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1. WO2007144988 - DISPLAY DEVICE AND TELEVISION RECEIVER

Publication Number WO/2007/144988
Publication Date 21.12.2007
International Application No. PCT/JP2007/051125
International Filing Date 25.01.2007
IPC
G09G 3/36 2006.01
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for 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
34by control of light from an independent source
36using liquid crystals
G02F 1/133 2006.01
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01for the control of the intensity, phase, polarisation or colour
13based on liquid crystals, e.g. single liquid crystal display cells
133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
G09G 3/20 2006.01
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for 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
G09G 3/34 2006.01
GPHYSICS
09EDUCATING; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
3Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
20for 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
34by control of light from an independent source
H04N 5/66 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
66Transforming electric information into light information
CPC
H04N 5/645
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
64Constructional details of receivers, e.g. cabinets or dust covers
645Mounting of picture tube on chassis or in housing
H04N 5/66
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
5Details of television systems
66Transforming electric information into light information
H04N 7/0132
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
NPICTORIAL COMMUNICATION, e.g. TELEVISION
7Television systems
01Conversion of standards ; , e.g. involving analogue television standards or digital television standards processed at pixel level
0127by changing the field or frame frequency of the incoming video signal, e.g. frame rate converter
0132the field or frame frequency of the incoming video signal being multiplied by a positive integer, e.g. for flicker reduction
Applicants
  • シャープ株式会社 SHARP KABUSHIKI KAISHA [JP]/[JP] (AllExceptUS)
  • 細木 満 HOSOKI, Mitsuru (UsOnly)
Inventors
  • 細木 満 HOSOKI, Mitsuru
Agents
  • 上野 登 UENO, Noboru
Priority Data
2006-16770216.06.2006JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) DISPLAY DEVICE AND TELEVISION RECEIVER
(FR) DISPOSITIF D'AFFICHAGE ET TÉLÉVISEUR
(JA) 表示装置およびテレビ受信機
Abstract
(EN)
It is possible to provide a display device which can maintain a change ratio of the screen luminance almost constant when switching between a mode not inserting a period for performing black display and a mode inserting the period for performing black display during one frame period. The display device includes a display panel (15) for displaying an image, a drive control circuit (11) for driving the display panel (15), a light source (14) for applying light to the display panel (15), and a light source drive circuit (16) for adjusting the light source (14) by the pulse width modulation method. The drive control circuit (11) inserts a period for performing display with the luminance based on the image signal and a period for performing black display into the one-frame period. The light source drive circuit sets the PWM frequency to (frame frequency)/(ratio of a period performing black display to be inserted into one-frame period) multiplied by an integer or sets the PWM frequency to the frame frequency multiplied by (n + 0.5) wherein n is a positive integer.
(FR)
La présente invention concerne un dispositif d'affichage permettant de maintenir pratiquement constant un rapport de variation de la luminance d'écran lors de la permutation entre un mode sans insertion de période d'exécution d'affichage noir et un mode avec insertion de période d'exécution d'affichage noir pendant une période de trame. Le dispositif d'affichage comprend un panneau d'affichage (15) qui affiche une image, un circuit de commande (11) qui commande le panneau d'affichage (15), une source lumineuse (14) qui applique une lumière au panneau (15) et un circuit de commande de source lumineuse (16) qui règle la source lumineuse (14) par un procédé de modulation d'impulsions en durée. Le circuit de commande (11) insère une période d'exécution d'affichage avec la luminance basée sur le signal d'image et une période d'exécution d'affichage noir dans la période de trame. Le circuit de commande de source lumineuse règle la fréquence MID sur la fréquence de trame divisée par le rapport d'une période d'exécution d'affichage noir à insérer dans une période de trame et multipliée par un entier, ou règle la fréquence MID sur la fréquence de trame multipliée par (n + 0,5), n étant un entier positif.
(JA)
not available
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