WO2011086176A1

WO2011086176A1 - Illumination device

Info

Publication number: WO2011086176A1
Application number: PCT/EP2011/050503
Authority: WO
Inventors: Huajian Fan; Yabin Luo; Canbang Yang; Zesheng Ye
Original assignee: Osram Gesellschaft mit beschränkter Haftung
Priority date: 2010-01-18
Filing date: 2011-01-17
Publication date: 2011-07-21
Also published as: CN102128360A

Abstract

The present application provides an illumination device, including: at least one first light-emitting unit; and at least one second light-emitting unit with a lower illumination power than that of the first light-emitting unit; wherein, the second light-emitting unit is arranged among the first light-emitting unit so that the illumination device is able to realize a uniform illumination.

Description

ILLUMINATION DEVICE

Field of the Invention

[0001 ] The present invention relates to an illumination device.

Background of the Invention

[0002] In order to obtain a desired illumination power, an illumination device may include a plurality of light-emitting unit and the illumination is realized by driving the plurality of light-emitting unit simultaneously.

[0003] Figure 1 is a cross-section diagram of an illumination device in the prior art. As shown in Figure 1, an illumination device 10 includes a plurality of light-emitting unit U1-U4 with the same light-emitting power. Apparently, Figure 1 is merely an exemplification and the illumination device 10 may include any other number of light-emitting units.

[0004] On the other hand, in order to obtain enough light-emitting power, the illumination device can be implemented with light-emitting units having a higher light-emitting power.

Summary of the Invention

[0005] The object of the present invention is to provide an illumination device which is able to provide a uniform illumination. Note that, the term "uniform" or "uniformity" means that the fluctuation of the illumination light emitted from the illumination device is small and does not intend to refer that the illumination light emitted from the illumination device has no intensity variation. In other words, the distribution of the intensity of the illumination light is approximately flat or is gradually changed from one position to another position. However, both the flat distribution and the gradually-changed distribution of the intensity of the illumination light are adapted to achieve the object of the pending application, i.e. make the distribution of the illumination light emitted from the illumination device become uniform as far as possible.

[0006] One embodiment of the present invention provides an illumination device, including at least one first light-emitting unit and at least one second light-emitting unit with a lower illumination power than that of the first light-emitting unit; wherein, the second light-emitting unit is arranged among the first light-emitting unit so that the illumination device is able to realize a uniform illumination. [0007] Another embodiment of the present invention provides a method for arranging an illumination device, including arranging at least one second light-emitting unit, which has a lower illumination power than that of a first light-emitting unit, among at least one first light-emitting unit, so as to make the illumination device be able to realize a uniform illumination.

[0008] According to the embodiments of the present application, the second light-emitting unit can compensate the "dark spot" or "intensity valley" in the illumination area of the first light-emitting unit so as to make the illumination become uniform. Brief Description of the Drawings

[0009] The present invention may be better understood by referring to the description hereinafter in combination with the drawings, wherein in the drawings, the same or similar reference signs are used to indicate the same or similar components. All the drawings and the detailed description are included in the specification and constitute a part of the specification, and are used to further present examples to illustrate the preferred embodiments of the invention and explain the principles and advantages of the invention. Wherein:

[0010] Figure 1 is a cross-section diagram of an illumination device in the prior art.

[0011] Figure 2 is a cross-section diagram of an illumination device according to the first embodiment of the present application.

[0012] Figure 3 is a cross-section diagram of an illumination device according to an embodiment of the present application.

[0013] Figure 4 shows an illumination effect of the illumination device shown in Figure 2 according to an embodiment of the present application and the illumination device shown in Figure 1 of the prior art.

[0014] Figure 5 shows the top view of the illumination device of an embodiment of the present application.

[0015] Figure 6 shows the top view of the illumination device of an embodiment of the present application.

[0016] Figure 7 shows the top view of the illumination device of an embodiment of the present application.

[0017] Figure 8 is a diagram showing the concept of the present application.

[0018] Figure 9 is a diagram showing the principle which is used to determine the number of the low power light-emitting units and the interval of the low power light-emitting units according to the light extraction angle of the low power light-emitting unit and the distance between the low power light-emitting unit and an light-diffusion apparatus.

Detailed Description of the Embodiments

[0019] Hereinafter, the embodiments of the present invention will be described in combination with the drawings. In view of clearness and conciseness, not all the features of the practical embodiments are described in the description. However, it should be understood that many decisions specific to the embodiments need to be made during the development of any practical embodiments, so as to achieve the specific objects of the developer, and these decisions may vary to some extent according to different embodiments. Further, it should be understood that although the developing work may be rather complicated and time-consuming, it is only a routine job for those skilled in the art who benefit from the disclosure of the present invention.

[0020] It should be further pointed out here that in the drawings, only the device structure closely related to the solution of the present invention is illustrated in the drawings, and other details having little relation with the present invention is omitted, so as to avoid making the present invention unclear due to unnecessary details.

[0021] The present application provides an illumination device, including at least one high power light-emitting unit and at least one low power light-emitting unit; wherein, the low power light-emitting unit is arranged among the high power light-emitting unit so that the illumination device is able to realize a uniform illumination.

[0022] Note that, in the present application, the illumination power of each high power light-emitting unit is not necessarily the same but may be different. For example, in order to implement a various illumination, different high power light-emitting units may have different illumination powers. The similar meaning is also applied to the expression "low power light-emitting unit", "first light-emitting unit" and "second light-emitting unit". Moreover, the meaning of the term "high power" and "low power" is relative, that is, the illumination power of some light-emitting unit is higher than that of other light-emitting unit, but it is not meant that the illumination power of the light-emitting unit is absolutely higher than or less than a certain value. Moreover, the term "high power" and "low power" relate to an overall comparison between for example the first light-emitting units (high power light-emitting units) and the second light-emitting units (low power light-emitting units). For example, when it is intended to implement an illumination in which the illumination power gradually changes from one side to another side, low power light-emitting units may be inserted into a sequence of high power light-emitting units according to the present application. Note that, it is possible that the illumination power of a low power light-emitting unit at one side is higher than that of a high power light-emitting unit at another side.

[0023] According to the first embodiment of the present application, the high power light-emitting units are arranged into a one-dimensional array. In this case, at least one low power light-emitting unit is arranged between every two high power light-emitting units so that the illumination device can realize a uniform illumination.

[0024] According to the second embodiment of the present application, the high power light-emitting units are arranged into a two-dimensional array. In this case, the low power light-emitting units are arranged among the high power light-emitting units so that the illumination device can realize a uniform illumination.

[0025] Preferably, a structure (such as curve, arc, sphere, spirality and the like) may be formed based on the one-dimensional array or the two-dimensional array for different application.

Embodiment 1

[0026] In the first embodiment of the present application, the high power light-emitting units are arranged into a one-dimensional array. Preferably, at least one high power light-emitting units are arranged in one line and at least one low power light-emitting unit is arranged between every two high power light-emitting units so that the illumination device can realize a uniform illumination.

[0027] Figure 2 is a cross-section diagram of an illumination device according to the first embodiment of the present application.

[0028] As shown in Figure 2, the illumination device 20 includes a plurality of high power light-emitting units H1-H4 and a plurality of low power light-emitting units L1-L4, wherein, one low power light-emitting unit is arranged between every two high power light-emitting units.

[0029] Note that, the number of the high power light-emitting units is shown as 4, the number of the low power light-emitting units is shown as 3 and the number of the low power light-emitting units arranged between every two high power light-emitting units is shown as 1 for clarification. However, the present application is not limited herein. The number of the high power light-emitting units, the number of the low power light-emitting units and the number of the low power light-emitting units arranged between two high power light-emitting units may also be any other numbers. For example, Figure 3 shows a cross-section diagram of an illumination device according to another embodiment of the present application. In the example shown in Figure 3, the number of the low power light-emitting units arranged between high power light-emitting units H2 and H3 which are spaced with a long interval is two while the number of the low power light-emitting units arranged between high power light-emitting units H3 and H4 which are spaced with a short interval is one. Figure 3 is merely an example and the present application is not limited to the configuration as shown in Figure 3.

[0030] Preferably, the low power light-emitting unit is not necessarily arranged in the line connecting two high power light-emitting units. For example, when arranging two low power light-emitting units between two high power light-emitting units, the low power light-emitting units may be arranged beside the line connecting two high power light-emitting units. Moreover, the low power light-emitting units may have different light-emitting power. For example, one low power light-emitting unit may be arranged between two high power light-emitting units and another low power light-emitting with a lower power may be arranged between the low power light-emitting unit and the high power light-emitting unit so as to further uniform the illumination.

[0031] The light emitting unit shown in Figure 2 may be any suitable light-emitting device. Preferable, the light emitting unit is light-emitting diode (LED). In the case that the light emitting unit is LED, any colour LED may be used.

[0032] In an embodiment of the present application, the high power light-emitting units and the low power light-emitting units are LEDs of the same colour. For example, the high power light-emitting units and the low power light-emitting units are white LEDs, red LEDs or blue LEDs.

[0033] In another embodiment of the present application, the high power light-emitting units and the low power light-emitting units are LEDs of different colours. For example, the high power light-emitting units are white LEDs and the low power light-emitting units are red LEDs so as to obtain a good color mixture.

[0034] Moreover, for convenience, it is shown in Figure 2 that the high power light-emitting units and the low power light-emitting units are equally spaced and the low power light-emitting unit is arranged at the center of two high power light-emitting units. However, the present application is not limited herein. The high power light-emitting units and the low power light-emitting units may not be equally spaced and the low power light-emitting unit may not be arranged at the center of two high power light-emitting units. Moreover, in the case that a plurality of low power light-emitting units are arranged between two high power light-emitting unit, the plurality of low power light-emitting units may be equal-spaced or not be equal-spaced.

[0035] Figure 4 shows an illumination effect of the illumination device shown in Figure 2 according to the present application and that of the illumination device shown in Figure 1 of the prior art. In particular, the left part of Figure 4a shows the top view of the illustration device shown in Figure 2 according to an embodiment of the present application and the right part of Figure 4a shows the top view of the illustration device shown in Figure 1 according to prior art; and the left part of Figure 4b shows the illumination effect of the illustration device shown in Figure 2 according to an embodiment of the present application and the right part of Figure 4b shows the illumination effect of the illustration device shown in Figure 1 according to the prior art. Additionally, in Figure 4a, the larger block represents the high power light-emitting unit and the smaller block represents the low power light-emitting unit.

[0036] As can be seen from Figure 4, the illumination device according to the present application as shown in Figure 2 realizes a more uniform illustration because the illumination light of the low power light-emitting unit compensate for the dark spot between two high power light-emitting units.

[0037] Preferably, as shown in Figure 2, the illumination device according to the first embodiment of the present application further includes a substrate 22 which is electrically connected to the high power light-emitting unit and the low power light-emitting unit so as to supply power for and support the high power light-emitting unit and the low power light-emitting unit. The substrate may be any suitable substrate which is adapted to electrically connect to the high and low power light-emitting units and support the high and low power light-emitting units. For example, the substrate may be a rigid substrate such as Printed Circuit Board (PCB) for LED tubular lighting, or a flexible substrate such as cores for LED tube lighting.

[0038] Preferably, any suitable connection may used for the high power light-emitting units (such as HI to H4) and the low power light-emitting units (such as LI to L3) as shown in Figure 2. For example, the high power light-emitting units may be connected in parallel or in series (not shown in Figure 2) and the low power light-emitting units may be connected in parallel or in series (not shown in Figure 2).

[0039] Preferably, the illumination device according to the present application may further include a heat-dissipating unit, a lamp shade and an interface unit.

Embodiment 2

[0040] The difference between the first embodiment of the present application and the second embodiment only lies in that, the high power light-emitting units are arranged in a two-dimensional array in the second embodiment. In the following, the difference between the first embodiment and the second embodiment will be discussed in detail and repeated descriptions are omitted herein.

[0041] In the second embodiment of the present application, the high power light-emitting units are arranged in a two-dimensional array. The two-dimensional array may be any suitable array. For example, the two-dimensional array may be an array including a plurality of lines or be an array including at least one array cell.

[0042] In the case that the two-dimensional array includes a plurality of lines, each line may be the one-dimensional array according to the first embodiment of the present application so that the illumination device can realize a uniform illumination. Alternatively, the two-dimensional array may include at least one line of high power light-emitting unit and at leas one line of low power light-emitting unit which is arranged between every two lines of the high power light-emitting unit. In other words, it can be understood that, the high power light-emitting unit and the low power light-emitting unit in the first embodiment are extended to the line of high power light-emitting unit (i.e. high power light-emitting unit column or row) and the line of low power light-emitting unit (i.e. low power light-emitting unit column or row) respectively.

[0043] Figure 5 shows the top view of the illumination device 50 of an embodiment of the present application. In Figure 5, reference sign H represents the high power light-emitting unit and reference sing L represents the low power light-emitting unit. As shown in Figure 5, the plurality of light-emitting unit is arranged into a two-dimensional array including a plurality of lines. In each line of the array, at least one low power light-emitting unit is arranged between every two high power light-emitting units.

[0044] Figure 6 shows the top view of the illumination device 60 of another embodiment of the present application. In Figure 6, reference sign H represents the high power light-emitting unit and reference sing L represents the low power light-emitting unit. As shown in Figure 6, the two-dimensional array includes at least one line of high power light-emitting unit and at least one line of low power light-emitting unit which is arranged between the two lines of high power light-emitting unit.

[0045] Moreover, Figures 5-6 are examples only and the present application is not limited to the detailed configuration shown in Figures 5-6, the number of the elements, the number of the lines and the interval between the elements may be other suitable values.

[0046] Because the low power light-emitting units are arranged among the high power light-emitting units, the illumination device arranged in two-dimensional array can realize a uniform illumination.

[0047] Alternatively, in another embodiment of the present application, the two-dimensional array includes a plurality of array cell and the low power light-emitting unit is arranged in the middle of the array cell so that the illumination device including the array cells can realize a uniform illumination. The low power light-emitting unit may also be arranged in the array cell in other manners.

[0048] The array cell may have any suitable shape, such as rectangle, triangle, hexagon and the like.

[0049] Figure 7 shows the top view of the illumination device 70 of an embodiment of the present application. In the example as shown in Figure 7, the two-dimensional array includes array cells of triangle (as indicated by dot dash line). In Figure 7, reference sign H represents the high power light-emitting unit and reference sing L represents the low power light-emitting unit.

[0050] As shown in Figure 7, the low power light-emitting unit is arranged in the center of the array cell of triangle. Thus, the illumination area of the high power light-emitting unit with poor intensity at the middle of the array cell can be compensated by the low power light-emitting unit. Thus, a uniform illumination is realized.

[0051] Figure7 only shows an example and the present application is not limited to the detailed configuration shown in Figure 7, the number of the elements, the shape of the array cell and the space between the elements may be other suitable values.

[0052] Similar to the first embodiment, the illumination device according to the second embodiment of the present application may further include a substrate which is electrically connected to the high power light-emitting unit and the low power light-emitting unit so as to supply power for and support the high power light-emitting unit and the low power light-emitting unit. The substrate may be a rigid substrate or a flexible substrate.

[0053] Moreover, similar to the first embodiment, in the illumination device according to the second embodiment of the present application, any suitable connection may used for the high power light-emitting units and the low power light-emitting units. For example, the high power light-emitting units may be connected in parallel or in series and the low power light-emitting units may be connected in parallel or in series.

[0054] Moreover, similar to the first embodiment, the illumination device according to the second embodiment of the present application may further include a heat-dissipating unit, a lamp shade and an interface unit.

Relationship between the high power light-emitting unit and the low power light-emitting unit

[0055] As stated above, according to the embodiments of the present application, the low power light-emitting units are used for compensating for the illumination area of the high power light-emitting units. Figure 8 shows the concept of the present application.

[0056] In Figure 8, the horizontal axis represents the spatial position and the ordinate axis represents the relative intensity of illumination light. The solid line shows the intensity distribution of the illumination light in the case that the high power light-emitting units operate, the dash line shows the intensity distribution of the illumination light in the case that the low power light-emitting units operate and the dot dash line shows the intensity distribution of the illumination light in the case that the high and the low power light-emitting units operate. As can be seen from Figure 7, the low power light-emitting unit compensates for the poor illumination region of the high power light-emitting unit, so that the poor illumination region of the high power light-emitting unit is properly compensated.

[0057] When arranging the high power light-emitting units and the low power light-emitting units, many factors may be considered for adjusting the position and number of the lower power light-emitting units and the high power light-emitting units so as to realize a uniform illumination. For example, the position and the number of the low power light-emitting units are determined according to the illumination power of the low power light-emitting unit, the light extraction angle of the low power light-emitting unit, the ratio between the illumination power of low power light-emitting unit to that of the high power light-emitting unit or the distance between the low power light-emitting unit and the light-diffusion apparatus.

[0058] For example, in the case that the number of and the position of the low power light-emitting unit are fixed, the light extraction angle of the low power light-emitting unit and the distance between the low power light-emitting unit and light-diffusion apparatus can be adjusted so as to obtain a good compensation effect. Figure 9 shows the affection to the compensation effect caused by the light extraction angle of the low power light-emitting unit and the distance between the low power light-emitting unit and light-diffusion apparatus. In Figure 9, the reference sign P represents the light-diffusion plate and H and L represent the high power light-emitting unit and the low power light-emitting unit respectively.

[0059] As shown in Figure 9, when the low power light-emitting unit L is at position b, the low power light-emitting unit L can make a sufficient compensation for the poor illumination region of the high power light-emitting unit with the light extraction angle Θ1. However, if the low power light-emitting unit L is arranged at position a which is closer to the light-diffusion plate, the low power light-emitting unit L need a larger light extraction angle Θ2 so as to make a good compensation for the poor illumination region of the high power light-emitting unit. Thus, in the case that the light extraction angle of the low power light-emitting unit is fixed, the distance between the low power light-emitting unit and the light-diffusion plate or the number of the low power light-emitting units may be increased or decreased so as to achieve a good compensation. Similarly, in the case that other factors are fixed, the light extraction angle of the low power light-emitting unit may be adjusted.

[0060] In the embodiment shown in Figure 9, the high power light-emitting units and the low power light-emitting units are arranged in view of the area which is compensated by the low power light-emitting units. Moreover, the high power light-emitting units and the low power light-emitting units may also be configured in view of the illumination intensity. For example, the number of the low power light-emitting units and the interval between the low power light-emitting units may be determined according to the ratio between the light intensity of the low power light-emitting unit to the light intensity of the high power light-emitting unit.

[0061] In an embodiment of the present application, when different high power light-emitting units have different illumination powers, more low power light-emitting units may be arranged near the high power light-emitting unit with higher illumination power.

[0062] In another embodiment of the present application, when the ratio between the light intensity of the high power light-emitting unit to that of the low power light-emitting unit is large, more low power light-emitting units may be arranged between high power light-emitting units.

[0063] The above-mentioned factors are examples only. The relationship (such as position relationship and the quantity relationship) between the low power light-emitting unit and the high power light-emitting unit may also be determined based on other factors.

[0064] The processing for determining the relationship (including the position relationship and the quantity relationship) of the high power light-emitting unit and the low power light-emitting unit or determining the light extraction angle of the low power light-emitting unit, the distance between the low power light-emitting unit and light-diffusion apparatus may be implemented with any conventional computing method with reference to Figures 8-9 and repeated descriptions thereof are omitted. Alternatively, the specification and configuration of the high power light-emitting unit and the low power light-emitting unit may also be determined according to the above factors through experiments.

Other embodiments

[0065] Based on above description, the present application further discloses a method for configuring an illumination device. The method includes: arranging at least one low power light-emitting unit among at least one high power light-emitting unit which has a higher illumination power than that of the low power light-emitting unit, so as to realize a uniform illumination. Preferably, the high power light-emitting unit may be arranged into a one-dimensional array or a two-dimensional array.

[0066] Preferably, in the case that the high power light-emitting unit is arranged into the one-dimensional array, at least one low power light-emitting unit is arranged between every two high power light-emitting units.

[0067] Preferably, in the case that the high power light-emitting unit is arranged into the two-dimensional array including at lest one array cell, at least one low power light-emitting unit is arranged in the array cell.

[0068] Preferably, in the case that the high power light-emitting unit is arranged into the two-dimensional array including at lest two lines, in each line, at least one low power light-emitting unit is arranged between every two high power light-emitting units.

[0069] Preferably, in the case that the high power light-emitting unit is arranged into at least two lines, at least one line of low power light-emitting unit is arranged between every two lines of the high power light-emitting unit.

[0070] Preferably, the power of the low power light-emitting unit, the extraction angle of the low power light-emitting unit, the number of the low power light-emitting units, the position of the low power light-emitting unit with reference to the high power light-emitting unit, the ratio between the illumination power of the low power light-emitting unit to that of the high power light-emitting unit, and the distance between the low power light-emitting unit and light-diffusion apparatus may be properly configured so as to compensate for the poor illumination area of the high power light-emitting unit.

[0071] Preferably, the at least one high power light-emitting unit may be equally spaced or not equally spaced and the at least one low power light-emitting unit may be equally spaced or not equally spaced.

[0072] Preferably, the high power light-emitting unit and the low power light-emitting unit are white LEDs. Alternatively, the high power light-emitting unit is white LED and the low power light-emitting unit is red LED.

[0073] Preferably, the high power light-emitting unit and the low power light-emitting unit are configured on a rigid or flexible substrate.

[0074] In addition, during the fabrication of the illumination device and the implementation of the method for configuring the illumination device according to the present application, a three-dimensional structure such as curve, arc, sphere, spirality and the like may be formed based on the one-dimensional array or the two-dimensional array. The above forming may be a reconstruction to a structure (such as a flexible substrate) or a reconstruction to an array based on which the illumination device is manufactured.

[0075] Finally, it should be noted that the term "include", "comprise" or any other variations means a non-exclusive inclusion, so that the process, method, article or device that includes a series of elements includes not only these elements but also other elements that are not explicitly listed, or further includes inherent elements of the process, method, article or device. Moreover, when there is no further limitation, the element defined by the wording "include(s) a ..." does not exclude the case that in the process, method, article or device that includes the element there are other same elements.

[0076] The embodiments of the invention are described in detail in combination with drawings. However, it should be understood that the embodiments described above are only used for illustrating the invention, and do not constitute a limitation of the invention. Various modifications and variations may be made to the above embodiments by those skilled in the art, without departing from the essential and scope of the present invention. Therefore, the scope of the present invention is only defined by the appended claims and the equivalent meanings thereof.

Claims

CLAIMS What is claimed is:

1. An illumination device, comprising:

at least one first light-emitting unit; and

at least one second light-emitting unit with a lower illumination power than that of the first light-emitting unit;

wherein, the second light-emitting unit is arranged among the first light-emitting unit so that the illumination device is able to realize a uniform illumination.

2. The illumination device according to claim 1, wherein, the first light-emitting unit is arranged into a one-dimensional array.

3. The illumination device according to claim 2, wherein, at least one second light-emitting unit is arranged between every two first light-emitting units.

4. The illumination device according to claim 1 , wherein, the first light-emitting unit is arranged into a two-dimensional array.

5. The illumination device according to claim 4, wherein, the two-dimensional array comprises at least one array cell and at least one second light-emitting unit is arranged in each array cell.

6. The illumination device according to claim 4, wherein, the two-dimensional array comprises at least two lines and in each line, at least one second light-emitting unit is arranged between every two first light-emitting units.

7. The illumination device according to claim 4, wherein, the two-dimensional array comprises at least two lines of first light-emitting unit and at least one line of second light-emitting unit is arranged between every two lines of first light-emitting unit.

8. The illumination device according to any one of claims 1-7, wherein, the at least one first light-emitting unit is equally or not equally spaced and the at least one second light-emitting unit is equally or not equally spaced.

9. The illumination device according to any one of claims 1-7, wherein, the first light-emitting unit and the second light-emitting unit are white light emitting diode or the first light-emitting unit is white light emitting diode and the second light-emitting unit is red light emitting diode.

10. The illumination device according to any one of claims 1-7, wherein, the first light-emitting unit and the second light-emitting unit are configured on a rigid substrate or a flexible substrate.

1 1. The illumination device according to any one of claims 2-7, wherein, a three-dimensional structure is formed based on the one-dimensional array or the two-dimensional array.

12. The illumination device according to any one of claims 1-7, wherein, a power of the second light-emitting unit, an extraction angle of the second light-emitting unit, the number of the second light-emitting units, a position of the second light-emitting unit with reference to the first light-emitting unit, a ratio between the illumination power of the second light-emitting unit to that of the first light-emitting unit, and a distance between the second light-emitting unit and a light-diffusion apparatus are configured to compensate for an illumination area of the first light-emitting unit.

13. A method for configuring an illumination device, comprising:

arranging at least one second light-emitting unit, which has a lower illumination power than that of a first light-emitting unit, among at least one first light-emitting unit, so as to make the illumination device be able to realize a uniform illumination.

14. The method for configuring the illumination device according to claim 13, wherein, the first light-emitting unit is arranged into a one-dimensional array.

15. The method for configuring the illumination device according to claim 14, wherein, at least one second power light-emitting unit is arranged between every two first power light-emitting units.

16. The method for configuring the illumination device according to claim 13, wherein, the first light-emitting unit is arranged into a two-dimensional array.

17. The method for configuring the illumination device according to claim 16, wherein, the two-dimensional array comprises at least one array cell and at least one second light-emitting unit is arranged in the array cell.

18. The method for configuring the illumination device according to claim 16, wherein, the two-dimensional array comprises at least two lines, and in each line, at least one second light-emitting unit is arranged between every two first light-emitting units.

19. The method for configuring the illumination device according to claim 16, wherein, the two-dimensional array comprises at least two lines of first light-emitting unit and, at least one line of second light-emitting unit is arranged between every two lines of first light-emitting unit.

20. The method for configuring the illumination device according to claim 13, wherein, a power of the second light-emitting unit, an extraction angle of the second light-emitting unit, the number of the second light-emitting units, a position of the second light-emitting unit with reference to the first light-emitting unit, a ratio between the power of the second light-emitting unit to that of the first light-emitting unit, and a distance between the second light-emitting unit and a light-diffusion apparatus are configured to compensate for an illumination area of the first light-emitting unit.