JP2000351543A - Display device of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily judge the replacement timing of an indicator with a dot LED deteriorated in luminance by outputting an alarm signal when the drive pulse width of the dot LED in a dot type LED indicator for elevator is a prescribed time or more. SOLUTION: When a floor display data transmitted through a transmission passage is inputted to a communication circuit 17, a MPU 11 displays characters on a dot type LED indicator 14 (floor indicator lamp and direction indicator lamp) on the basis of it. When a hall button 19 is pressed, the information of the hall button 19 is transmitted to the transmission passage through the communication circuit 17. At this time, a timer 15 counts the time of supplying power to the LED indicator 14 and retains the count data. The luminance change of LED element is calculated from the count data, and the pulse width of an output allowance signal 24 is extended by the portion of the luminance deterioration to increase the luminance of the displayed characters. When the pulse width is a prescribed value or more, an alarm signal 41 is outputted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device for displaying operation information of an elevator, and more particularly to a display device for a dot type LED display, which corrects the aging deterioration of the display brightness of a dot LED, and when a correction rate becomes a predetermined value or more. The present invention relates to an elevator display that outputs a warning signal.

[0002]

2. Description of the Related Art In a dot-type LED display, in order to light a light emitting element by time division control, a driving method of passing a pulse current intermittently with a fixed time width is used for the light emitting element.

In such a driving method, a current is intermittently supplied to the light emitting element, so that the light emitting state of the light emitting element blinks due to the intermittent current, but is recognized by the naked eye as apparently continuous light emission due to an afterimage phenomenon.

For example, in the technique disclosed in Japanese Patent Application Laid-Open No. Hei 10-333628, the LED drive current is kept constant by operating a hall call button, and the pulse width is changed to correct the brightness of the displayed characters.

[0005]

SUMMARY OF THE INVENTION In a dot-type LED display having means for correcting aging deterioration of dot LED luminance, when the correction rate of dot LED luminance reaches a limit,
Further correction of the luminance deterioration becomes impossible, and thereafter, the luminance deteriorates and the display luminance is decreasing.

However, it is impossible to judge whether or not the correction limit has been reached even in the above-mentioned state, so that there is a problem that the necessity of replacing the dot type LED must be visually checked.

An object of the present invention is to make it possible to determine, by a warning signal, the time to replace a display device whose dot LED has deteriorated in luminance.

Another object of the present invention is to provide a display device for an elevator, which makes it possible to know beforehand the time of replacement of a display device whose dot LED has deteriorated in luminance and which is excellent in maintainability.

[0009]

The object of the present invention is to provide a dot LE.
This is achieved by outputting a warning signal when the drive pulse width of D exceeds a predetermined time.

In the elevator display device, when the correction of the aging deterioration of the dot LED brightness reaches the limit, a warning signal is output, and it is possible to judge the replacement time of the dot type LED display, and the display of the elevator with excellent maintainability. The device can be realized.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall construction of the elevator. When the hall button 19 is pressed, the information is transmitted to the control panel 1 via the transmission line 5. Upon receiving the elevator call information, the control panel 1 operates in response to the floor where the elevator call has occurred. Further, the dot type LED display 7 displays the current position of the car 3.

FIG. 2 shows a control circuit configuration of the dot type LED display. When the floor display data sent by the transmission line is input to the communication circuit 17, the MPU 11 is based on the data.
Displays characters on the floor indicator light and direction light 14 which are dot type LED displays. When the hole button 19 is pressed, the input circuit 18 converts the signal level and performs M
It is input to PU11. Then, the MPU 11 is configured to transmit the information of the hole button 19 to the transmission path via the communication circuit 17. The timer 15 counts the time during which power is supplied to the dot-type LED display 7, and stops counting when the power supply is cut off to hold the count data.

FIG. 3 shows the appearance of a dot-type LED display element. A plurality of display elements 14a are arranged to form a floor indicator light and a direction light 14.

The operation of displaying the floor indicator light and the direction light 14 is performed by the common select signal 2 from the MPU 11.
1 to 23, a plurality of segment signals 25, and an output permission signal 24 are output to turn on one row selected by the common select signal of the floor indicator lamp and the direction lamp 14. This operation displays all the characters while switching the lines sequentially in a time-division manner.

FIG. 4 shows common select signals 21 to 23,
This shows the timing of the segment signal 25 and the output permission signal 24. The LED lighting timing is the same as the pulse width t of the output permission signal 24.

FIG. 5 shows an example of a luminance change due to aging of the dot-type LED display element 14a. The luminance of the display character of the dot-type LED display element 14a at the start of operation is shown.
If 100% (initial value), 10 years later the initial value of 5
It can be seen that the luminance changes linearly to 0%.

Referring to the count data of the timer 15, the luminance of the current display character can be calculated based on the luminance change (FIG. 5) due to the aging deterioration of the dot type LED element. From this result, the pulse width t of the output permission signal 24 is increased by an amount corresponding to the deterioration of the luminance of the display character, thereby increasing the luminance of the display character.

Here, if the pulse width t of the output permission signal 24 is made longer, the brightness of the displayed characters becomes brighter. Conversely, when the pulse width t of the output permission signal 24 is shortened, the brightness of the displayed character becomes dark.

When the time width of the pulse width t of the output permission signal 24 exceeds a predetermined value, a warning signal 41 is output to inform that the correction limit has been reached. That is, the dot type L
It can be determined that it is time to replace the ED display.

According to the present embodiment, the aging of displayed characters can be automatically corrected by the operating time of the elevator, and a display device that is easy to see can be realized.

[0022]

According to the present invention, when the dot LED luminance reaches the correction limit of aging deterioration, a warning signal is output, so that the replacement time can be easily determined, and a display device excellent in maintenance can be realized. .

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an elevator.

FIG. 2 is a control circuit configuration diagram of a dot-type LED display.

FIG. 3 is an external view of a dot type LED display element.

FIG. 4 is a diagram showing control timing of a dot type LED display.

FIG. 5 is a diagram illustrating a change in luminance due to aging of a dot-type LED display element.

[Explanation of symbols]

1 ... control panel, 2 ... induction motor, 3 ... basket, 4
... balance weight, 5 ... transmission line, 7 ... dot type LED display, 11 ... MPU, 12 ... common driver circuit, 13 ...
Segment driver circuit, 14 ... Floor indicator light and direction light, 14a ... Dot type LED element, 15 ... Timer, 17
... communication circuit, 18 ... input circuit, 19 ... hole button, 2
1 to 23: common select signal, 24: output permission signal,
25: segment signal, 25a: segment signal a, 2
5b: segment signal b, 25c: segment signal c, 2
5d: segment signal d, 30e: memory, 41: warning signal.

Continued on the front page (72) Inventor Riki Komatsu 232 Horiguchi, Hitachinaka-shi, Ibaraki Pref. System Plaza Katsuta Hitachi Mito Engineering Co., Ltd. F-term (reference) 3F303 BA01 CB36 DB04 DC03 DC04 DC35 3F304 BA07 ED06 ED11

Claims (1)

[Claims] 1. A dot-type LED display provided in each elevator hall or in a car for displaying a car position and a driving direction, wherein the dot-type LED display has a means for correcting aged deterioration of dot LED luminance. An elevator display device for outputting a warning signal when an automatic correction rate is equal to or greater than a predetermined value.