JP2017220374A - Light emitting device and display device - Google Patents

Abstract

Provided is a technique capable of changing a light emission color of a light emitting device with a simple configuration while suppressing a decrease in light emission amount of the light emitting device. A light-emitting device of the present invention includes a plurality of light-emitting units including a first light-emitting unit and a second light-emitting unit, and a conversion unit that converts the color of light from each light-emitting unit. A first conversion region for converting the color of light from the first light emitting unit to a first color, and a color of light from the second light emitting unit to a second color different from the first color. A second conversion region. [Selection] Figure 1

Description

  The present invention relates to a light emitting device and a display device.

  The color (color temperature) of a display image that is an image displayed on the display device depends on the color (spectral spectrum) of light from the light emitting device. “Light from the light emitting device” means “light source of the light emitting device (light emitted from a light emitting diode (LED (Light Emitting Diode) etc.)”), “light emitted from the light source of the light emitting device, and light emitting device In the case where the display device is a liquid crystal display device, the color of the display image (display color) also depends on the transmittance of the liquid crystal panel. The display color can be changed by individually adjusting the transmittance of the plurality of liquid crystal elements respectively corresponding to the plurality of color filters.

  As a method of changing the color of light from the light emitting device (light emitting color), a method of using three types of LEDs, R-LED, G-LED, and B-LED, as a light source of the light emitting device has been proposed. The R-LED is an LED whose emission color is red, the G-LED is an LED whose emission color is green, and the B-LED is an LED whose emission color is blue. In this method, the light emission color of the light emitting device is changed by individually controlling the light emission amount of the R-LED (light emission luminance; light emission intensity), the light emission amount of the G-LED, and the light emission amount of the B-LED. Can do.

  For example, Patent Literature 1 discloses a technique related to changing the emission color of the light emitting device. In the technique disclosed in Patent Document 1, the color of light after passing through the phosphor sheet is changed by moving the phosphor sheets having different numbers of layers between the plurality of regions.

  In display devices, it is desired to widen the display color. For example, display in a color gamut wider than the color gamut of sRGB (color space IEC 61966-2-1 defined by IEC (International Electrotechnical Commission)) is desired. Specifically, display in a color gamut of AdobeRGB (color space defined by Adobe Systems) is desired.

  Therefore, in recent years, the use of quantum dot films for display devices has been studied. The quantum dot film has a structure in which a plurality of quantum dots are dispersed in the film. For example, when irradiated with blue light, the quantum dot emits light having a narrow-band spectral spectrum (spectral spectrum having a narrow wavelength width). The technique regarding the display apparatus which has a quantum dot film is disclosed by patent document 2, for example. In the technique disclosed in Patent Document 2, a quantum dot film that emits green light and red light by irradiation of light (blue light) from a B-LED is provided between the B-LED and the liquid crystal panel. Yes.

  However, the technique disclosed in Patent Document 1 requires a configuration for moving the phosphor sheet, which complicates the configuration of the light emitting device and increases the cost of the light emitting device. Moreover, the conventional light-emitting device which has a quantum dot film cannot change the luminescent color of a light-emitting device. Therefore, in a conventional display device having a quantum dot film, it is necessary to change the transmittance of the liquid crystal panel in order to change the display color, and the display luminance (the luminance of the display image) decreases due to the change in the transmittance. .

JP 2012-221863 A JP 2012-022028 A

  An object of the present invention is to provide a technique capable of changing a light emission color of a light emitting device with a simple configuration while suppressing a decrease in light emission amount of the light emitting device.

The first aspect of the present invention is:
A plurality of light emitting units including a first light emitting unit and a second light emitting unit;
A conversion unit that converts the color of light from each light emitting unit;
Have
The converter is
A first conversion region for converting the color of light from the first light emitting unit into a first color;
A second conversion region for converting the color of light from the second light emitting unit into a second color different from the first color;
A light-emitting device characterized by comprising:

The second aspect of the present invention is:
The light emitting device;
A display unit that displays an image by transmitting light from the light emitting device;
It is a display device characterized by having.

  According to the present invention, it is possible to change the light emission color of the light emitting device with a simple configuration while suppressing a decrease in the light emission amount of the light emitting device.

FIG. 3 is a diagram illustrating a configuration example of a light emitting device according to Example 1. FIG. 10 is a diagram illustrating a configuration example of a light emitting device according to Example 2; FIG. 10 is a diagram illustrating a configuration example of a display device according to the second embodiment. The figure which shows an example of the spectrum which concerns on Example 1. FIG.

<Example 1>
Embodiment 1 of the present invention will be described below. The light emitting device according to this embodiment can be used as a light emitting device of a display device having a display unit (display panel) that displays an image by transmitting light emitted from the light emitting device. For example, it can be used as a backlight unit of a liquid crystal display device whose display unit is a liquid crystal panel. The light emitting device according to this embodiment can also be used as a light emitting device of a MEMS shutter type display device that uses a MEMS (Micro Electro Mechanical System) shutter instead of a liquid crystal element. The light emitting device according to this embodiment can also be used as a light emitting device for an image display device such as an advertisement sign device or a sign display device. The light emitting device according to this embodiment can also be used as a lighting device such as a street lamp, indoor lighting, and microscope lighting.

  FIG. 1 is a diagram illustrating a configuration example of a light emitting device 100 according to the present embodiment. The light emitting device 100 is an edge light type light emitting device having LEDs 110 to 113, an LED power source 120, current sources 130 and 131, a quantum dot film 140, and a light guide plate 150.

  Each of the LEDs 110 to 113 is a light emitting element (light source) that emits blue light. Specifically, each of the LEDs 110 to 113 is a light emitting diode that emits blue light. A light emitting diode emitting blue light is called a “blue light emitting diode”. The LED 110 and the LED 112 are connected in series with each other, and by controlling the current from the current source 130, the light emission amount (light emission luminance; light emission intensity) of the LED 110 and the light emission amount of the LED 112 are controlled. Here, each of LED110 and LED112 is called a "1st light emission part." The LED 111 and the LED 113 are connected in series with each other, and the light emission amount of the LED 111 and the light emission amount of the LED 113 are controlled by controlling the current from the current source 131. Here, each of the LED 111 and the LED 113 is referred to as a “second light emitting unit”.

  The control of the light emission amount of the LED will be described. Increasing the amount of current supplied to the LED can increase the amount of light emitted from the LED, and reducing the amount of current supplied to the LED can reduce the amount of light emitted from the LED. Further, by increasing the current supply time to the LED, the light emission amount of the LED can be increased, and by reducing the current supply time to the LED, the light emission amount of the LED can be reduced. When reducing the supply time of the current to the LED, for example, the supply of the current to the LED is stopped for a time when the turn-off of the LED is not detected by the human eye.

  The LED power source 120 is a power source that supplies power to the LEDs 110 to 113. The LED power source 120 is, for example, a step-down DC-DC conversion power source that receives 24V power and outputs 7V power. Note that the configuration of the LED power source 120 is not particularly limited as long as each of the current source 130 and the current source 131 can pass a necessary current.

  The combination of the current source 130 and the current source 131 is a control unit that individually controls the light emission amount of each light emitting unit. In this embodiment, the combination of the current source 130 and the current source 131 individually controls the light emission amount of the first light emitting unit and the light emission amount of the second light emitting unit. Specifically, as described above, the current source 130 controls the light emission amount of the LED 110 and the light emission amount of the LED 112 by controlling the current (current amount, current supply time, etc.) from the current source 130. To do. The current source 130 has a control circuit (not shown), and the current from the current source 130 is controlled by the control circuit of the current source 130. The current source 131 controls the light emission amount of the LED 111 and the light emission amount of the LED 113 by controlling the current from the current source 131. The current source 131 has a control circuit (not shown), and the current from the current source 131 is controlled by the control circuit of the current source 131.

  Each of the current source 130 and the current source 131 has, for example, a current mirror circuit. The current from the current source 130 is kept constant by the current mirror circuit of the current source 130 (constant current control) unless it is intentionally controlled by the control circuit of the current source 130. Similarly, constant current control of the current from the current source 131 is performed by the current mirror circuit of the current source 131.

  Note that the control circuit of the current source 130 and the control circuit of the current source 131 may be separate circuits or not. A common circuit between the current source 130 and the current source 131 may be used as the control circuit for the current source 130 and the control circuit for the current source 131, respectively. Moreover, if the light emission amount of each light emission part can be controlled separately, the structure of a control part will not be specifically limited. Specifically, the configurations of the current source 130 and the current source 131 are not particularly limited as long as the current from the current source 130 and the current from the current source 131 can be individually controlled.

The quantum dot film 140 is irradiated with light from each light emitting unit. The quantum dot film 140 is a conversion unit that converts the color of light from each light emitting unit and outputs the light after the color is converted. The quantum dot film 140 has a configuration in which a plurality of quantum dots are dispersed in a film (sheet). The quantum dots emit light of a color different from the predetermined color when irradiated with light of a predetermined color. Specifically, the quantum dots emit light having a spectral spectrum different from the spectral spectrum of the predetermined color light when irradiated with the predetermined color light. More specifically, the quantum dot emits light having a wavelength different from the wavelength (peak wavelength) of the light of the predetermined color when irradiated with the light of the predetermined color. Therefore, the quantum dots can also be called “wavelength conversion members”. The emission color of the quantum dots depends on the size (particle size) of the quantum dots. The light from the quantum dot film 140 includes a part of light (transmitted light) from each light emitting unit and light from each quantum dot. Therefore, the emission color of the quantum dot film 140 is different from the emission color of each light emitting unit. The light emission amount (total light emission amount) of the plurality of quantum dots depends on the number of quantum dots. Therefore, the emission color of the quantum dot film 140 can be changed by changing the density of the quantum dots.

  As shown in FIG. 1, the quantum dot film 140 has four regions of region A1, region A2, region A3, and region A4. Each of the region A1 and the region A3 is a first conversion region that converts the color of light from the first light emitting unit into the first color. Each of the region A2 and the region A4 is a second conversion region that converts the color of light from the second light emitting unit into a second color different from the first color. Hereinafter, the region A1, the region A2, the region A3, and the region A4 will be described in detail.

  Regions A1 and A3 include quantum dots that emit green light in response to blue light irradiation. Light from the LED 110 is irradiated onto the area A1, and light including blue light (a part of the light from the LED 110) and green light (light from the quantum dots in the area A1) is emitted from the area A1. Then, the light from the LED 112 is irradiated onto the region A3, and light including blue light (a part of the light from the LED 112) and green light (light from the quantum dots in the region A3) is emitted from the region A3. . Therefore, in the present embodiment, the first color is a mixed color of blue and green.

  Regions A2 and A4 include quantum dots that emit red light in response to irradiation with blue light. Light from the LED 111 is applied to the region A2, and light including blue light (a part of the light from the LED 111) and red light (light from the quantum dots in the region A2) is emitted from the region A2. Then, the light from the LED 113 is irradiated onto the region A4, and light including blue light (a part of the light from the LED 113) and red light (light from the quantum dots in the region A4) is emitted from the region A4. . Therefore, in this embodiment, the second color is a mixed color of blue and red.

  In this embodiment, the emission color of the quantum dots is determined by the size of the quantum dots. For this reason, the size of the quantum dots in the first conversion region is different from the size of the quantum dots in the second conversion region. In addition, the determination method of the luminescent color of a quantum dot is not specifically limited. The size of the quantum dots in the first conversion region may be substantially equal to the size of the quantum dots in the second conversion region (“substantially equal” includes “completely equal”).

  In this embodiment, the quantum dots are dispersed so that light of a predetermined color (for example, white) is emitted from the light guide plate 150 when the light emission amount of each light emitting unit is controlled to a predetermined light emission amount. . Specifically, the quantum dots are arranged such that the density of the quantum dots in the first conversion region becomes the first density, and the density of the quantum dots in the second conversion region becomes a second density different from the first density. Is distributed. The density of quantum dots in the first conversion region may be substantially equal to the density of quantum dots in the second conversion region (“substantially equal” includes “completely equal”).

  4A and 4B show an example of a spectrum of light from the quantum dot film 140. FIG. FIG. 4A shows an example where the LEDs 110 and 112 are turned on and the LEDs 111 and 113 are turned off.

  FIG. 4A shows that when only the LED 110 and the LED 112 are turned on, light including blue light and green light is emitted from the quantum dot film 140. That is, it can be seen that the light of the first color is emitted from the quantum dot film 140 when only the LED 110 and the LED 112 are turned on.

  FIG. 4B shows that when only the LED 111 and the LED 113 are turned on, light including blue light and red light is emitted from the quantum dot film 140. That is, it turns out that the light of the said 2nd color is emitted from the quantum dot film 140 when only LED111 and LED113 are lighted.

  4A and 4B, when the LED 110, the LED 111, the LED 112, and the LED 113 are turned on, the light including the first color light and the second color light is emitted from the quantum dot film 140. You can see that it is emitted. By controlling the light emission amount of the first light emitting unit (the light emission amount of the LED 110 and the light emission amount of the LED 112), the light amount of the first color light can be controlled, and the light emission amount of the second light emitting unit (the light emission amount of the LED 111 and By controlling the light emission amount of the LED 113, the control of the second color light can be changed. The light emission color of the quantum dot film 140 can be controlled by individually controlling the light amount of the first color light and the light amount of the second color light, and consequently the light emission color of the light emitting device 100 is controlled. it can.

  Thus, in this example, quantum dot film 140 has the 1st conversion field and the 2nd conversion field corresponding to the 1st light-emitting part and the 2nd light-emitting part, respectively. Then, by individually controlling the light emission amount of the first light emitting unit and the light emission amount of the second light emitting unit, the light emission amount of the first conversion region (the amount of light of the first color) and the light emission of the second conversion region. The amount (the amount of light of the second color) is individually controlled. As a result, the emission color of the quantum dot film 140 is controlled, and consequently the emission color of the light emitting device 100 is controlled.

  The light guide plate 150 is a light guide unit that guides light from the quantum dot film 140 in a predetermined direction. The light guide plate 150 is also a diffusion unit that diffuses (scatters) light from the quantum dot film 140. The configuration of the light guide plate 150 is not particularly limited. In this embodiment, the light guide plate 150 is made of an acrylic resin. Further, in this embodiment, light that enters the light guide plate 150 from the quantum dot film 140 is guided to a predetermined surface of the light guide plate 150 with a sufficiently long optical path length (optical distance), and is output from the predetermined surface. The light guide plate 150 has such a configuration. With such a configuration, when the LED 110, the LED 111, the LED 112, and the LED 113 are turned on, the first color light and the second color light are sufficiently mixed inside the light guide plate 150. As a result, when the LED 110, the LED 111, the LED 112, and the LED 113 are turned on, the first color light and the second color light are sufficiently mixed as the light from the light guide plate 150 (light emitting device 100). Can be obtained.

  FIG. 4C shows an example of a spectral spectrum of light from the light guide plate 150 when the LED 110, LED 111, LED 112, and LED 113 are turned on. FIG. 4C shows that light including blue light, green light, and red light is emitted from the light guide plate 150 when the LED 110, LED 111, LED 112, and LED 113 are turned on.

  Note that the light from the quantum dot film 140 diffuses to some extent. Therefore, even if the light guide plate 150 is not used, the light from the first conversion region (first color light) and the light from the second conversion region (second color light) are mixed. Therefore, when light is emitted from the quantum dot film 140 in the predetermined direction, the light emitting device 100 does not have to include the light guide plate 150.

  An example of a method for changing the emission color of the light-emitting device 100 will be described with reference to FIGS. 4C and 4D show an example of a spectrum of light from the light guide plate 150 when the LED 110, the LED 111, the LED 112, and the LED 113 are turned on. 4C and 4D, the supply time of the current source 130 (current supply time) is equal to the supply time of the current source 131. FIG. 4C shows an example where the current amount of the current source 130 is equal to the current amount of the current source 131. That is, FIG. 4C illustrates an example in which the light emission amount of the first light emitting unit (LED 110 and LED 112) is equal to the light emission amount of the second light emitting unit (LED 111 and LED 113).

  When the current amount of the current source 130 is increased from the state of FIG. 4C, the light emission amount of the first light emitting unit (LED 110 and LED 112) increases, and the light emission amount of the first conversion region (region A1 and region A3) increases. As a result, the amount of the first color light (blue light and green light) included in the light from the light guide plate 150 increases, and the light emission color of the light emitting device 100 is changed. Specifically, the spectrum of light from the light guide plate 150 is changed from the spectrum of FIG. 4C to the spectrum of FIG. In this embodiment, the light emitting device 100 has a current amount of the current source 130 increased from the state shown in FIG. 4C and a case where the current amount of the current source 131 is reduced from the state shown in FIG. The emission color is brought close to cyan. Then, in the case where the current amount of the current source 130 is reduced from the state of FIG. 4C and the case where the current amount of the current source 131 is increased from the state of FIG. Can be close to magenta.

  As described above, according to the present embodiment, the plurality of light emitting units include the first light emitting unit and the second light emitting unit, and the first conversion region and the second light emitting unit corresponding to the first light emitting unit and the second light emitting unit, respectively. The conversion unit has a conversion area. Accordingly, the emission color of the light emitting device can be changed with a simple configuration while suppressing a decrease in the light emission amount of the light emitting device. Specifically, the light emission color of the light emitting device can be changed only by individually changing the light emission amount of each light emitting unit without using a configuration for changing the position of the conversion unit, a liquid crystal panel, or the like. Further, since the light emission amount (light emission amount of the light emitting device) does not decrease due to the change in the transmittance of the liquid crystal panel, the light emission color of the light emitting device can be changed while suppressing the decrease in the light emission amount of the light emitting device.

  The light emitting device is not limited to the edge light type light emitting device. The configuration of the light emitting device is not particularly limited as long as the light emitting device includes the first light emitting unit, the second light emitting unit, and the conversion unit having the first conversion region and the second conversion region. Further, the light emitting element is not limited to the LED. The configuration of the light-emitting element is not particularly limited as long as the light-emitting element emits light that can be controlled by the light-emitting element and can be converted by the conversion unit. For example, an organic EL element, a cold cathode tube (CCFL), or the like may be used as the light emitting element.

  Note that the emission color of the light emitting element is not limited to blue. The light emission color of the light emitting element is not particularly limited as long as the light emitting element emits light that can be converted by the conversion unit. For example, ultraviolet light may be emitted from the light emitting element. Moreover, although the example in which the light emission color of the first light emission unit is substantially equal to the light emission color of the second light emission unit has been described, the present invention is not limited to this (“substantially equal” includes “completely equal”). The light emission colors may be different among the plurality of light emitting elements.

In addition, although the example in which one light emitting element is used as each of the first light emitting unit and the second light emitting unit has been described, the present invention is not limited thereto. At least one of the first light emitting unit and the second light emitting unit may have a plurality of light emitting elements. Moreover, although the example using two 1st light emission parts and two 2nd light emission parts was demonstrated, it is not restricted to this. The number of the first light emitting units may be one or more than two. The number of the second light emitting units may be one or more than two. Similarly, the number of first conversion areas and the number of second conversion areas are not particularly limited. Moreover, although the 1st light emission part and the 1st conversion area respond | corresponded by 1 to 1, and the 2nd light emission part and the 2nd conversion area respond | corresponded by 1 to 1 were demonstrated, it is not restricted to this . A plurality of first light emitting units may be associated with one first conversion region, or one first light emitting unit may be associated with a plurality of first conversion regions. A plurality of second light emitting units may be associated with one second conversion region, or one second light emitting unit may be associated with a plurality of second conversion regions.

  In addition, although the example in which the plurality of light emitting units includes only the first light emitting unit and the second light emitting unit has been described, the plurality of light emitting units further include a light emitting unit different from the first light emitting unit and the second light emitting unit. Also good. Similarly, the conversion unit may further include a conversion area different from the first conversion area and the second conversion area. Moreover, a conversion part is not restricted to a quantum dot film. For example, in the conversion unit, a phosphor different from the quantum dots may be used. The conversion part may be a plate-like member having a certain thickness. The conversion unit may be a single member or a combination of a plurality of members. For example, the conversion unit may be a combination of a plurality of members respectively corresponding to a plurality of regions.

  Note that the emission color (first color) of the first conversion area is not particularly limited. Similarly, the emission color (second color) in the second conversion area is not particularly limited. The emission color, size, and density of the quantum dots in the first conversion region are not particularly limited. Similarly, the emission color, size, and density of the quantum dots in the second conversion region are not particularly limited.

  In addition, although the example in which the plurality of areas of the conversion unit are arranged in one direction has been described, the arrangement of the plurality of areas is not particularly limited. For example, a plurality of regions may be arranged in a matrix, or a plurality of regions may be arranged in a staggered pattern. The plurality of first conversion regions may be adjacent to each other, and the plurality of second conversion regions may be adjacent to each other. However, if the first conversion area and the second conversion area are adjacent to each other as in the present embodiment, it is possible to efficiently perform color mixing of the light from the first conversion area and the light from the second conversion area.

<Example 2>
Embodiment 2 of the present invention will be described below. In this embodiment, an example of a direct light emitting device will be described. Below, the description about the structure similar to Example 1 is abbreviate | omitted. FIG. 2 is a diagram illustrating a configuration example of the light emitting device 200 according to the present embodiment. The light emitting device 200 is a direct light emitting device using a light guide plate. The light emitting device 200 includes LEDs 210 to 213, LED power sources 220 and 221, current sources 230 to 233, a quantum dot film 240, and light guide plates 250 to 253.

  Each of the LEDs 210 to 213 is a blue light emitting diode. Each of the LED 210 and the LED 213 is a first light emitting unit, and each of the LED 211 and the LED 212 is a second light emitting unit. The LED power source 220 is a power source that supplies power to the LED 210 and the LED 211, and the LED power source 221 is a power source that supplies power to the LED 212 and the LED 213.

  The combination of the current source 230, the current source 231, the current source 232, and the current source 233 is a control unit that individually controls the light emission amount of each light emitting unit. Specifically, the current source 230 controls the light emission amount of the LED 210 by controlling the current from the current source 230, and the current source 231 controls the light emission of the LED 211 by controlling the current from the current source 231. Control the amount. The current source 232 controls the amount of light emitted from the LED 212 by controlling the current from the current source 232, and the current source 233 controls the amount of light emitted from the LED 213 by controlling the current from the current source 233. To do.

Light from the LED 210 is applied to the light guide plate 250. The light guide plate 250 guides light from the LED 210 to the quantum dot film 240 side. Light from the LED 211 is applied to the light guide plate 251. The light guide plate 251 guides the light from the LED 211 to the quantum dot film 240 side. Light from the LED 212 is applied to the light guide plate 252. The light guide plate 252 guides the light from the LED 212 to the quantum dot film 240 side. Light from the LED 213 is applied to the light guide plate 253. The light guide plate 253 guides the light from the LED 213 to the quantum dot film 240 side. In addition, when LED210-213 is arrange | positioned so that the light from LED210-213 may be irradiated to the quantum dot film 240, the light-emitting device 200 does not need to have the light-guide plates 250-253.

  The quantum dot film 240 is irradiated with light from each light emitting unit. The quantum dot film 240 converts the color of light from each light emitting unit, and outputs the light after the color is converted. Specifically, the quantum dot film 240 has a region B1, a region B2, a region B3, and a region B4. Each of the region B1 and the region B4 is a first conversion region, and each of the region B2 and the region B3 is a second conversion region. Light from the LED 210 is irradiated to the region B1 through the light guide plate 250, and light from the LED 211 is irradiated to the region B2 through the light guide plate 251. The light from the LED 212 is irradiated to the region B3 through the light guide plate 252, and the light from the LED 213 is irradiated to the region B4 through the light guide plate 253.

  FIG. 3 is a diagram illustrating a configuration example of a display device including the light emitting device 200. FIG. 3 is a cross-sectional view obtained by a plane perpendicular to the screen, the light emitting surface of the light emitting device, and the like. In the example of FIG. 3, the display device includes a liquid crystal panel 260 at a position where light from the quantum dot film 240 (light emitting device 200) is irradiated. The light from the light emitting device 200 is transmitted through the liquid crystal panel 260, whereby an image is displayed on the screen. The transmittance of the liquid crystal panel 260 is controlled based on image data and the like. The liquid crystal panel 260 is sufficiently separated from the quantum dot film 240. Therefore, when the LED 210, the LED 211, the LED 212, and the LED 213 are turned on, the liquid crystal panel 260 is irradiated with light in which the first color light and the second color light are sufficiently mixed.

  As described above, also in this embodiment, the plurality of light emitting units include the first light emitting unit and the second light emitting unit, and the first conversion region and the second conversion region respectively corresponding to the first light emitting unit and the second light emitting unit. Is included in the conversion unit. Accordingly, the emission color of the light emitting device can be changed with a simple configuration while suppressing a decrease in the light emission amount of the light emitting device.

  Note that the method for determining the emission color of the light emitting device is not particularly limited. For example, the display device may include a determination unit that automatically determines the emission color based on the image data, and the emission color of the light-emitting device may be controlled to the emission color determined by the determination unit. The light emission color may be designated by the user, and the light emission color of the light emitting device may be controlled to the designated light emission color.

100, 200: Light emitting device 110-113, 210-213: LED
140,240: Quantum dot film A1-A3, B1-B4: Area

Claims (10)

A plurality of light emitting units including a first light emitting unit and a second light emitting unit;
A conversion unit that converts the color of light from each light emitting unit;
Have
The converter is
A first conversion region for converting the color of light from the first light emitting unit into a first color;
A second conversion region for converting the color of light from the second light emitting unit into a second color different from the first color;
A light emitting device comprising: The light-emitting device according to claim 1, further comprising a diffusion unit that diffuses light from the conversion unit. The light emitting device according to claim 1, wherein the conversion unit includes quantum dots. The light emitting device according to claim 3, wherein the emission color of the quantum dots in the first conversion region is different from the emission color of the quantum dots in the second conversion region. 5. The light emitting device according to claim 3, wherein a size of the quantum dots in the first conversion region is different from a size of the quantum dots in the second conversion region. The light emitting device according to claim 3, wherein a density of quantum dots in the first conversion region is different from a density of quantum dots in the second conversion region. The light emitting device according to claim 1, wherein a light emission color of the first light emission unit is substantially equal to a light emission color of the second light emission unit. The light-emitting device according to claim 1, further comprising a control unit that individually controls a light emission amount of each light-emitting unit. A light emitting device according to any one of claims 1 to 8,
A display unit that displays an image by transmitting light from the light emitting device;
A display device comprising: The display device according to claim 9, further comprising a determining unit that determines a light emission color of the light emitting device based on image data.

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