TW201028031A - A method and an electronic device for improving the optical uniformity of tiled OLED lighting sources - Google Patents

Abstract

A method for improving the uniformity of at least one optical property of a tiled OLED lighting source comprising at least two OLED tiles, the method comprising: applying electrical power to the OLED tiles with a power proving means, the power providing means comprising a control means adapted for controlling the electrical power to each of the OLED tiles, measuring at least one optical property of each of the OLED tiles as a function of their respective electrical power to determine at least one electro-optical property of each OLED tile, modifying the control means using the electro-optical properties for compensating the effect of the variation of the electro-optical properties on the uniformity of the optical properties of the OLED tiles.

Description

201028031 VI. Description of the Invention: [Technical Field] The present invention relates to an organic light-emitting diode, and more particularly to an OLED light-emitting source constructed from a plurality of organic light-emitting diode (OLED) tiles. [Prior Art] An organic light emitting diode (OLED) device is composed of two electrodes and an organic light emitting layer. The organic layer is disposed between the two electrodes. One electrode is the anode and the other electrode is the cathode. The organic layer is configured such that when the anode has a voltage that is sufficiently positive relative to the cathode, a hole is injected from the anode and electrons are injected from the cathode. The necessary voltage bias is dependent on the materials used for the organic layers. The holes and electrons recombine within the organic layer to induce an excited state in a molecule comprising one of the organic layers. Light is emitted during the process of returning the excited molecule to its ground state. The anode is typically made of a high work function material such as a transparent conductive oxide (TCO), and the cathode is typically made of a highly reflective material such as aluminum or silver. However, there are many different electrode designs that allow light to pass through the cathode, the anode, or both the cathode and the anode. The organic layer may be composed of a single organic film, or it may be composed of a stack of one of a plurality of organic films. OLED devices are useful because the indicators and displays can be constructed from an array of patterned OLED devices. A large area OLED illumination source for general illumination can be constructed from a plurality of smaller OLED tiles. The OLED tiles can be configured in a matrix form. This is called OLED tile and can have several advantages over a single monolithic large area OLED illumination source, such as: a significant increase in production yield, can reduce power loss by series connection 142896.doc 201028031, increase the fault tolerance of the illuminating device And the geometric appearance of the tiled OLED lamp can be easily customized, because the LED tiles which are formed into squares such as strips and different aspect ratios can be used. While OLED monuments have significant advantages, a major unresolved problem is the different electro-optical properties of the individual tiles. OLED tiles, even from the same production lot, typically have variations in brightness associated with current or voltage functions due to manufacturing tolerances. For a light source having only one LED tile, the brightness variation of the OLED device itself is less important. For tiled OLED sources, human observers can easily notice changes in the optical properties between tiles. For example, when two OLED tiles are in close proximity, the human eye can detect small changes in brightness. An unimportant solution to avoid such sudden changes in brightness in a monumental 〇Led array is to use only tiles having similar properties. However, this method is costly because it requires a time consuming selection process. U.S. Patent Application Serial No. 2/5/i34525 A1 describes a system and teaches a method for controlling and calibrating a large tiled OLED emission display. However, this does not apply to OLED illumination sources. SUMMARY OF THE INVENTION The present invention provides a method, an electronic device, a tiled LED light source, and an OLED kit. Embodiments of the invention are given within the scope of the appended claims. Embodiments of the present invention address the power of each single LED tile of the configuration by using drive electronics for the LED illumination source, thereby minimizing at least one optical property change of the OLED illumination source The above question 142896.doc 201028031 questions. The optical properties of OLED tiles as defined herein are the luminosity, irradiance, or spectral properties of light emitted from an OLED tile. When the power applied to an OLED tile changes, the optical properties will change. One of the OLED tiles defined herein is an OLED device that is placed in a pattern with other OLED devices. The terms OLED device and OLED tile can be used interchangeably. Examples of light metrics are light energy, luminous flux, light intensity, luminosity, illuminance, light emissivity, and luminous efficiency. The light metrics illustrate the different sensitivities of the human eye to visible light of different wavelengths. It is advantageous to minimize variations in one or more light metrics because the illuminating sources will be perceived as having a uniform brightness. Examples of radiosity properties are radiant energy, radiant flux, radiant intensity, radiance, irradiance, radiation divergence, radiation emissivity, radiation imaging, spectral radiance, and spectral illuminance. It is useful to make the irradiance properties more uniform when the amount of energy originating from a source of illumination needs to be uniform (such as for one source of lithography). A spectrometer can be used to measure the spectral properties of the light emitted by the OLED tile. For the illuminating source, an important amount is the perceived color of the illuminating source. OLED tiles can be constructed to change the color of the emitted light when a current or voltage is applied. Multilayer OLED tiles can also be constructed in which the layers of the OLED tile produce light having different spectral emissions. The color of the OLED tile can be controlled by controlling the power to the different layers. It should be understood that the OLED tiles described herein may also refer to OLED tiles having multiple layers. The electro-optical properties defined herein are those between the electrical power applied to an OLED tile and the optical properties produced. Electrooptical properties are typically expressed as one of the optical properties associated with the applied voltage and/or current function. An example is that the light emissivity is a function of the applied current. Electro-optic 胄 is an inherent property of each OLED chip' and even within the same manufacturing lot, the electro-optical properties between different tablets are different. Controls of embodiments of the invention electronically compensate for changes in the electro-optical properties of the tiles to increase the uniformity of the resulting optical properties. The amplitude of the voltage or current applied to an OLED tile can be controlled. This affects the amount of light produced and sometimes affects the spectral content (color) of the light. The OLED tiles can also be turned on or off repeatedly at a higher rate than the visual persistence. This changes the perception of the brightness of the tile. Either or both of these techniques can be used to adjust the optical properties of the OLED tiles. Using both technologies at the same time has the advantage of being able to control more than one amount. An example is to independently control the luminosity and color of the OLED tile. With regard to multi-layer 〇led tiles, in addition to each-single layer m-rate and/or independent duty cycle on and off, the current or electro-grain or voltage can be controlled for each-single layer. In this regard, there are more than one solution for achieving the desired luminosity and color. In one embodiment, one of the main aspects of the present invention is to determine the automatic brightness level of the latter to achieve an average level. Brightness 1 · The average brightness level of each single brick 2 in a OLED array 2. The average brightness level of a plurality of bricks is adjusted. The minimum deviation of the driving current per singly brick is 142896.doc 201028031 This procedure can be repeated to determine these Other or multiple optical properties of the OLED tile. Embodiments of the present invention provide a method for improving the uniformity of at least one optical property of a tiled OLED illumination source. The tiled OLED light source comprises at least two OLED tiles. The method includes several steps. In a first step, power is applied to the OLED tiles having a power supply member that includes a control member adapted to control the power to each of the OLED tiles. Controlling the power to each OLED tile as defined herein means controlling the voltage, current, or voltage and current to each OLED tile. It should also be understood that controlling the power to each OLED can also pulse power to the OLEDs at a particular frequency and duty cycle. In the case of multilayer OLED tiles, controlling power is understood to control the power to each layer. In the next step, at least one optical property of each OLED tile is measured as a function of the power applied to the OLED tile. This step is used to determine at least one electrooptical property of each OLED tile. Finally, the control members are modified using electro-optical properties to compensate for the effects of changes in electro-optical properties on the uniformity of the electrical properties of the OLED tiles. This method has the advantage of making one or more optical properties of the OLED illumination source more uniform. Even in a single manufacturing period, changes in electro-optical properties can occur. When the OLED tiles are in close proximity, the human eye is extremely susceptible to discerning differences in such brightness or color. By modifying the control members, the difference in the electro-optical properties of the individual OLED tiles can be compensated for. The compensation method depends on one of the measured optical properties or multiple optical properties. If the luminosity is measured or 142896.doc 201028031 brightness, then the luminosity is usually proportional to the applied current. In this case, only the optical and electrical measurement methods are required. However, if different types of OLED devices are used, such as current-dependent color and current-dependent brightness OLED devices, it may be desirable to measure a more complex function depending on the optical properties of the power. The measurement methods that must be compensated for multi-layer 〇led devices can also be extremely complicated. The control member can be executed in a variety of ways. It can be a simple analog circuit, or it can be a more complex computer or microprocessor control system. In the other embodiments, the optical properties measured as 'luminosity' are luminosity. This is advantageous because the luminosity is a perceived brightness. The human eye is extremely sensitive to changes in brightness, especially when we bring large bricks closer to each other. It is extremely easy for the human eye to perceive the difference in luminosity. An advantage of this method is that if one of the optical properties is luminosity, the method compensates for differences in luminosity between different OLED monuments and the lamp will present a more uniform appearance to the human eye. In another embodiment, one of the optical properties is a color. This is advantageous for compensating colors, because in terms of lamps, one of the characteristics of the human eye is also color. If two OLED tiles are close to each other and they have different spectral or color properties, then this will be extremely noticeable, compensating for variations in color to make a tiled OLED illumination source appear more uniform and Satisfied appearance. In another embodiment, the power to each of the 0 LED tiles is controlled by adjusting the current or voltage applied to each of the OLED tiles. The diode has a current and voltage characteristic. It is customary to use current to control a diode or an OLED type device, but there is also an equivalent method of controlling the voltage. One of the advantages of controlling the current or voltage applied to each OLED tile is that it can be compared to the measured optical properties and can be constructed as a function of the optical properties or properties. This allows for compensation for variations in these optical properties. In another embodiment, the power to each OLED tile is controlled by repeatedly switching the OLED tiles on or off. The switching of these OLED tiles is faster than the visual persistence. This is an advantage because it can be used to reduce the perceived brightness of the OLED tile when it is faster than the visual persistence switch. Brightness can be adjusted by adjusting only the current, but some OLED tiles also have a color change depending on the current. By adjusting the duty cycle of the power applied to the OLED tile, this allows the brightness to be controlled and then the color controlled by controlling the current. This approach is also advantageous because only a single constant current source is required. This is more economical than having multiple adjustable current or voltage sources. In another aspect, the present invention provides an electronic device for supplying a tiled OLED lighting device. The OLED lighting device comprises at least two OLED tiles. The electronic device includes a power supply member adapted to supply power to each of the OLED tiles and a power supply member including a control member for regulating power. This is used to compensate for the effects of changes in at least one of the electro-optical properties of the OLED tiles. This is useful for improving the uniformity of at least one optical property of the OLED light-emitting device. This electronic device has the advantage that it has one of the components for compensating for changes in the electro-optical properties of the OLED tiles. This is advantageous because compensating for the electro-optical properties of the OLED device allows the OLED illuminator to measure the optical properties of the OLED illumination device more uniformly. In another embodiment, the compensated optical quality luminosity and/or color is compensated by the electronic device. Compensation for luminosity is an advantage because it is equivalent to our perception of brightness. When the lights are close to each other, the difference in brightness can be severely disturbed or can be easily noticed by a person. The compensation for this makes the lamp more aesthetically pleasing. The color or spectral composition of the light from the lamp is also the same. The human eye will easily notice small changes in the color of the individual 〇LED monuments that make up the OLED lighting device. In another aspect, the power supply member includes a switch member adapted to repeatedly switch the LED tile on or off at a frequency that is faster than visual persistence. The advantages of switching on and off the LED tiles faster than the visual persistence have been described. The power supply member is adapted to switch power to each OLED tile at an independent frequency and/or independent duty cycle. This has the advantage of changing the perceived brightness. When the duty cycle is changed, the period of time during which the OLED tile is illuminated can be changed. In another embodiment, the electronic device has a power supply member that includes a set of power converters adapted to supply power to the OLED tiles. There is a power converter for each OLED tile, and the power converters are adapted to regulate the current or voltage applied to each OLED tile. This is advantageous as it allows for compensation of the electrooptical properties of the OLED tiles. Xianyu has mentioned the advantages of this. In another embodiment, the electronic device control member is an analog electronic circuit. For many OLED devices, the optical properties are electrically controlled to brightness or luminosity. For many of these devices, the luminosity is only proportional to the current. This means 142896.doc 201028031 The method of compensating for this change in electro-optical properties is relatively simple. This can be adjusted by an operator with one of the adjustment buttons on the power supply.

to make. Analog circuits can also be used to compensate for OLED devices such as color control. In another embodiment, the electronic device has a control member that includes a logic circuit. The electronic devices further include a _ lookup table. The look-up table is adapted to provide the (four) component shape values to compensate for variations in the electro-optical properties of the tablet. This can be performed using a microcontroller or it can also be performed using a computer. The use of a "look up table" is extremely advantageous because the electro-optical properties of individual QLED tiles can be pre-measured and then used to construct a look-up table for compensating for such changes in electro-optical properties. (4) When operating the lamp, the optical properties studied can be hooked. Use—The lookup table allows for extremely complex compensation schemes. If we want to compensate both the brightness and the color of a tablet, then the lookup table can contain information about the current required to apply the power to the OLED tablet, the required duty cycle, or both. In the example, the control component is a logic circuit, and the electronic device further includes a training software module level. The training software module provides values available for the control member to compensate for changes in the electro-optical properties of the LED tiles. The training software module can be executed by a neural network. Other possible examples of trainable software modules are those constructed using the following techniques: fuzzy logic, Bayesian analysis (Bayesian), principal component analysis, perceptual learning algorithms, linear discriminant analysis, regression analysis, transformation Mileage Analysis (ANOVA), Factor Analysis, and Correlation Memory Regression Analysis. 'Electric 142896.doc 12 201028031 Stream and color. One. The relationship between the optical properties studied by Bardot can be extremely complex. Trainable software modules will allow for the control of such complex relationships in an efficient manner. It is also because the manufacturer can measure the OLED bricks. The electro-optical properties of the sheet, and the use of this to train the software module, and simply install the software module in the logic circuit. The trainable software module can be coupled to a control system operative to adjust to the power of the LED tiles. This can be used to train the 〇LED illumination system when operating the 、LED, and it can also be used with the control system to adjust the optical properties. In another embodiment, the electronic device is further comprised of one of the selected optical values for selecting an optical property of the OLED illumination source. In addition, the control member is adapted to minimize variations in the OLED tiles from the desired optical values. This is an advantage because it allows the source to darken, brighten, or change the color of the light. It is common to add a selection member to adjust the optical properties of the light. In another aspect, the present invention provides a tiled 〇LED illumination source comprising two or more OLED tiles, and when the two or more 〇LED tiles are connected to a 6 hp power supply component The electronic device described above is included. This configuration is advantageous because it is essentially a ,1^ 〇 lamp that consists of 〇 LED tiles and electronic devices that compensate for the changes in the electro-optical properties of individual OLED tiles. In another aspect, the present invention provides an LED lighting kit comprising two or more OLED monuments and the electronic device described above. This is an advantage. This is because the OLED illumination source may not be constructed when the 〇LED illumination source as described above is handed over to the customer 142896.doc 201028031. For example, a very large OLED tile can be used to replace the ceiling tiles in a room, and then the ceiling tiles can be used to illuminate the OLED tiles. The OLED tiles can be first installed in the ceiling and then connected to the ceiling. These electronic devices. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described by way of example only and with reference to the accompanying drawings in which: FIG. 1 shows an implementation of a method for improving the uniformity of at least one optical property of a tiled OLED illumination source example. The method consists of applying power to the OLED tile 100, measuring at least one optical property of each OLED tile 102, and then modifying the control member 104. The optical properties of the OLED tiles are measured as a function of the voltage and/or current applied to the OLED tablets. This was used to determine the electrooptical properties of each OLED tile. Once the electro-optical properties of the OLED tiles have been determined, they can be used to modify the control member. While the electrooptical properties of such OLED tiles are inherent to the tiles, the optical properties of the tiles change as the current or voltage across a particular tile changes. For example, when the current through an OLED tablet increases, the brightness generally increases. Modification of the control member based on the measured electro-optical properties can result in a more uniform optical quality of the illumination source. 2 shows an embodiment of an exemplary tiled OLED lighting device 200. The OLED lighting device includes a frame 202 and OLED tiles 1.1, 1_2, 1.3, 1.4, 2.1, 2.2, 2.3, 2.4, 3.1, 3.2, 3.3, 3.4 disposed in a rectangular pattern. A tiled OLED light source comprises a 142896.doc • 14· 201028031 monumental OLED light emitting device 200 and is adapted to supply the OLED tablets ii 1.2, 1.3, 1.4, 21, 2 2, 2 3, 2 4, 3", 3 2 J, 3.4 Power drive electronic equipment. The OLED tiles are labeled as Mi 2, U, 1_4, 2.1, 2.2, 2·3, 2 4, 3", 3 2, 3 3, and 3 4 . The decimal point then displays the number and the number after the decimal point. Used as a coordinate for representing an array of OLED monuments 1.1, 1.2, 1.3, n 2 | 2·2 2.3 2.4, 3. 1 , 3.2, 3.3, 3.4. The optical properties can be measured practically, placed in an array and in a row, and formed into a matrix. The device 〇LED illuminator also displays 204. ? To calculate the optical property f measured in a matrix towel, the factor of the change in the correction property can be calculated. As a sound melon -

To be an example, a tiled 〇 LED device 200' is made of 3x4 〇 LED tiles! ",! 2. i 3, 3 2.4 3.1, 3.2, 3.3, 3.4 construction (as shown in Figure 2) and assume that for each individual): ^^, slice (,m) change current efficiency ebn,m. The efficiency is shown in a matrix seal. The matrix size is s=nxM, where N=3’ M=4, S = 12 :

Cd X cb ; f40 38 55 40 41 45 43 41 41 38 42 41 Average current efficiency Cbav has the following formula: 1 N u ΐίΜ'Σ 2 should be used for ^ example cut as follows - average efficiency level v - 4? 1 -

« tU cbavr = 42 1 — A J42896.doc 15. 201028031 Assuming the desired luminous intensity LI=400 cd, the average efficiency is 42a cd/A ' The expected driving current is iav=400 cd/(42.1 Cd/A) =9 5 △. Then, the luminous intensity of each brick obtained is 匕川^^二“—仏^: '380 361 523 380,

Utile = 3卯 428 409 390 〇i , 390 361 _399 390> To minimize the change in brightness, each current In>m is adjusted according to the efficiency of the tile:

In, m=Iav*cbav/cbn so that the matrix of the drive current becomes r10 10.5 7.3 10 ^

ί = 9.8 8.9 9.3 9.8 A ^9.8 10.5 9.5 9.8^ / Ο

The brightness of the resulting partial OLED tiles 1.1, 1.2, 1.3, 1.4 2.2, 2.3, 2.4, 3.1, 3.2, 3.3, 3.4 is of course unchanged: B〇ptn, m=cdn, m* In, m, / lion 400 400 400,

Bojrt = 400 400 400 400 «ί ^400 400 400 400 J The result is a homogeneous OLED illumination source. The implementation of this technology requires measuring the efficiency of OLED monument 13, 1.4 ^ 丄.i, 1.2 ^ JL · t ' 2.1, 2.2, 2.3, 2.4, 3.1, 3.2, 3.3, 3 4 ^ ^ 古乂4 and controlling OLED tiles 1.1, 1.2, 1.3, 1.4, 2.1, 2.2, :? 1 n . 'The average current of 厶3, 2.4, 3.1, I·2, 3·3, 3.4. The tablet efficiency can be measured repeatedly during operation of the illumination device, or during manufacture of the illumination device, such as via a light (flux) sensor. If the 142896.doc -16- 201028031 tile efficiency is measured only once, the measured tile efficiency is stored in a look-up table (LUT) or the tile efficiency of the measurement is continuously monitored to make it available for modification. • Average drive current. Figure 3 summarizes the procedure explained above. Figure 3 shows a method for adjusting the current to an OLED tile to improve the uniformity of at least one optical property. The method consists of measuring 3 Torr using current efficiencies stored or measured for each tile. A reference value of 3 〇 2 is used for one of the desired illuminances, and then the two values are used to calculate a reference value for the 〇4 drive to participate in the current. The reference values for driving the current are then stored 306 and the values of the drive current Irfn 308 are placed in the memory using the initial value Irfn 316 to operate the lamp. This is used to activate the modulator 3 14 ' and then adjust the current of the lamp 3 to 2 by the controller, and the value of the memory 3 〇 8 can be read from the memory 310 while the lamp is being operated and used for adjustment. To control the modulation rate 312 or duty cycle of the current through the OLED tiles. To implement the method illustrated in Figure 3, a current modulator is required that adjusts the individual 砖 tile current to the calculated reference value. Figure 4 shows an example. Figure 4 shows an embodiment of a secondary brick OLED illumination source having any number of OLED traces 408, 410, 412. The xenon LED illumination source is comprised of a power supply 400 for supplying power to a power converter 402. The power converter 402 then transmits power to both the tiled LED device 4〇6 and the controller 404. The tiled OLED device is comprised of n different 〇led tiles 408, 410, 412. The figure shows a 〇Led tile 1 408, an OLED tile 2 410 and a last OLED tablet number N 412. The figure shows an electrical circuit of any number of OLED tiles 408, 410, 412 of 142896.doc -17-201028031. The OLED tiles 408, 410, 412 are connected in series with wires for connecting field effect transistor (FET) 426, 428, 430 switches. The controller 404 includes a reference value 414 coupled to the modulator control 41 8 and a look up table (LUT) 416. The modulator control is coupled to the power converter 402. The reference value 414 is assigned to one of the modulator controls 418 for setting the desired optical properties of the tiled OLED device 406. The LUT 416 contains the values used by the modulator control 418 to properly control the power delivered to each OLED tablet 408, 410, 412. The © modulator control 41 8 is coupled to N different switch control units 420, 422, 424. The switch control units 420, 422, 424 are used to control the FETs 426' 428, 430 ° to have a switch control unit 420, 422, 424 and one of the OLEDs 426, 410, 412 FETs 426, 428, 430 . The FETs 426, 428, 430 are connected in parallel with their OLED tiles 408, 410, 412. FET 1 426 is connected in parallel with OLED block 1 408. FET 2 428 is connected in parallel with OLED tablet 410, and the like. the last one

The Q FET N 430 is connected in parallel with the OLED tile digital N 412. Each of the FETs 426, 428, 430 and the OLED tablet 408, 410, 412 are connected in series with each other. When one of the FETs is activated, current is passed through the FETs 426, 428, 430 without passing through the OLED monuments 408, 410, 412. Thus, the FETs 426, 428, 430 can be used to switch the OLED tiles 408, 410, 412 on and off. The modulator control controls the brightness of the OLED tiles 408, 410, 412 by rapidly switching between switching on and off. The circuit and control configuration described in this embodiment has the advantage of using a single power supply 142896.doc • 18· 201028031 points, and then the switches are only used to adjust the LED tiles 4〇8, 4丨〇, 412 Whether it is turned on or off at a certain time. The brightness is adjusted by the duty cycle of OLED tiles 408, 410, 412 at a rate that is faster than visual persistence. The system consists of a power supply 400 that delivers a constant average current to a tiled 〇led device 406 in which all of the tiles are connected in series. When the OLED monuments 408, 410, 412 bypass elements 426, 428, 430 are arranged in parallel such that the bypass elements 426, 428, 430 are closed, the average current of the respective tiles can be varied. The current through each of the OLED tiles 408, 410, 412 is proportional to the duty cycle dn, where dn = 100% corresponds to reaching a maximum current, ie the bypass elements 426, 428, 430 remain open, and dn = 〇 〇/. Equivalent to a bypass element 426, 428, 430 remains off so that no current flows through an arbitrary LED tile 408, 410, labeled 412. During a given switching period Tn, the average current flowing through each OLED tablet 408, 410, 412 can be changed by changing the duty cycle dn of each OLED tablet 408, 410, 412 η. The effective current Φ is 1avn=Iav*dn/10〇, where lav is the drive current delivered by the power supply. The drive current itself is determined by a reference value of 4丨4, which is either built-in or adjustable, for example via a control or illumination network interface. Figure 5 shows a different embodiment of the invention. In this embodiment, the 4 OLED tiles 510, 512, 514 are controlled by independent power converters 502, 504, 506. A power converter 5 〇 2, 504, 506 is defined herein as a controller that is tuned to adjust the current or voltage applied to a single LED tile 51 〇 , 512 , 5 14 'cycle switching on and off application Power to the OLED tiles 510, 512, 514, or both. There is a supply of power to 142896.doc -19- 201028031 converters 502, 504, 506 to any number N of different power converters 502, 504, 506 one of the main power supplies 500. Only power converter 1 502, power converter 2 504 and last power converter number N 5 06 are shown in this figure. There is a tiled OLED device 508 comprising an arbitrary number N of different 01^0 tiles 501, 512, 514. The power converter 1 502 is connected to the 01^0 tile 1 510, the power converter 2 504 is connected to the OLED tile 2 512 and the last power converter, the power converter N 506 is connected to the OLED tile number N 5 14. There is a main controller 516 for controlling each of the power converters 502, 504, 506. The main controller 516 uses a reference value 518 and a lookup table 520 to calculate the appropriate power to be delivered to each of the OLED tiles 510, 512, 514. The main controller 516 is coupled to each of the power converters 502, 504, 506 by a communication line 522. The communication line 522 allows the main controller 516 to control the power applied to each of the OLED tiles 510, 512, 514. The communication line 522 can be analog or digital. Figure 6 shows an embodiment of the generalization of the OLED illumination source structure that adjusts the current to control the brightness of the OLED monuments 610, 612, 614. This embodiment consists of a power supply 600 that provides a constant current. This is connected to a power bus 602. The power bus 602 is coupled to N different current modulators 604, 606, 608, current modulator 1 604, current modulator 2 606, and current modulator N 608. The power bus 602 is connected such that each current modulator 604, 606, 608 accepts the same current. This can be performed by connecting the current modulators 604, 606, 608 in a series circuit. There are OLED tiles 510, 512, 514 corresponding to one of each current modulator 604, 606, 608. Current modulator 1 604 is connected to OLED tile 1 610, current 142896.doc -20- 201028031 modulator 2 6G6 is connected to 〇LED tablet 2 612, and current modulator (10) is connected to 0 tile N 614. To control the duty cycle, there are N different reference values 616. The reference values 616 are modulated on the N different communication lines 618 with a per-current modulation, and the communication lines 618 can be analogous to the lines or digital signals. For a digital signal, communication may be over N different communication lines 618 or may be multiplexed on one or more communication lines 618.

Figure 5 shows a power supply structure that allows for individual control of the tile currents. A master-slave concept is applied herein, wherein when the master controller 516 calculates and transmits the reference value 518 to the slave power converters 502, 5〇4, 5〇6, the slave power converters 502, 504, 506 generate Individual monumental currents. The power supply architecture of Figures 4 and 5 can be summarized as shown in Figure 6, which includes: • a power supply 400, 402, 500, 600 • a set of current modulators 426, 428, 430, 502, 504, 506, 604 ' 606 ' 608 • a set of current reference values 414, 518, 616 according to a set of reference values 3 414 2, 414, 5 1 8 , 616 calculated according to the method of FIG. 3, the current modulators 426, 428, 430, 502, 504, 506, 604, 606, 608 adjust the current delivered to the individual 〇 LED tiles 4 〇 8, 410, 412, 510, 512, 514, 610, 612, 614. The reference values 302, 414, 518, 616 can be stored in the memory 3〇8 as a LUT 416, 520, executed in hardware, and/or continuously calculated. The reference values can be implemented in the hardware by using a fine-tunable resistor. 142896.doc -21 - 201028031 [Simplified Schematic] FIG. 1 is a flowchart of the method in Patent Application No. 1, FIG. FIG. 3 is a flow chart showing an embodiment of a method for improving the uniformity of luminous intensity by adjusting the current to the OLED tiles, FIG. A schematic diagram of one embodiment of a tiled OLED illumination source to the current of each OLED tile, FIG. 5 is a schematic diagram of an embodiment of a tiled OLED light source that controls the amplitude of power to each OLED tile Figure 6 is an idealized overview of one embodiment of a tiled OLED illumination source that is tuned to the current of each OLED tile. [Main component symbol description] 1.1 OLED tile in column 1 and row 1 OLED tile in column 1 and row 2 OLED tile 1.4 in column 1 and row 3 in column 1 and row 4 OLED Tiles 2.1 OLED Tiles in Columns 2 and 1 OLED Tiles in Columns 2 and 2 2.3 OLED Tiles in Columns 2 and 3 2.4 OLEDs in Columns 2 and 4 Tile 3.1 OLED tile in column 3 and row 1 OLED tile in column 3 and row 2 OLED tile in column 3 and row 3 3.4 OLED tile in column 3 and row 4 142896.doc -22- Applying power to the OLED tile to determine at least one optical property of each OLED tile. Modifying the control member. The OLED illuminator frame is electrically connected to each OLED tile. The reference value of the current efficiency illuminance is calculated. The storage reference value of the current is stored in the reference value in the memory. The memory is adjusted to the current of the OLED tile. The starter is set to the reference value of the drive current. The power converter controller is paved OLED light-emitting device OLED tile 1 OLED tile 2

OLED Tile N Reference Value Lookup Table (LUT) -23- Modulator Control Switch Control Unit 1 Switch Control Unit 2 Switch Control Unit N FET 1 FET 2 FET N Power Supply Power Converter 1 Power Converter 2

Power Converter N Tiled OLED Light Emitting OLED Brick 1 OLED Brick 2

OLED tile N main controller Reference value Lookup table (LUT) Communication line Power

Power Bus Current Modulator 1 Current Modulator 2 Current Modulator N -24- 201028031 610 612 614 616 618

OLED tile 1 OLED tile 2 OLED tablet N reference value Communication line 142896.doc -25-

Claims (1)

201028031 VII. Patent application scope: 1. A method for improving the uniformity of at least one optical property of a tiled OLED illumination source, the illumination source comprising at least two OLED tiles (1.1, 1.2, 1.3, 1.4, 2.1, 2.2, 2.3, 2.4, 3.1, 3.2, 3·3, 3.4, 408, 410, 412, 510, 512, 514, 610, 612, 614), the method comprising: applying power (100) to having one The OLED tiles of the power supply components (4〇〇, 402, 500, 502, 504, 506, 000, 602), the power supply component including a control component adapted to control power to each OLED tablet (404, 414, 416, 418, 516, 518, 520, 522, 616, 618) measuring at least one optical property (1〇2) of each OLED tile associated with an individual power function of each OLED tile To determine at least the electro-optical properties of each of the LED tiles, the control member (1〇4) is modified by electro-optical properties to compensate for the effect of changes in the optical properties on the uniformity of the optical properties of the 0 LED tiles. The method of claim 1 wherein one of the optical properties is luminosity. The method of 3 or 2, in which the optical power of the OLED tile is controlled by flow or electric dust. The power of the OLED tile is determined by the method of claim 1 'where to - each adjustment to the electricity applied to each - OLED tablet 5. For example, the method of clearing item 1, "China to every - 142896.doc 201028031 The OLED tablets are switched on and off to control (3 1 2), wherein the switching of the OLED tablets is faster than the visual persistence. 6. An electronic device for supplying power to a monumental 〇LED illuminating device (2〇〇, 4〇6, 508, 010, 612, 614) 'The illuminating device comprises at least two 〇 LED tiles (1.1 , 1.2, 1.3, 1.4, 2.1, 2.2, 2.3, 2_4, 3.1, 3·2, 3·3, 3.4, 408, 410, 412, 510, 512, 514 610, 612, 614), the electronic device includes a A power supply member (4〇〇, 4〇2, 500, 502 '504' 506, 600, 602) adapted to supply power to each OLED tile, the power supply member including a control member (404, 414) , 416, 418, 516, 518, 52 〇, 522, 616, 618) adapted to adjust the power supply member to compensate for the influence of changes in at least one electro-optical property of the OLED tablets, thereby improving the OLED illumination The uniformity of at least one optical property of the device. 7. The electronic device of claim 6, wherein the optical properties are luminosity and/or color. 8. The electronic device of claim 6 or 7, wherein the power supply member comprises a switch member adapted to switch on and off each of the OLED tiles at a frequency faster than the visual persistence (42〇, 422, 424, 426, 428, 430, 502, 5〇4, 506, 6〇4, 606, 608), wherein the power supply member is adapted to switch to each OLED at an independent frequency and/or an independent duty cycle . 9. The electronic device of claim 6 or 7, wherein the power supply member comprises a set of power converters (5, 2, 504, 506) adapted to supply power to the LED tiles, wherein each of the LEDs The tile has a power conversion 142896.doc 201028031, wherein the set of power converters is adapted to adjust the current or voltage applied to each of the 〇led tiles. 10. The electronic device of claim 6 or 7, wherein the control device is an analog electronic circuit. 11. The electronic device of claim 6 or 7, wherein the control component is a logical electrical circuit, the electronic device further comprising a lookup table (416, 52A) adapted to provide the control component for use The value is used to compensate for the change in the electro-optical properties of the #〇碑. The electronic device of claim 6 or 7, wherein the control component is a logic circuit, and the electronic device further comprises a training software module for providing a usable value of the control component to compensate the LED bricks The change in the electro-optical properties of the sheet. 13. The electronic device of claim 6 or 7, further comprising a selection member operable to select at least the optical properties of the OLED illumination source A desired optical value 'which allows the control member to be adapted to minimize variations in the OLED monument from the desired optical value. 14. A tiled OLED illumination source comprising at least two 碑led monuments and an electronic device according to any one of claims 6 to 13, wherein the slabs are connected to the power supply member. 15. An OLED lighting package comprising at least two OLED tablets and an electronic splicing according to any one of claims 6 to 13, wherein the 〇LE 〇 monument is adapted to be connected to the power supply member . 142896.doc