JP2552212B2 - Display panel brightness adjustment method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for adjusting the brightness of a display board, which can remotely adjust the brightness of a display board using a light emitting diode (hereinafter referred to as LED) as a display element.

[0002]

2. Description of the Related Art In recent years, a large number of LEDs have been widely used as display elements for display boards such as electronic bulletin boards. However, individual LEDs were supplied with the same amount of current from the stage of production. In the case where the LEDs are used for the display panel, it is necessary to select and collect LEDs having the same brightness to make the luminance of the entire display panel uniform, because the brightness of each case varies.

However, an LED whose display panel is used on a large scale
LEDs with similar brightness when the number of LEDs is very large
It is difficult to collect the required number of display panels. Therefore,
As shown in FIG. 4, for example, a display board 51 capable of displaying 6-digit characters is divided into a total of 6 display blocks 52 for each digit,
Each display block 52 is 16 × 16 = in the XY direction.
256 LEDs 53 are arranged and configured, and among the 256 LEDs 53 used in each display block 52, those having the same brightness are arranged to unify the brightness in the display block 52.

In this case, there is a difference in brightness between the display blocks 52, but this can be eliminated by operating a brightness adjusting circuit (not shown). That is, since characters, figures, etc. are displayed on the display board 51 by causing a pulse current for light emission to flow through the LED 53 and causing the LED 53 to flash and emit at a speed that does not cause the human eye to feel flicker.
The brightness adjustment circuit allows the display block 52 having a low brightness.
A pulse current having a wide pulse width is applied to the display block to increase the lighting time of the LED 53, while a pulse current having a narrow pulse width is applied to the display block 52 having a high brightness to shorten the lighting time of the LED 53. The difference in luminance between the two 52 is eliminated, and the luminance of the display panel 51 as a whole is made uniform.

With the above structure, 1536 (256 pieces × 6 digits) LEDs required for the entire display panel 51 are provided.
LED 53 having the same brightness for all 53
It was possible to unify the brightness of the entire display panel 51 much more easily than collecting.

[0006]

By the way, the display panel 51
When the luminance of the display block 52 of No. 1 is deteriorated due to the passage of time or the like, it is necessary to readjust the luminance by operating the above luminance adjusting circuit, but conventionally, the luminance adjusting circuit is operated on the back side of the display panel 51. Since there were some parts, the user went around the back of the display panel 51 to operate the brightness adjustment circuit. However, when the display panel 51 is installed on the wall surface of a building or on the rooftop, it is not easy to go around to the back surface of the display panel 51, and it is also dangerous. Therefore, the operation operation of the brightness adjustment circuit is performed. It was difficult.

The present invention has been made to solve the above problems, and its purpose is to adjust the brightness of a display panel so that the brightness of the display panel can be easily adjusted from a remote location without wrapping around on the back surface of the display panel. To realize the method.

[0008]

In order to solve the above-mentioned problems, a method for adjusting the brightness of a display panel according to the present invention is formed by connecting a plurality of display blocks in which a plurality of light-emitting diodes having the same light-emission brightness are collected. A method of adjusting the brightness of the display board for making the brightness of the display blocks of the display board uniform, wherein a plurality of types of light emitting pulse currents to flow to the light emitting diodes in each of the display blocks are determined according to the width of the pulse width. In advance, the control unit sends a control signal to the display board side through a signal line to specify the type of the light emitting pulse current to be passed to the display block for adjusting the brightness and the light emitting diode in the display block. The light emitting diode in the display block designated by the control signal is supplied with a pulse current for light emission of the type designated by the control signal to reduce the lighting time of the light emitting diode. It is constructed by adjusting each indicate the block.

[0009]

According to the brightness adjusting method for a display board of the present invention, a plurality of light emitting pulse currents to be supplied to the light emitting diodes in each display block are determined according to the width of the pulse width, and the control is performed. The control signal that specifies the type of the light emitting pulse current to be supplied to the display block for adjusting the brightness and the light emitting diode in the display block is transmitted to the display panel side via the signal line, so that the signal line can be sent to the desired location. By wiring, the brightness of the display block of the display board can be remotely adjusted.

Further, on the display panel side, the lighting time of the light emitting diode is displayed by passing a pulse current for light emission of the type designated by the control signal to the light emitting diode in the display block designated by the control signal. Since it is adjusted for each block, a light emitting pulse current with a wide pulse width is passed to a display block having a light emitting diode with a low brightness to lengthen the lighting time of the light emitting diode and increase the brightness, while a light emitting diode with a high brightness is used. By passing a light-emitting pulse current having a narrow pulse width to the display block having the above, the lighting time of the light-emitting diode is shortened and the luminance is lowered, whereby the luminance between the display blocks can be made uniform.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for adjusting the brightness of a display board according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing an overall configuration of a display panel brightness adjusting method according to the present embodiment.
3 is an explanatory diagram showing the pulse width of the pulse current for light emission, FIG.
FIG. 4 is a block diagram of a method for adjusting the brightness of the display board of the present embodiment.

As shown in the schematic diagram of FIG. 1, the method of adjusting the brightness of the display board of this embodiment is such that a control signal is transmitted from the control section 1 to the display board 3 side through a digital line 2 as a signal line. ing.

Thus, the display board 3 has six display blocks 4
, Each display block 4 forms a single display digit, and the display board 3 shown in the figure is capable of displaying 6-digit characters and numbers.

In the display block 4, LEDs 5 as display elements are arranged and arranged in a matrix in a 16 × 16 = 256 matrix in the XY directions. Each display block 4
The LEDs 5 in the inside are configured by collecting LEDs having similar emission brightness when a current of the same strength is applied. Therefore,
Within each display block 4, variations in brightness do not occur.

A light emitting pulse current is passed through the LED 5 so that the LED does not feel flicker in the eyes.
By blinking and emitting 5 light, characters, numbers, etc. are displayed.

The brightness of the display blocks 4 varies from one display unit to another. However, as shown in FIG. 2, a pulse current a having a wide pulse width is passed through the display blocks 4 having a low brightness within a unit time. By increasing the lighting time of the LED 5 and flowing a pulse current b having a short pulse width to the display block 4 having high brightness to shorten the lighting time of the LED 5 within a unit time, the variation in brightness is eliminated, and display is performed. The brightness of the entire board 3 is made uniform.

The control unit 1, as shown in FIG.
A signal output unit 7 and an output interface 8 are provided.

Therefore, in this embodiment, the LED is previously used.
Several kinds of pulse currents to be supplied to the No. 5 are determined according to the width of the pulse width, and set values such as setting 1 and setting 2 are given to these. Then, when the display block 4 for adjusting the brightness and the data relating to the set value are input from the input unit 6, the display block 4 input from the signal output unit 7 is input.
And a digital control signal designating the set value thereof is output from the signal output unit 7.

The control signal is output to the digital line 2 via the output interface 8 for enabling the connection between the control unit 1 and the digital line 2 and transmitted to the display panel 3 side.

The transmitted control signal is input to the signal determiner 10 of each display block 4 via the input interface 9, as shown in FIG. This signal determiner 10
Determines whether or not the input control signal specifies the display block 4, and inputs the control signal to the setting storage unit 11 only when the control signal specifies itself.

The setting storage unit 11 stores all setting values and data relating to the pulse width of the pulse current corresponding to the setting values, and when a control signal is input, it corresponds to the setting value designated by the control signal. A data signal regarding the pulse width of the pulse current is transmitted to the brightness adjusting circuit 12.

The brightness adjusting circuit 12 determines the LED 5 based on the data signal relating to the pulse width of the transmitted pulse current.
The display driver 13 that performs the lighting drive controls the pulse width of the pulse current supplied to the LED 5. As a result, the pulse current having the pulse width as the set value input from the input unit 6 of the control unit 1 can be passed through the LED 5.

As described above, in this embodiment, the control signal designating the set value for determining the pulse width of the pulse current flowing from the control unit 1 to the display block 4 for adjusting the brightness and the LED 5 in the display block is digital. Since it is configured to be transmitted to the display panel 3 side through the line 2, even if the display panel 3 is on the roof or wall of a building, by wiring the digital line 2 to a desired place, each can be safely and easily. The brightness of the display block 4 can be adjusted remotely. In particular,
The control unit 1 is configured as a portable device,
If there is a display panel 3 for adjusting the brightness, if the control unit 1 is carried to a place where the display panel 3 is located and connected to the digital line 2 to adjust the brightness, one control unit 1 can display a plurality of display panels 3.
It is possible to manage the brightness of the.

Although the signal line is the digital line 2 in this embodiment, an analog line such as a telephone line can be used as the signal line if a modem (modulator / demodulator) is used.

Further, in each display block 4, when the control signal designating itself is transmitted, the setting storage section 11 outputs the data concerning the pulse width of the pulse current corresponding to the set value designated by the control signal to the brightness adjusting circuit. Then, the brightness adjusting circuit 12 controls the pulse width of the pulse current supplied to the LED 5 by the display driver 13 for lighting and driving the LED 5, based on the transmitted pulse width data of the pulse current. As a result, the pulse width of the pulse current flowing through the LED 5 is changed according to the difference in luminance between the display blocks 4 LE.
Since the lighting time of D5 can be adjusted for each display block 4, the difference in luminance between the display blocks 4 can be eliminated.

[0026]

According to the brightness adjusting method for a display board of the present invention, a plurality of kinds of light emitting pulse currents to be flown to the light emitting diodes in each display block are determined according to the width of the pulse width, and the control unit controls the brightness. Since the control signal that specifies the type of the light emitting pulse current to be applied to the display block that performs brightness adjustment and the light emitting diode in the display block is transmitted to the display panel side via the signal line, the display panel is displayed on the roof or wall of the building. Even if installed, the brightness of the display block of the display panel can be easily adjusted remotely by wiring the signal line to a desired location.

Further, on the display panel side, the lighting time of the light emitting diode is displayed by passing a pulse current for light emission of the type designated by the control signal to the light emitting diode in the display block designated by the control signal. Since it is adjusted for each block, a light emitting pulse current with a wide pulse width is passed to a display block having a light emitting diode with a low brightness to lengthen the lighting time of the light emitting diode and increase the brightness, while a light emitting diode with a high brightness By passing a light-emitting pulse current having a narrow pulse width to the display block having the above, the lighting time of the light-emitting diode is shortened and the luminance is lowered, whereby the luminance between the display blocks can be made uniform.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration of a display board brightness adjusting method according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a pulse width of a pulse current for light emission.

FIG. 3 is a block diagram of a method for adjusting the brightness of a display board showing an embodiment of the present invention.

FIG. 4 is a schematic view of a display panel in a conventional brightness adjusting method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 control part 2 digital line 3 display panel 4 display block 5 LED 6 input part 7 signal output part 8 output interface 9 input interface 10 signal judging device 11 setting storage part 12 brightness adjustment circuit 13 display driver

Claims (1)

(57) [Claims] 1. A display panel brightness adjustment method for aligning the luminance between display blocks mutual display panel which is formed by connecting a plurality display block collection of a plurality of light emitting diodes having the same degree of emission luminance, Light-emitting diodes in each of the above display blocks
Increase the pulse width of the pulse current for light emission to the ion
Select multiple types depending on the space, and adjust the brightness from the control unit.
Display block to be performed and light emitting diode in the display block
A control signal that specifies the type of pulse current for light emission to be supplied to the display panel is transmitted to the display panel side via a signal line, and on the display panel side, the light-emitting diode in the display block designated by the control signal is sent.
The pulse current for light emission of the type specified by the control signal above.
The method for adjusting the brightness of a display panel is characterized in that the lighting time of the light emitting diode is adjusted for each display block by flowing the current.