Display substrate and its manufacturing method, display device

Abstract

This invention provides a display substrate, its manufacturing method, and a display device, belonging to the field of display technology. The display substrate includes: a substrate; a plurality of light-emitting devices, including blue light-emitting devices, located on the substrate; and a control layer located on the light-emitting side of the blue light-emitting devices. The peak wavelength of the transmission spectrum of the control layer is the same as the peak wavelength of the emission spectrum of the blue light-emitting devices. A first wavelength range of the transmission spectrum of the control layer includes the wavelength range corresponding to the emission spectrum of the blue light-emitting devices. The half-wavelength (WHM) of the control layer is more than twice that of the blue light-emitting devices. The first wavelength range is a portion of the wavelength range corresponding to the transmission spectrum of the control layer. This invention can improve the color gamut coverage of the display substrate.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a display substrate, its manufacturing method, and a display device. Background Technology

[0002] OLED (Organic Light-Emitting Diode) display devices have been listed as a promising next-generation display technology due to their advantages such as being thin, light, having a wide viewing angle, being actively emitting light, having continuously adjustable emission colors, having low cost, fast response speed, low energy consumption, low driving voltage, wide operating temperature range, simple manufacturing process, high luminous efficiency, and being flexible in display. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a display substrate and its manufacturing method, and a display device, which can improve the color gamut coverage of the display substrate.

[0004] To address the aforementioned technical problems, embodiments of the present invention provide the following technical solutions:

[0005] On one hand, a display substrate is provided, comprising:

[0006] Substrate;

[0007] A plurality of light-emitting devices located on the substrate, the light-emitting devices including blue light-emitting devices;

[0008] The modulation layer located on the light-emitting side of the blue light device has a peak wavelength of transmission spectrum that is the same as the peak wavelength of emission spectrum of the blue light device. The first wavelength range of transmission spectrum of the modulation layer includes the wavelength range corresponding to emission spectrum of the blue light device. The half-wavelength peak width of the modulation layer is more than twice that of the half-wavelength peak width of the blue light device. The first wavelength range is a portion of the wavelength range corresponding to transmission spectrum of the modulation layer.

[0009] In some embodiments, the first wavelength range is from the peak wavelength corresponding to 1% transmittance to the cutoff wavelength corresponding to 1% transmittance.

[0010] In some embodiments, the half-wavelength of the modulation layer is more than five times the half-wavelength of the blue light device.

[0011] In some embodiments, the peak wavelength of the transmission spectrum of the control layer is A, the peak wavelength of the emission spectrum of the blue light device is B, A is less than B, and the difference between A and B is not less than 60 nm.

[0012] In some embodiments, the cutoff wavelength of the transmission spectrum of the control layer is C, and the cutoff wavelength of the emission spectrum of the blue light device is D, where C is greater than D and the difference between C and D is no greater than 40 nm.

[0013] In some embodiments, the control layer employs at least one of the following: phthalocyanine organic pigments, diketopyrrolopyrrolo organic pigments, and pyrrolopyrrolodione organic pigments.

[0014] In some embodiments, the microcavity length of the blue light device is greater than 260 nm.

[0015] Embodiments of the present invention also provide a display device, including a display substrate as described above.

[0016] Embodiments of the present invention also provide a method for manufacturing a display substrate, comprising:

[0017] Provide a substrate;

[0018] A plurality of light-emitting devices are formed on the substrate, including blue light-emitting devices;

[0019] A modulation layer is formed on the light-emitting side of the blue light device. The peak wavelength of the transmission spectrum of the modulation layer is the same as the peak wavelength of the emission spectrum of the blue light device. The first wavelength range of the transmission spectrum of the modulation layer includes the wavelength range corresponding to the emission spectrum of the blue light device. The half-wavelength peak width of the modulation layer is more than twice that of the half-wavelength peak width of the blue light device. The first wavelength range is a portion of the wavelength range corresponding to the transmission spectrum of the modulation layer.

[0020] In some embodiments, forming the control layer includes:

[0021] The control layer is formed on the light-emitting side of the blue light device by vapor deposition using at least one of the following materials: phthalocyanine organic pigments, diketopyrrolopyrrolo organic pigments, and pyrrolopyrrolodione organic pigments.

[0022] In some embodiments, at least one of the following materials is dispersed in gelatin, acrylic resin or polyvinyl alcohol resin to obtain a mixture material: phthalocyanine organic pigment, diketopyrrole organic pigment, pyrrole diketopyrrole organic pigment;

[0023] The control layer is obtained by coating the mixture material or inkjet printing the mixture material on the light-emitting side of the blue light device.

[0024] The embodiments of the present invention have the following beneficial effects:

[0025] In the above scheme, by setting a modulation layer on the light-emitting side of the blue light device, the emission spectrum of the blue light emitted by the blue light device can be modulated. This can reduce the blue light color coordinate Bx while avoiding a significant increase in the blue light color coordinate By, thereby ensuring the color gamut coverage of the emission spectrum of the display substrate. Attached Figure Description

[0026] Figure 1 This is a cross-sectional schematic diagram of the display substrate according to an embodiment of the present invention;

[0027] Figure 2 This is a planar schematic diagram of the display substrate according to an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the emission spectrum of the control layer and the light-emitting device in an embodiment of the present invention;

[0029] Figure 4 and Figure 5 This is a schematic diagram of the color gamut coverage of the display substrate according to an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the transmission spectrum of the control layer in an embodiment of the present invention under different viewing angles;

[0031] Figure 7 This is a schematic diagram illustrating the brightness decay of blue light from the display substrate at different viewing angles according to an embodiment of the present invention;

[0032] Figure 8 This is a schematic diagram of the white light viewing angle deviation trajectory of the display substrate according to an embodiment of the present invention;

[0033] Figure 9 This is a schematic diagram illustrating the brightness decay of white light from a display substrate at different viewing angles, according to an embodiment of the present invention.

[0034] Figure Labels

[0035] 01 Substrate

[0036] 02 Blue light devices

[0037] 03 Encapsulation layer

[0038] 04 Regulation Layer Detailed Implementation

[0039] To make the technical problems, technical solutions and advantages of the embodiments of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0040] Active matrix organic light emitting devices (AMOLEDs) offer advantages such as low power consumption, high contrast, and vivid colors. As users demand higher image quality from integrated AMOLED displays in gaming, multimedia laptops, and desktop computers, the BT2020 color gamut standard (a color space standard established by the International Telecommunication Union) was proposed. The BT2020 color gamut standard corresponds to the following color coordinates: red (R) coordinates (Rx = 0.708, Ry = 0.292), green (G) coordinates (Gx = 0.17, Gy = 0.797), and blue (B) coordinates (Bx = 0.131, By = 0.046).

[0041] In related technologies, by selecting and optimizing the structure of deep red and deep green luminescent materials, a color gamut coverage of 97% has been achieved for BT2020 (CIE1976). However, the blue light Bx of current display products is usually only 0.14, which is greater than the 0.131 required by BT2020, resulting in a loss of color gamut coverage.

[0042] To reduce the Bx of blue light, the structure of blue light devices can be adjusted, such as increasing the microcavity length of the blue light device to reduce Bx; however, when related technologies adjust the structure of blue light devices, although Bx can be reduced, By will increase significantly, and the color gamut coverage cannot be effectively improved.

[0043] This invention provides a display substrate, a method for manufacturing the same, and a display device, which can improve the color gamut coverage of the display substrate.

[0044] Embodiments of the present invention provide a display substrate, such as... Figure 1 and Figure 2 As shown, it includes:

[0045] Substrate 01;

[0046] A plurality of light-emitting devices are located on the substrate 01, the light-emitting devices including a blue light-emitting device 02;

[0047] The modulation layer 04 located on the light-emitting side of the blue light device 02 has a transmission spectrum with the same peak wavelength as the emission spectrum of the blue light device 02. The first wavelength range of the transmission spectrum of the modulation layer 04 includes the wavelength range corresponding to the emission spectrum of the blue light device 02. The half-wavelength peak width of the modulation layer 04 is more than twice that of the half-wavelength peak width of the blue light device 02. The first wavelength range is a portion of the wavelength range corresponding to the transmission spectrum of the modulation layer 04.

[0048] In this embodiment, the display substrate may further include an encapsulation layer 03 located on the light-emitting side of the blue light device 02, and the control layer 04 may be located on the side of the encapsulation layer 03 away from the substrate 01.

[0049] In this embodiment, by setting a modulation layer on the light-emitting side of the blue light device, the emission spectrum of the blue light emitted by the blue light device can be modulated. This can reduce the blue light color coordinate Bx while avoiding a significant increase in the blue light color coordinate By, thereby ensuring the color gamut coverage of the emission spectrum of the display substrate.

[0050] In this embodiment, the peak wavelength of the transmission spectrum is the wavelength corresponding to the maximum transmittance, the peak wavelength of the emission spectrum is the wavelength corresponding to the maximum emission intensity, and the half-wavelength is the distance from the maximum amplitude of the wave to half its amplitude. The first wavelength range can be from the peak wavelength corresponding to 1% transmittance to the cutoff wavelength corresponding to 1% transmittance. By designing the parameters of the control layer 04, this embodiment can improve the matching degree between the blue light emitted by the display substrate and the requirements of CIE and BT2020.

[0051] In this embodiment, the control layer 04 can be at least one of the following: phthalocyanine organic pigments, diketopyrrolopyrrolo organic pigments, and pyrrolopyrrolodione organic pigments. In some embodiments, the control layer 04 can be copper phthalocyanine, which has strong absorption of light in the 560nm-610nm wavelength range. It can absorb the long wavelength range of the photoluminescence spectrum (PL spectrum) of green light-emitting materials and the short wavelength range of the PL spectrum of red light-emitting materials. Combined with other materials that absorb long wavelengths, it can achieve transmission of only the blue light band.

[0052] In this embodiment, the control layer 04 can be formed by vapor deposition, or by dispersing at least one of the following materials in gelatin, acrylic resin or polyvinyl alcohol resin to obtain a mixture of materials: phthalocyanine organic pigments, diketopyrrole organic pigments, pyrrole diketopyrrole organic pigments, and then forming the control layer 04 on the light-emitting side of the blue light device by coating with an exposure or inkjet printing film.

[0053] In this embodiment, the structure of the blue light device can be adjusted to increase the microcavity length of the blue light device, making the microcavity length of the blue light device greater than 260nm. By adjusting the structure and setting a control layer, the color gamut coverage of the display substrate can be effectively improved.

[0054] Figure 3The electroluminescence spectrum of the blue light-emitting device is shown, as well as the electroluminescence spectrum after structural adjustment of the blue light-emitting device, the transmission spectrum of the modulation layer, and the electroluminescence spectrum of the blue light-emitting device after structural adjustment (increasing the microcavity length) and setting the modulation layer on the light-emitting side of the blue light-emitting device. It can be seen that after only structural adjustment of the blue light-emitting device, the overall electroluminescence spectrum redshifts. Although Bx can be reduced, By increases more, i.e., ΔBx(0.005) < ΔBy(0.009). Therefore, simply adjusting the structure of the blue light-emitting device cannot improve the color gamut coverage of BT2020. To reduce By, this embodiment adds a modulation layer to the light-emitting side of the blue light device, and designs the parameters of the modulation layer: the peak wavelength of the transmission spectrum of the modulation layer is designed to be the same as the peak wavelength of the emission spectrum of the blue light device, the first wavelength range of the transmission spectrum of the modulation layer includes the wavelength range corresponding to the emission spectrum of the blue light device, the half-wavelength (WWHM) of the modulation layer is more than 5 times that of the blue light device; and the cutoff wavelength of the transmission spectrum of the modulation layer is C, the cutoff wavelength of the emission spectrum of the blue light device is D, C is greater than D, and the difference between C and D is not greater than 40 nm, so that the transmission spectrum can suppress the luminescence intensity of the long-wavelength band of the electroluminescence spectrum, thereby suppressing the increase of ΔBy after the increase of the microcavity length of the blue light device. Table 1 shows the color coordinates of different blue light devices, the electroluminescence spectrum of blue light devices, the electroluminescence spectrum after structural adjustment of blue light devices, the transmission spectrum of the modulation layer, and the parameters of the electroluminescence spectrum of blue light devices after structural adjustment and setting of a modulation layer on the light-emitting side of the blue light device. As can be seen from Table 1, after structural adjustment of the blue light device and setting a control layer on the light-emitting side of the blue light device, it is possible to make △Bx(0.004)>△By(0.003), thereby improving the BT2020 color gamut coverage.

[0055] Table 1

[0056]

[0057] Figure 4 The diagram illustrates the color gamut coverage corresponding to CIE1931. It can be seen that using blue light devices without structural adjustments results in a color gamut coverage of 95.5% for the display substrate; using blue light devices with structural adjustments (increasing the microcavity length) results in a color gamut coverage of 95.3%, a decrease rather than an increase; however, by adjusting the structure of the blue light devices (increasing the microcavity length) and adding a control layer on the light-emitting side of the blue light devices, the BT2020 color gamut coverage of the display substrate reaches 95.9%, close to 96%, which can greatly improve the color gamut coverage of the display substrate.

[0058] Figure 5The diagram illustrates the color gamut coverage corresponding to CIE1976. It shows that using blue light-emitting devices without structural adjustments results in a color gamut coverage of 97.2% for the display substrate; using blue light-emitting devices with structural adjustments (increasing the microcavity length) results in a color gamut coverage of 95.8%, a decrease rather than an increase; however, by adjusting the structure of the blue light-emitting devices (increasing the microcavity length) and adding a control layer on the light-emitting side of the blue light-emitting devices, the BT2020 color gamut coverage of the display substrate reaches 98.2%, exceeding 98%, which significantly improves the color gamut coverage of the display substrate.

[0059] Table 2 shows the color coordinates and color gamut coverage of the BT2020 standard, the color coordinates and color gamut coverage of high color gamut products, the color coordinates and color gamut coverage of blue light devices in high color gamut products after structural adjustment (increased microcavity length), and the color coordinates and color gamut coverage of blue light devices in high color gamut products after structural adjustment (increased microcavity length) and the addition of a control layer on the light-emitting side.

[0060] Table 2

[0061]

[0062] It can be seen that, after structural adjustments and the setting of the control layer, the blue light device achieved a BT2020 color gamut coverage of nearly 96%@ CIE1931 and a color gamut coverage of over 98%@ CIE1976, which greatly increased the color gamut coverage of the display substrate.

[0063] In some embodiments, the peak wavelength of the transmission spectrum of the control layer is A, and the peak wavelength of the emission spectrum of the blue light device is B. A is less than B, and the difference between A and B is not less than 60 nm. This can minimize the impact on the brightness decay of the blue light viewing angle.

[0064] Figure 6 This is a schematic diagram of the transmission spectrum of the control layer under different viewing angles in an embodiment of the present invention. It shows the transmission spectrum of the control layer under 0°, 30°, 45° and 60° viewing angles. It can be seen that as the viewing angle increases, the optical path of the light emitted by the blue light device in the control layer increases and the transmittance decreases. Moreover, the larger the viewing angle, the greater the decrease in transmittance at the same wavelength, which is manifested as a narrowing of the transmission spectrum.

[0065] Figure 7This is a schematic diagram illustrating the viewing angle attenuation curves of a blue light device after a modulation layer is applied to the light-emitting side of the blue light device according to an embodiment of the present invention. It shows the viewing angle attenuation curves for a blue light device with a By value of 0.044, a blue light device with a By value of 0.053, a blue light device with a modulation layer applied to the light-emitting side of the blue light device with a By value of 0.044, and a blue light device with a modulation layer applied to the light-emitting side of the blue light device with a By value of 0.053. Table 3 shows the numerical values ​​of the viewing angle attenuation of the blue light device after a modulation layer is applied to the light-emitting side of the blue light device.

[0066] Table 3

[0067]

[0068] It can be seen that the modulation layer accelerates the spectral brightness decay of blue light, and the acceleration increases with the increase of the spectral angle. In this embodiment, in order to reduce Bx to meet the BT2020 requirements, the microcavity length is increased in the device structure (which will simultaneously increase By); at the same time, in order to maintain By, a modulation layer is introduced. This allows for an initial increase in the microcavity length to slow down the spectral brightness decay, followed by the introduction of the modulation layer to accelerate the spectral brightness decay, resulting in an initial increase followed by a decrease. Compared to blue light devices that directly incorporate a modulation layer without structural adjustments, the spectral brightness decay in this embodiment is reduced.

[0069] Figure 8 This is a schematic diagram of the white light color deviation trajectory of a display substrate according to an embodiment of the present invention. It shows the white light emitted from the display substrate after the blue light device is directly combined with the control layer without structural adjustment, and the white light emitted from the display substrate after the blue light device is combined with the control layer following structural adjustment. The three elliptical closed shapes, from the inside out, represent 3.0 JNCD (Just Noticeable Color Difference), 4.5 JNCD, and 7.0 JNCD, respectively. Figure 9 This is a schematic diagram of the brightness attenuation of white light emitted from a display substrate at different viewing angles according to an embodiment of the present invention. It shows the color shift curves of white light emitted from the display substrate at different viewing angles when the blue light device is directly combined with the control layer without structural adjustment, and the color shift curves of white light emitted from the display substrate at different viewing angles when the blue light device is combined with the control layer after structural adjustment.

[0070] Table 4 shows the color shift values ​​of white light emitted from the display substrate at different viewing angles when the blue light device is directly combined with the control layer without structural adjustment, and the color shift values ​​of white light emitted from the display substrate at different viewing angles when the blue light device is combined with the control layer after structural adjustment.

[0071] Table 4

[0072]

[0073] It can be seen that after structural adjustment and the setting of the control layer, the color deviation value of white light at a large viewing angle (≥45°) is significantly reduced, which can improve the color deviation phenomenon at a large viewing angle and improve the display quality of the display substrate.

[0074] Embodiments of the present invention also provide a display device, including a display substrate as described above.

[0075] The display device includes, but is not limited to, components such as: a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. Those skilled in the art will understand that the above-described structure of the display device does not constitute a limitation on the display device; the display device may include more or fewer of the aforementioned components, or combine certain components, or arrange different components. In embodiments of the present invention, the display device includes, but is not limited to, a monitor, a mobile phone, a tablet computer, a television set, a wearable electronic device, a navigation display device, etc.

[0076] The display device can be any product or component with display function, such as a television, monitor, digital photo frame, mobile phone, or tablet computer. The display device also includes a flexible circuit board, a printed circuit board, and a backplate.

[0077] An embodiment of the present invention also provides a method for manufacturing a display substrate, wherein the method comprises:

[0078] Provide a substrate;

[0079] A plurality of light-emitting devices are formed on the substrate, including blue light-emitting devices;

[0080] A modulation layer is formed on the light-emitting side of the blue light device. The peak wavelength of the transmission spectrum of the modulation layer is the same as the peak wavelength of the emission spectrum of the blue light device. The first wavelength range of the transmission spectrum of the modulation layer includes the wavelength range corresponding to the emission spectrum of the blue light device. The half-wavelength peak width of the modulation layer is more than twice that of the half-wavelength peak width of the blue light device. The first wavelength range is a portion of the wavelength range corresponding to the transmission spectrum of the modulation layer.

[0081] In this embodiment, by setting a modulation layer on the light-emitting side of the blue light device, the emission spectrum of the blue light emitted by the blue light device can be modulated. This can reduce the blue light color coordinate Bx while avoiding a significant increase in the blue light color coordinate By, thereby ensuring the color gamut coverage of the emission spectrum of the display substrate.

[0082] In this embodiment, the peak wavelength of the transmission spectrum is the wavelength corresponding to the maximum transmittance, the peak wavelength of the emission spectrum is the wavelength corresponding to the maximum emission intensity, and the half-wavelength is the distance from the maximum amplitude of the wave to half its amplitude. The first wavelength range can be from the peak wavelength corresponding to 1% transmittance to the cutoff wavelength corresponding to 1% transmittance. By designing the parameters of the control layer 04, this embodiment can improve the matching degree between the blue light emitted by the display substrate and the requirements of CIE and BT2020.

[0083] In some embodiments, forming the control layer includes:

[0084] The control layer is formed on the light-emitting side of the blue light device by vapor deposition using at least one of the following materials: phthalocyanine organic pigments, diketopyrrolopyrrolo organic pigments, and pyrrolopyrrolodione organic pigments.

[0085] In some embodiments, at least one of the following materials is dispersed in gelatin, acrylic resin or polyvinyl alcohol resin to obtain a mixture material: phthalocyanine organic pigment, diketopyrrole organic pigment, pyrrole diketopyrrole organic pigment;

[0086] The control layer is obtained by coating the mixture material or inkjet printing the mixture material on the light-emitting side of the blue light device.

[0087] In this embodiment, the structure of the blue light device can be adjusted to increase the microcavity length of the blue light device, making the microcavity length of the blue light device greater than 260nm. By adjusting the structure and setting a control layer, the color gamut coverage of the display substrate can be effectively improved.

[0088] To reduce By, this embodiment adds a modulation layer to the light-emitting side of the blue light device and designs the parameters of the modulation layer: the peak wavelength of the transmission spectrum of the modulation layer is designed to be the same as the peak wavelength of the emission spectrum of the blue light device, the first wavelength range of the transmission spectrum of the modulation layer includes the wavelength range corresponding to the emission spectrum of the blue light device, the half-wavelength peak width of the modulation layer is more than 5 times that of the blue light device, and the cutoff wavelength of the transmission spectrum of the modulation layer is C, the cutoff wavelength of the emission spectrum of the blue light device is D, C is greater than D, and the difference between C and D is not greater than 40 nm, so that the transmission spectrum can suppress the luminescence intensity of the long-wavelength band of the electroluminescence spectrum, thereby suppressing the increase of ΔBy after the microcavity length of the blue light device increases.

[0089] In some embodiments, the peak wavelength of the transmission spectrum of the control layer is A, and the peak wavelength of the emission spectrum of the blue light device is B. A is less than B, and the difference between A and B is not less than 60 nm. This can minimize the impact on the brightness decay of the blue light viewing angle.

[0090] In this embodiment, the modulation layer accelerates the spectral brightness decay of blue light, and the acceleration increases with the increase of the spectral angle. In this embodiment, to reduce Bx to meet BT2020 requirements, the microcavity length is increased in the device structure (which simultaneously increases By); simultaneously, to maintain By, a modulation layer is introduced. This allows for an initial increase in microcavity length to slow down spectral brightness decay, followed by the introduction of the modulation layer to accelerate spectral brightness decay, resulting in an initial increase followed by a decrease. Compared to blue light devices that directly incorporate a modulation layer without structural adjustments, this embodiment exhibits a slower spectral brightness decay.

[0091] In this embodiment, after structural adjustment and the setting of the control layer, the blue light device can also significantly reduce the color shift value of white light at a large viewing angle (≥45°), which can improve the color shift phenomenon at a large viewing angle and improve the display quality of the display substrate.

[0092] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, since the embodiments are basically similar to the product embodiments, the descriptions are relatively simple, and the relevant parts can be referred to the descriptions of the product embodiments.

[0093] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0094] It is understandable that when a component such as a layer, film, region, or substrate is referred to as being "above" or "below" another component, the component may be "directly" located "above" or "below" the other component, or there may be intermediate components present.

[0095] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0096] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A display substrate, characterized in that, include: Substrate; A plurality of light-emitting devices located on the substrate, the light-emitting devices including blue light-emitting devices; The modulation layer located on the light-emitting side of the blue light device has a peak wavelength of transmission spectrum that is the same as the peak wavelength of emission spectrum of the blue light device. The first wavelength range of transmission spectrum of the modulation layer includes the wavelength range corresponding to emission spectrum of the blue light device. The half-wavelength peak width of the modulation layer is more than twice that of the half-wavelength peak width of the blue light device. The first wavelength range is a portion of the wavelength range corresponding to transmission spectrum of the modulation layer. The blue light device has a microcavity length greater than 260 nm, and the control layer uses at least one of the following: phthalocyanine organic pigments, diketopyrrolopyrrolo organic pigments, and pyrrolopyrrolodione organic pigments.

2. The display substrate according to claim 1, characterized in that, The first wavelength range is from the peak wavelength corresponding to 1% transmittance to the cutoff wavelength corresponding to 1% transmittance.

3. The display substrate according to claim 1, characterized in that, The half-wavelength of the modulation layer is more than 5 times that of the blue light device.

4. The display substrate according to any one of claims 1-3, characterized in that, The peak wavelength of the transmission spectrum of the control layer is A, and the peak wavelength of the emission spectrum of the blue light device is B. A is less than B, and the difference between A and B is not less than 60 nm.

5. The display substrate according to any one of claims 1-3, characterized in that, The cutoff wavelength of the transmission spectrum of the control layer is C, and the cutoff wavelength of the emission spectrum of the blue light device is D. C is greater than D, and the difference between C and D is not greater than 40 nm.

6. A display device, characterized in that, Includes the display substrate as described in any one of claims 1-5.

7. A method for manufacturing a display substrate, characterized in that, include: Provide a substrate; A plurality of light-emitting devices are formed on the substrate, including blue light-emitting devices; A modulation layer is formed on the light-emitting side of the blue light device. The peak wavelength of the transmission spectrum of the modulation layer is the same as the peak wavelength of the emission spectrum of the blue light device. The first wavelength range of the transmission spectrum of the modulation layer includes the wavelength range corresponding to the emission spectrum of the blue light device. The half-wavelength peak width of the modulation layer is more than twice that of the half-wavelength peak width of the blue light device. The first wavelength range is a portion of the wavelength range corresponding to the transmission spectrum of the modulation layer. The formation of the control layer includes: The control layer is formed on the light-emitting side of the blue light device by vapor deposition using at least one of the following materials: phthalocyanine organic pigments, diketopyrrolopyrrolo organic pigments, and pyrrolopyrrolodione organic pigments; or At least one of the following materials is dispersed in gelatin, acrylic resin or polyvinyl alcohol resin to obtain a mixture material: phthalocyanine organic pigment, diketopyrrole organic pigment, pyrrole diketopyrrole organic pigment; the control layer is obtained by coating the mixture material or inkjet printing the mixture material on the light-emitting side of the blue light device; The method further includes: Increase the microcavity length of the blue light device so that the microcavity length of the blue light device is greater than 260nm.

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