control 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2014—Display of intermediate tones by modulation of the duration of a single pulse during which the logic level remains constant
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control 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
    • G09G3/2003—Display of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0297—Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0606—Manual adjustment
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control 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
    • G09G3/34—Control 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
    • G09G3/36—Control 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
    • G09G3/3607—Control 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

Definitions

  • the invention relates to a matrix display device, comprising a matrix of row and column conductors in which pixels are present between conductor crossings, which pixels can be excited by means of a row selection and a specific column drive with an excitation pulse, each column conductor being coupled to a column drive circuit comprising a counting circuit for each column conductor and having inputs for the supply of an excitation pulse number, an enable input and a clock pulse input, while after enabling and under the supply of clock pulses the counting circuit counts from the excitation pulse number to a reference number which leads to a counting period corresponding to the excitation pulse number, which counting period determines the period of the excitation pulse via a column drive stage coupled to outputs of the counting circuit.
  • Such a matrix display device is known from United States Patent 4,353,062.
  • Said Patent describes a drive circuit which also operates with pulse amplitude modulation.
  • the said Patent does not describe any specific measures for using the display device for colour display in which the pixels, each with their primary colour are grouped in composite colour pixels.
  • a matrix display device is characterized in that when using the display device for colour display, in which the pixels, each with their primary colour are grouped in composite colour pixels, the frequency of the clock pulses for the counting circuits is different for at least two primary colours.
  • An embodiment of the matrix display device according to the invention which leads to a display device having an optionally selectable colour adaptation is characterized in that at least two clock pulse frequencies are adjustable.
  • a further embodiment providing a colour adaptation having sufficient possibilities in practice is characterized in that an adjustability factor of the order of two to four increasing the clock pulse frequency is provided.
  • An embodiment for use with a colour mosaic filter is characterized in that the clock pulses can be applied to the counting circuits via a multiplex circuit.
  • the reference MX denotes a matrix of crossing row conductors L and column conductors C.
  • a number of row conductors L1, L2, L3 to L480 and a number of column conductors C1, C2, C3 to C240 are shown by way of example.
  • Pixels P are present between the conductor crossings, showing pixels P11, P12, P13 of the first row L1, P21 and P22 of the second row L2 and pixels P31 of the third row L3.
  • the row conductors L are connected for the known row selection to outputs of a row drive circuit LD.
  • the column conductors C are connected for a specific column drive by means of an excitation pulse to outputs of a column drive circuit CD.
  • Fig. 1 shows a matrix display device (MX, LD, CD, CLS) in which the references R, G and B show respective red, green and blue colour filter strips so as to indicate that it is suitable for colour display.
  • the light-­transmitting strips thus coloured are arranged in the column direction so that colour pixels located in the row direction are formed for which a colour pixel (P11, P12, P13) is mentioned as an example.
  • the display device can be used for colour television or for the coloured display of graphic or other data and may comprise gas discharge display cells, light-emitting diodes, liquid crystals, etc.
  • gas discharge display cells light-emitting diodes
  • liquid crystals etc.
  • this presupposition is based on pixels formed with liquid crystals which operate as light switches.
  • a light source artificial or the sun, is assumed to be present for which the liquid crystal as a light switch determines the transmitted and/or reflected light intensity at the red, green or blue pixel.
  • the light intensity ratio determines the colour of the composite colour pixel. This colour is further determined by the own colour of the light from the light source.
  • the facility to adapt the colour is realised, inter alia by applying to three separate input terminals CLR, CLG and CLB of the column drive circuit CD clock pulses indicated by the same references and having the respective frequencies fR, fG and fB.
  • Three separate groups of column drive circuits the first of which being denoted by CD1, CD2 and CD3 follow the terminals CLR, CLG and CLB in the circuit CD.
  • the last column drive circuit subsequent to the terminal CLB is denoted by CD240.
  • the first circuit CD1 subsequent to the terminal CLR is shown in greater detail and will be described by way of example for the other circuits.
  • the column drive circuit CD1 comprises a counting circuit CC1 having inputs I1, I2, I3 and I4 for the supply of an excitation pulse number, an enable input EI, a clock pulse input CLI and outputs Q1, Q2, Q3 and Q4.
  • the input terminal conveying the clock pulses CLR is connected to the clock pulse input CLI.
  • the enable input EI is connected to a terminal CE for the supply of an enable signal to be referred to similarly.
  • Fig. 1 shows that the terminal CE is connected to all column drive circuits CD1, CD2, CD3 to CD240.
  • A, for example 4-bit excitation pulse number associated with the instantaneous pixel between the column conductor C1 and the selected row conductor L is applied in known manner (not shown) to the inputs I1, I2, I3 and I4.
  • each counting circuit CC counts from its own excitation pulse number to a reference number, for example 0000. This may be effected by means of an up-counting or a down-counting operation.
  • the resultant counting period is fixed by both the excitation pulse number and the clock pulse frequency fR, fG and fB.
  • Fig. 1 shows a column drive stage DS1 connected to the column conductor, a switching circuit SC1 and a current source circuit IS1.
  • On-off switches S1, S2, S3 and S4 in the switching circuit SC1 are controlled from the outputs Q1, Q2, Q3 and Q4, respectively, via which switches S outputs of the current source circuit IS1 conveying respective currents A, 3A, 8A and 16A are connected to inputs of a circuit DS1 shown as an adder stage (+).
  • a circuit DS1 shown as an adder stage (+).
  • the matrix MX with pixels P shown in Fig. 1 has colour strips R, G and B arranged in the column direction.
  • the composite colour pixels (R, G, B) occur in the row direction and the pixel (P11, P12, P13) has been given by way of example.
  • Fig. 2 shows a different colour pixel structure, namely with a colour mosaic filter. In this case different primary colours occur in the column direction, as is illustrated at the column conductor C1 by means of R, B, G, R at the row conductors L1, L2, L3, L4.
  • the column conductors C must be driven in a cycle over three row conductors L, which is illustrated by means of a solid line L1, a broken line L2, a dotted line L3 and a solid line L4.
  • the drive is shown for six column conductors C1 to C6 in which the R, G, B sequence of Fig. 1 in the row direction is present at the row conductors L1 and L4.
  • the column drive circuit CD is shown with six column drive circuits CD1 to CD6 all of which have three inputs for supplying the clock pulses CLR, CLG or CLB in the said cycle. For the sake of simplicity the inputs for the supply of the excitation pulse numbers are not shown. It is evident that for the clock pulse cycle (CLR, CLG, CLB) excitation pulse numbers are also cyclically applied for red, green and blue to each circuit CD1, CD2, etc.
  • a multiplex circuit MUX is shown in Fig. 2 with three change-over switches MR, MG and MB each having a main contact T0 and three selector contacts T1, T2 and T3.
  • the reference 3LS denotes a switching terminal to which a switching signal denoted by the same reference is applied, which has a period which is equal to the said cycle.
  • the main contacts T0 of the change-over switches MR, MG and MB are connected to the input terminals CLR, CLG and CLB, respectively, which are connected to an output of the clock pulse source CLS.
  • the clock pulse distribution over the column drive circuits CD1 to CD6 is described by way of example at the through-­connection of the contacts T0 and T1.
  • the circuits CD1 and CD4 receive the clock pulses CLR
  • the circuits CD2 and CD5 receive the clock pulses CLG
  • the circuits CD3 and CD6 receive the clock pulses CLB.
  • the references R, G and B denote the processing of the relevant red, green and blue colour at the connection lead.
  • the signals of the colours R, B and G as associated with the column conductors C1 and C4 and the row conductors L1, L2 and L3 are indicated at the connection leads.
  • the signals of the colours G, R, B and B, G, R are indicated at the connection leads between the circuits CD2 and CD5 and CD3 and CD6, respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
EP90201436A 1989-06-12 1990-06-06 Circuit d'excitation pour u dispositif de reproduction matriciel Withdrawn EP0402983A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8901480A NL8901480A (nl) 1989-06-12 1989-06-12 Aanstuurschakeling voor een matrix weergeefinrichting.
NL8901480 1989-06-12

Publications (1)

Publication Number Publication Date
EP0402983A1 true EP0402983A1 (fr) 1990-12-19

Family

ID=19854815

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90201436A Withdrawn EP0402983A1 (fr) 1989-06-12 1990-06-06 Circuit d'excitation pour u dispositif de reproduction matriciel

Country Status (5)

Country Link
EP (1) EP0402983A1 (fr)
JP (1) JPH0336590A (fr)
KR (1) KR910001630A (fr)
FI (1) FI902849A0 (fr)
NL (1) NL8901480A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0936596A1 (fr) * 1998-02-16 1999-08-18 Canon Kabushiki Kaisha Dispositif et procédé d'affichage utilisant un système de modulation de la largeur d'impulsion avec modulation de l'horloge

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4353062A (en) * 1979-05-04 1982-10-05 U.S. Philips Corporation Modulator circuit for a matrix display device
EP0260146A2 (fr) * 1986-09-12 1988-03-16 International Business Machines Corporation Système d'affichage à plusieurs couleurs

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4353062A (en) * 1979-05-04 1982-10-05 U.S. Philips Corporation Modulator circuit for a matrix display device
EP0260146A2 (fr) * 1986-09-12 1988-03-16 International Business Machines Corporation Système d'affichage à plusieurs couleurs

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0936596A1 (fr) * 1998-02-16 1999-08-18 Canon Kabushiki Kaisha Dispositif et procédé d'affichage utilisant un système de modulation de la largeur d'impulsion avec modulation de l'horloge
US6947060B2 (en) 1998-02-16 2005-09-20 Canon Kabushiki Kaisha Image forming apparatus, electron beam apparatus, modulation circuit, and image-forming apparatus driving method

Also Published As

Publication number Publication date
NL8901480A (nl) 1991-01-02
KR910001630A (ko) 1991-01-31
JPH0336590A (ja) 1991-02-18
FI902849A0 (fi) 1990-06-07

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