A lighting device and its color temperature adjustment method

Abstract

This invention discloses a lighting device and its color temperature adjustment method. The method involves receiving a color temperature adjustment command, which instructs the user to raise or lower the color temperature of the lighting device. Based on the command, corresponding power signals are applied to multiple signal terminals to adjust the color temperature. By setting at least two rows of organic light-emitting devices (OLEDs) emitting different colors of light and connecting these rows to signal terminals via signal lines, the brightness of the corresponding OLED rows can be adjusted by regulating the power signals at the signal terminals. By adjusting the brightness ratio of different colors of light, the color temperature can be adjusted.

Description

Technical Field

[0001] This invention relates to the field of lighting, and more particularly to a lighting device and a method for adjusting the color temperature of the same. Background Technology

[0002] Organic light-emitting diodes (OLEDs) are widely used in electronics, commerce, transportation, and industrial control due to their characteristics such as low operating voltage, low power consumption, fast response, high luminous efficiency, and applicability to flexible substrates.

[0003] In OLED devices, electrons in the cathode and holes in the anode move towards the light-emitting layer under the drive of an applied voltage. These electrons and holes accumulate at the interface of the light-emitting layer and recombine to generate excitons, which activate the organic molecules in the light-emitting layer. The de-excitation of these excitons then results in light emission. When used for lighting, OLEDs are very thin, planar distributed light sources. Compared to the most widely used lighting device, the light-emitting diode (LED), they have unique advantages such as high efficiency, low energy consumption, long lifespan, no glare, and no heat dissipation.

[0004] However, current OLED lighting circuits correspond to a monochrome lighting structure with an unadjustable color temperature, making them unsuitable for diverse scenarios in daily life and work. Summary of the Invention

[0005] This invention provides a lighting device and a method for adjusting the color temperature of the same, for adjusting the color temperature of an OLED lighting device.

[0006] In a first aspect, the present invention provides a lighting device, comprising:

[0007] Multiple organic light-emitting devices are arranged in an array along a first direction and a second direction to form multiple organic light-emitting diode columns extending along the second direction, wherein the first direction and the second direction intersect; the emitted light of the same organic light-emitting device column is of the same color, and the emitted light of at least two organic light-emitting device columns is of different colors;

[0008] Multiple signal terminals are located on one side of all the organic light-emitting devices in the second direction; the signal terminals are used to provide power signals;

[0009] Multiple signal lines extend along the second direction and are arranged along the first direction; one of the signal lines connects to one of the organic light-emitting device arrays; one of the signal terminals connects to at least one of the signal lines.

[0010] In some embodiments of the present invention, it further includes:

[0011] A switching circuit is located between each of the signal lines and each of the signal terminals; the switching circuit includes a plurality of switching transistors, one switching transistor is connected to one of the signal lines, and one signal terminal is connected to at least one switching transistor; the switching transistor includes a control electrode, a first electrode, and a second electrode;

[0012] A switching signal line is provided, wherein the control electrode of each switching transistor is connected to the switching signal line, the first electrode of the switching transistor is connected to the corresponding signal line, and the second electrode of the switching transistor is connected to the corresponding signal terminal; the switching transistor is used to transmit the power signal provided by the signal terminal connected to the second electrode to the first electrode under the control of the switching signal transmitted on the switching signal line.

[0013] In some embodiments of the present invention, the organic light-emitting device array includes: at least one red organic light-emitting device array, at least one green organic light-emitting device array, and at least one blue organic light-emitting device array;

[0014] The red organic light-emitting device (OLED) column, the green OLED column, and the blue OLED column are arranged in a predetermined order along the first direction.

[0015] In some embodiments of the present invention, the signal terminal includes: a first signal terminal, a second signal terminal, and a third signal terminal;

[0016] Each of the red organic light-emitting devices is connected to the first signal terminal via a corresponding signal line; each of the green organic light-emitting devices is connected to the second signal terminal via a corresponding signal line; and each of the blue organic light-emitting devices is connected to the third signal terminal via a corresponding signal line.

[0017] In some embodiments of the present invention, the number of the red organic light-emitting device (OLED) column, the green OLED column, and the blue OLED column are all multiple; the signal terminals include: multiple first signal terminals, multiple second signal terminals, and multiple third signal terminals;

[0018] A first signal terminal is connected to a red organic light-emitting device (OLED) array via a signal line, a second signal terminal is connected to a green OLED array via a signal line, and a third signal terminal is connected to a blue OLED array via a signal line.

[0019] In some embodiments of the present invention, it further includes:

[0020] A driving board; the driving board includes a substrate and circuitry located on the substrate; the circuitry includes the plurality of signal lines and the plurality of signal terminals; the organic light-emitting device is located on the driving board and is electrically connected to the driving board;

[0021] The organic light-emitting device includes:

[0022] The anode is located on the driver board and is electrically connected to the corresponding signal line;

[0023] The light-emitting layer is located on the side of the anode facing away from the driving plate;

[0024] The cathode is located on the side of the light-emitting layer opposite to the anode; all the organic light-emitting devices share the same cathode;

[0025] Each organic light-emitting device in the red organic light-emitting device column is a red organic light-emitting device, each organic light-emitting device in the green organic light-emitting device column is a green organic light-emitting device, and each organic light-emitting device in the blue organic light-emitting device column is a blue organic light-emitting device;

[0026] The materials of the light-emitting layer of the red organic light-emitting device, the light-emitting layer of the green organic light-emitting device, and the light-emitting layer of the blue organic light-emitting device are all different;

[0027] Alternatively, each organic light-emitting device in the red organic light-emitting device column, the blue organic light-emitting device column, and the green organic light-emitting device column may be a white organic light-emitting device; and the material of the light-emitting layer of all the white organic light-emitting devices may be the same.

[0028] The lighting device also includes:

[0029] The color filter layer is located on the light-emitting side of the white organic light-emitting device;

[0030] The color filter layer includes: multiple red color filter units, multiple green color filter units, and multiple blue color filter units;

[0031] Each of the red color filter units, each of the green color filter units, and each of the blue color filter units corresponds one-to-one with each of the white organic light-emitting devices; within the same column of organic light-emitting devices, the color filter units corresponding to the white organic light-emitting devices have the same color.

[0032] Secondly, the present invention provides a color temperature adjustment method based on any of the above-mentioned lighting devices, comprising:

[0033] Receive a color temperature adjustment command; the color temperature adjustment command is used to indicate whether to increase or decrease the color temperature of the lighting device;

[0034] According to the color temperature adjustment command, a corresponding power signal is applied to the plurality of signal terminals to adjust the color temperature of the lighting device.

[0035] In some embodiments of the present invention, when the color temperature adjustment command is used to instruct an increase in the color temperature of the lighting device, applying a corresponding power signal to the plurality of signal terminals according to the color temperature adjustment command includes:

[0036] According to the color temperature adjustment command, a first power signal is applied to the plurality of signal terminals to increase the proportion of blue light in the light emitted by the lighting device and raise the color temperature of the lighting device.

[0037] When the color temperature adjustment command is used to instruct a reduction in the color temperature of the lighting device, applying a corresponding power signal to the plurality of signal terminals according to the color temperature adjustment command includes:

[0038] According to the color temperature adjustment command, a second power signal is applied to the plurality of signal terminals to increase the proportion of red light in the light emitted by the lighting device and reduce the color temperature of the lighting device.

[0039] In some embodiments of the present invention, the signal terminal includes: a first signal terminal, a second signal terminal, and a third signal terminal; each of the red organic light-emitting device columns is connected to the first signal terminal via a corresponding signal line; each of the green organic light-emitting device columns is connected to the second signal terminal via a corresponding signal line; and each of the blue organic light-emitting device columns is connected to the third signal terminal via a corresponding signal line.

[0040] Applying corresponding power signals to the plurality of signal terminals includes:

[0041] The power signals applied to the first signal terminal, the second signal terminal, and the third signal terminal are adjusted respectively to adjust the ratio of red light, green light, and blue light in the emitted light of the lighting device, thereby changing the color temperature of the lighting device.

[0042] In some embodiments of the present invention, the number of red organic light-emitting device (OLED) columns, green OLED columns, and blue OLED columns are all multiple; an adjacent red OLED column, a green OLED column, and a blue OLED column constitute an OLED group; the signal terminals include: multiple first signal terminals, multiple second signal terminals, and multiple third signal terminals; a first signal terminal is connected to a red OLED column via a signal line, a second signal terminal is connected to a green OLED column via a signal line, and a third signal terminal is connected to a blue OLED column via a signal line.

[0043] Applying corresponding power signals to the plurality of signal terminals includes:

[0044] The power signals applied to the first signal terminal, the second signal terminal, and the third signal terminal corresponding to each of the organic light-emitting device groups are adjusted respectively to adjust the ratio of red light, green light, and blue light in the emitted light of each organic light-emitting device group, thereby changing the color temperature of each organic light-emitting device group and thus changing the color temperature of the mixed light of each organic light-emitting device group.

[0045] The beneficial effects of this invention are as follows:

[0046] The present invention provides a lighting device and a color temperature adjustment method thereof. The lighting device includes: multiple organic light-emitting devices (OLEDs) arranged in an array along a first direction and a second direction to form multiple OLED columns extending along the second direction, the first direction and the second direction intersecting; the emitted light of the same OLED column is of the same color, and the emitted light of at least two OLED columns is of different colors; multiple signal terminals located on one side of all OLEDs in the second direction, used to provide power signals; multiple signal lines extending along the second direction and arranged along the first direction, one signal line connecting to one OLED column, and one signal terminal connecting to at least one signal line. A color temperature adjustment command is received, indicating whether to raise or lower the color temperature of the lighting device; according to the color temperature adjustment command, a corresponding power signal is applied to the multiple signal terminals to adjust the color temperature of the lighting device. By setting at least two OLED columns emitting different colors of light and connecting the OLED columns to the signal terminals via signal lines, the brightness of the corresponding OLED columns can be adjusted by adjusting the power signal on the signal terminals. By adjusting the brightness ratio of different colors of light, the effect of adjusting the color temperature is achieved. Attached Figure Description

[0047] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the structure of a lighting device in related technologies;

[0049] Figure 2 This is one of the structural schematic diagrams of the lighting device provided in the embodiments of the present invention;

[0050] Figure 3 A cross-sectional view of a lighting device provided in an embodiment of the present invention;

[0051] Figure 4 This is a second schematic diagram of the structure of the lighting device provided in an embodiment of the present invention;

[0052] Figure 5 This is the third schematic diagram of the structure of the lighting device provided in the embodiment of the present invention;

[0053] Figure 6 This is the fourth schematic diagram of the structure of the lighting device provided in the embodiment of the present invention;

[0054] Figure 7 Fifth schematic diagram of the structure of the lighting device provided in the embodiment of the present invention;

[0055] Figure 8 This is the sixth schematic diagram of the structure of the lighting device provided in the embodiment of the present invention;

[0056] Figure 9 A flowchart of a color temperature adjustment method for a lighting device provided in an embodiment of the present invention. Detailed Implementation

[0057] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, the exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the figures denote the same or similar structures, and therefore repeated descriptions of them will be omitted. Terms describing position and direction in the present invention are illustrative based on the accompanying drawings, but changes can be made as needed, and all such changes are included within the scope of protection of the present invention. The accompanying drawings of the present invention are for illustrative purposes only and do not represent actual proportions.

[0058] Currently, LEDs are the most widely used lighting devices due to their significant advantages such as high efficiency and energy saving, fast response speed, and long lifespan. In comparison, OLEDs also have unique advantages such as surface emission, no glare, and no heat dissipation during use, and are gradually being applied in the lighting field.

[0059] However, current OLED lighting devices are usually monochrome devices, which can only emit light of one color and cannot adjust the color temperature, making them unsuitable for diverse scenarios in work and life.

[0060] OLED devices typically include a cathode, an anode, and at least one organic light-emitting layer sandwiched between the two electrodes. When a voltage is applied to an OLED device, positive and negative charges recombine in the light-emitting layer, generating light. In related technologies, since OLED lighting devices all use monochromatic devices, if the color temperature of an OLED lighting device is to be adjusted, multiple OLED device layers need to be set up, and at least two of the multiple OLED device layers emit light of different colors. The color temperature is adjusted by regulating the luminous intensity of different OLED device layers.

[0061] Figure 1 This is a schematic diagram of the structure of a lighting device in related technologies.

[0062] like Figure 1 As shown, the lighting device in the related technology includes a first OLED device layer 10, a second OLED device layer 20, and a third OLED device layer 30, and may also include a reflective layer 40. The second OLED device layer 20, the first OLED device layer 10, and the reflective layer 40 are sequentially disposed on the third OLED device layer 30. Each OLED device layer contains at least one OLED device that emits light of the same color.

[0063] In an implementation that includes three OLED device layers, the OLED device layers typically emit red, green, and blue light respectively, and the desired color temperature of light is obtained by applying voltage to different OLED device layers.

[0064] It is evident that in related technologies, lighting devices typically use a single-layer OLED device lighting structure, which cannot adjust the color temperature. If the color temperature of the lighting device is to be adjusted, multiple layers of OLED devices are required, which is complex and costly.

[0065] In view of this, embodiments of the present invention provide a lighting device that can adjust the color temperature of the lighting device according to the switching of practical scenarios in order to achieve a high-quality lighting environment.

[0066] Figure 2 This is one of the structural schematic diagrams of a lighting device provided in an embodiment of the present invention.

[0067] like Figure 2 As shown, the lighting device provided in this embodiment of the invention includes: multiple organic light-emitting devices a1, multiple signal terminals a2, and multiple signal lines a3.

[0068] In this embodiment of the invention, the lighting device is an OLED lighting device, and the organic light-emitting device a1 can be an OLED device. An OLED device typically consists of an anode, a light-emitting layer, and a cathode. The anode can be made of a transparent conductive material such as indium tin oxide (ITO), the light-emitting layer can be made of an organic light-emitting material, and the cathode can be made of silver, magnesium, or metal oxides. The various layers of the OLED device can be fabricated using processes such as vapor deposition or solution deposition. No limitations are placed on the fabrication method or the materials used for each layer of the OLED device.

[0069] In this embodiment of the invention, the OLED device has a block structure, and each OLED device adopts a common cathode connection method, that is, each OLED device shares the same cathode. Therefore, by applying different signals to the anodes of different OLED devices, the driving current of the OLED device can be changed, thereby changing the luminous brightness of the OLED device.

[0070] like Figure 2 As shown, in this embodiment of the invention, multiple organic light-emitting devices a1 are arranged in an array along a first direction X1 and a second direction X2 to form multiple columns L of organic light-emitting devices extending along the second direction X2, wherein the first direction X1 and the second direction X2 intersect. In specific implementations, the first direction X1 can be a row direction and the second direction can be a column direction; or, the first direction X1 can be a column direction and the second direction can be a row direction; the first direction X1 and the second direction X2 can be perpendicular to each other.

[0071] In this embodiment of the invention, the emitted light from the same organic light-emitting device column L has the same color, while the emitted light from at least two organic light-emitting device columns L has different colors.

[0072] In some embodiments, the organic light-emitting device a1 may include organic light-emitting devices of multiple colors, such as red, green, blue, and white organic light-emitting devices. When applied to specific application scenarios, other colors of organic light-emitting devices may also be used as needed. The light-emitting layers of the organic light-emitting devices a1 that emit different colors of light use different organic light-emitting materials. The color range of each organic light-emitting device a1 is not limited here.

[0073] Arrange organic light-emitting devices (OLEDs) of the same color (a1) into multiple OLED columns, and then arrange the OLED columns of each color in a predetermined order to obtain... Figure 2 The array of organic light-emitting devices shown.

[0074] In other embodiments, all organic light-emitting devices a1 are white organic light-emitting devices, meaning that the organic light-emitting material used in the light-emitting layer of each organic light-emitting device a1 is the same. A color filter layer is then added to the light-emitting side of all organic light-emitting devices to enable each row of organic devices L to emit light of different colors. The lighting device contains at least two rows of organic light-emitting devices with different colors; that is, the color filter layer should contain at least two different colored color filter units, with each color filter unit corresponding one-to-one with the position of each white organic light-emitting device.

[0075] Figure 3 A cross-sectional view of a lighting device provided in an embodiment of the present invention.

[0076] Specifically, such as Figure 3 As shown, each organic light-emitting device a1 is a white organic light-emitting device. Each color filter unit contained in the color filter layer CM corresponds one-to-one with the organic light-emitting device a1. The white light emitted by each organic light-emitting device a1 is transformed into light of the corresponding color of each color filter unit after passing through the color filter layer CM.

[0077] like Figure 3 As shown, the color filter layer CM is typically formed on a transparent substrate T, while each organic light-emitting device (OLED) usually has an encapsulation layer F on its surface. The transparent substrate T, on which the color filter layer CM is formed, is bonded to each OLED, so that the positions of each color filter unit and each OLED correspond. Figure 3 As shown, the color filter layer CM may include multiple red color filter units CM1, multiple green color filter units CM2, and multiple blue color filter units CM3. In addition, color filter units of other colors may be provided as needed, and this is not limited here.

[0078] By setting color filter units of the same color into multiple color filter unit columns, and arranging color filter unit columns of different colors in a predetermined order, the following method is obtained: Figure 2 The array of organic light-emitting devices shown.

[0079] like Figure 3 As shown, the lighting device further includes a driver board N. The driver board N includes a substrate and circuitry located on the substrate. In this embodiment of the invention, each organic light-emitting device a1 is located on the driver board N and electrically connected to the driver board.

[0080] The driver board N can typically be rectangular or square. When the lighting device employs an irregular shape, the driver board N can also be irregularly shaped; no limitation is made here. Since the driver board N in this embodiment is applied to the lighting field rather than the display field, its manufacturing process is relatively simpler, which helps reduce manufacturing costs.

[0081] Specifically, a solid layer of conductive material is first formed on a substrate. This conductive material can be a metal such as copper, and there is no limitation on its application. Then, the conductive material layer is patterned using an etching method to obtain the desired circuit. Finally, an insulating material is applied to the circuit to form an insulating layer, and holes are drilled in the insulating layer at positions corresponding to each organic light-emitting device (a1). This allows the anode of the organic light-emitting device to be connected to the circuitry of the driver board within the anode layer of the organic light-emitting device.

[0082] like Figure 2 As shown, the lighting device provided in this embodiment of the invention includes multiple signal terminals a2 and multiple signal lines a3. The signal terminals a2 and signal lines are both circuits and can be fabricated simultaneously when forming the circuit.

[0083] like Figure 2 As shown, multiple signal terminals a2 are located on one side of all organic light-emitting devices a1 in the second direction X2, and are used to provide power signals; multiple signal lines a3 extend along the second direction X2 and are arranged along the first direction X1, one signal line a3 is connected to one organic light-emitting device column L, and one signal terminal a2 is connected to at least one signal line a3.

[0084] In this embodiment of the invention, the lighting device includes at least two rows L of organic light-emitting devices (OLEDs) emitting different colors of light. Each OLED row L is connected to a signal line a3, and each signal line a3 is ultimately connected to a different signal terminal a2. Therefore, by changing the power signal transmitted through the signal terminal a2, the driving current of the connected OLED rows can be changed, thereby altering the luminous brightness of the OLED rows. By changing the luminous brightness of the OLED rows emitting different colors of light, the brightness ratio of different colors of light in the lighting device can be changed, thus achieving the effect of adjusting the color temperature.

[0085] Figure 4 This is a second schematic diagram of the structure of the lighting device provided in an embodiment of the present invention.

[0086] like Figure 4 As shown, the lighting device provided in this embodiment of the invention further includes: a switch circuit E and a switch signal line SW. The switch circuit E is located between the signal line a3 and the signal terminal a2. The switch signal line SW is arranged adjacent to the switch circuit E, and the switch circuit E is connected to the switch signal line SW. The switch signal line SW provides a switch signal to the switch circuit E. In a specific implementation, the switch signal line SW can also be connected to a switch signal terminal, which can be arranged adjacent to each of the aforementioned signal terminals a2.

[0087] Specifically, the switching circuit E includes multiple switching transistors a4. In this embodiment of the invention, the switching transistors a4 can be thin-film transistors (TFTs), etc., and are not limited thereto. In this embodiment of the invention, the number of switching transistors a4 can be the same as the number of signal lines a3. Each switching transistor a4 is connected to one signal line a3, and one signal terminal a2 is connected to at least one switching transistor a4. The switching transistor a4 includes a control electrode, a first electrode, and a second electrode, wherein the control electrode is connected to the switching signal line SW, the first electrode is connected to the corresponding signal line a3, and the second electrode is connected to the corresponding signal terminal a2. The switching transistor a4 is used to transmit the power signal provided by the signal terminal connected to the second electrode to the first electrode under the control of the switching signal transmitted by the switching signal line SW.

[0088] Specifically, the switching transistor a4 can be a p-type transistor or an n-type transistor, and the switching signal transmitted by the switching signal line SW can be a level signal. When the switching transistor a4 is a p-type transistor, the switching signal is effective at a low level. When the switching signal is low, the switching transistor a4 is turned on, and the power signal from the second terminal can be transmitted to the first terminal. When the switching transistor a4 is an n-type transistor, the switching signal is effective at a high level. When the switching signal is high, the switching transistor a4 is turned on, and the power signal from the second terminal can be transmitted to the first terminal.

[0089] In this embodiment of the invention, the lighting device includes at least two rows L of organic light-emitting devices (OLEDs) emitting different colors of light. Each OLED row L is connected to a signal line a3, and each signal line a3 is connected to the first terminal of its corresponding switching transistor a4. The second terminal of the switching transistor a4 is connected to a different signal terminal a2, and the control terminal of the switching transistor a4 is connected to a switching signal line SW. Therefore, the switching transistor a4 can be turned on or off by controlling the level signal transmitted on the switching signal line SW. Thus, when each switching transistor a4 is turned on, the power signal provided by each signal terminal a2 is applied to the OLED row L through the corresponding signal line a3.

[0090] In practical implementation, the lighting device can be switched on and off by controlling the switching signal on the switch signal terminal. For example, when the switch signal provided on the switch signal terminal is a level signal that turns on all switching transistors a4, then all switching transistors a4 are turned on, and the power signal on each signal terminal a2 can be applied to the corresponding organic light-emitting device column L, thereby controlling the lighting device to emit light. When the switch signal provided on the switch signal terminal is a level signal that turns off all switching transistors a4, then all switching transistors a4 are turned off, and the power signal on each signal terminal a2 can no longer be applied to the corresponding organic light-emitting device column L, thereby controlling the lighting device to turn off. Therefore, after setting a switching circuit in the lighting device, the switching on and off of the lighting device can be controlled without changing the power signal on each signal terminal a2. Thus, once the color temperature of the lighting device has been set, it is no longer necessary to frequently change the power signal on each signal terminal a2; simply controlling the opening or closing of the switching circuit is sufficient to control the switching on and off of the lighting device.

[0091] In practical implementation, a switch button can be installed in the lighting device to trigger the switch signal provided on the on signal terminal. When the switch button is turned on, the switch circuit is controlled to be in a conducting state, and the lighting device is turned on; when the switch button is turned off, the switch circuit is controlled to be in a disengaged state, and the lighting device is turned off.

[0092] for Figure 4 The lighting device shown can change the driving current of the corresponding organic light-emitting device array L by changing the power signal transmitted through the signal terminal a2 when the switching circuit is on, thereby changing the luminous brightness of the organic light-emitting device array L. By changing the luminous brightness of the organic light-emitting device array that emits different colors of light, the brightness ratio of different colors of light in the lighting device can be changed, thereby achieving the effect of adjusting the color temperature.

[0093] Figure 5 This is the third schematic diagram of the structure of the lighting device provided in the embodiment of the present invention; Figure 6 The fourth schematic diagram of the lighting device provided in the embodiment of the present invention. Figure 5 and Figure 6 The difference in the lighting devices shown is that, Figure 6 A switching circuit E has been added to the lighting device shown.

[0094] like Figure 5 and Figure 6As shown, the organic light-emitting device (OLED) array L includes at least one red OLED array L1, at least one green OLED array L2, and at least one blue OLED array L3, with each OLED array L arranged in a predetermined order along the first direction X1. Red, blue, and green light can be combined in different proportions to create any color of light. Therefore, setting the OLED array L in the lighting device to red, green, and blue respectively can meet the ambient light color temperature requirements in most scenarios in production and daily life. This embodiment of the invention only uses the inclusion of red, green, and blue OLED arrays in the OLED array L as an example for specific illustration. In practical applications, other colors of OLED arrays may also be included. This embodiment of the invention does not limit the specific colors of the OLED arrays or the combinations of colors.

[0095] Accordingly, signal terminal a2 includes at least one first signal terminal VDD_1, at least one second signal terminal VDD_2, and at least one third signal terminal VDD_3.

[0096] In some embodiments, each organic light-emitting device (OLED) array is connected to only one signal terminal. Specifically, each red OLED array L1 is connected to a first signal terminal VDD_1, each green OLED array L2 is connected to a second signal terminal VDD_2, and each blue OLED array L3 is connected to a third signal terminal VDD_3. By changing the power signal transmitted through each signal terminal a2, the driving current of the corresponding OLED array can be changed, thereby changing the luminous brightness of each OLED array. By adjusting the brightness ratio of red, green, and blue light, the color temperature can be adjusted.

[0097] In practical implementation, the number of signal terminals and organic light-emitting device (OLED) arrays can be adjusted as needed. For example, in low-light environments, the number of OLED arrays and their corresponding signal terminals can be increased; in high-light environments, the number of OLED arrays and their corresponding signal terminals can be reduced, allowing the light emitted by the lighting device to adapt to the environment. Alternatively, the power signals on each signal terminal a2 can be controlled to illuminate all or part of the OLED arrays, thereby flexibly adjusting the brightness ratio of different colors of emitted light to meet the color temperature requirements of the emitted light in special lighting environments.

[0098] Figure 7 Fifth schematic diagram of the structure of the lighting device provided in the embodiment of the present invention; Figure 8 This is the sixth schematic diagram of the lighting device provided in the embodiment of the present invention.

[0099] In some embodiments, such as Figure 7 and Figure 8As shown, signal terminal a2 includes only one first signal terminal VDD_1, one second signal terminal VDD_2, and one third signal terminal VDD_3. All the multiple red organic light-emitting devices (OLEDs) in column L1 are connected to the same first signal terminal VDD_1, all the multiple green OLEDs in column L2 are connected to the same second signal terminal VDD_2, and all the multiple blue OLEDs in column L3 are connected to the same third signal terminal VDD_3.

[0100] Adjusting the power signal applied to the first signal terminal VDD_1 can simultaneously adjust the brightness of the red light emitted by all red organic light-emitting devices L1. Similarly, adjusting the power signals applied to the second signal terminal VDD_2 and the third signal terminal VDD_3 can respectively adjust the brightness of the green light emitted by all green organic light-emitting devices L2 and the brightness of the blue light emitted by all blue organic light-emitting devices L3. By changing the brightness ratio of red, green, and blue light, the color temperature of the light emitted by the lighting device can be adjusted.

[0101] In practice, the number of organic light-emitting diode (OLED) arrays can be adjusted as needed, but the number of signal terminals remains constant. Connecting OLED arrays of the same color to the same signal terminal reduces the number of signal terminals used in the lighting device. This reduces the production cost and manufacturing difficulty of the lighting device.

[0102] Based on the same inventive concept, embodiments of the present invention also provide a method for adjusting the color temperature of a lighting device, which can adjust the color temperature of the light emitted from any of the above-mentioned lighting devices.

[0103] Figure 9 A flowchart of a color temperature adjustment method for a lighting device provided in an embodiment of the present invention.

[0104] like Figure 9 As shown, the color temperature adjustment method provided in this embodiment of the invention includes:

[0105] S1, Receive color temperature adjustment command;

[0106] S2. Apply corresponding power signals to multiple signal terminals according to the color temperature adjustment command.

[0107] Specifically, the color temperature adjustment command in step S1 is used to indicate whether to raise or lower the color temperature of the lighting device. Low color temperature light is reddish and warm, giving a warm and comfortable feeling, and is often used in environments such as homes, shopping malls, and cafes; high color temperature light is bluish and cool, which can increase alertness, and is often used in environments such as factories, offices, and libraries. In the specific implementation of this method, it is first necessary to give instructions to raise or lower the color temperature according to different usage scenarios.

[0108] The color temperature of the lighting fixture can be adjusted using a matching control panel or remote control. Typically, the control panel or remote control has corresponding buttons to indicate whether the color temperature of the lighting fixture is increased or decreased. When the user presses the corresponding button, a corresponding color temperature adjustment command is sent to the lighting fixture.

[0109] Specifically, when the color temperature adjustment command received by the lighting device is used to instruct an increase in color temperature, a first power signal is applied to multiple signal terminals according to the color temperature adjustment command to increase the proportion of blue light in the light emitted by the lighting device, thereby increasing the color temperature of the lighting device.

[0110] When the color temperature adjustment command received by the lighting device is used to instruct a reduction in color temperature, a second power signal is applied to multiple signal terminals according to the color temperature adjustment command to increase the proportion of red light in the emitted light of the lighting device, thereby reducing the color temperature of the lighting device.

[0111] The levels of the first and second power signals can be the same or different. This is because color temperature is determined by the brightness ratio of different colors of light. Increasing the color temperature can increase the brightness of blue light and correspondingly decrease the brightness of red light; conversely, decreasing the color temperature can increase the brightness of red light and correspondingly decrease the brightness of blue light. Therefore, in specific implementations, the power signals on the signal terminals can be adjusted according to actual needs. This embodiment of the invention does not limit the specific values ​​of the power signals applied to each signal terminal.

[0112] In some embodiments, the lighting device may employ Figure 7 or Figure 8 In the structure shown, the signal terminals include a first signal terminal, a second signal terminal, and a third signal terminal. Each red organic light-emitting device (OLED) array is connected to the same first signal terminal via a corresponding signal line, each green OLED array is connected to the same second signal terminal via a corresponding signal line, and each blue OLED array is connected to the same third signal terminal via a corresponding signal line. Therefore, adjusting the power signals of the first, second, and third signal terminals respectively can change the brightness of the red, green, and blue light emitted by each OLED array, thereby adjusting the ratio of red, green, and blue light in the emitted light of the lighting device and changing the color temperature of the lighting device.

[0113] use Figure 7 or Figure 8 When using the lighting device shown, only a small number of signal terminals are needed to achieve the effect of color temperature adjustment. This reduces the requirements for manufacturing costs and processes. Furthermore, it simplifies the lighting device when there are a large number of organic light-emitting devices.

[0114] In other embodiments, the lighting device may employ Figure 5 or Figure 6 The structure shown includes at least one first signal terminal, at least one second signal terminal, and at least one third signal terminal. The number of signal terminals is the same as the number of rows of organic light-emitting devices. Figure 5 or Figure 6 Taking the structure shown as an example, the signal terminals include multiple first signal terminals, multiple second signal terminals, and multiple third signal terminals. A first signal terminal is connected to a red organic light-emitting device (OLED) array via a signal line, a second signal terminal is connected to a green OLED array via a signal line, and a third signal terminal is connected to a blue OLED array via a signal line.

[0115] In practical implementation, an adjacent array of red, green, and blue organic light-emitting devices (OLEDs) can be grouped into an OLED group, allowing for individual adjustment of each group. For the same OLED group, adjusting the power signals at the first, second, and third signal terminals changes the brightness of the red, green, and blue light emitted by the group, thereby adjusting its color temperature. By mixing the color temperatures of the various OLED groups, the color temperature of the lighting device can be adjusted.

[0116] use Figure 5 or Figure 6 The lighting device shown can achieve individual control of each signal terminal, so that each row of organic light-emitting devices can emit light of different brightness. It can also adjust the color temperature of each group of organic light-emitting devices individually, and can be applied to various scenarios such as adjusting only local color temperature.

[0117] It is worth noting that lighting devices all require aging tests after leaving the factory, and these tests require applying a large driving current to the lighting devices, placing significant stress on the circuitry. In this embodiment of the invention, by connecting the organic light-emitting devices (OLEDs) to different signal terminals, the aging tests can be performed in sections or groups, thus reducing the current applied to the circuitry and minimizing the stress on the circuitry.

[0118] Specifically, aging tests can be performed first on all rows of red organic light-emitting devices, then on all rows of green organic light-emitting devices, and then on all rows of blue organic light-emitting devices; alternatively, aging tests can be performed on each group of organic light-emitting devices sequentially. This invention does not limit the specific testing process; any lighting device structure provided in this invention can reduce the stress on the circuit during aging tests.

[0119] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0120] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A lighting device, characterized in that, include: Multiple organic light-emitting devices are arranged in an array along a first direction and a second direction to form multiple rows of organic light-emitting devices extending along the second direction, wherein the first direction and the second direction intersect. The emitted light from the same row of organic light-emitting devices has the same color, while the emitted light from at least two rows of organic light-emitting devices has different colors. The organic light-emitting device (OLED) array includes at least one red OLED array, at least one green OLED array, and at least one blue OLED array. The red, green, and blue OLED arrays are arranged in a predetermined order along the first direction. The OLEDs are OLED devices with a block structure. Each OLED device is connected using a common cathode. By applying different signals to the anodes of different OLED devices, the driving current of the OLED devices is changed, thereby altering their luminous intensity. By changing the luminous intensity of the OLED arrays emitting different colors of light, the brightness ratio of different colors of light in the lighting device is changed, thus achieving the effect of adjusting the color temperature. Multiple signal terminals are located on one side of all the organic light-emitting devices in the second direction; the signal terminals are used to provide power signals; Multiple signal lines extend along the second direction and are arranged along the first direction; one signal line connects to one of the organic light-emitting device (OLED) columns; one signal terminal connects to at least one signal line; multiple organic light-emitting devices in the same OLED column are connected in series to the signal terminal via the signal lines corresponding to the OLED column; one OLED column is connected to the signal terminal via one signal line. The device further includes: a switching circuit located between each of the signal lines and each of the signal terminals; the switching circuit includes multiple switching transistors, one switching transistor being connected to one signal line, and one signal terminal being connected to at least one switching transistor; each switching transistor includes a control electrode, a first electrode, and a second electrode; a switching signal line, wherein the control electrode of each switching transistor is connected to the switching signal line, the first electrode of each switching transistor is connected to the corresponding signal line, and the second electrode of each switching transistor is connected to the corresponding signal terminal; the switching transistor is used to transmit the power signal provided by the signal terminal connected to the second electrode to the first electrode under the control of the switching signal transmitted on the switching signal line; the same switching signal line connects the control electrodes of multiple switching transistors; by controlling the level signal transmitted on the switching signal line, the switching transistor is controlled to pass or turn off, thereby loading the power signal provided by each signal terminal onto the organic light-emitting device array through the corresponding signal line when each switching transistor is turned on, controlling the lighting device to emit light.

2. The lighting device as claimed in claim 1, characterized in that, The signal terminal includes: a first signal terminal, a second signal terminal, and a third signal terminal; Each of the red organic light-emitting devices is connected to the first signal terminal via a corresponding signal line; each of the green organic light-emitting devices is connected to the second signal terminal via a corresponding signal line; and each of the blue organic light-emitting devices is connected to the third signal terminal via a corresponding signal line.

3. The lighting device as described in claim 1, characterized in that, The number of red organic light-emitting device (OLED) columns, green OLED columns, and blue OLED columns are all multiple; the signal terminals include: multiple first signal terminals, multiple second signal terminals, and multiple third signal terminals; A first signal terminal is connected to a red organic light-emitting device (OLED) array via a signal line, a second signal terminal is connected to a green OLED array via a signal line, and a third signal terminal is connected to a blue OLED array via a signal line.

4. The lighting device as claimed in claim 1, characterized in that, Also includes: A driving board; the driving board includes a substrate and circuitry located on the substrate; The circuit includes the plurality of signal lines and the plurality of signal terminals; The organic light-emitting device is located on the driving board and is electrically connected to the driving board; The organic light-emitting device includes: The anode, located on the drive board, is electrically connected to the corresponding signal line; The light-emitting layer is located on the side of the anode facing away from the driving plate; The cathode is located on the side of the light-emitting layer opposite to the anode; all the organic light-emitting devices share the same cathode; Each organic light-emitting device in the red organic light-emitting device column is a red organic light-emitting device, each organic light-emitting device in the green organic light-emitting device column is a green organic light-emitting device, and each organic light-emitting device in the blue organic light-emitting device column is a blue organic light-emitting device; The materials of the light-emitting layer of the red organic light-emitting device, the light-emitting layer of the green organic light-emitting device, and the light-emitting layer of the blue organic light-emitting device are all different; Alternatively, each organic light-emitting device in the red organic light-emitting device column, the blue organic light-emitting device column, and the green organic light-emitting device column may be a white organic light-emitting device; and the material of the light-emitting layer of all the white organic light-emitting devices may be the same. The lighting device also includes: The color filter layer is located on the light-emitting side of the white organic light-emitting device; The color filter layer includes: multiple red color filter units, multiple green color filter units, and multiple blue color filter units; Each of the red color filter units, each of the green color filter units, and each of the blue color filter units corresponds one-to-one with each of the white organic light-emitting devices; within the same column of organic light-emitting devices, the color filter units corresponding to the white organic light-emitting devices have the same color.

5. A method for adjusting the color temperature of a lighting device according to any one of claims 1-4, characterized in that, include: Receive a color temperature adjustment command; the color temperature adjustment command is used to indicate whether to increase or decrease the color temperature of the lighting device; According to the color temperature adjustment command, a corresponding power signal is applied to the plurality of signal terminals to adjust the color temperature of the lighting device.

6. The color temperature adjustment method as described in claim 5, characterized in that, When the color temperature adjustment command is used to instruct an increase in the color temperature of the lighting device, applying a corresponding power signal to the plurality of signal terminals according to the color temperature adjustment command includes: According to the color temperature adjustment command, a first power signal is applied to the plurality of signal terminals to increase the proportion of blue light in the light emitted by the lighting device and raise the color temperature of the lighting device. When the color temperature adjustment command is used to instruct a reduction in the color temperature of the lighting device, applying a corresponding power signal to the plurality of signal terminals according to the color temperature adjustment command includes: According to the color temperature adjustment command, a second power signal is applied to the plurality of signal terminals to increase the proportion of red light in the light emitted by the lighting device and reduce the color temperature of the lighting device.

7. The color temperature adjustment method as described in claim 5 or 6, characterized in that, The signal terminals include: a first signal terminal, a second signal terminal, and a third signal terminal; each of the red organic light-emitting device columns is connected to the first signal terminal via a corresponding signal line; each of the green organic light-emitting device columns is connected to the second signal terminal via a corresponding signal line; and each of the blue organic light-emitting device columns is connected to the third signal terminal via a corresponding signal line. Applying corresponding power signals to the plurality of signal terminals includes: The power signals applied to the first signal terminal, the second signal terminal, and the third signal terminal are adjusted respectively to adjust the ratio of red light, green light, and blue light in the emitted light of the lighting device, thereby changing the color temperature of the lighting device.

8. The color temperature adjustment method as described in claim 5 or 6, characterized in that, The number of red, green, and blue organic light-emitting device (OLED) columns is multiple; adjacent red, green, and blue OLED columns constitute an OLED group; the signal terminals include multiple first signal terminals, multiple second signal terminals, and multiple third signal terminals; one first signal terminal is connected to one red OLED column via a signal line, one second signal terminal is connected to one green OLED column via a signal line, and one third signal terminal is connected to one blue OLED column via a signal line. Applying corresponding power signals to the plurality of signal terminals includes: The power signals applied to the first signal terminal, the second signal terminal, and the third signal terminal corresponding to each of the organic light-emitting device groups are adjusted respectively to adjust the ratio of red light, green light, and blue light in the emitted light of each organic light-emitting device group, thereby changing the color temperature of each organic light-emitting device group and thus changing the color temperature of the mixed light of each organic light-emitting device group.

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