JPH01197995A - Electro-luminescence display - Google Patents

Abstract

PURPOSE:To reduce the cost by controlling flow of ions of the main surface of a light emitting layer including a thin film electro-luminescence layer on a transparent substrate on the side where it does not contact a transparent electrode for forming an electrostatic image to make a display. CONSTITUTION:Ion electrification is applied for forming an electric field to be applied to an electro-luminescence light emitting layer 6 on a transparent substrate 1 where a transparent electrode 2 is formed. That is, ions are selectively electrified on an electro-luminescence light emitting layer 6 by means of a write electrode 5 to obtain an electrostatic image. An ion-electrified part produces an electric field between the part and the transparent electrode 2, and a non-ion-electrified part does not have an electric field produced, so that an electro-luminescence display is realized corresponding to the electrostatic image by existence and non-existence of light emission. The cost on the titled device, including assembling and mounting cost, can thus be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electroluminescent (hereinafter referred to as EL) display used as an image display device.

(Prior art) EL displays include segment type used in watches, calculators, etc., simple X-Y matrix type used for large capacity displays,
Active matrix types using thin film transistors and the like are being considered.

(Problems to be solved by the invention) With the X-Y matrix type, as the display becomes larger in capacity and higher in density, the number of terminal electrodes increases and connection with peripheral circuits due to higher density becomes difficult, and expensive There were problems such as an increase in the amount of driver IC used.

The present invention provides an EL display with a simple structure that is free from such problems.

[Means for solving problems]

The present invention will be explained below with reference to the drawings. FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and the feature of the present invention is that an ELJ! The point is that an EL panel on which a light layer is formed is used. As the EL light emitting layer, S
i, N, Y, 0. A dielectric thin film such as ZnS:Mn or the like sandwiched with a thin EL layer is used. E[411 Ion charging is used to form an electric field applied to the optical layer. That is, the write electrode 5 selectively charges ions onto the light emitting layer 6 to obtain an electrostatic image. The charged part of the ion generates an electric field between it and the transparent electrode 2, and the uncharged part of the ion does not generate an electric field, so the presence or absence of light emission differs, realizing an EL display compatible with electrostatic images. can. As the write W1 pole, for example, a write electrode consisting of a corona ion generator and a control electrode for controlling the flow of the ions as shown in Japanese Patent Laid-Open No. 62-34187 can be used.

An example is shown in FIG. A positive or negative voltage of about 3 to 10 KV is applied to the gold-plated tungsten wire 7 having a diameter of 40 to 120 μm to generate corona ions. The passage of these ions is controlled by the control electrode 8. The control electrode 8 is configured such that an upper electrode 8a and a lower electrode 8b are arranged at a predetermined interval, and a corona ion flow can pass through a through hole provided in the center. Next, the operation will be explained.

When the control power source 10 is applied so that the upper electrode 8a is positive and the lower electrode is negative as shown in FIG. 2(a), the electric field becomes forward and corona ions pass through. On the other hand, if the control power source lO is applied with the opposite polarity as shown in FIG.

(Effects of the invention) The number of poles taken out from the display panel is only one that applies a potential to the transparent electrode, and the number of expensive driver ICs can be reduced to less than half of the conventional number for the number of pixels on the X side or Y side. . This makes it possible to significantly reduce costs including assembly and mounting.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing one embodiment of the present invention, Figure 2 (8)
, (b) is a circuit diagram illustrating an embodiment of the write electrode and its operating principle. Explanation of symbols

Claims (1)

[Claims] 1. A light-emitting layer including at least a thin electroluminescent layer is formed on a transparent substrate on which a transparent electrode is formed, and an electrostatic image is formed by controlling the flow of ions on the main surface of the light-emitting layer on the side not in contact with the transparent electrode. An electroluminescent display characterized in that it is configured to form a display.