KR830001002B1 - Self-luminous light source for LCD clock - Google Patents

Abstract

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Description

Self-luminous light source for LCD clock

1 is a cross-sectional view showing the overall configuration of a display device for a liquid crystal watch using the self-luminous light source according to the present invention.

FIG. 2 is a cross-sectional view showing a specific configuration of the self-luminous light source 7 of FIG.

3 (A) is a plan view showing the second phosphor layer 8.

FIG. 3 (B) is a plan view of the upper glass plate 3 of FIG. 1 juxtaposed to explain the correspondence with the phosphor layer 8 shown in FIG. 3 (A).

4 is a diagram showing a change in emission intensity as a self-luminous light source due to a difference in reflecting material.

The present invention relates to a self-luminous light source applied to a liquid crystal clock capable of displaying time even at night or in a dark place.

A liquid crystal clock reflects light from the outside and displays letters and numbers. Therefore, it cannot be displayed in the dark or at night.

To do this overcomes clothing, conventionally, it was coated with a fluorescent material to the back wall of a liquid crystal display element, and further by inserting a tube probe the shape of the self-luminous light source filled with a high-pressure tritium gas ⁽³ H) therein performs a night display . However, in order to obtain a light source that is bright enough that the number by the liquid crystal can be recognized by the eye, its radiation intensity is inevitably about 100 mCi, and is not necessarily preferable in terms of safety.

Accordingly, an object of the present invention is to provide a liquid crystal watch self-luminous light source having a means for maximizing the utilization efficiency of fluorescence as much as possible in order to raise the drawbacks of the prior art mentioned above. .

In order to achieve the above object, in the present invention, a phosphor layer having light reflectivity and containing a radioactive material in at least a portion thereof, and on one side of the phosphor layer, reflects fluorescence from the phosphor layer and A reflection layer for scattering, a case for shielding radiation generated from the radioactive material on the opposite side of the phosphor layer of the reflection layer, and a radiation axis generated on the radioactive material on an axis opposite to the reflection layer of the phosphor layer And a cover for transmitting light from the phosphor layer and comprising a self-luminous light source for a liquid crystal watch.

Hereinafter, the present invention will be described in detail with reference to the drawings. 1 is a cross-sectional view of a display element for a liquid crystal watch constructed by using a self-luminous light source according to the present invention. In FIG. 1, (1) is a display element for liquid crystal clocks, (2) is an upper polarizing plate, (3) is an upper glass plate, and transparent conductive electrodes corresponding to numbers are deposited. (4) is a nematic liquid crystal material, (5) is a lower glass plate, and the transparent conductive electrode corresponding to the upper glass plate 3 is installed. (6) is a lower polarizing plate, and the upper polarizing plate 2 and the lower polarizing plate 6 are arrange | positioned so that polarization may orthogonally cross. (7) is a self-luminous light source which concerns on this invention, The detail is shown in FIG. In Fig. 2, reference numeral 8 denotes a phosphorescent fluorescent material (e.g., Z _n S: Z _n O, etc.), or a general phosphor (Z _n S: C _u, etc.), and (9) polyvinyl alcohol (PVA). Barium sulfate (B _a SO ₄ ) reflecting film 10 as a solvent is a metal case such as aluminum. In addition, in the present invention, as shown in FIG. 3 (A), a self-luminous type of fluorescent material (Z _n S: C _u ) and a radioactive material having substantially the same color and the same reflectance as the phosphor 8 is shown. The body 11 is formed. As a radiation source (especially β-ray source) for self-luminescence, solid tritium ( ³ H), promethium ( ¹⁴⁷ pm), nickel ( ⁶³ Ni), radium ( ²²⁶ Ra), strontium: yttrium ( ⁹⁰ Sr + ⁹⁰ Y) is recommended. It is becoming. The self-luminous phosphor 11 is formed so as to occupy only the time display portion, as is apparent from the third (A) and the third (B) diagrams. Therefore, the display portion of "second", "date", "am", "afternoon", and "day" other than the time display portion ["hour" only or "hour and minute") " 7.25 "is date and" 13 "is second) is occupied by the phosphor 8 which does not contain any radioactive substance. In FIG. 2, the cover 12 is a transparent polymer film, which absorbs β-rays generated by the self-luminous phosphor 11 and transmits light from the phosphors 8 and 11. It works. The cover 12 may use glass instead of the transparent polymer film. In this case, it is preferable that it is glass containing lead.

In the present invention, the following effects are obtained by adopting the above configuration.

(I) Since B _a SO ₄ is used as the reflector of fluorescence from ultraviolet to visible light, the emission intensity of at least 10% to 20% can be increased compared to other reflectors. For example, when a conventional reflector (Al vapor deposition, Au vapor deposition, and TiO ₂ white paint) is used and B _a SO ₄ is used, the difference appears clearly as shown in FIG. Since the original luminous intensity is low, even if the luminous intensity is increased by 10% to 20%, the display is sensed to be remarkably clear. In addition, as a reason for the increase in luminescence intensity by B _a SO ₄ ,

(a) B _a SO ₄ has high reflectance from the near ultraviolet to the visible range. '

(b) Since the fluorescence does not reflect at the mirror surface and is scattered and reflected by the fine powder of B _a SO _4, the phosphor is excited again by the scattered light, thereby producing a synergistic effect.

(c) Whereas the fluorescent material and its conjugate deteriorate the reflectivity by deteriorating the surface of Al and the surface layer of TiO ₂ , B _a SO ₄ is extremely stable chemically and is hardly affected by other organic materials, and thus high reflectance is maintained for a long time. maintain. Etc. can be mentioned.

(II) In order to increase the intensity of fluorescence, the whole radioactive substance is specifically concentrated only on the phosphor of the important display portion ("hours, minutes"), so that the degree of radioactivity is increased, and thus the luminescence intensity is increased. And as a whole, since it is low radioactivity intensity | strength, it is advantageous in terms of safety. In particular, it is limited to the display of only "hours" or "hours, minutes" because information such as date, second, and the like is unnecessary during nighttime sleep.

(III) Since the important display portion and the other display portions have the same color and the same reflectance, in a bright place in the daytime, they function only as reflectors completely, and display quality deterioration such that the self-luminescent phosphor portion is noticeable is not caused.

(Ⅳ) radioactive materials are used, so that both the solidified, if damaged money, ³ H gas is derived adverse effects such as environmental pollution, human contamination to less. The β-rays are all absorbed by the metal case, the polymer material, or the glass cover, and the safety is sufficiently secured.

Claims (1)

A phosphor layer having light reflectivity and containing at least a portion of a radioactive material, a reflecting layer on one side of the phosphor layer, for reflecting and scattering fluorescence from the phosphor layer, and a side opposite to the phosphor layer of the reflecting layer And a case for shielding radiation generated from the radioactive material, and a cover on a side opposite to the reflective layer of the phosphor layer, for absorbing radiation generated from the radioactive material and transmitting light from the phosphor layer. The self-luminous light source for liquid crystal clock which is comprised by the.

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