KR101327289B1 - OLED lighting apparatus for automatic controling brightness of OLED pannels - Google Patents

Abstract

The present invention relates to an OLED lighting apparatus for automatically adjusting the brightness of OLED panels, and more particularly, having a photo detector on the side of a plurality of OLED panels to measure the brightness of the OLED panels without being exposed to the outside. And a control unit in which the brightness of the sides of the OLED panels and the brightness of the front are matched with each other, and the controller receives the brightness of the sides of each OLED panel as an electric signal, and then automatically adjusts the brightness of each OLED panel to a predetermined reference value. The present invention relates to an OLED lighting device that automatically adjusts brightness of OLED panels.

Description

OLED lighting apparatus for automatic controling brightness of OLED pannels

The present invention relates to an OLED lighting apparatus for automatically adjusting the brightness of OLED panels, and more particularly, having a photo detector on the side of a plurality of OLED panels to measure the brightness of the OLED panels without being exposed to the outside. And a control unit in which the brightness of the sides of the OLED panels and the brightness of the front are matched with each other, and the controller receives the brightness of the sides of each OLED panel as an electric signal, and then automatically adjusts the brightness of each OLED panel to a predetermined reference value. The present invention relates to an OLED lighting device that automatically adjusts brightness of OLED panels.

In general, OLED lighting panels are luminaires that implement the functions of existing luminaires by using OLED. Since OLEDs have low power consumption and high durability, various types of OLED lighting panels that can replace existing luminaires are studied. And commercialized.

In addition, the OLED lighting panel is an indoor lighting panel installed indoors such as indoor spaces such as houses and offices or subway stations, screen doors, theater posters, external lighting panels installed outside, and small and medium size POP (point of purchase; purchase). Point of view advertisement).

In addition, the OLED lighting panel is provided in plurality, and the plurality of OLED lighting panels may be connected in series or in parallel to be installed in one frame. In this case, a large amount of light may be emitted in a large area. .

On the other hand, when using a lighting fixture consisting of a plurality of OLED lighting panel, each OLED lighting panel has a different brightness of each OLED lighting panel due to characteristics such as driving voltage or lifespan, so the quality of the lighting fixture is deteriorated. In addition, as time passes, there is a problem in that the brightness difference between the respective OLED lighting panel increases.

In addition, after detecting the brightness difference of the OLED lighting panels by using a light detector for measuring the brightness of the light may be provided with an automatic compensation circuit for compensating the brightness difference between the OLED lighting panels, the photodetector is the OLED lighting Since the brightness must be measured in front of the panels, a portion of the OLED lighting panel is covered by the photodetector, and the problem of deterioration of beauty occurs.

The inventors can uniformly control the brightness of a plurality of OLED panels, the photodetector for measuring the brightness of each OLED panel can measure the brightness of each OLED panel without being exposed to the outside, As a result of research efforts to be able to automatically adjust the brightness to a predetermined reference value, the technical configuration of the OLED lighting device for automatically adjusting the brightness of the OLED panel has been developed to complete the present invention.

Accordingly, an object of the present invention is to provide an OLED lighting device that automatically adjusts the brightness of a plurality of OLED panels, and automatically adjusts the brightness of OLED panels that set the brightness of the OLED panels to a predetermined reference value.

In addition, another object of the present invention is to automatically measure the brightness of the OLED panel capable of measuring the brightness of the OLED panel without the optical sensor for detecting the brightness of the OLED panel does not cover the front of the OLED panel and exposed to the outside. It is to provide an OLED lighting device to adjust.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the present invention provides a plurality of OLED panels; A plurality of driving circuits connected to the OLED panels one-to-one and outputting driving power so that each OLED panel emits light; A photo detector formed on each OLED panel and measuring brightness of each OLED panel and outputting the electrical signals; And a controller configured to receive the electrical signals from the photodetector to calculate brightness of each OLED panel, and to adjust brightness of each OLED panel by varying a current of driving power supplied to each OLED panel. Provide lighting devices.

In a preferred embodiment, the photodetector is formed on the side of each OLED panel, to measure the brightness of the light irradiated to the side of each OLED panel.

In the preferred embodiment, the brightness of the light irradiated to the front of the OLED panel and the brightness of the light irradiated to the side of the OLED panel is matched with each other and stored, the brightness of the side of the OLED panel is the electrical signal Calculate the brightness of each OLED panel.

In a preferred embodiment, the control unit outputs a control signal to each driving circuit unit so that the brightness of each OLED panel is set to a predetermined reference brightness, the current of the driving power is varied.

In a preferred embodiment, the control unit calculates the average brightness of the OLED panels, and outputs a control signal to each drive circuit unit so that the brightness of each OLED panel is set to the average brightness to vary the current of the drive power.

In an exemplary embodiment, an optical connection unit connects one side of each OLED panel and the photodetectors to each other, and light irradiated from the side of each OLED panel is input, and the input light is output to the photodetector. It includes more.

In a preferred embodiment, the optical connection portion is formed so that the cross-sectional area is widened in the other direction connected to the photodetector at one side connected to the side of each OLED panel.

In a preferred embodiment, the driving circuit portions are connected in parallel to each other so as not to affect the driving power supplied to the other OLED panel when adjusting the brightness of one OLED panel.

In a preferred embodiment, the rectifier for rectifying the commercial power input from the outside to output to the input power; further comprising, the driving circuit portion to switch the input power to output the drive power and the drive power to a constant current Control to be supplied.

The driving circuit unit may include a variable resistor connected to the controller and configured to adjust a current of the driving power according to the control signal input from the controller.

In a preferred embodiment, the driving circuit unit controls the current of the driving power supply does not exceed a predetermined threshold.

In a preferred embodiment, the driving circuit unit is provided with a constant current driver IC, the constant current driver IC: an input terminal connected to the positive terminal of the rectifying unit for receiving the input power; An output terminal connected to the negative terminal of the OLED panel to output the driving power; A first current adjusting stage connected to the variable resistor and controlling a current of the input power source; A second current control stage connected to the controller and configured to receive a control signal of the controller and adjust a current of the driving power output from the output terminal; And a ground terminal connected to the negative terminal of the control unit.

The present invention has the following excellent effects.

First, according to the OLED lighting apparatus according to an embodiment of the present invention, the light detector for measuring the brightness of the plurality of OLED panels and the brightness of each OLED panel measured by the light detector as an electric signal and receives each OLED panel Since the controller is configured to adjust the current of the driving power to be set to the reference brightness, the brightness of the plurality of OLED panels is automatically and uniformly controlled, and the effect of precisely controlling the brightness of each OLED panel can be obtained.

In addition, according to the OLED lighting apparatus according to an embodiment of the present invention, the light detecting unit for measuring the light of the OLED panel is provided on the side of the OLED panel to measure the light irradiated to the side of the OLED panel, Since the side brightness of the OLED panel and the front brightness of the OLED panel are previously matched and stored in the controller, the brightness of the OLED panel can be measured without damaging the aesthetics as the light detector is not exposed to the outside without covering the OLED panel. The effect can be obtained.

1 is a block diagram showing an OLED lighting apparatus according to an embodiment of the present invention.
FIG. 2 is a circuit diagram illustrating an OLED lighting apparatus of FIG. 1. FIG.
3 is a perspective view illustrating an optical connection of FIG. 1.
4 shows the brightness of light emitted to the front and side of the OLED panel.

Although the terms used in the present invention have been selected as general terms that are widely used at present, there are some terms selected arbitrarily by the applicant in a specific case. In this case, the meaning described or used in the detailed description part of the invention The meaning must be grasped.

Hereinafter, the technical structure of the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Like reference numerals designate like elements throughout the specification.

1 is a block diagram showing an OLED lighting apparatus according to an embodiment of the present invention, Figure 2 is a circuit diagram showing the OLED lighting apparatus of Figure 1, Figure 3 is a perspective view showing the optical connection of Figure 1, Figure 4 is A diagram showing the brightness of light emitted to the front and side of the OLED panel.

1 to 3, an OLED lighting apparatus according to an embodiment of the present invention includes a plurality of light sources emitting light, and automatically adjusts the brightness of each light source so that the brightness of each light source is uniform. The brightness difference between the light sources is reduced, and includes an OLED panel 110, a driving circuit unit 120, a light detector 130, a controller 140, an optical connector () and a rectifier 160.

The OLED panel 110 is substantially provided to emit light, and may be formed of an organic light emitting device that emits light when a current flows in a fluorescent or phosphorescent organic compound. In addition, the OLED panel 110 may be formed such that a plurality of OLEDs are arranged at regular intervals on a PCB substrate.

In addition, the OLED panel 110 can be driven at a low voltage and can be manufactured in a thin film type, and when used as an illumination device, there is an advantage of reducing the volume and power consumption.

In addition, the OLED panel 110 is provided in plurality so as to obtain a high luminous flux, and each OLED panel 110 may be attached to form a row or a row on the upper surface of the frame.

In addition, the frame supports the OLED panels 110 and may be made of various shapes and materials according to the size and shape of the lighting device, and may form an appearance of the finished manufactured product.

The driving circuit unit 120 is to supply driving power to the OLED panels 110, and a plurality of driving circuit units 120 are provided to be connected to each OLED panel 110 in a one-to-one manner. Outputs the OLED panel 110 to emit light, and includes a variable resistor 121, an input terminal 122, an output terminal 123, a first current regulating stage 124, a second current regulating stage 125, and Ground terminal 126.

In addition, when the current of the driving power output from the driving circuit unit 120 is varied, the brightness of each OLED panel 110 is adjusted, and each driving circuit unit 120 is connected to each other in parallel to one OLED panel. When adjusting the brightness of the 110 is formed so as not to affect the driving power supplied to the other OLED panel (110).

In addition, the driving circuit unit 120 may be provided to switch the input power input from the rectifying unit 160 to be described later to output to the driving power, even if the load fluctuates or the voltage of the input power fluctuates. Control to supply constant current.

In addition, the driving circuit unit 120 receives a control signal from the controller 140 to be described later to switch the input power to vary the current of the driving power, wherein the current of the driving power exceeds a preset threshold. Control not to. In addition, the threshold means the maximum value of the current of the driving power source. In addition, the driving circuit unit 120 may be provided as a constant current driver IC.

In addition, the variable resistor 121 controls the current of the driving power by adjusting the size of the input power, and receives the control signal from the controller 140 to be described later to adjust the size of the input power. In addition, when the current of the driving power is controlled by the variable resistor 121, the brightness of the OLED panel 110 becomes bright or dark.

In addition, the input terminal 122 is connected to the plus terminal of the rectifier 160 to be described later, and is provided to receive the input power.

In addition, the output terminal 123 is connected to the negative terminal of the OLED panel 110 and is provided to output the driving power to the OLED panel 110.

In addition, the first current adjusting stage 124 is connected to the variable resistor 121, and is provided to adjust the current of the input power by the control of the variable resistor 121.

In addition, the second current control stage 125 is connected to the control unit 140 to be described later, is provided to receive the control signal to adjust the current of the driving power output from the output terminal 123.

In addition, the ground terminal 126 is connected to the negative terminal of the controller 140, which will be described later, and is provided to output surplus power of the driving circuit unit 120.

The photodetector 130 measures the brightness of each OLED panel 110 and outputs them as electrical signals. The photo detector 130 may be formed in each OLED panel 110 and provided as a photosensor.

In addition, the light detector 130 may be formed on the side of the OLED panel 110 without being formed in front of the OLED panel 110 or on the light emitting surface, and may be embedded in a frame to which the OLED panel 110 is attached. Is formed. That is, the light detector 130 measures the light leaking to the side of the OLED panel 110 without covering the OLED panel 110.

In addition, the photodetectors 130a, 130b, 130c, 130d, 130e, and 130f are provided in plural numbers and are provided on the side surfaces of the OLED panels 110, and the light emitted from the side surfaces of the OLED panels 110. The electrical signals are output according to the brightness.

In addition, each of the photodetectors 130 outputs each electric signal to the controller 140, which will be described later, so that the brightness of the OLED panel 110 can be calculated.

The controller 140 receives the electrical signals to calculate the brightness of each OLED panel 110, and outputs a control signal to the driving circuit unit 120 to adjust the brightness of each OLED panel 110. According to the control signal, the driving circuit unit 120 varies the current of the driving power supplied to each of the OLED panels 110, and the brightness of each OLED panel 110 is changed while the current of the driving power is varied. The control unit includes a power input terminal 141, a power output terminal 142, a signal input terminal 143, and a signal output terminal 144.

In addition, the controller 140 may be provided as a micro controller unit, and the micro controller unit is supplied to each OLED panel 110 according to an electric signal input from each of the driving circuit units 120. It is controlled to increase or decrease the current of the driving power source.

In addition, the controller 140 is stored in advance the brightness of the light irradiated to the front of the OLED panel 110 and the brightness of the light irradiated to the side of the OLED panel 110 is matched with each other, the controller 140 Calculates the brightness of the light irradiated to the front of each OLED panel 110 from the electrical signal input from each of the photodetector 130.

In addition, each of the electrical signals input to the controller 140 may be a signal in which the light detector 130 measures brightness of side surfaces of the OLED panels 110.

In addition, the brightness of the light irradiated to the front of the OLED panel 110 and the brightness of the light irradiated to the side of the OLED panel 110 may be provided with a storage means such as a memory (memory).

In addition, the control unit 140 stores the reference value brightness of the OLED panel 110 in advance, and outputs the control signal to each of the driving circuit units 120 so that the brightness of each OLED panel 110 is the reference value. The current of the driving power source may be varied to set the brightness.

In addition, the controller 140 may receive the electrical signals and calculate the average brightness of the OLED panel 110 as the reference value brightness, and output the control signal to each of the driving circuit units 120 to display the respective OLED panels. The current of the driving power source may be varied such that the brightness of the 110 is set to the reference brightness.

In addition, the power input terminal 141 is connected to the rectifier 160 to be described later, it is provided to receive the input power.

In addition, the power output terminal 142 is provided with a positive terminal and a negative terminal and connected to the driving circuit unit 120, and is provided to output the input power to the driving circuit unit 120.

In addition, the signal input terminal 143 is connected to each of the photodetectors 130 and is provided to receive the electrical signals from each of the photodetectors 130.

In addition, the signal output terminal 144 is connected to the driving circuit unit 120, and is provided to output the control signal to the driving circuit unit 120, in particular, the variable resistor 121 of the driving circuit unit 120 and It is connected to control the variable resistor 121 by outputting the control signal.

The optical connection unit 150 is provided to connect the OLED panel 110 and the photodetector 130 to each other, and the light irradiated from the OLED panel 110 may be output to the photodetector 130. One side 151 is coupled to the side of the OLED panel 110 and the other side 152 is coupled to the photodetector 130.

In addition, the light irradiated from the side of the OLED panel 110 is input to one side 151 of the optical connector 150, and the input light passes through the inner side of the optical connector 150 to the photodetector. A plurality of photo detectors 130a, 130b, 130c, 130d, 130e, and 130f, which are output to 130, are provided in the OLED panels 110, respectively.

In addition, the optical connection unit 150 may be formed of a material that allows light to pass through, such as an optical space, or pass through the light, and also, the light input to the one side 151 It may be provided with a reflector on the inner surface so that it can pass without being lost.

Meanwhile, although the thickness of the OLED panel 110 and the thickness of the photodetector 130 may be the same as each other, the thickness of the photodetector 130 is usually thicker. Accordingly, the optical connection part 150 may be formed to have a wider cross-sectional area in the direction from the one side 151 to the other side 152.

That is, the optical connection unit 150 is provided so that the cross-sectional area of the one side 151 corresponds to the thickness of the OLED panel 110, and the cross-sectional area of the other side 152 to correspond to the light detection unit 130. Could be.

Accordingly, the optical connector 150 may efficiently connect the OLED panel 110 and the photodetector 130 which are relatively thinner than the optical detector 130, and have a side surface of the OLED panel 110. The light irradiated from may be easily transmitted to the photodetector 130. In addition, the light detector 130 may accurately measure the brightness of light emitted from the side of the OLED panel 110 through the light connector 150.

The rectifier 160 rectifies the commercial power and outputs the input power. The rectifier 160 may be configured to switch the commercial power to output the input power, and to use the semiconductor device including a power transistor as a switch. It may be provided to switch the above-mentioned power source.

In addition, the rectifier 160 converts the commercial power source, which is an AC power source, into a DC power source, and then converts the DC power source into a high frequency AC power source having a predetermined frequency. After the adjustment to the output through the rectification and smoothing circuit may be provided to output to the input power source of direct current.

In addition, the rectifier 160 may be provided as a switching mode power supply (SMPS) of the switching method.

Referring to FIG. 4, the controller of the OLED lighting apparatus according to the exemplary embodiment of the present invention is a side brightness S, which is the brightness of light emitted to the side of the OLED panel 110, and the front of the OLED panel 110. The front brightness F, which is the brightness of the irradiated light, is matched with each other and stored. The controller may calculate the front brightness F by receiving the side brightness S measured by the light detector as an electric signal.

In addition, the front brightness F of the OLED panel 110 becomes brighter as the driving voltage and current increases, which indicates that the side brightness S of the OLED panel 110 also becomes bright.

In addition, Table 1 below represents the front brightness F, the side brightness S, the driving voltage and the current of the OLED panel 110, and a white OLED panel having a size of 70 × 70 mm 2 was used.

The driving voltage (V) Current (mA) Front brightness (cd / ㎡) Side brightness (cd / m²) 7 75 1260 24 7.5 136 2230 77 8 228 3670 127 8.5 280 4400 161 9 430 6240 220

In addition, as shown in Table 1, the front brightness F and the side brightness S of the OLED panel 110 are increased in the same manner, and the front brightness F is increased when the driving voltage and the current supply amount are increased. And side brightness S is also increased. That is, when the front brightness F of the OLED panel 110 decreases, the side brightness S also decreases in the same manner.

In addition, the controller 140 of the OLED lighting apparatus according to an embodiment of the present invention matches the driving voltage, the current, the front brightness (F) and the side brightness (S) of the OLED panel 110, respectively, and stores in advance, The front brightness F is calculated by receiving the side brightness S measured by the light detector 130 as an electric signal.

In addition, the controller 140 stores a specific front brightness F as a reference value brightness, adjusts the front brightness F of the OLED panel 110 to the reference value brightness, and supplies it to the OLED panel 110. The front brightness F of the OLED panel 110 may be increased by increasing the amount of current.

For example, when the reference brightness of the OLED panel 110 is set to a value of 3670 cd / m 2 and the front brightness F decreases to a value of 2230 cd / m 2 after a predetermined time, the light detector 130 The measured side brightness S is measured to decrease from 127 cd / m 2 to 77 cd / m 2.

In addition, the controller 140 receives the side brightness S reduced to 77 cd / m 2 from the photodetector 130 as an electrical signal and calculates the front brightness, thereby front brightness F of the OLED panel 110. ) Is reduced to 2230 cd / m 2.

In addition, the controller 140 increases the front brightness F of the OLED panel 110, wherein the front brightness F of the OLED panel 110 is a value of 3670 cd / m 2, which is the reference brightness. To increase the current supplied to the OLED panel 110 to have a.

In addition, the OLED panel 110 increases the front brightness (F) and the side brightness (S) as the current supplied increases, wherein the control unit 140 is the photodetector 130 in the OLED panel The current is controlled to be supplied until the side surface brightness S of 110 is measured at a value of 127 cd / m 2.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, Various changes and modifications will be possible.

110: OLED panel 120: drive circuit portion
121: variable resistor 122: input terminal
123: output stage 124: first current regulation stage
125: second current control stage 126: ground terminal
130: light detector 140: control unit
141: power input terminal 142: power output terminal
143: signal input terminal 144: signal output terminal
150: optical connection portion 160: rectifier

Claims (12)

A plurality of OLED panels;
A plurality of driving circuits connected to the OLED panels one-to-one and outputting driving power so that each OLED panel emits light;
A photo detector for measuring brightness of each OLED panel and outputting the electrical signals;
A controller configured to receive the electrical signals from the photodetector to calculate brightness of each OLED panel, and adjust brightness of each OLED panel by varying a current of driving power supplied to each OLED panel; And
And an optical connection unit connecting one side of each OLED panel and the photodetectors to each other, the light irradiated from the side of each OLED panel is input, and the input light is output to the photodetector.
The optical connecting unit is an OLED lighting apparatus, characterized in that the cross-sectional area is widened in the other direction connected to the light detection unit from one side connected to the side of each OLED panel.
The method of claim 1,
The light detecting unit is formed on the side of each OLED panel, OLED lighting apparatus, characterized in that for measuring the brightness of the light irradiated to the side of each OLED panel.
The method of claim 2,
The control unit stores the brightness of the light irradiated to the front of the OLED panel and the brightness of the light irradiated to the side of the OLED panel to be matched with each other. OLED lighting device, characterized in that for calculating the brightness of the panel.
The method of claim 3, wherein
And the control unit outputs a control signal to each driving circuit unit so that the brightness of each OLED panel is set to a predetermined reference brightness, and varies the current of the driving power.
The method of claim 3, wherein
The control unit calculates an average brightness of the OLED panels, and outputs a control signal to each drive circuit unit so that the brightness of each OLED panel is set to the average brightness to vary the current of the driving power source .
delete delete 6. The method according to any one of claims 1 to 5,
The driving circuit units are connected in parallel to each other, OLED lighting apparatus characterized in that it does not affect the driving power supplied to the other OLED panel when adjusting the brightness of one OLED panel.
The method of claim 8,
Rectifying unit for rectifying the commercial power input from the outside to output to the input power; further comprising,
And the driving circuit unit switches the input power to output the driving power and controls the driving power to be supplied with a constant current.
The method of claim 9,
The driving circuit unit is connected to the control unit, OLED lighting apparatus comprising a; variable resistor for adjusting the current of the driving power in accordance with the control signal input from the control unit.
The method of claim 10,
And the driving circuit unit controls the current of the driving power not to exceed a preset threshold.
The method of claim 11, wherein the driving circuit portion is provided with a constant current driver IC,
The constant current driver IC:
An input terminal connected to the plus terminal of the rectifying unit to receive the input power;
An output terminal connected to the negative terminal of the OLED panel to output the driving power;
A first current adjusting stage connected to the variable resistor and controlling a current of the input power source;
A second current control stage connected to the controller and configured to receive a control signal of the controller and adjust a current of the driving power output from the output terminal; And
And a ground terminal connected to the negative end of the control unit.

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