Anti-blue-ray device, light-emitting device and display apparatus

Abstract

The present disclosure relates to the technical field of display. Provided are an anti-blue-ray device, a light-emitting device and a display apparatus. The anti-blue-ray device comprises: stacked at least one refractive index adjustment layer, the refractive index adjustment layer comprising a first film layer and a second film layer which are stacked, wherein the first film layer is arranged close to a light incident surface of the anti-blue-ray device, and the refractive index of the second film layer can be adjusted under the action of a driving signal. In a first mode, the absolute value of a difference value between the refractive index of the first film layer and the refractive index of the second film layer is smaller than or equal to a first threshold value; and in a second mode, the difference value between the refractive index of the second film layer and the refractive index of the first film layer is greater than or equal to a second threshold value, the second threshold value being greater than the first threshold value.

Description

Anti-blue light device, light-emitting device and display device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on June 30, 2023, with application number 202310798331.3 and invention name “A blue light protection device, a light-emitting device and a display device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of display technology, and in particular, to a blue light blocking device, a light-emitting device, and a display apparatus. Background Art

[0003] Organic light-emitting diodes (OLEDs) have the advantages of being fully solid-state, autonomously luminous, high brightness, high resolution, wide viewing angle, fast response speed, thin thickness, small size, light weight, the ability to use flexible substrates, low voltage DC drive, low power consumption, and a wide operating temperature range, making them widely used in the market.

[0004] Summary of the Invention

[0005] This disclosure adopts the following technical solutions:

[0006] A first aspect of an embodiment of the present application provides a blue light blocking device, comprising:

[0007] At least one refractive index adjustment layer is stacked, the refractive index adjustment layer comprising a first film layer and a second film layer, the first film layer is disposed near the light incident surface of the blue light blocking device, and the refractive index of the second film layer is adjustable under the action of a driving signal;

[0008] In the first mode, the absolute value of the difference between the refractive index of the first film layer and the refractive index of the second film layer is less than or equal to a first threshold; in the second mode, the absolute value of the difference between the refractive index of the second film layer and the refractive index of the first film layer is greater than or equal to a second threshold, and the second threshold is greater than the first threshold.

[0009] In an optional implementation, the first threshold is greater than or equal to 0 and less than or equal to 0.02; the second threshold is greater than or equal to 0.04 and less than or equal to 0.06.

[0010] In an optional embodiment, the refractive index of the first film layer is greater than or equal to a third threshold value and less than or equal to a fourth threshold value;

[0011] The refractive index of the second film layer is greater than or equal to the third threshold and less than or equal to a fifth threshold.

[0012] In an optional embodiment, the third threshold is greater than or equal to 1.45 and less than or equal to 1.55; the fourth threshold is greater than or equal to 1.65 and less than or equal to 1.75; and the fifth threshold is greater than or equal to 1.75 and less than or equal to 1.85.

[0013] In an optional embodiment, the number of the refractive index adjusting layers is greater than or equal to 3, and the sum of the thicknesses of at least one of the stacked refractive index adjusting layers is less than or equal to 20 μm.

[0014] In an optional embodiment, the driving signal is an electrical signal, and the second film layer includes a driving electrode and a liquid crystal layer. The driving electrode is used to form an electric field under the action of the electrical signal to drive the liquid crystal molecules in the liquid crystal layer to deflect so as to adjust the refractive index of the second film layer.

[0015] In an optional embodiment, the driving signal is an acoustic wave signal, and the second film layer includes an acousto-optic crystal, and the acousto-optic crystal is used to change its own refractive index under the action of the acoustic wave signal.

[0016] In an optional embodiment, the driving signal is an optical signal, and the second film layer includes a photonic crystal, and the photonic crystal is used to change its own refractive index under the action of the optical signal.

[0017] In an optional embodiment, the material of the first film layer includes at least one of the following: silicon nitride, silicon oxide, and silicon oxynitride.

[0018] In an optional embodiment, the thickness of the first film layer is the same as the thickness of the second film layer; the number of the refractive index adjusting layers is an even number greater than 3, and the thickness of the refractive index adjusting layer is greater than or equal to 130 nm and less than or equal to 140 nm.

[0019] A second aspect of the embodiments of the present application provides a light-emitting device, including:

[0020] at least one light emitting unit; and

[0021] The anti-blue light device as described in any one of the first aspects is located on the light-emitting side of the at least one light-emitting unit.

[0022] In an optional embodiment, the light emitting device includes a plurality of the light emitting units, and the plurality of light emitting units are stacked in a light emitting direction of the light emitting unit; and

[0023] The target parameter value of at least one of the light-emitting units is greater than or equal to a first critical value and less than or equal to a second critical value; the sum of the target parameter values ​​of all the light-emitting units is greater than or equal to a first total critical value and less than or equal to a second total critical value, the first total critical value is the product of the first critical value and the number of light-emitting units, the second total critical value is the product of the second critical value and the number of light-emitting units, and the target parameter value is at least one of the wavelength corresponding to the intrinsic spectrum peak, the intrinsic spectrum half-maximum width, and the intensity of the intrinsic spectrum target wavelength.

[0024] In an optional embodiment, when the target parameter value is the wavelength corresponding to the intrinsic spectrum peak, the first critical value is a first wavelength, the first wavelength is greater than or equal to 455 nm and less than or equal to 465 nm; the second critical value is a second wavelength, the second wavelength is greater than or equal to 465 nm and less than or equal to 475 nm.

[0025] In an optional embodiment, when the target parameter value is the intrinsic spectrum half-width, the first critical value is the first half-width, the first half-width is greater than or equal to 5nm and less than or equal to 15nm; the second critical value is the second half-width, the second half-width is greater than or equal to 25nm and less than or equal to 35nm.

[0026] In an optional embodiment, the target wavelength is 450 nm, and when the target parameter value is the intensity of the intrinsic spectrum target wavelength, the first critical value is a first intensity, the first intensity is greater than or equal to 0 and less than or equal to 0.1; the second critical value is a second intensity, the second intensity is greater than or equal to 0.25 and less than or equal to 0.4.

[0027] In an optional embodiment, the light emitting device further includes:

[0028] A first electrode and a second electrode, the at least one light-emitting unit is located between the first electrode and the second electrode, and the blue light protection device is arranged on a side of the second electrode away from the first electrode.

[0029] In an optional embodiment, the thickness of the second electrode is greater than or equal to 12 nm.

[0030] In an optional embodiment, the light emitting device further includes:

[0031] An optical coupling layer is provided between the second electrode and the blue light protection device.

[0032] In an optional embodiment, the product of the refractive index of the light coupling layer and the thickness of the light coupling layer is greater than or equal to 150.

[0033] A third aspect of an embodiment of the present application provides a display device, comprising a base substrate, and a plurality of light-emitting devices as described in any one of the second aspects, arranged on the base substrate.

[0034] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] FIG1 schematically shows a schematic structural diagram of a blue light protection device proposed in the present disclosure;

[0037] FIG2 schematically shows a schematic diagram of a blue light spectrum in a first mode proposed in the present disclosure;

[0038] FIG3 schematically shows a schematic diagram of a blue light spectrum in a second mode proposed in the present disclosure;

[0039] FIG4 schematically shows a reflection spectrum diagram of a refractive index adjustment layer in a second mode proposed in the present disclosure;

[0040] FIG5 schematically shows a schematic structural diagram of a light emitting device proposed in the present disclosure;

[0041] FIG6 schematically shows a schematic diagram of the structure of a light-emitting unit proposed in the present disclosure.

[0042] Explanation of the accompanying drawings: 100, first electrode; 200, second electrode; 300, light-emitting unit; 301, first carrier layer; 3011, hole injection layer; 3012, hole transport layer; 3013, electron blocking layer; 302, second carrier layer; 3021, hole blocking layer; 3022, electron transport layer; 3023, electron injection layer; 303, light-emitting layer; 400, connecting layer; 500, anti-blue light device; 501, refractive index adjustment layer; 501-1, first film layer; 501-2, second film layer; 600, optical coupling layer; 700, encapsulation layer. Specific embodiments

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0044] Display screens are continuously developing towards higher pixels, larger color gamuts, and lower power consumption. Flexible OLED (organic light-emitting diode) displays offer significant advantages over TFT-LCDs, such as foldability and bendability, making them a trend in display development and a favorite among electronics enthusiasts. Consequently, the industry is increasingly demanding higher efficiency and lifespans for OLED devices. While many high-efficiency, long-life OLED devices have been developed to meet practical needs, actual use still fails to fully meet the display performance currently sought by the industry. In addition to pursuing color saturation and brightness, the question of whether the light emitted by OLED devices could cause damage to the human eye is also a concern.

[0045] Prolonged exposure to blue light can lead to vision loss or even vision loss, with short-wavelength blue light between 400 and 460 nm being the most harmful to the human eye. In the display industry, blue light primarily originates from LCD displays using LEDs as backlight sources. Organic light-emitting diodes (OLEDs) are self-luminous, producing blue light primarily at 460 nm. While the amount of harmful blue light between 420 and 460 nm produced by OLEDs is lower than that produced by LCDs, some harmful blue light still exists in this wavelength range. Therefore, it is necessary to reduce the intensity of harmful blue light from OLEDs and improve the eye protection of OLED devices.

[0046] In view of this, an embodiment of the present disclosure proposes an anti-blue light device. Figure 1 schematically shows a schematic structural diagram of a blue light protection device proposed in the present disclosure. As shown in Figure 1, the anti-blue light device 500 includes at least one refractive index adjustment layer 501 arranged in a stacked manner, and the refractive index adjustment layer 501 includes a first film layer 501-1 and a second film layer 501-2 arranged in a stacked manner. The first film layer 501-1 is arranged close to the light incident surface of the anti-blue light device 500.

[0047] In the embodiment of the present disclosure, the refractive index of the second film layer 501-2 is adjustable under the action of a driving signal. Specifically, the driving signal includes a driving signal in a first mode and a driving signal in a second mode. The refractive index of the second film layer 501-2 is adjusted by the driving signal in the first mode, so that the refractive index of the first film layer 501-1 and the refractive index of the second film layer 501-2 are close to each other, so that harmful blue light (blue light with a wavelength between 420nm and 460nm) directly passes through the anti-blue light device 500 without reflection, thereby achieving the emission of normal light; the refractive index of the second film layer 501-2 is adjusted by the driving signal in the second mode, so that the second film layer 501-2 after the refractive index adjustment has a limiting effect on harmful blue light, reducing the proportion of blue light intensity with a wavelength between 420nm and 460nm in the emitted light to the total blue light spectrum intensity, thereby achieving an eye protection effect.

[0048] In the embodiment of the present disclosure, the first mode is a mode that does not restrict the outgoing light (for example, the first mode can be called the ordinary mode or the normal mode). At this time, the intensity of blue light with a wavelength between 420nm and 460nm in the outgoing light accounts for a relatively large proportion of the total blue light spectrum intensity. For example, in the first mode, the intensity of blue light with a wavelength between 420nm and 460nm in the outgoing light accounts for more than 30% of the total blue light spectrum intensity. Specifically, in the first mode, the refractive index of the first film layer 501-1 and the second film layer 501-2 are close. At this time, the refractive index adjustment layer 501 composed of the first film layer 501-1 and the second film layer 501-2 with similar refractive indices does not restrict the outgoing light. The light passes through the various hierarchical structures in the light-emitting device and the anti-blue light device 500 including the at least one refractive index adjustment layer 501 arranged in a stacked manner. The final outgoing light is emitted into the air, and the blue light intensity in the range of 420nm to 460nm in its blue light spectrum is relatively large.

[0049] In the embodiment of the present disclosure, the second mode is a mode in which, under the regulation of the driving signal, the emission of harmful blue light in the outgoing light is limited to achieve an eye protection effect (for example, the second mode can be called an eye protection mode or a blue light reduction mode). For example, in the second mode, the intensity of blue light with a wavelength between 420nm and 460nm in the outgoing light accounts for less than or equal to 30% of the total blue light spectrum intensity. The eye protection effect is a beneficial effect such as reducing the user's visual fatigue and reducing the damage to the human eye caused by light of a specific wavelength (such as short-wave blue light between 420nm and 460nm) (for example, the outgoing light of the light-emitting device is switched from a narrow viewing angle to a wide viewing angle to achieve an eye protection effect). Specifically, in the second mode, the refractive index of the second film layer 501-2 changes under the action of the driving signal, so that the changed second film layer 501-2 has a larger refractive index than the first film layer 501-1. At this time, the second film layer 501-2 in the refractive index adjustment layer 501 reflects harmful blue light (blue light with a wavelength between 420nm and 460nm) to a certain extent, so that the light passes through the various hierarchical structures in the light-emitting device and the anti-blue light device 500 including at least one stacked refractive index adjustment layer 501. The final output light is emitted into the air, and the proportion of blue light intensity in the range of 420nm to 460nm in its blue light spectrum to the total blue light spectrum intensity is reduced.

[0050] Specifically, in the first mode, the absolute value of the difference between the refractive index of the first film layer 501-1 and the refractive index of the second film layer 501-2 is less than or equal to a first threshold value, so that the refractive indices of the first film layer 501-1 and the second film layer 501-2 in the first mode are close; in the second mode, the difference between the refractive index of the second film layer 501-2 and the refractive index of the first film layer 501-1 is greater than or equal to a second threshold value, and the second threshold value is greater than the first threshold value, so that the second film layer 501-2 in the second mode has a larger refractive index than the first film layer 501-1.

[0051] In an optional embodiment, the first threshold is greater than or equal to 0 and less than or equal to 0.02; the second threshold is greater than or equal to 0.04 and less than or equal to 0.06. For example, the first threshold is 0.01 and the second threshold is 0.05. It should be noted that the above example is only a preferred case provided by the embodiment of the present disclosure. The values ​​of the first threshold and the second threshold involved in the embodiment of the present disclosure can be determined according to actual conditions, and the present disclosure does not limit them here.

[0052] In the first mode, the refractive index of the first film layer and the refractive index of the second film layer satisfy the following formula: |n2-n1|≤A1; 0≤A1≤0.02;

[0053] Wherein, n1 is the refractive index of the first film layer in the first mode; n2 is the refractive index of the second film layer in the first mode; and A1 is the first threshold.

[0054] In the second mode, the refractive index of the first film layer is the same as that of the first film layer in the first mode, and the refractive index of the second film layer is adjusted by the driving signal to be different from that of the second film layer in the first mode. In the second mode, the refractive index of the first film layer and the refractive index of the second film layer satisfy the following formula: |n′2-n′1|≥A2; 0.04≤A2≤0.06; n′1=n1, n′2>n2, A2>A1;

[0055] Among them, n′1 is the refractive index of the first film layer in the second mode; n′2 is the refractive index of the second film layer in the second mode; A2 is the second threshold; n1 is the refractive index of the first film layer in the first mode; n2 is the refractive index of the second film layer in the first mode; A1 is the first threshold.

[0056] In an embodiment of the present disclosure, Figure 2 schematically shows a schematic diagram of a blue light spectrum under a first mode proposed by the present disclosure. As shown in Figure 2, the shaded portion represents the blue light intensity in the range of 420nm to 460nm, and the curve represents the total blue light spectrum intensity. In the first mode, the absolute value of the difference between the refractive index of the first film layer and the refractive index of the second film layer is less than or equal to the first threshold value, so that the refractive index of the first film layer is very close to the refractive index of the second film layer. The second film layer does not reflect harmful blue light to a large extent in the first mode. The light passes through the various hierarchical structures in the light-emitting device and the anti-blue light device 500 including at least one stacked refractive index adjustment layer 501. The final output light is emitted into the air. The blue light intensity in the range of 420nm to 460nm in its blue light spectrum is relatively large, accounting for more than 30% of the total blue light spectrum intensity and less than or equal to 40% (as shown in Figure 2 The ratio of the shaded area to the total area enclosed by the spectrum).

[0057] FIG3 schematically illustrates a schematic diagram of a blue light spectrum under a second mode proposed by the present disclosure. As shown in FIG3 , in the second mode, the difference between the refractive index of the second film layer and the refractive index of the first film layer is greater than or equal to a second threshold value, so that the refractive index of the second film layer is greater than that of the first film layer. Due to its larger refractive index, the second film layer can reflect harmful blue light to a greater extent in the second mode. FIG4 schematically illustrates a schematic diagram of a reflective spectrum of a refractive index adjustment layer under a second mode proposed by the present disclosure. As shown in FIG4 , the refractive index adjustment layer (refractive index adjustable structure shown in FIG4 ) has the greatest reflection intensity for blue light in the range of 420 nm to 460 nm (as shown in FIG4 , the wavelength range symmetrical with a peak at 440 nm). The light passes through the various hierarchical structures in the light-emitting device and reaches the anti-blue light device including at least one stacked refractive index adjustment layer. After reflection from the second film layer in the second mode in the refractive index adjustment layer, the blue light in the range of 420nm to 460nm in the blue light spectrum is filtered out from the outgoing light, so that the proportion of blue light intensity in the range of 420nm to 460nm in the blue light spectrum of the outgoing light emitted into the air is reduced, and the proportion of the total blue light spectrum intensity is less than or equal to 30% (as shown in Figure 3, the ratio of the area under the curve in the range of 420nm to 460nm to the total area enclosed by the spectrum).

[0058] The disclosed embodiment adjusts the refractive index of the second film layer in the refractive index adjustment layer through a driving signal, so that the second film layer in the second mode can reflect blue light in the range of 420nm to 460nm in the blue light spectrum, thereby reducing the proportion of harmful blue light that originally accounted for more than 30% of the total blue light spectrum intensity to less than 30%. The intensity of harmful blue light in the outgoing light received by the user is reduced, thereby effectively protecting the user's eyes.

[0059] In an optional embodiment, in order to enable the first film layer 501-1 and the second film layer 501-2 to effectively transmit light while ensuring that the refractive index of the second film layer can be adjusted between the first mode and the second mode based on the driving signal, in the embodiment of the present disclosure, the refractive index of the first film layer is greater than or equal to the third threshold and less than or equal to the fourth threshold; the refractive index of the second film layer is greater than or equal to the third threshold and less than or equal to the fifth threshold.

[0060] In an optional embodiment, the third threshold is greater than or equal to 1.45 and less than or equal to 1.55; the fourth threshold is greater than or equal to 1.65 and less than or equal to 1.75; the fifth threshold is greater than or equal to 1.75 and less than or equal to 1.85. For example, the third threshold is equal to 1.5, the fourth threshold is equal to 1.7, and the fifth threshold is equal to 1.8. It should be noted that the above example is only a preferred case provided by the embodiment of the present disclosure. The values ​​of the third threshold, the fourth threshold and the fifth threshold involved in the embodiment of the present disclosure can be determined according to actual conditions, and the present disclosure does not limit them here.

[0061] In the embodiment of the present disclosure, the thickness of each of the refractive index adjustment layers in the anti-blue light device is determined according to the refractive index of the first film layer and the refractive index of the second film layer, wherein the thickness of each of the refractive index adjustment layers can be equivalent to the distance between the centers of the first film layer in two adjacent refractive index adjustment layers, or can be equivalent to the distance between the centers of the second film layer in two adjacent refractive index adjustment layers. Specifically, the reflected light whose wavelength satisfies the Bragg formula is reflected at the second film layer of the refractive index adjustment layer and cannot pass through the refractive index adjustment layer. Therefore, the thickness of each of the refractive index adjustment layers satisfies the Bragg formula shown below: 2n1Lsinθ=λ

[0062] Wherein, n1 is the refractive index of the first film layer in the first mode; L is the thickness of the refractive index adjustment layer; θ is the incident angle of the incident light; and λ is the wavelength of the light.

[0063] In an optional embodiment, in order to ensure that the refractive index adjustment layer 501 can effectively reflect blue light of a specific wavelength under the action of different driving signals, the anti-blue light device 500 needs to have at least one refractive index adjustment layer stacked, and the number of the refractive index adjustment layers is greater than or equal to 3, and the sum of the thicknesses of the at least one refractive index adjustment layer stacked is less than or equal to 20 μm. For example, if the thickness of the refractive index adjustment layer is determined to be 100 nm based on the Bragg formula and the refractive indices of the first film layer and the second film layer, then at least 3 refractive index adjustment layers with a thickness of 100 nm need to be provided in the anti-blue light device, and no more than 200 refractive index adjustment layers (the sum of the thicknesses of 200 refractive index adjustment layers with a thickness of 100 nm is 20 μm). It should be noted that the above example is only a specific embodiment proposed to enable those skilled in the art to better understand the scheme of the present disclosure. The actual number of refractive index adjustment layers can be determined according to actual conditions, and the present disclosure is not limited thereto.

[0064] In an optional embodiment, in each refractive index adjustment layer 501, the thickness of the first film layer 501-1 is the same as the thickness of the second film layer 501-2; the number of the refractive index adjustment layers 501 is an even number greater than 3, such as 4, 6, 8, etc., and the thickness of the refractive index adjustment layer 501 is greater than or equal to 130nm and less than or equal to 140nm.

[0065] In an embodiment of the present application, the material of the first film layer includes at least one of the following: silicon nitride, silicon oxide, and silicon oxynitride. The refractive index of the material of the first film layer does not change due to adjustment of the driving signal, so that the refractive index of the first film layer is the same in the first mode and the second mode. The second film layer includes a liquid crystal layer, which is used to refract and / or reflect light. The material of the liquid crystal layer is a material that can respond to the driving signal.

[0066] In an embodiment of the present application, the mode of the anti-blue light device is adjusted by a driving signal, specifically by adjusting the refractive index of the second film layer in each refractive index adjustment layer by the driving signal. In an optional embodiment, the driving signal is an electrical signal, and the second film layer includes a driving electrode for receiving the electrical signal and a liquid crystal layer, and the liquid crystal layer material is a nematic liquid crystal, such as an E7 nematic liquid crystal. Under the regulation of different driving signals, the liquid crystal molecules of the nematic liquid crystal undergo different degrees of deflection, thereby achieving a change in the refractive index of the second film layer (liquid crystal layer) based on the driving signal. Specifically, in the second mode, the driving electrode in the second film layer receives an electrical signal, and an electric field is formed under the action of the electrical signal. The electric field drives the liquid crystal molecules in the liquid crystal layer to deflect, so that the refractive index of the second film layer increases. Under the premise of satisfying the Bragg formula, the blue light in the range of 420nm to 460nm in the blue light spectrum is effectively reflected, so that the proportion of blue light intensity in the range of 420nm to 460nm in the blue light spectrum of the outgoing light entering the air decreases.

[0067] In an optional embodiment, FIG5 schematically illustrates a schematic diagram of the structure of a light-emitting device proposed in the present disclosure. As shown in FIG1 and FIG5, a driving electrode can be provided on each side of the second film layer 501-2, so that the second film layer 501-2 changes its refractive index under the action of the driving voltage difference between the two electrodes. Alternatively, a driving electrode can be provided on each side of the blue light blocking device 500, so that the blue light blocking device 500 changes its refractive index under the action of the driving voltage difference between the two electrodes.

[0068] In an optional embodiment, as shown in Figures 1 and 5, a driving electrode can be provided on the light-emitting side of the second film layer 501-2 (for example, provided on the side of the encapsulation layer 700 away from the first electrode 100), and the second electrode 200 (for example, a cathode) can be reused, so that the second film layer 501-2 changes its own refractive index under the action of the driving voltage difference between the driving electrode and the second electrode. Alternatively, a driving electrode can be provided on the light-emitting side of the blue light blocking device 500 (for example, provided on the side of the encapsulation layer 700 away from the first electrode 100), and the second electrode 200 (for example, a cathode) can be reused, so that the blue light blocking device 500 changes its own refractive index under the action of the driving voltage difference between the driving electrode and the second electrode.

[0069] In an optional embodiment, the driving signal can be an acoustic wave signal, and the material of the second film layer is an acousto-optic crystal. Specifically, in the second mode, the acousto-optic crystal in the second film layer receives the acoustic wave signal, and changes its own refractive index under the action of the acoustic wave signal, so that the refractive index of the second film layer becomes larger. Under the premise of satisfying the Bragg formula, it effectively reflects the blue light in the range of 420nm to 460nm in the blue light spectrum, so that the proportion of blue light intensity in the range of 420nm to 460nm in the blue light spectrum of the outgoing light emitted into the air decreases. It should be noted that the specific type of the acousto-optic crystal can be determined according to actual conditions, and the embodiments of the present disclosure are not limited here.

[0070] In an optional embodiment, the driving signal is an optical signal, and the material of the second film layer is a photonic crystal. Specifically, in the second mode, the photonic crystal in the second film layer receives the optical signal and changes its own refractive index under the action of the optical signal, so that the refractive index of the second film layer becomes larger. Under the premise of satisfying the Bragg formula, it effectively reflects the blue light in the range of 420nm to 460nm in the blue light spectrum, so that the proportion of blue light intensity in the range of 420nm to 460nm in the blue light spectrum of the outgoing light emitted into the air decreases. It should be noted that the specific type of the photonic crystal can be determined according to actual conditions, and the embodiments of the present disclosure are not limited here.

[0071] In an optional embodiment, when the driving signal is an acoustic wave signal or an optical signal, the reception and generation of the acoustic wave signal and the optical signal can be achieved in a manner similar to the method of setting the driving electrode provided in the embodiment of the present disclosure when the driving signal is an electrical signal, and will not be repeated here.

[0072] In order to enable those skilled in the art to understand the present disclosure more clearly, the anti-blue light device described in the present disclosure is now described in detail through the following embodiments.

[0073] In an optional embodiment, the anti-blue light device includes six refractive index adjustment layers stacked together. In the first mode, the refractive index of the first film layer of the refractive index adjustment layer is 1.64, and the refractive index of the second film layer is 1.65; in the second mode, the refractive index of the first film layer of the refractive index adjustment layer is 1.64, and the refractive index of the second film layer is 1.74. The incident angle of the incident light in the second mode is 90°. The thickness of each refractive index adjustment layer (equivalent to the distance between the centers of the first film layer in two adjacent refractive index adjustment layers or the distance between the centers of the second film layer in two adjacent refractive index adjustment layers) is calculated to be 134nm based on the Bragg formula. In the anti-blue light device, the thickness of the first film layer is the same as that of the second film layer, and the thickness of the anti-blue light device is 6×134=804μm. When the anti-blue light device is converted from the first mode to the second mode under the regulation of the driving signal, the second film layer can reflect effective blue light in the 420nm to 460nm band because it satisfies the Bragg formula, while blue light above 460nm is basically unaffected, thereby reducing the proportion of harmful blue light in the output light and improving the eye protection effect of the device.

[0074] The present application provides a blue light protection device, comprising: at least one refractive index adjustment layer stacked, the refractive index adjustment layer comprising a first film layer and a second film layer stacked, the first film layer being arranged close to the light incident surface of the blue light protection device, and the refractive index of the second film layer being adjustable under the action of a driving signal; in a first mode, the absolute value of the difference between the refractive index of the first film layer and the refractive index of the second film layer is less than or equal to a first threshold value; in a second mode, the difference between the refractive index of the second film layer and the refractive index of the first film layer is greater than or equal to a second threshold value, and the second threshold value is greater than the first threshold value. The present application provides a second film layer with an adjustable refractive index, and adjusts the refractive index of the second film layer through a driving signal, so that the second film layer in the second mode reflects the outgoing light within the harmful light wavelength range, thereby reducing the intensity of the outgoing light within the harmful light wavelength range and achieving an effective eye protection effect.

[0075] Based on the same inventive concept, an embodiment of the present application discloses a light-emitting device. Figure 5 schematically shows a schematic diagram of the structure of a light-emitting device proposed in the present disclosure. As shown in Figure 5, the light-emitting device includes: at least one light-emitting unit 300; and an anti-blue light device 500 as described in the embodiment of the present disclosure, and the anti-blue light device 500 is located on the light-emitting side of the at least one light-emitting unit 300.

[0076] If the optical parameters of the light-emitting unit are not restricted, harmful blue light will not be filtered out when the light passes through the light-emitting device, which will cause the proportion of harmful blue light of 420nm to 460nm in the light entering the refractive index adjustment layer to be too high. Even if it passes through the refractive index adjustment layer, it cannot be completely filtered. Therefore, it is necessary to pre-filter the harmful blue light in the light-emitting device to improve the eye protection effect of the refractive index adjustment layer. Specifically, in the embodiment of the present disclosure, the light-emitting device includes a plurality of light-emitting units 300, and the plurality of light-emitting units 300 are stacked in the light-emitting direction of the light-emitting unit 300; and the target parameter value of at least one of the light-emitting units 300 is greater than or equal to a first critical value and less than or equal to a second critical value; the sum of the target parameter values ​​of all the light-emitting units 300 is greater than or equal to a first total critical value and less than or equal to a second total critical value, the first total critical value is the product of the first critical value and the number of light-emitting units, and the second total critical value is the product of the second critical value and the number of light-emitting units, and the target parameter value is at least one of the wavelength corresponding to the peak of the intrinsic spectrum, the half-maximum width of the intrinsic spectrum, and the intensity of the target wavelength of the intrinsic spectrum.

[0077] Exemplarily, the light-emitting device includes three stacked first light-emitting units, a second light-emitting unit, and a third light-emitting unit, and the target parameter values ​​of the light-emitting units satisfy: the target parameter values ​​of any one, two or three of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit are greater than or equal to the first critical value and less than or equal to the second critical value, and the sum of the target parameter values ​​of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit is greater than or equal to the first total critical value and less than or equal to the second total critical value.

[0078] In an embodiment of the present application, by limiting the target parameters of multiple light-emitting units stacked in the light-emitting device, the target parameter value of at least one light-emitting unit in the light-emitting device is made to meet the range of the critical value, and at the same time, the target parameter values ​​of all light-emitting units are made to meet the range of the total critical value. Under the refraction effect of multiple light-emitting units that meet the above-mentioned critical value and total critical value ranges, after light containing a large amount of harmful blue light of 420nm to 460nm passes through multiple light-emitting units of the light-emitting device, the harmful blue light that accounts for greater than or equal to 40% of the light will be reduced to less than 40%. Therefore, when the light enters the anti-blue light device, the proportion of its harmful blue light has been reduced, thereby improving the eye protection effect of the anti-blue light device.

[0079] In the embodiment of the present disclosure, the target parameter value is at least one parameter value of the intrinsic spectrum of the light-emitting unit, and the target parameter value includes at least one of the wavelength corresponding to the intrinsic spectrum peak, the intrinsic spectrum half-width, and the intensity of the intrinsic spectrum target wavelength. For multiple light-emitting units in a light-emitting device, for at least one target parameter value, the target parameter value of at least one light-emitting unit in the light-emitting device is greater than or equal to a first critical value and less than or equal to a second critical value, and at the same time, the sum of the target parameter values ​​of all light-emitting units is greater than or equal to a first total critical value and less than or equal to a second total critical value.

[0080] Exemplarily, for a light-emitting device with three light-emitting units, when the target parameter value is the wavelength corresponding to the intrinsic spectrum peak, the wavelength corresponding to the intrinsic spectrum peak of at least one light-emitting unit (any one, any two or three light-emitting units) is greater than or equal to the first critical value of the wavelength, and less than or equal to the second critical value of the wavelength. At the same time, the sum of the wavelengths corresponding to the intrinsic spectrum peaks of all light-emitting units is greater than or equal to the first total critical value of the wavelength (three times the first critical value of the wavelength), and less than or equal to the second total critical value of the wavelength (three times the second critical value of the wavelength); for a light-emitting device with four light-emitting units, when the target parameter value is the intrinsic spectrum half-width, the intrinsic spectrum half-width of at least one light-emitting unit (any one, any two, any three or four light-emitting units) is greater than or equal to the first critical value of the half-width, and less than or equal to the second critical value of the half-width. At the same time, the sum of the intrinsic spectrum half-widths of all light-emitting units is greater than or equal to the first total critical value of the half-width (four times the first critical value of the half-width), and less than or equal to the second total critical value of the half-width (four times the second critical value of the half-width). It should be noted that the above examples are only two optional methods proposed to enable those skilled in the art to better understand the technical solutions of the present disclosure. The specific type of target parameters and the number of light-emitting units are determined according to actual conditions, and the present disclosure does not limit them.

[0081] In an optional embodiment, when the target parameter value is the wavelength corresponding to the intrinsic spectrum peak, the first critical value is a first wavelength, which is greater than or equal to 455nm and less than or equal to 465nm; the second critical value is a second wavelength, which is greater than or equal to 465nm and less than or equal to 475nm. Exemplarily, the first wavelength is equal to 460nm and the second wavelength is equal to 470nm. At this time, the light-emitting unit satisfies the following formula: 460≤λ n ≤470; 460×N≤(λ1+λ2+…+λ N )≤470×N;

[0082] Among them, λ nis the wavelength corresponding to the intrinsic spectrum peak of at least one light-emitting unit in the light-emitting device, n is at least one of 1 to N; N is the number of light-emitting units in the light-emitting device, λ1 is the wavelength corresponding to the intrinsic spectrum peak of the first light-emitting unit, λ2 is the wavelength corresponding to the intrinsic spectrum peak of the second light-emitting unit, λ N is the wavelength corresponding to the peak of the intrinsic spectrum of the Nth light-emitting unit.

[0083] It should be noted that the above example is only a preferred method proposed to enable those skilled in the art to better understand the technical solution of the present disclosure. The specific values ​​of the first wavelength and the second wavelength can be determined according to actual conditions, and the present disclosure does not limit them here.

[0084] In an optional embodiment, when the target parameter value is the intrinsic spectrum half-width, the first critical value is the first half-width, the first half-width is greater than or equal to 5nm and less than or equal to 15nm; the second critical value is the second half-width, the second half-width is greater than or equal to 25nm and less than or equal to 35nm. Exemplarily, the first half-width is equal to 10nm and the second half-width is equal to 30nm. At this time, the light-emitting unit satisfies the following formula: 10≤FWHM n ≤30; 10×N≤(FWHM1+FWHM2+…+FWHM N )≤30×N;

[0085] Among them, FWHM n is the intrinsic spectrum half-maximum width of at least one light-emitting unit in the light-emitting device, n is at least one of 1 to N; N is the number of light-emitting units in the light-emitting device, FWHM1 is the intrinsic spectrum half-maximum width of the first light-emitting unit, FWHM2 is the intrinsic spectrum half-maximum width of the second light-emitting unit, FWHM N is the intrinsic spectrum half-maximum width of the Nth light-emitting unit.

[0086] It should be noted that the above example is only a preferred method proposed to enable those skilled in the art to better understand the technical solution of the present disclosure. The specific values ​​of the first half-height width and the second half-height width can be determined according to actual conditions, and the present disclosure does not limit them here.

[0087] In an optional embodiment, the target wavelength is 450nm, and when the target parameter value is the intensity of the intrinsic spectrum target wavelength, the first critical value is a first intensity, the first intensity is greater than or equal to 0 and less than or equal to 0.1; the second critical value is a second intensity, the second intensity is greater than or equal to 0.25 and less than or equal to 0.4. Exemplarily, the target wavelength is 450nm, the first intensity is 0, and the second intensity is 0.35. At this time, the light-emitting unit satisfies the following formula: 0≤An ≤0.35; 0≤(A1+A2+…+A N )≤0.35×N;

[0088] Among them, A n is the intensity of the intrinsic spectrum target wavelength of at least one light-emitting unit in the light-emitting device, n is at least one of 1 to N; N is the number of light-emitting units in the light-emitting device, A1 is the intensity of the intrinsic spectrum target wavelength of the first light-emitting unit, A2 is the intensity of the intrinsic spectrum target wavelength of the second light-emitting unit, A N is the intensity of the target wavelength of the intrinsic spectrum of the Nth light-emitting unit.

[0089] It should be noted that the above example is only a preferred method proposed to enable those skilled in the art to better understand the technical solution of the present disclosure. The specific values ​​of the first strength and the second strength can be determined according to actual conditions, and the present disclosure does not limit them here.

[0090] The embodiment of the present disclosure filters harmful blue light in the light that needs to enter the anti-blue light device in advance by setting a combination of at least one light-emitting unit that meets the critical value conditions (including the critical value and the total critical value) in the light-emitting device, thereby reducing the proportion of harmful blue light in the light that needs to enter the anti-blue light device, so that the proportion of harmful blue light in the light that needs to be reflected by the anti-blue light device is within the range that the anti-blue light device can handle, thereby improving the eye protection effect of the light-emitting device.

[0091] In the embodiment of the present disclosure, as shown in Figure 5, the light-emitting device also includes: a first electrode 100 and a second electrode 200, the at least one light-emitting unit 300 is located between the first electrode 100 and the second electrode 200, and the anti-blue light device 500 is arranged on the side of the second electrode 200 away from the first electrode 100; an optical coupling layer 600, the optical coupling layer 600 is arranged between the second electrode 200 and the anti-blue light device 500; at least one connecting layer 400, each of the connecting layers 400 is arranged between two adjacent light-emitting units 300, and the connecting layer includes a stacked P-type doped layer and an N-type doped layer, the N-type doped layer is arranged close to the light-emitting surface of the light-emitting unit, and the P-type doped layer is arranged close to the light-incident surface of the light-emitting unit; an encapsulation layer 700, the encapsulation layer 700 is arranged on the side of the anti-blue light device 500 away from the first electrode 100.

[0092] It should also be noted that the intensity of the microcavity formed by the light-emitting device affects the width of the intrinsic spectrum. Specifically, since the microcavity formed by the light-emitting device narrows the intrinsic spectrum, the smaller the microcavity intensity, the narrower the intrinsic spectrum of the outgoing light; the narrower the intrinsic spectrum, the greater the proportion of harmful blue light. Therefore, in order to further reduce the proportion of harmful blue light in the light emitted from the self-luminous device, it is necessary to increase the microcavity intensity by increasing the thickness of the second electrode 200 and / or the optical coupling layer 600. In an optional embodiment, the thickness of the second electrode 200 is greater than or equal to 12nm. The product of the refractive index of the optical coupling layer 600 and the thickness of the optical coupling layer 600 is greater than or equal to 150.

[0093] In an optional embodiment, Figure 6 schematically shows a schematic diagram of the structure of a light-emitting unit proposed in the present disclosure. As shown in Figure 6, each of the light-emitting units 300 includes: a light-emitting layer 303, which is arranged between the first electrode 100 and the second electrode 200; a first carrier layer 301, which is arranged between the first electrode 100 and the light-emitting layer 303; and a second carrier layer 302, which is arranged between the second electrode 200 and the light-emitting layer 303.

[0094] In an optional embodiment, the first carrier layer includes at least one of a hole injection layer (HIL) 3011, a hole transport layer (HTL) 3012, and an electron block layer (EBL) 3013. The hole injection layer 3011, the hole transport layer 3012, and the electron block layer 3013 are stacked sequentially along a first direction between the first electrode 100 and the light-emitting layer 303. The first direction is the direction from the first electrode 100 to the second electrode 200. The electron block layer 3013 prevents the diffusion of electrons transmitted by the light-emitting layer 303, confining electrons and holes to the light-emitting layer. This lowers the injection barrier, reduces charge accumulation at the interface, slows interface degradation, and thus extends the life of the sub-pixel. It should be noted that the first carrier layer 301 may include only any one layer among the hole injection layer 3011, the hole transport layer 3012 and the electron blocking layer 3013, or may include any two layers among the hole injection layer 3011, the hole transport layer 3012 and the electron blocking layer 3013, or may include the hole injection layer 3011, the hole transport layer 3012 and the electron blocking layer 3013. The specific first carrier layer 301 can be set according to actual conditions, and the present disclosure does not impose any restrictions on this.

[0095] Preferably, as shown in Figure 6, the first carrier layer 301 includes a hole injection layer 3011, which is arranged on the side of the first electrode 100 close to the light-emitting layer 303; a hole transport layer 3012, which is arranged on the side of the hole injection layer 3011 away from the first electrode 100; and an electron blocking layer 3013, which is arranged on the side of the hole transport layer 3012 away from the first electrode 100.

[0096] In an optional embodiment, the second carrier layer 302 includes at least one of a hole blocking layer (HBL) 3021, an electron transport layer (ETL) 3022, and an electron injection layer (EIL) 3023. The hole blocking layer 3021, the electron transport layer 3022, and the electron injection layer 3023 are sequentially stacked along the first direction between the light-emitting layer 303 and the second electrode 200. The hole blocking layer 3021 can prevent the diffusion of holes transmitted by the light-emitting layer 303, confining the holes to the light-emitting layer, while lowering the injection barrier, reducing interface charge accumulation, and delaying interface degradation, thereby extending the life of the pixel. It should be noted that the second carrier layer 302 may include only any one layer among the hole blocking layer 3021, the electron transport layer 3022, and the electron injection layer 3023, or may include any two layers among the hole blocking layer 3021, the electron transport layer 3022, and the electron injection layer 3023, or may include the hole blocking layer 3021, the electron transport layer 3022, and the electron injection layer 3023. The specific second carrier layer 302 can be set according to actual conditions, and the present disclosure does not limit this.

[0097] Preferably, the second carrier layer 302 includes a hole blocking layer 3021, which is arranged on the side of the light-emitting layer 303 away from the first electrode 100; an electron transport layer 3022, which is arranged on the side of the hole blocking layer 3021 away from the first electrode 100; and an electron injection layer 3023, which is arranged on the side of the electron transport layer 3022 away from the first electrode 100.

[0098] In order to enable those skilled in the art to understand the present disclosure more clearly, the light-emitting device described in the present disclosure is now described in detail through the following embodiments.

[0099] The comparative example used for comparison is a light-emitting device comprising a single light-emitting unit. In this comparative example, the product of the refractive index of the light coupling layer and the thickness of the light coupling layer is less than 150, and the thickness of the second electrode is less than 12 nm. The wavelength corresponding to the peak of the intrinsic spectrum of the light-emitting unit in this comparative example light-emitting device is less than 460 nm, the intrinsic full width at half maximum is greater than 30 nm, and the intensity of the intrinsic spectrum at a wavelength of 450 nm is greater than 0.35 and less than 1. In the light emitted by this comparative example light-emitting device, the blue light intensity in the wavelength range of 420 nm to 460 nm accounts for greater than 40% and less than 100%.

[0100] Example 1

[0101] The light-emitting device provided in Example 1 includes a light-emitting unit. The product of the refractive index of the light-coupling layer and the thickness of the light-coupling layer in the light-emitting device provided in Example 1 is greater than or equal to 150, and the thickness of the second electrode is greater than or equal to 12 nm. The wavelength corresponding to the peak of the intrinsic spectrum of the light-emitting unit in the light-emitting device provided in Example 1 is greater than or equal to 460 nm and less than or equal to 470 nm. The intrinsic full width at half maximum is greater than or equal to 10 nm and less than or equal to 30 nm. The intensity of the intrinsic spectrum at a wavelength of 450 nm is greater than or equal to 0 and less than or equal to 0.35. In the light emitted by the light-emitting device of Example 1, in a first mode, the blue light intensity in the wavelength range of 420 nm to 460 nm accounts for greater than 30% and less than 40%. In a second mode, the blue light intensity in the wavelength range of 420 nm to 460 nm accounts for greater than 0% and less than 30%.

[0102] Example 2

[0103] The light-emitting device provided in Example 2 includes two light-emitting units. The product of the refractive index of the light coupling layer and the thickness of the light coupling layer in the light-emitting device provided in Example 2 is greater than or equal to 150, and the thickness of the second electrode is greater than or equal to 12 nm. The wavelengths corresponding to the intrinsic spectrum peaks of the two light-emitting units in the light-emitting device provided in Example 2 are both greater than or equal to 460 nm and less than or equal to 470 nm. The intrinsic half-maximum widths are both greater than or equal to 10 nm and less than or equal to 30 nm. The intensity at a wavelength of 450 nm of the intrinsic spectrum is not subject to any range restriction. The sum of the wavelengths corresponding to the intrinsic spectrum peaks of the two light-emitting units is greater than or equal to 920 nm and less than or equal to 940 nm. The sum of the intrinsic half-maximum widths of the two light-emitting units is greater than or equal to 20 nm and less than or equal to 60 nm. The sum of the intensities of the intrinsic spectra of the two light-emitting units at a wavelength of 450 nm is not subject to any range restriction. In the light emitted by the light-emitting device of this embodiment 2, in the first mode, the blue light intensity in the 420nm to 460nm band accounts for more than 30% and less than 40%; in the second mode, the blue light intensity in the 420nm to 460nm band accounts for more than 0% and less than or equal to 30%.

[0104] Example 3

[0105] The light-emitting device provided in Example 3 includes two light-emitting units (a first light-emitting unit and a second light-emitting unit). In the light-emitting device provided in Example 3, the product of the refractive index of the light coupling layer and the thickness of the light coupling layer is greater than or equal to 150, and the thickness of the second electrode is greater than or equal to 12 nm. The wavelength corresponding to the intrinsic spectrum peak of the first light-emitting unit in the light-emitting device provided in Example 3 is greater than or equal to 460 nm and less than or equal to 470 nm, and the wavelength corresponding to the intrinsic spectrum peak of the second light-emitting unit is different from that of the first light-emitting unit. The intrinsic half-width of the first light-emitting unit is greater than or equal to 10 nm and less than or equal to 30 nm, and the intrinsic half-width of the second light-emitting unit is different from that of the first light-emitting unit. The intensities of the intrinsic spectra of the first light-emitting unit and the second light-emitting unit at a wavelength of 450 nm are not subject to any range restrictions. The sum of the wavelengths corresponding to the intrinsic spectrum peaks of the two light-emitting units is greater than or equal to 920 nm and less than or equal to 940 nm. The sum of the intrinsic half-widths of the two light-emitting units is greater than or equal to 20 nm and less than or equal to 60 nm. The sum of the intensities of the intrinsic spectra of the two light-emitting units at a wavelength of 450 nm is not subject to any range restrictions. In the light emitted by the light-emitting device of this embodiment 3, in the first mode, the blue light intensity in the 420nm to 460nm band accounts for more than 30% and less than 40%; in the second mode, the blue light intensity in the 420nm to 460nm band accounts for more than 0% and less than or equal to 30%.

[0106] Example 4

[0107] The light-emitting device provided in Example 4 includes two light-emitting units (a first light-emitting unit and a second light-emitting unit). In the light-emitting device provided in Example 4, the product of the refractive index of the light coupling layer and the thickness of the light coupling layer is greater than or equal to 150, and the thickness of the second electrode is greater than or equal to 12 nm. The wavelength corresponding to the intrinsic spectrum peak of the first light-emitting unit in the light-emitting device provided in Example 4 is greater than or equal to 460 nm and less than or equal to 470 nm, and the wavelength corresponding to the intrinsic spectrum peak of the second light-emitting unit is not limited in range; the intrinsic half-width of the first light-emitting unit is greater than or equal to 10 nm. , and is less than or equal to 30nm, the intrinsic half-width of the second light-emitting unit has no range limit; the intensity of the intrinsic spectrum of the first light-emitting unit and the second light-emitting unit at a wavelength of 450nm is greater than or equal to 0, and both are less than or equal to 0.35; the sum of the wavelengths corresponding to the intrinsic spectrum peaks of the two light-emitting units is greater than or equal to 920nm, and less than or equal to 940nm; the sum of the intrinsic half-width of the two light-emitting units is greater than or equal to 20nm, and less than or equal to 60nm; the sum of the intensities of the intrinsic spectra of the two light-emitting units at a wavelength of 450nm is greater than or equal to 0, and less than or equal to 0.7. In the light emitted by the light-emitting device of this embodiment 4, in the first mode, the proportion of blue light intensity in the 420nm to 460nm band is greater than 30% and less than 40%; in the second mode, the proportion of blue light intensity in the 420nm to 460nm band is greater than 0%, and less than or equal to 30%.

[0108] Example 5

[0109] The light-emitting device provided in Example 5 includes two light-emitting units (a first light-emitting unit and a second light-emitting unit). In the light-emitting device provided in Example 5, the product of the refractive index of the light coupling layer and the thickness of the light coupling layer is greater than or equal to 150, and the thickness of the second electrode is greater than or equal to 12 nm. The wavelength corresponding to the intrinsic spectrum peak of the first light-emitting unit in the light-emitting device provided in Example 5 is greater than or equal to 460 nm and less than or equal to 470 nm, and the wavelength corresponding to the intrinsic spectrum peak of the second light-emitting unit is not limited in range. The intrinsic half-maximum width of the first light-emitting unit is greater than or equal to 10 nm and less than or equal to 30 nm. The intrinsic half-width of the second light-emitting unit has no range restriction; the intensity of the intrinsic spectrum of the first light-emitting unit at a wavelength of 450nm is greater than or equal to 0 and less than or equal to 0.35, and the intensity of the intrinsic spectrum of the second light-emitting unit at a wavelength of 450nm is different from that of the first light-emitting unit; the sum of the wavelengths corresponding to the intrinsic spectrum peaks of the two light-emitting units is greater than or equal to 920nm and less than or equal to 940nm; the sum of the intrinsic half-width of the two light-emitting units is greater than or equal to 20nm and less than or equal to 60nm; the sum of the intensities of the intrinsic spectra of the two light-emitting units at a wavelength of 450nm is greater than or equal to 0 and less than or equal to 0.7. In the light emitted by the light-emitting device of this embodiment 5, in the first mode, the blue light intensity in the 420nm to 460nm band accounts for greater than 30% and less than 40%; in the second mode, the blue light intensity in the 420nm to 460nm band accounts for greater than 0% and less than or equal to 30%.

[0110] Example 6

[0111] The light-emitting device provided in Example 6 includes three light-emitting units. The product of the refractive index of the light coupling layer and the thickness of the light coupling layer in the light-emitting device provided in Example 6 is greater than or equal to 150, and the thickness of the second electrode is greater than or equal to 12 nm. The wavelength corresponding to the intrinsic spectrum peak of any one of the three light-emitting units in the light-emitting device provided in Example 6 is greater than or equal to 460 nm and less than or equal to 470 nm, and the wavelengths corresponding to the intrinsic spectrum peaks of the other two light-emitting units are not limited in range. The intrinsic half-maximum width of any one of the three light-emitting units is greater than or equal to 10 nm and less than or equal to 30 nm, and the other two light-emitting units are greater than or equal to 10 nm. The intrinsic half-width of the light unit has no range restrictions; the intensity of the intrinsic spectrum of any one of the three light-emitting units at a wavelength of 450nm is greater than or equal to 0 and less than or equal to 0.35, and the intensity of the intrinsic spectra of the other two light-emitting units at a wavelength of 450nm has no range restrictions; the sum of the wavelengths corresponding to the intrinsic spectrum peaks of the three light-emitting units is greater than or equal to 1380nm and less than or equal to 1410nm; the sum of the intrinsic half-width of the three light-emitting units is greater than or equal to 30nm and less than or equal to 90nm; and the sum of the intensities of the intrinsic spectra of the three light-emitting units at a wavelength of 450nm is greater than or equal to 0 and less than or equal to 1.05. In the light emitted by the light-emitting device of Example 6, in the first mode, the blue light intensity in the 420nm to 460nm band accounts for greater than 30% and less than 40%; in the second mode, the blue light intensity in the 420nm to 460nm band accounts for greater than 0% and less than or equal to 30%.

[0112] Example 7

[0113] The light-emitting device provided in Example 7 includes N light-emitting units. The product of the refractive index of the light coupling layer and the thickness of the light coupling layer in the light-emitting device provided in Example 7 is greater than or equal to 150, and the thickness of the second electrode is greater than or equal to 12 nm. The wavelength corresponding to the intrinsic spectrum peak of any one of the N light-emitting units in the light-emitting device provided in Example 7 is greater than or equal to 460 nm and less than or equal to 470 nm, and the wavelength corresponding to the intrinsic spectrum peak of the other N-1 light-emitting units has no range restriction. The intrinsic half-maximum width of any one of the N light-emitting units is greater than or equal to 10 nm and less than or equal to 30 nm, and the other N-1 light-emitting units The intrinsic half-width of the N light-emitting units has no range restriction; the intensity of the intrinsic spectrum of any one of the N light-emitting units at a wavelength of 450nm is greater than or equal to 0 and less than or equal to 0.35, and the intensity of the intrinsic spectrum of the other N-1 light-emitting units at a wavelength of 450nm has no range restriction; the sum of the wavelengths corresponding to the intrinsic spectrum peaks of the N light-emitting units is greater than or equal to N×460nm and less than or equal to N×470nm; the sum of the intrinsic half-width of the N light-emitting units is greater than or equal to N×10nm and less than or equal to N×30nm; the sum of the intensities of the intrinsic spectra of the N light-emitting units at a wavelength of 450nm is greater than or equal to 0 and less than or equal to N×0.35. In the light emitted by the light-emitting device of this embodiment 7, in the first mode, the blue light intensity in the 420nm to 460nm band accounts for greater than 30% and less than 40%; in the second mode, the blue light intensity in the 420nm to 460nm band accounts for greater than 0% and less than or equal to 30%.

[0114] From the comparison of the eye protection effects of the above-mentioned embodiments 1 to 7 with the comparative example, it can be seen that the light-emitting device provided by the present disclosure meets the critical value range and the total critical value range as described above, and can reduce the proportion of harmful blue light in the first mode to 30% to 40%; when adjusted to the second mode, the light-emitting device is further adjusted by the anti-blue light device, and the proportion of harmful blue light in the emitted light is reduced to 0% to 30%, which effectively improves the eye protection effect of the light-emitting device.

[0115] Based on the same inventive concept, an embodiment of the present disclosure provides a display device, comprising a base substrate, and a plurality of light-emitting devices according to the embodiment of the present disclosure arranged on the base substrate.

[0116] In the embodiments of the present disclosure, the display device may be a display or a product including a display. The display may be a flat panel display (FPD), a microdisplay, or the like. Based on whether the user can see the back of the display, the display may be a transparent display or an opaque display. It should be noted that the specific display device may be determined based on actual circumstances and is not limited in this disclosure.

[0117] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one location or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiment. Persons of ordinary skill in the art will be able to understand and implement the present invention without inventive effort.

[0118] References herein to "one embodiment," "an embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present disclosure. Furthermore, please note that instances of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0119] In the description provided herein, numerous specific details are described. However, it is understood that embodiments of the present disclosure may be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description.

[0120] In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present disclosure may be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present disclosure.

Claims

1. A blue light protection device, characterized in that: include: At least one refractive index adjustment layer is stacked, the refractive index adjustment layer includes a first film layer and a second film layer which are stacked, the first film layer is arranged close to the light incident surface of the blue light protection device, and the refractive index of the second film layer can be adjusted under the action of a driving signal; In the first mode, the absolute value of the difference between the refractive index of the first film layer and the refractive index of the second film layer is less than or equal to a first threshold; in the second mode, the absolute value of the difference between the refractive index of the second film layer and the refractive index of the first film layer is greater than or equal to a second threshold, and the second threshold is greater than the first threshold.

2. The blue light protection device according to claim 1, characterized in that: The first threshold is greater than or equal to 0 and less than or equal to 0.02; the second threshold is greater than or equal to 0.04 and less than or equal to 0.

06.

3. The blue light protection device according to claim 1, characterized in that: The refractive index of the first film layer is greater than or equal to a third threshold value and less than or equal to a fourth threshold value; The refractive index of the second film layer is greater than or equal to the third threshold and less than or equal to a fifth threshold.

4. The blue light protection device according to claim 3, characterized in that: The third threshold is greater than or equal to 1.45 and less than or equal to 1.55; the fourth threshold is greater than or equal to 1.65 and less than or equal to 1.75; the fifth threshold is greater than or equal to 1.75 and less than or equal to 1.

85.

5. The blue light protection device according to claim 1, characterized in that: The number of the refractive index adjusting layers is greater than or equal to 3, and the sum of the thicknesses of at least one refractive index adjusting layer stacked in layers is less than or equal to 20 μm.

6. The blue light protection device according to claim 1, characterized in that: The driving signal is an electrical signal, and the second film layer includes a driving electrode and a liquid crystal layer. The driving electrode is used to form an electric field under the action of the electrical signal to drive the liquid crystal molecules in the liquid crystal layer to deflect so as to adjust the refractive index of the second film layer.

7. The blue light protection device according to claim 1, characterized in that: The driving signal is an acoustic wave signal, and the second film layer includes an acousto-optic crystal. The acousto-optic crystal is used to change its own refractive index under the action of the acoustic wave signal.

8. The blue light protection device according to claim 1, characterized in that: The driving signal is an optical signal, the second film layer includes a photonic crystal, and the photonic crystal is used to change its own refractive index under the action of the optical signal.

9. The blue light protection device according to claim 1, characterized in that: The material of the first film layer includes at least one of the following: silicon nitride, silicon oxide, and silicon oxynitride.

10. The blue light protection device according to claim 1, characterized in that: The thickness of the first film layer is the same as the thickness of the second film layer; the number of the refractive index adjusting layers is an even number greater than 3, and the thickness of the refractive index adjusting layer is greater than or equal to 130 nm and less than or equal to 140 nm.

11. A light emitting device, characterized in that: include: at least one light emitting unit; as well as The anti-blue light device as described in any one of claims 1 to 10, wherein the anti-blue light device is located on the light emitting side of the at least one light emitting unit.

12. The light emitting device according to claim 11, characterized in that: The light emitting device comprises a plurality of the light emitting units, and in the light emitting direction of the light emitting units, the plurality of the light emitting units are stacked; and The target parameter value of at least one of the light-emitting units is greater than or equal to the first critical value and less than or equal to the second critical value; the sum of the target parameter values ​​of all the light-emitting units is greater than or equal to the first total critical value and less than or equal to the second total critical value, the first total critical value is the product of the first critical value and the number of light-emitting units, the second total critical value is the product of the second critical value and the number of light-emitting units, and the target parameter values ​​are the wavelength corresponding to the peak value of the intrinsic spectrum, the half value of the intrinsic spectrum, and the wavelength corresponding to the peak value of the intrinsic spectrum. At least one of the height, width, and intensity of the intrinsic spectrum target wavelength.

13. The light emitting device according to claim 12, characterized in that: When the target parameter value is the wavelength corresponding to the intrinsic spectrum peak, the first critical value is a first wavelength, which is greater than or equal to 455 nm and less than or equal to 465 nm; the second critical value is a second wavelength, which is greater than or equal to 465 nm and less than or equal to 475 nm.

14. The light emitting device according to claim 12, characterized in that: When the target parameter value is the intrinsic spectrum half-width, the first critical value is the first half-width, the first half-width is greater than or equal to 5nm and less than or equal to 15nm; the second critical value is the second half-width, the second half-width is greater than or equal to 25nm and less than or equal to 35nm.

15. The light emitting device according to claim 12, characterized in that: The target wavelength is 450nm. When the target parameter value is the intensity of the intrinsic spectrum target wavelength, the first critical value is a first intensity, which is greater than or equal to 0 and less than or equal to 0.1; the second critical value is a second intensity, which is greater than or equal to 0.25 and less than or equal to 0.

4.

16. The light emitting device according to claim 11, characterized in that: The light emitting device further comprises: A first electrode and a second electrode, the at least one light-emitting unit is located between the first electrode and the second electrode, and the blue light protection device is arranged on a side of the second electrode away from the first electrode.

17. The light emitting device according to claim 16, characterized in that: The thickness of the second electrode is greater than or equal to 12 nm.

18. The light emitting device according to claim 16, characterized in that: The light emitting device further comprises: An optical coupling layer is arranged between the second electrode and the blue light protection device.

19. The light emitting device according to claim 18, characterized in that: The product of the refractive index of the light coupling layer and the thickness of the light coupling layer is greater than or equal to 150.

20. A display device, characterized in that: The display device comprises a base substrate, and a plurality of light emitting devices according to any one of claims 11 to 19 arranged on the base substrate.

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