JP2003208128A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device the display parts of which are made always easy to watch by fitting an illuminance sensor for measuring illuminance to the individual display parts and adjusting the luminance of all the display parts in accordance with the highest measured value of the illuminance among illuminance values measured by the illuminance sensor. <P>SOLUTION: The display device is provided with first and second display parts to be provided on mutually different surfaces, first and second illuminance measuring means for measuring illuminance in the neighborhood of the respective display parts, and a control means which lights the individual display parts with illuminance corresponding to the measured value of the respective illuminance measuring means and controls the illuminance of the respective display parts on the basis of the higher measured value of the illuminance among the measured values of the respective illuminance measuring means. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device with adjustable brightness.

[0002]

2. Description of the Related Art Display devices for displaying characters and images such as electronic bulletin boards, especially display devices installed outdoors, are subject to changes in the illuminance environment such as the influence of weather such as how the sunlight hits and the influence of adjacent lighting devices. , The visibility of the displayed information may change.

As a method for improving this, as shown in FIG. 4, a display section (1), a brightness adjusting circuit (4) for adjusting the brightness of the display section (1), and a control circuit for controlling the entire display device. (5) and the control circuit (5) which is provided near the display unit (1) and detects the illuminance near the display unit (1) as an illuminance value.
The illuminance sensor (2) that outputs the illuminance value to the display and the memory (3) that stores the brightness value of the display unit (1) corresponding to the illuminance value. To the control circuit (5). Then, the control circuit (5) reads out the brightness value corresponding to the illuminance value output from the illuminance sensor (2) from the memory (3) and outputs the brightness value to the brightness adjustment circuit (4). And control circuit (5)
There is a display device in which the brightness adjustment circuit (4) performs a brightness adjustment operation with a more given brightness value and changes the brightness of the display unit (1) to make it easier to see even if the illuminance environment changes.

By the way, the display device is often used for advertisements and advertisements, and it is necessary for as many people as possible to see the display device. Therefore, there is a display device provided with a plurality of display units in order to make it visible not only in one direction but also in multiple directions. In this device, if the brightness of each display unit is adjusted by the above-described method, a control circuit is required for each display unit, the circuit becomes complicated, and the cost becomes high. Is detected, and the brightness of the plurality of display units is determined by the illuminance value.

[0005]

However, in the case where the display device is provided with a plurality of display portions, when the surface on which the illuminance sensor is installed is bright due to sunlight or the like and a part of the display surface is dark due to the shade or the like. , The brightness of the display unit is determined to be bright, and the brightness of the display unit in the dark portion is sufficiently brighter than the illuminance, so that there is no problem in visibility.

On the contrary, when the surface on which the illuminance sensor is installed is dark due to the shade or the like even though a part of the display surface is bright due to the sunlight or the like, it is determined to be dark and the brightness of the display unit is lowered. Therefore, there is a problem in that the brightness of the display part in the bright part becomes darker than the surrounding illuminance, which makes it difficult to see.

[0007]

In order to achieve the above object, first and second display portions provided on mutually different surfaces and first and second display portions for measuring illuminance near the respective display portions. Illuminance measuring means, the respective display unit is turned on at a brightness corresponding to the measured value of the respective illuminance measuring means, among the measured values of the respective illuminance measuring means, based on the measured value of the higher illuminance, A control means for controlling the brightness of each of the display units is provided.

As described above, an illuminance sensor for measuring illuminance is attached to each display unit, and among the illuminances measured by the illuminance sensor,
By adjusting the brightness of all the display units according to the measurement value with the highest illuminance, it is an object to construct a display device with a low-cost and simple circuit configuration in which the display unit in the bright illuminance area is always easy to see.

In the display device according to the second aspect, the second display section is provided on the back surface of the first display section.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. It should be noted that portions having the same configurations as those in FIG.

The display unit 1 (11) displays characters and images, and is formed of a large number of display pixels including lamps and LEDs. The display unit 2 (12) is the display unit 1 (1
It is formed similarly to 1) and is provided on the back surface of the display unit 1 (11). Illuminance sensor 1 (21) and illuminance sensor 2 (2
2) measures the illuminance in the vicinity of the display unit 1 (11) and the display unit 2 (12), and is attached around the display unit 1 (11) and the display unit 2 (12). The illuminance sensor 1 (21) and the illuminance sensor 2 (22) have a light receiving element such as a photo coupler and output a signal proportional to the illuminance.

The memory (3) includes the illuminance of the display unit 1 (11) or the display unit 2 (12) and the display unit 1 (11) and the display unit 2.
The relationship of brightness in (12) is set and stored,
It is formed of a rewritable memory such as a RAM. As shown in FIG. 2, this memory (3) is provided with an illuminance sensor 1 (21).
Or, it indicates the brightness level of the display of the display unit 1 (11) and the display unit 2 (12) with respect to the illuminance level output by the illuminance sensor 2 (22), and stores the correspondence relationship between the illuminance and the brightness serving as a reference in advance. I'll do it.

The brightness adjusting circuit (4) has a display section 1 (11) based on a brightness value output from a control circuit (5) described later.
Also, the brightness of the display unit 2 (12) is controlled. The control circuit (5) controls the entire device, and at the same time, the illuminance sensor 1
The brightness value corresponding to the higher illuminance value of the signals output from (21) and the illuminance sensor 2 (22) is read from the memory (3) and output to the brightness adjustment circuit (4). Further, the control circuit (5) controls so that characters and images input from the outside are displayed on the display unit 1 (11) and the display unit 2 (12) with a predetermined brightness.

Next, the operation of this embodiment will be described with reference to the flow chart of FIG.

In step S1, the illuminance sensor 1 (2
1) and the illuminance sensor 2 (22) output the measured illuminance value to the control circuit (5). Control circuit (5) is input 2
When the two illuminance values are less than the reference illuminance shown in Fig. 2, "0" is displayed.
When the illuminance is equal to or higher than the reference illuminance, "1" is assigned and an OR operation is performed (step S2). That is, of the illuminances measured by the respective illuminance sensors, the one with the higher illuminance is obtained. Then, the calculation result is collated with the brightness value stored in the memory (3),
The corresponding brightness value is output to the brightness adjusting circuit (4) (step S3).

The brightness adjusting circuit (4) uses the brightness input from the control circuit (5) to display the display section 1 (11) and the display section 2 (1).
The lamp or LED forming 2) is turned on (step S4).

The display unit 1 (11) and the display unit 2 (1
The brightness of 2) may be changed by changing the voltage value supplied to the lamp or the LED forming the display section in the brightness adjusting circuit (4). In the case of dynamic lighting, the pulse of the input voltage may be changed. The brightness may be changed by changing the width.

Further, although the number of display units and the number of illuminance sensors are two in this embodiment, the number of display units is not limited to this, and the same number of illuminance sensors as a plurality of display units can be used.

Further, the illuminance and the brightness stored in the memory (3) are not limited to these, and the illuminance and / or the brightness may be arbitrarily changed.

Further, although the illuminance level and the brightness level are set to two levels in this embodiment, the present invention is not limited to this.
There may be multiple levels.

[0022]

According to the display device of the present invention, an illuminance sensor for measuring illuminance is attached to each display unit, and among all the illuminances measured by the illuminance sensor, the illuminance sensor measures all the display units according to the highest illuminance. Since the brightness is adjusted, it is possible to provide a display device in which the display section is always easy to see.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a configuration of a display device of the present invention.

FIG. 2 is a diagram showing setting contents of a memory of the display device of the present invention.

FIG. 3 is a flowchart showing the operation of the display device of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional display device.

[Explanation of symbols]

11 Display 1 12 Display 2 21 Illuminance sensor 1 22 Illuminance sensor 2 3 memory 4 Brightness adjustment circuit 5 control circuit

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI Theme Coat (reference) G09G 5/00 550 G09G 5/00 550C 5/10 5/10 (72) Inventor Tetsuya Yamane Tottori City, Tottori Prefecture Minamiyoshikata 3-201 Tottori Sanyo Electric Co., Ltd. (72) Inventor Shinya Tanaka Tottori-shi, Tottori-shi Minamiyoshikata 3-201 Tottori Sanyo Electric Co., Ltd. F term (reference) 2G065 AA03 AA15 AA17 BA40 BC13 BC14 BC19 BC33 BD03 DA05 5C080 AA07 AA08 BB05 CC07 DD04 EE28 HH14 JJ02 JJ07 KK33 5C082 AA03 AA21 AA34 BA35 BB51 BD07 CA11 CA81 CB03 DA71 MM10

Claims (2)

[Claims] 1. A first and a second provided on surfaces different from each other.
Display unit, first and second illuminance measuring means for measuring illuminance in the vicinity of the respective display units, and illuminating each of the display units with a brightness corresponding to a measurement value of the respective illuminance measuring unit, A display device comprising: a control unit that controls the brightness of each display unit based on the measured value of the higher illuminance among the measured values of the respective illuminance measurement units. 2. The display device according to claim 1, wherein the second display unit is provided on the back surface of the first display unit.