Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2001-03-30
2004-10-05
Saras, Steven (Department: 2675)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S090000
Reexamination Certificate
active
06801180
ABSTRACT:
BACKGROUND OF THE INVENTION
The entire disclosure of the Priority document, Japanese Patent Application No. 2000-93576, filed Mar. 30, 2000, is hereby incorporated by reference herein its entirety.
1. Field of Invention
The present invention relates to display devices. Particularly, the invention relates to an organic electro luminescent display (OELD) or liquid crystal display (LCD).
2. Description of Related Art
Recently, the number of display devices using liquid crystal (hereinafter, referred to as display) is increasing at a rapid rate. Displays of this type are low in power consumption and are small, relative to a CRT display. Accordingly, it is important to take advantage of the merits of such a display, and produce a display that exhibits low power consumption and improved space saving.
Display devices of this type include those that effect the display by the use of current-driven luminescent devices instead of liquid crystal. Unlike a liquid crystal display, this current-driven luminescent device is a spontaneous luminescent device that emits light when supplied with current. This current-driven luminescent device can achieve high definition display. Moreover, no backlight is required, thereby achieving power reduction, increased viewing angle, increased constant ratio and so on. Among such current-driven luminescent devices, the EL devices (ElectroLuminescent devices) can be formed on a large-sized glass substrate. They are suited for displays, because thickness reduction and area increase, capacity increase (dot-matrix precision increase) and full color can be achieved.
SUMMARY OF THE INVENTION
One drawback of the EL devices is that when thin film transistors are used for driving pixels, for example, it is difficult to obtain accurate tonal levels due to variation in electric characteristic of the thin film transistors.
Therefore, it is one object of the present invention to provide a display device capable of accurately representing tonal levels. Furthermore, another object is to provide a display device capable of achieving space saving and power reduction for the system overall.
A display device according to the present invention includes storage circuits for storing image signals as binary data signals by driving connected write and data lines of a plurality of write lines and a plurality of data lines correspondingly disposed in an array pattern having a dot as a minimum unit of display. The display device also includes current-driven luminescent elements for emitting light depending on an amount of current supplied, display control sections connected between the storage circuit and the current-driven luminescent element to supply an amount of current depending on an electric power supplied on the basis of a value of the image signals stored in the storage circuits and control light emission of the current-driven luminescent elements connected, provided, as sets, with n sets in the same form in order for 2
n
tonal levels of representation within the dot array pattern to supply to each of the n sets an electric power in accordance with a place value represented by the image signals stored in the storage circuits.
In the display device according to the present invention, in order to represent tonal levels of 2
n
, there are provided within the dot array pattern n sets in the same form of storage circuits for storing image signals as binary data signals due to driving the connected write and data lines of a plurality of write lines and a plurality of data lines laid correspondingly to the dot array pattern as a minimum unit of display. Further, there are provided liquid crystal drive sections for driving a liquid crystal depending on a voltage supplied and display control section for effecting tonal control using the liquid crystal by the supply of supplied voltage to the liquid crystal drive sections on the basis of a value of the image signals stored in the storage circuits, thereby supplying, to each set, power depending on a place value represented by the image signals stored by the storage circuits.
A display device according to the present invention includes storage circuits for storing image signals as binary data signals by driving the connected write and data lines of a plurality of write lines and a plurality of data lines correspondingly disposed in an array pattern having a dot as a minimum unit of display. The display device further includes current-driven luminescent elements for emitting light depending on an amount of current supplied, display control sections connected between the storage circuit and the current-driven luminescent element, to supply an amount of current depending on an electric power supplied on the basis of a value of the image signals stored in the storage circuits and control light emission of the current-driven luminescent elements connected, provided, as sets, with n sets in the same form in order for 2
n
tonal levels of representation within the dot array pattern to supply to each of the n sets an electric power in accordance with a place value represented by the image signals stored in the storage circuits.
In this display device, a plurality of write lines and a plurality of data lines are laid correspondingly in an array pattern having a dot as a minimum unit of display. Within the dot array pattern are provided n sets of storage circuits storing image signals due to driving the connected write and data lines, current-driven luminescent elements for emitting light depending on an amount of current supplied, and display control sections for supplying an electric current in an amount dependent upon an electric power supplied to the current-driven luminescent elements. The sets are given the same form in respect of cost, occupation area and so on. Each set is adjusted in brightness by the supply of an electric power depending on a place value represented by the image signals stored in the storage circuits.
Also, a display device according to the invention configures each of the current-driven luminescent elements by an EL element. In this display device, display is made by EL elements as one kind of current-driven luminescent elements having the features of reduced thickness, high definition and low power consumption.
Also, a display device according to the invention includes storage circuits for storing image signals as binary data signals by driving connected write and data lines of a plurality of write lines and a plurality of data lines laid correspondingly to an array pattern of a dot as a minimum unit of display, liquid crystal drive sections for driving a liquid crystal depending on a voltage supplied, and display control sections connected for supplying a supplied voltage to the liquid crystal drive sections on the basis of the image signals stored in the storage circuits thereby effecting tonal control using the liquid crystal, provided, as sets, with n sets in the same form in order for 2
n
tonal levels of representation within the dot array pattern to supply to each of the n sets an electric power in accordance with a place value represented by the image signals stored in the storage circuits.
In this display device, a plurality of write lines and a plurality of data lines are correspondingly disposed in an array pattern having a dot as a minimum unit of display. Within the dot array pattern are provided n sets of storage circuits storing image signals due to driving the connected write and data lines, liquid crystal driving sections for driving the liquid crystal depending on a voltage supplied, and display control sections for supplying an electric voltage to the liquid crystal driving sections. The sets are given the same form in respect of cost, occupation area and so on. Each set is adjusted in brightness by the supply of an electric power depending on a place value represented by the image signals stored in the storage circuits.
Also, a display device according to the invention forms each of the storage circuits and each of the display control sections by polycrystalline silicon TFTs.
In this display dev
Jorgenson Leland Ronald
Oliff & Berridg,e PLC
Saras Steven
Seiko Epson Corporation
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