U.S. patent application number 10/195169 was filed with the patent office on 2004-01-22 for automatically illumination control device of an elevator display screen.
Invention is credited to Hong, Chi-Jung.
Application Number | 20040011595 10/195169 |
Document ID | / |
Family ID | 30114920 |
Filed Date | 2004-01-22 |
United States Patent
Application |
20040011595 |
Kind Code |
A1 |
Hong, Chi-Jung |
January 22, 2004 |
AUTOMATICALLY ILLUMINATION CONTROL DEVICE OF AN ELEVATOR DISPLAY
SCREEN
Abstract
An automatically illumination control device of an elevator
display screen serves for displaying the position and maintenance
of the elevator. A light sensor for detecting the intensity of
light is installed to the display screen. The light sensor detects
the illumination of the environment light and the illumination of
the display screen is controlled automatically by using a control
circuit so as to present a soft light which is warm to the visual
sense. Moreover, the automatically illumination control device has
the advantages of power saving and long lifetime.
Inventors: |
Hong, Chi-Jung; (Taipei,
TW) |
Correspondence
Address: |
Chi-Jung Hong
235 Chung-Ho
Box 8 - 24
Taipei
TW
|
Family ID: |
30114920 |
Appl. No.: |
10/195169 |
Filed: |
July 16, 2002 |
Current U.S.
Class: |
187/391 |
Current CPC
Class: |
B66B 3/02 20130101; Y02B
50/00 20130101; Y02B 50/12 20130101 |
Class at
Publication: |
187/391 |
International
Class: |
B66B 003/00 |
Claims
What is claimed is:
1. An automatically illumination control device of an elevator
display screen having an elevator display screen; the display
screen being installed with a driving circuit; the display screen
having a microprocessor, a control circuit and at least one light
sensor; wherein the elevator display screen is installed with an
array of light emitting elements; characterized in that: the light
sensor is installed to the display screen for detecting environment
light outside an elevator and then outputting signals about
detected light intensity to the control circuit; the control
circuit comparing signals outputted from the light sensor and with
default values and then transferring comparing results to the
microprocessor; and the microprocessor causes the display screen to
change illumination of light according to the comparing result
outputted to the display screen.
2. The automatically illumination control device of an elevator
display screen as claim in claim 1, wherein the light sensor is
selected one from a group containing light sensitive resistors and
infrared sensors.
3. The automatically illumination control device of an elevator
display screen as claim in claim 1, wherein the light emitting
element is a light detecting element.
4. The automatically illumination control device of an elevator
display screen as claim in claim 1, wherein the illumination of the
display screen is changed by stages or continuously.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to display screens, and
particularly to an automatically illumination control device of an
elevator display screen for controlling the illumination of the
light emitting elements of the display screen.
[0003] 2. Description of Related Art
[0004] Elevators are necessary devices for tall buildings. In
general display screens are installed beside or above the elevator
doors for displaying the traveling condition of the elevator, as
shown in the FIG. 1. The current display screen is mainly formed by
LEDs which have constant illuminations independent of the intensity
of environment light. However, this prior art has the following
disadvantages:
[0005] 1. Since the intensity is fixed, the illumination is weak in
daytime so that the user can not see the display content
clearly.
[0006] 2. At night, the illumination of the display screen is too
strong to feel comfortably.
[0007] 3. When deep in the night, the display screen has a fixed
illumination, not only power is wasted, but also the lifetime is
reduced. Moreover, the structure of the display screen will
deteriorate.
[0008] To improve above detect, some elevator display screens are
added with sleep devices. When for a time period, an elevator is
not been used, the illumination of the display screen will become
dark so as to save power and prolong the lifetime. However, this
improvement can not be resolve the problem induced from the change
of the environment light.
SUMMARY OF THE INVENTION
[0009] Accordingly, the primary object of the present invention is
to provide an automatically illumination control device of an
elevator display screen, wherein the light sensor detects the
illumination of the environment light and the illumination of the
display screen is controlled automatically by using a control
circuit so as to present a soft light which is warm to the viewer.
Moreover, the automatically illumination control device has the
advantages of power saving and long lifetime.
[0010] To achieve the object, the present invention provides an
automatically illumination control device of an elevator display
screen having an elevator display screen; the display screen being
installed with a driving circuit; the display screen having a
microprocessor, a control circuit and at least one light sensor;
wherein the elevator display screen is installed with an array of
light emitting elements. The light sensor is installed to the
display screen for detecting environment light out of an elevator
and then outputting the signals to the control circuit. The control
circuit comparing signals outputted from the light sensor and
transferring the signals to the microprocessor. The microprocessor
performing operation; and the display screen serves to change
illumination of light outputted to the display screen.
[0011] The advantages of the present invention will be described in
the followings.
[0012] 1. When the light sensor feels that the environment light is
intense, the illumination of the display screen will increase so as
to be identified easily.
[0013] 2. When the environment light is weak, the illumination of
the display screen will decrease so as to be identified easily.
[0014] 3. The illumination of the display screen is adjusted
intelligently so that the display screen has a proper illumination
and thus the lifetime of the display screen is prolonged. The
material of the display screen can not be deteriorated.
[0015] 4. The display screens of different stories has different
illuminations.
[0016] The various objects and advantages of the present invention
will be more readily understood from the following detailed
description when read in conjunction with the appended drawing.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 is a schematic view of the display screen of an
elevator according to the present invention.
[0018] FIG. 2 is an enlarge schematic view of the elevator display
screen of the present invention.
[0019] FIG. 3 is a block diagram showing the arranged of the
present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0020] The structure and effect of the automatically illumination
control device of an elevator display screen according to the
present invention will be described herein with the reference
drawings. One preferred embodiment according to the present
invention is used in the following as an example for easily
understanding the present invention by those skilled in the
art.
[0021] The elevator display screen 1 or 12 according to the present
invention is installed on a wall at a lateral side or an upper side
of an elevator door 10. The display screen 1 or 12 is formed by a
plurality of light emitting elements 11 which are arranged as an
array, such as LEDs or LCDs, as shown in the FIG. 2. At least one
light sensor 2 is installed to a predetermined position of the
display screen 1 or 12.
[0022] The light emitting element 11 can detect light intensity of
the environment. In application, the light sensor 2 can be a light
sensitive resistor. Since the resistor of the light sensitive
resistor is changeable with respect to the intensity of the
radiating light, when the strength of the radiating light
increases, the resistor of the light sensitive resistor will
reduce. By the characteristic of the light sensitive resistor, when
the light sensor 2 detects a strong light, the resistor will
decrease. On the contrary, when the light sensor 2 detects weak
light, the resistor will increase.
[0023] Other than light sensitive resistor, above mentioned light
sensor 2 may be an infrared sensor or other equivalent element with
light detecting ability or other elements with function like the
light sensitive resistor.
[0024] To achieve the object of getting the automatically
illumination control device of an elevator display screen, in the
present invention, the automatically illumination control device of
an elevator display screen of the present invention can be realized
by the block diagram of FIG. 3. When the light sensor 2 detects the
light intensity of the environment light 31, the resistor of the
light sensor 2 will change according to the sensed result and then
outputs an analog signal to a control circuit 32 to be compared
with a default reference voltage. Then the analog signal is
converted into digital signal to be sent to a microprocessor 33 for
being processed. A driving circuit 34 is used to control the
illuminations of the plurality of light emitting element 11 of the
display screens 1 or 12. Thereby, the illuminations of the light
emitting elements 11 of the display screen 1 or 12 are adjusted
with the change of the environment light.
[0025] Although the user may feel that the display screen 1 or 12
lights up continuously. In fact, it is flashed by a sequence of
ON-OFF operations. That is, when the display screen is a high
voltage, it turns ON and lights up. On the contrary when the
display screen is at a lower voltage, then it will turn off. From
the viewpoint of visual feeling, the longer the turning on period
or the short the turn off period, the brighter the display screen.
Moreover, the shorter the turn on period or the longer the turn off
period, the darker the display screen.
[0026] When the light sensor 2 detects a weak intensity, it will
reduce the time period of turning-on and increase the time period
of turning-off so that the illumination of the display screen 1
will become dark. On the contrary, When the light sensor 2 detect a
strong intensity, it will increase the time period of turning-on
and reduce the time period of turning-off so that the illumination
of the display screen 1 will become bright. Thereby, the control of
the display screen 1 or 12 (time period control for low voltage and
high voltage) is controlled according to the variation of the
resistor of the light sensitive resistor. Thus the change of the
illumination of the display screen 1 can be performed by stages or
continuously.
[0027] Therefore, the automatically illumination control device of
an elevator display screen of the present invention is different
from the conventional one which has a display screen with a fixed
illumination. The illumination of the display screen of the present
invention is changeable with the environment light so as to meet
the practical requirement. Although the present invention has been
described with reference to the preferred embodiments, it will be
understood that the invention is not limited to the details
described thereof. Various substitutions and modifications have
been suggested in the foregoing description, and others will occur
to those of ordinary skill in the art. Therefore, all such
substitutions and modifications are intended to be embraced within
the scope of the invention as defined in the appended claims.
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