CN113991041B - Display substrate and display device - Google Patents
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- CN113991041B CN113991041B CN202111256245.7A CN202111256245A CN113991041B CN 113991041 B CN113991041 B CN 113991041B CN 202111256245 A CN202111256245 A CN 202111256245A CN 113991041 B CN113991041 B CN 113991041B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/19—Tandem OLEDs
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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Abstract
The display substrate comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, the display substrate comprises a light-emitting structure layer and a lens layer which are sequentially overlapped on a substrate, the light-emitting structure layer comprises a plurality of light-emitting devices, the lens layer comprises a plurality of micro lenses, and each micro lens is arranged on the light-emitting side of a corresponding light-emitting device; each sub-pixel comprises one light emitting device and one micro lens arranged on the light emitting side of the light emitting device; the orthographic projection of the pixel opening of the blue sub-pixel on the substrate is positioned in the middle area of the orthographic projection of the micro lens of the blue sub-pixel on the substrate, and the orthographic projection area of the micro lens of the blue sub-pixel on the substrate is 1.5 times to 2 times of the orthographic projection area of the pixel opening of the blue sub-pixel on the substrate. The display substrate of the embodiment of the disclosure can improve the blue light emitting efficiency.
Description
Technical Field
The embodiment of the disclosure relates to the technical field of display, in particular to a display substrate and a display device.
Background
Some silicon-based organic light emitting diode micro (micro OLED) displays adopt white light emitting devices and are matched with color filter layers to realize full-color display, and micro lenses are arranged on the light emitting side of each light emitting device to gather light, so that the positive visual angle brightness of the display module is increased. However, some micro OLED displays have a problem of low blue light emitting efficiency, so after a display module is manufactured subsequently, gamma (Gamma) adjustment needs to be performed on RGB pixels during electrical adjustment, different current densities are given to the RGB pixels to ensure that the color point of the finally synthesized white light is about (0.31, 0.33), and relatively weaker blue light needs to be given more current, which increases the load of the blue sub-pixels during use, so that the service life of the blue light is less than that of red light and green light, which affects the overall service life of the display module, and also causes components of the red light and the green light to become more during use, so that the display screen becomes gradually yellow, and the display effect is affected.
Disclosure of Invention
The embodiment of the disclosure provides a display substrate and a display device, which can improve the blue light emergent efficiency of the display substrate.
The embodiment of the disclosure provides a display substrate, which comprises a plurality of pixel units arranged on a substrate in an array manner, wherein each pixel unit comprises a red sub-pixel for emitting red light, a green sub-pixel for emitting green light and a blue sub-pixel for emitting blue light;
the display substrate comprises a driving structure layer, a light-emitting structure layer and a lens layer which are sequentially stacked on a base; the light emitting structure layer comprises a first electrode layer, a pixel definition layer, a light emitting function layer and a second electrode layer, wherein the first electrode layer comprises a plurality of first electrodes arranged on the driving structure layer, the pixel definition layer is arranged on one side of the plurality of first electrodes far away from the substrate and is provided with a first pixel opening for limiting the red sub-pixel, a second pixel opening for limiting the green sub-pixel and a third pixel opening for limiting the blue sub-pixel, and each pixel opening exposes the surface of a corresponding first electrode far away from the substrate; the second electrode layer is arranged on one side of the light-emitting functional layer, which is far away from the substrate, and each of the first electrode, the second electrode layer and the light-emitting functional layer between the first electrode and the second electrode layer form a light-emitting device; the lens layer comprises a plurality of micro lenses, and each micro lens is arranged on the light emitting side of a corresponding light emitting device;
each sub-pixel comprises one light emitting device and one micro-lens arranged on the light emitting side of the light emitting device, the orthographic projection of the third pixel opening on the substrate is positioned in the middle area of the orthographic projection of the micro-lens of the blue sub-pixel on the substrate, and the orthographic projection area of the micro-lens of the blue sub-pixel on the substrate is 1.5 times to 2 times of the orthographic projection area of the third pixel opening on the substrate.
The embodiment of the disclosure also provides a display device, which comprises the display substrate.
In the display substrate of the embodiment of the disclosure, the orthographic projection of the third pixel opening of the blue sub-pixel on the substrate is limited to be positioned in the middle area of the orthographic projection of the micro lens of the blue sub-pixel on the substrate, and the orthographic projection area of the micro lens of the blue sub-pixel on the substrate is 1.5 times to 2 times of the orthographic projection area of the third pixel opening on the substrate, so that the light rays emitted by the light emitting device of the blue sub-pixel can be gathered more towards the forward viewing angle direction of the display substrate after passing through the micro lens, the light emitting efficiency of the blue light is improved, the load of the light emitting device of the blue sub-pixel is reduced, the whole service life of the display substrate is prolonged, and the display effect is improved.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosed embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain, without limitation, the disclosed embodiments. The shapes and sizes of the components in the drawings do not reflect true proportions, and are intended to illustrate the present disclosure only.
FIG. 1 is a schematic view of a partial cross-sectional structure of a display substrate according to some techniques;
FIG. 2 is a schematic diagram of a partial cross-sectional structure of a display substrate according to some exemplary embodiments;
FIG. 3 is a schematic diagram of a pixel arrangement of a display substrate according to some example embodiments;
FIG. 4 is a schematic view of a pixel arrangement of a display substrate according to further exemplary embodiments;
FIG. 5 is a schematic diagram of a pixel arrangement of a display substrate according to yet other exemplary embodiments;
fig. 6 is a schematic diagram of a film structure of a light emitting device in a display substrate according to some exemplary embodiments.
The reference numerals are:
10. the substrate is provided with a plurality of holes,
20. a driving structure layer, 201, an isolation groove structure,
31. a first electrode, 32, a light-emitting functional layer, 33, a second electrode layer, 34, a pixel defining layer,
40. packaging structure layer, 50, color filter layer, 60, flat layer, 71, microlens,
341. first pixel openings 342, second pixel openings 343, third pixel openings,
321. first hole injection layer 322, first hole transport layer 323, first light-emitting layer 324, second light-emitting layer 325, first electron transport layer 326, charge generation layer 327, second hole injection layer 328, second hole transport layer 329, third hole transport layer 3210, third light-emitting layer 3211, hole blocking layer 3212, second electron transport layer 3213, second electron injection layer.
Detailed Description
It will be understood by those skilled in the art that modifications and equivalents may be made to the disclosed embodiments without departing from the spirit and scope of the disclosed embodiments, which are intended to be encompassed by the scope of the claims of the present disclosure.
The back plate of a silicon-based OLED micro-display panel adopts an integrated circuit to control an OLED light-emitting device, which greatly increases the resolution of the panel (which can be generally more than 3000 ppi). This also presents a significant challenge for OLED display devices: the conventional Fine Metal Mask (FMM) can achieve about 800PPI at most, which means that it is difficult to perform evaporation of organic layers such as a light emitting layer by using a Side by Side single color device (SBS) in a silicon-based OLED panel, and other means are required to separate OLED pixels. Such separation means include, but are not limited to, high-separation columns (TF), interpixel hole digs (DOW on wafer, DOW), etc., which cannot be achieved at the time of vapor deposition. Therefore, the whole-surface evaporation of the OLED is almost necessarily selected in the field of silicon-based OLED micro-displays.
Because SBS alone RGB monochrome devices cannot be made like OLED panels for cell phones, the silicon-based OLED microdisplay can only use white light devices. Some silicon-based OLED micro-displays adopt a device structure of a single luminescent layer to realize white light emission, the luminescent layer structure adopts a plurality of different luminescent material combinations to realize white light, the module brightness is generally 80 nit to 600 nit, the display belongs to a medium-low brightness display, if the single-layer structure is adopted to realize high brightness (more than 1000 nit), the power consumption and the service life are sacrificed, but the production bottleneck of the device is lower, and the companies with the capability of producing are more. In order to improve the efficiency, brightness and lifetime of silicon-based OLED micro-displays, stacked OLED devices (tandem OLED) with more than two light-emitting layers are introduced, and so-called charge generation layers (charge generation layer, CGL) are applied to connect two light-emitting units in series, so as to realize the effect of light emission superposition on the device, which can successfully improve the current efficiency, output brightness, operational lifetime and other important photoelectric properties.
The white light device is matched with RGB color glue (color filter layer) to realize full-color display, but the transmittance of the color glue is only about 20% at present, and the transmittance of the blue color glue is often less than 20%. This requires that we prefer to increase the efficiency of blue light when making OLED devices. In addition, after the subsequent module is manufactured, gamma (Gamma) adjustment is needed to be performed on the RGB pixels during electrical adjustment, different current densities are given to the RGB pixels so as to ensure that the color point of the finally synthesized white light is about (0.31, 0.33), and relatively weaker blue light needs to be given more current, so that the load of the blue sub-pixels during use is increased, the service life of the blue light is smaller than that of red light and green light, the overall service life of the module is influenced, and the components of the red light and the green light are increased during use, so that a display picture becomes yellow gradually, and the display effect is influenced.
As shown in fig. 1, fig. 1 is a schematic view of a partial cross-sectional structure of a display substrate according to some technologies, wherein the display substrate includes a driving structure layer 20 and a light emitting structure layer sequentially stacked on a substrate 10, the light emitting structure layer includes a first electrode layer, a pixel defining layer 34, a light emitting function layer 32 and a second electrode layer 33, the first electrode layer includes a plurality of first electrodes 31, each of the first electrodes 31, the second electrode layer 33, and the light emitting function layer 32 located between the first electrodes 31 and the second electrode layer 33 forms a light emitting device. The light emitting device in fig. 1 is a tandem light emitting device and emits white light, and the light emitting functional layer 32 of the tandem light emitting device includes at least two light emitting units connected in series, and a charge generating layer is disposed between the two light emitting units, and the charge generating layer can generate holes and electrons under the voltage action of the first electrode 31 and the second electrode layer 33. The light-emitting functional layer 32 including the charge generation layer is usually formed by evaporation on the whole surface during the preparation process, but because the lateral conductivity of the charge generation layer is relatively high, if the charge generation layer is continuous between adjacent sub-pixels, pixel cross color problem is easily caused, so that in some techniques, an isolation groove structure 201 is arranged on an insulating layer of the driving structural layer 20 far from the substrate 10, and the charge generation layer formed by evaporation on the whole surface is disconnected at the isolation groove structure 201 by arranging the isolation groove structure 201, so as to avoid the pixel cross color problem. However, the arrangement of the isolation trench structure 201 may cause the morphology of the second electrode layer 33 to change, and the region of the second electrode layer 33 opposite to the isolation trench structure 201 and the nearby region may be recessed to form a recessed region, so that the distance (such as the distance b and the distance c in fig. 1) between the first electrode 31 and the second electrode layer 33 is closer to the edge region of the pixel opening region near the isolation trench structure 201, and the distance (such as the distance a in fig. 1) between the first electrode 31 and the second electrode layer 33 is farther to the middle region of the pixel opening region, which causes the resistance of the edge region of the pixel opening region to be smaller than that of the middle region, and thus the current flows more easily from the edge region of the pixel opening region to the cathode, whereas in the tandem light emitting device, the blue light emitting layer is disposed closer to the second electrode layer 33 than the red light emitting layer and the green light emitting layer, and thus the blue light is more likely to concentrate on the edge of the pixel.
In addition, some silicon-based OLED micro-displays are provided with micro-lens (micro-lens) on the light emitting side of the light emitting device, so that the light gathering effect can be achieved, and the brightness of the positive viewing angle of the module is increased. However, the micro-lens is mainly used for gathering light in the central area of the pixel, the gathering capability of the light on the edge of the pixel is poor (divergence is carried out), and blue light is mainly concentrated in the edge area of the pixel, so that the gain of the micro-lens to blue light is smaller than that of red light and green light, a great deal of waste is caused to weak blue light, the proportion of blue light and red-green light in the spectrum of the module is increased, and the brightness and the service life of a product are not as expected.
An embodiment of the disclosure provides a display substrate, as shown in fig. 2 and 3, fig. 2 is a schematic view of a partial cross-sectional structure of the display substrate of some exemplary embodiments, and fig. 3 is a schematic view of a pixel arrangement structure of the display substrate of some exemplary embodiments, where the display substrate includes a plurality of pixel units P arranged on a base 10 in an array, and each of the pixel units P includes a red sub-pixel R emitting red light, a green sub-pixel G emitting green light, and a blue sub-pixel B emitting blue light.
The display substrate comprises a driving structure layer 20, a light-emitting structure layer and a lens layer which are sequentially stacked on a base 10; the light emitting structure layer includes a first electrode layer including a plurality of first electrodes 31 disposed on the driving structure layer 20, a pixel defining layer 34 disposed on a side of the plurality of first electrodes 31 remote from the substrate 10 and provided with a first pixel opening 341 defining the red subpixel R, a second pixel opening 342 defining the green subpixel G, and a third pixel opening 343 defining the blue subpixel B, each of which exposes a surface of a corresponding one of the first electrodes 31 remote from the substrate 10; the second electrode layer 33 is disposed on a side of the light emitting function layer 32 away from the substrate 10, and each of the first electrode 31, the second electrode layer 33, and the light emitting function layer 32 between the first electrode 31 and the second electrode layer 33 forms a light emitting device; the lens layer includes a plurality of microlenses 71, each microlens 71 being disposed on the light-emitting side of a corresponding one of the light-emitting devices.
Each sub-pixel includes one of the light emitting devices and one of the microlenses 71 disposed on a light emitting side of the light emitting device, a forward projection of the third pixel opening 343 on the substrate 10 is located at a middle region of a forward projection of the microlens 71 of the blue sub-pixel on the substrate 10, and an area of the forward projection of the microlens 71 of the blue sub-pixel on the substrate 10 is 1.5 times to 2 times an area of the forward projection of the third pixel opening 343 on the substrate 10.
In the display substrate of the embodiment of the disclosure, the forward projection of the third pixel opening 343 of the blue sub-pixel B on the substrate 10 is defined in the middle area of the forward projection of the microlens 71 of the blue sub-pixel B on the substrate 10, and the forward projection area of the microlens 71 of the blue sub-pixel B on the substrate 10 is 1.5 to 2 times of the forward projection area of the third pixel opening 343 on the substrate 10, so that the light emitted by the light emitting device of the blue sub-pixel B can gather more in the forward viewing angle direction of the display substrate after passing through the microlens 71, thereby improving the light emitting efficiency of the blue light, reducing the load of the light emitting device of the blue sub-pixel B, improving the overall service life of the display substrate, and improving the display effect. The display substrate of the embodiments of the present disclosure may be adapted for high resolution (PPI > 2000) silicon-based OLED microdisplays.
In some exemplary embodiments, as shown in fig. 3, the orthographic projection of the first pixel opening 341 on the substrate 10 is located in a middle area of the orthographic projection of the microlens 71 of the red subpixel R on the substrate 10, and the orthographic projection of the microlens 71 of the red subpixel R on the substrate 10 has an area 1.1 to 1.2 times that of the orthographic projection of the first pixel opening 341 on the substrate 10.
The orthographic projection of the second pixel opening 342 on the substrate 10 is located in the middle area of the orthographic projection of the microlens 71 of the green sub-pixel G on the substrate 10, and the orthographic projection area of the microlens 71 of the green sub-pixel G on the substrate 10 is 1.1 times to 1.2 times the orthographic projection area of the second pixel opening 342 on the substrate 10.
In some exemplary embodiments, as shown in fig. 3, the area of the orthographic projection of the third pixel opening 343 on the substrate 10 is smaller than the area of the orthographic projection of the first pixel opening 341 on the substrate 10, and smaller than the area of the orthographic projection of the second pixel opening 342 on the substrate 10.
Illustratively, the area of the front projection of the first pixel opening 341 on the substrate 10 is S1, the area of the front projection of the second pixel opening 342 on the substrate 10 is S2, and the area of the front projection of the third pixel opening 343 on the substrate 10 is S3, then S1: s2: s3 may be 1.5:1.5:1. The sizes and shapes of the microlenses 71 of the red subpixel R, the microlenses 71 of the green subpixel G, and the microlenses 71 of the blue subpixel B may be the same, and the area of the orthographic projection of the microlenses 71 on the substrate 10 is S0, s0=1.5×s3 to 2×s3. The microlenses 71 may be convex lenses, and a surface of the microlenses 71 facing away from the substrate 10 may be spherical. Illustratively, the shapes of the first pixel opening 341, the second pixel opening 342, and the third pixel opening 343 may be the same or different, such as circular, elliptical, rectangular, or the like. The shape of the orthographic projection of the microlens 71 of each sub-pixel on the substrate 10 may be the same as the shape of the pixel opening defining the sub-pixel. The material of the lens layer may be an organic material, and may be formed through processes such as film formation, exposure, development, baking, etc., or the material of the lens layer may be an inorganic material (e.g., a silicon oxide compound), and may be formed through processes such as film formation, exposure, development, etching, etc.
In some exemplary embodiments, as shown in fig. 3, each of the pixel units P may include one red sub-pixel R, one green sub-pixel G, and two blue sub-pixels B. In this embodiment, each pixel unit P is provided with a red sub-pixel R, a green sub-pixel G and two blue sub-pixels B, so that the light emitting area of the blue sub-pixels B can be increased, the aperture ratio of the blue sub-pixels B can be increased, the light emitting of blue light can be increased, the proportion of blue light, red light and green light can be adjusted, and the light emitting of the RGB pixels can be balanced, so that the current distribution among the RGB pixels is more balanced, the load of the blue sub-pixels B is reduced, and in addition, the increase of the blue light gain by the micro lens 71 can increase the service life of the product and simultaneously reduce the color shift of the product in use.
In some exemplary embodiments, the two blue sub-pixels B in the pixel unit P are a first blue sub-pixel B and a second blue sub-pixel B, respectively, and the third pixel opening 343 defining the first blue sub-pixel B and the third pixel opening 343 defining the second blue sub-pixel B are the same or different in size.
Illustratively, as shown in fig. 3, the third pixel opening 343 defining the first blue sub-pixel B and the third pixel opening 343 defining the second blue sub-pixel B are the same size.
As shown in fig. 4, fig. 4 is a schematic view illustrating a pixel arrangement structure of a display substrate according to other exemplary embodiments, and a third pixel opening 343 defining the first blue sub-pixel B and a third pixel opening 343 defining the second blue sub-pixel B are different in size. In this way, the light emitting areas of the two blue sub-pixels B in each pixel unit P are different, different currents can be given to the two blue sub-pixels B in the product use process, and the currents of the two blue sub-pixels B can be corrected and compensated through the circuit, so that the product life is maximized.
In some exemplary embodiments, an area of the orthographic projection of the first pixel opening on the substrate may be equal to or greater than an area of the orthographic projection of the second pixel opening on the substrate.
Illustratively, as shown in fig. 3 and 4, the area of the orthographic projection of the first pixel opening 341 on the substrate 10 is equal to the area of the orthographic projection of the second pixel opening 342 on the substrate 10. In this example, the area of the front projection of the microlens 71 of the red subpixel R on the substrate 10 may be equal to the area of the front projection of the microlens 71 of the green subpixel G on the substrate 10.
As shown in fig. 5, fig. 5 is a schematic view of a pixel arrangement structure of a display substrate according to still another exemplary embodiment, and an area of an orthographic projection of the first pixel opening 341 on the base 10 may be larger than an area of an orthographic projection of the second pixel opening 342 on the base 10. In this example, the area of the orthographic projection of the microlens 71 of the red subpixel R on the substrate 10 may be larger than the area of the orthographic projection of the microlens 71 of the green subpixel G on the substrate 10, and the area of the orthographic projection of the microlens 71 of the red subpixel R on the substrate 10 may be equal to the area of the orthographic projection of the microlens 71 of the blue subpixel B on the substrate 10. The area of the front projection of the microlens 71 of the red subpixel R on the substrate 10 may be 1.1 to 1.2 times the area of the front projection of the first pixel opening 341 on the substrate 10. The area of the front projection of the microlens 71 of the green sub-pixel G on the substrate 10 may be 1.1 to 1.2 times the area of the front projection of the second pixel opening 342 on the substrate 10. According to the embodiment, the service life attenuation consistency of the three RGB sub-pixels can be realized by changing the light emitting area proportion of the red sub-pixel R and the green sub-pixel G, and the color cast problem in the using process of the product is reduced.
In some exemplary embodiments, the light emitting device may be a tandem light emitting device and configured to emit white light, the light emitting functional layer includes a first light emitting layer, a second light emitting layer, a charge generating layer, and a third light emitting layer sequentially stacked in a direction away from the substrate, the charge generating layer is configured to generate holes and electrons under a voltage of the first electrode and the second electrode layer, any one of the first light emitting layer and the second light emitting layer is a red light emitting layer, the other is a green light emitting layer, and the third light emitting layer is a blue light emitting layer.
In one example of this embodiment, the first electrode is an anode, the second electrode layer is a cathode, the charge generating layer may include an N-type charge generating layer and a P-type charge generating layer stacked in sequence along a direction away from the first electrode, the N-type charge generating layer and the P-type charge generating layer are in direct contact and form an NP junction, the NP junction is capable of generating electrons and holes in the N-type charge generating layer and the P-type charge generating layer at the same time, the generated electrons may be transported to the side of the first electrode through the N-type charge generating layer, and the generated holes may be transported to the side of the second electrode through the P-type charge generating layer. The N-type charge generation layer may be formed by doping an N-type material into an organic material, and the P-type charge generation layer may be formed by doping a P-type material into an organic material.
In one example of the present embodiment, as shown in fig. 6, fig. 6 is a schematic diagram of a film layer structure of a light emitting device in a display substrate of some exemplary embodiments, the tandem light emitting device may include a first electrode 31 (anode) 31, a first hole injection layer 321, a first hole transport layer 322, a first light emitting layer 323, a second light emitting layer 324, a first electron transport layer 325, a charge generation layer 326, a second hole injection layer 327, a second hole transport layer 328, a third hole transport layer 329, a third light emitting layer 3210, a hole blocking layer 3211, a second electron transport layer 3212, a second electron injection layer 3213, and a second electrode (cathode) layer 33 stacked in order in a direction away from the base; the first light emitting layer 323 may be a red light emitting layer, the second light emitting layer 324 may be a green light emitting layer, the third light emitting layer 3210 may be a blue light emitting layer, and the tandem light emitting device may emit white light. In this example, the film layer between the first electrode 31 and the second electrode layer 33, and the second electrode layer 33 may be formed by evaporation on the whole surface of the open mask.
In one example of the present embodiment, as shown in fig. 2, the display substrate may further include a package structure layer 40 and a color filter layer 50 disposed on a side of the light emitting structure layer remote from the substrate 10. The color filter layer 50 may be disposed on a surface of the package structure layer 40 away from the substrate 10, the lens layer may be disposed on a side of the color filter layer 50 away from the substrate 10, a flat layer 60 may be disposed on a surface of the color filter layer 50 away from the substrate 10, the lens layer may be disposed on a surface of the flat layer 60 away from the substrate 10, and the provision of the flat layer 60 may make the height of each microlens 71 in the lens layer more uniform.
The encapsulation structure layer 40 may include a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer sequentially stacked in a direction away from the substrate 10. The color filter layer 50 includes a plurality of red filter units, a plurality of green filter units, and a plurality of blue filter units. Each red filter unit is arranged on the light emitting side of the light emitting device of the red sub-pixel R so that the red sub-pixel R emits red light; each green filter unit is arranged on the light emitting side of the light emitting device of the green sub-pixel G so as to enable the green sub-pixel G to emit green light; each of the blue filter units is disposed on a light emitting side of the light emitting device of the blue sub-pixel B to emit blue light from the blue sub-pixel B.
In some exemplary embodiments, as shown in fig. 2, the driving structure layer 20 includes an insulating layer away from the substrate 10, and the insulating layer may be provided with a grid-shaped isolation trench structure 201, where the isolation trench structure 201 includes a plurality of grid cells, and each grid cell surrounds one of the first electrodes 31; the charge generation layer is partitioned by the isolation trench structure 201, and a distance between the third pixel opening 343 and the isolation trench structure 201 is greater than a distance between the first pixel opening and the isolation trench structure 201, and greater than a distance between the second pixel opening and the isolation trench structure 201.
In one example of the present embodiment, a distance between the third pixel opening and the isolation trench structure may be 1.8 μm to 2.2 μm, a distance between the first pixel opening and the isolation trench structure may be 0.8 μm to 1.2 μm, and a distance between the second pixel opening and the isolation trench structure may be 0.8 μm to 1.2 μm.
In this embodiment, the distance between the third pixel opening 343 and the isolation trench structure 201 is set to be 1.8 μm to 2.2 μm, so that, since the distance between the third pixel opening 343 and the isolation trench structure 201 is far, even if the second electrode layer 33 is recessed at the position corresponding to the isolation trench structure 201, the distance between the first electrode 31 and the second electrode layer 33 of the blue sub-pixel B is not greatly different between the pixel center region and the pixel edge region, which affects the blue light emission.
In one example of the present embodiment, as shown in fig. 2, the display substrate may be a micro OLED display substrate, and the driving structure layer 20 includes a plurality of pixel driving circuits, each of which is connected to one of the light emitting devices. The substrate 10 may be a silicon substrate 10, the pixel driving circuit may be a CMOS (complementary metal oxide semiconductor) pixel driving circuit, and a film layer of the driving structure layer 20 away from the substrate 10 may be a silicon dioxide insulating layer.
The embodiment of the disclosure also provides a display device, including the display substrate according to any one of the embodiments. The display device may be a near-eye display device, such as a head mounted display, augmented Reality (AR) glasses, virtual Reality (VR) all-in-one, or the like. Alternatively, the display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
In the drawings, the size of constituent elements, thicknesses of layers, or regions may be exaggerated for clarity. Accordingly, embodiments of the present disclosure are not necessarily limited to this dimension, and the shape and size of each component in the drawings do not reflect the true scale. Furthermore, the figures schematically illustrate some examples, and embodiments of the present disclosure are not limited to the shapes or values illustrated in the figures.
In the description herein, "parallel" refers to a state in which two straight lines form an angle of-10 ° or more and 10 ° or less, and thus includes a state in which the angle is-5 ° or more and 5 ° or less. The term "perpendicular" refers to a state in which the angle formed by two straight lines is 80 ° or more and 100 ° or less, and thus includes a state in which the angle is 85 ° or more and 95 ° or less.
In the description herein, the positional or positional relationship indicated by the terms "upper", "lower", "left", "right", "top", "inner", "outer", "axial", "four corners", and the like are based on the positional or positional relationship shown in the drawings, and are merely for convenience in describing the embodiments of the present disclosure, and are not indicative or implying that the structure referred to has a specific orientation, is configured and operated in a specific orientation, and thus is not to be construed as limiting the present disclosure.
In the description herein, unless explicitly stated and limited otherwise, the terms "connected," "fixedly connected," "mounted," "assembled" and "mounted" are to be construed broadly, and may be, for example, fixedly connected, or detachably connected, or integrally connected; the terms "mounted," "connected," "fixedly connected," and "coupled" may be directly connected, indirectly connected through intervening media, or in communication between two elements. The meaning of the above terms in the embodiments of the present disclosure may be understood by those of ordinary skill in the art as appropriate.
Claims (10)
1. A display substrate, characterized in that: the pixel unit comprises a red sub-pixel emitting red light, a green sub-pixel emitting green light and a blue sub-pixel emitting blue light;
the display substrate comprises a driving structure layer, a light-emitting structure layer and a lens layer which are sequentially stacked on a base; the light emitting structure layer comprises a first electrode layer, a pixel definition layer, a light emitting function layer and a second electrode layer, wherein the first electrode layer comprises a plurality of first electrodes arranged on the driving structure layer, the pixel definition layer is arranged on one side of the plurality of first electrodes far away from the substrate and is provided with a first pixel opening for limiting the red sub-pixel, a second pixel opening for limiting the green sub-pixel and a third pixel opening for limiting the blue sub-pixel, and each pixel opening exposes the surface of a corresponding first electrode far away from the substrate; the second electrode layer is arranged on one side of the light-emitting functional layer, which is far away from the substrate, and each of the first electrode, the second electrode layer and the light-emitting functional layer between the first electrode and the second electrode layer form a light-emitting device; the lens layer comprises a plurality of micro lenses, and each micro lens is arranged on the light emitting side of a corresponding light emitting device;
each sub-pixel comprises one light emitting device and one micro-lens arranged on the light emitting side of the light emitting device, the orthographic projection of the third pixel opening on the substrate is positioned in the middle area of the orthographic projection of the micro-lens of the blue sub-pixel on the substrate, and the orthographic projection area of the micro-lens of the blue sub-pixel on the substrate is 1.5 times to 2 times of the orthographic projection area of the third pixel opening on the substrate; the difference between the area of the orthographic projection of the microlens of the blue sub-pixel on the substrate and the area of the orthographic projection of the third pixel opening on the substrate is d3;
the orthographic projection of the first pixel opening on the substrate is positioned in the middle area of the orthographic projection of the micro lens of the red sub-pixel on the substrate, and the difference value between the orthographic projection area of the micro lens of the red sub-pixel on the substrate and the orthographic projection area of the first pixel opening on the substrate is d1;
the orthographic projection of the second pixel opening on the substrate is positioned in the middle area of the orthographic projection of the micro lens of the green sub-pixel on the substrate, and the difference value between the orthographic projection area of the micro lens of the green sub-pixel on the substrate and the orthographic projection area of the second pixel opening on the substrate is d2;
wherein d3> d1, or/and d3> d2.
2. The display substrate of claim 1, wherein: the area of the orthographic projection of the microlens of the red sub-pixel on the substrate is 1.1 times to 1.2 times that of the orthographic projection of the first pixel opening on the substrate;
or/and, the area of the orthographic projection of the micro lens of the green sub-pixel on the substrate is 1.1 times to 1.2 times of the area of the orthographic projection of the second pixel opening on the substrate.
3. The display substrate of claim 1, wherein: the area of the orthographic projection of the third pixel opening on the substrate is smaller than the area of the orthographic projection of the first pixel opening on the substrate and smaller than the area of the orthographic projection of the second pixel opening on the substrate.
4. A display substrate according to claim 3, wherein: each pixel unit comprises a red sub-pixel, a green sub-pixel and two blue sub-pixels.
5. The display substrate of claim 4, wherein: the two blue sub-pixels in the pixel unit are a first blue sub-pixel and a second blue sub-pixel respectively, and the size of a third pixel opening defining the first blue sub-pixel and the size of a third pixel opening defining the second blue sub-pixel are the same or different.
6. A display substrate according to claim 3, wherein: the area of the orthographic projection of the first pixel opening on the substrate is equal to or larger than the area of the orthographic projection of the second pixel opening on the substrate.
7. The display substrate of claim 1, wherein: the light emitting device is a serial light emitting device and is arranged to emit white light, the light emitting functional layer comprises a first light emitting layer, a second light emitting layer, a charge generating layer and a third light emitting layer which are sequentially stacked along the direction far away from the substrate, the charge generating layer is arranged to generate holes and electrons under the action of the voltage of the first electrode and the voltage of the second electrode layer, any one of the first light emitting layer and the second light emitting layer is a red light emitting layer, the other one is a green light emitting layer, and the third light emitting layer is a blue light emitting layer;
the display substrate further comprises a color filter layer arranged on one side, far away from the substrate, of the light-emitting structure layer, the color filter layer comprises a plurality of red filter units, a plurality of green filter units and a plurality of blue filter units, each red filter unit is arranged on the light-emitting side of the light-emitting device of the red sub-pixel, each green filter unit is arranged on the light-emitting side of the light-emitting device of the green sub-pixel, and each blue filter unit is arranged on the light-emitting side of the light-emitting device of the blue sub-pixel.
8. The display substrate of claim 7, wherein: the driving structure layer comprises an insulating layer far away from the substrate, the insulating layer is provided with a grid-shaped isolation groove structure, the isolation groove structure comprises a plurality of grid cells, and each grid cell surrounds one first electrode; the charge generation layer is separated by the isolation trench structure, and the distance between the third pixel opening and the isolation trench structure is greater than the distance between the first pixel opening and the isolation trench structure, and greater than the distance between the second pixel opening and the isolation trench structure.
9. The display substrate of claim 8, wherein: the distance between the third pixel opening and the isolation trench structure is 1.8 μm to 2.2 μm, the distance between the first pixel opening and the isolation trench structure is 0.8 μm to 1.2 μm, and the distance between the second pixel opening and the isolation trench structure is 0.8 μm to 1.2 μm.
10. A display device, characterized in that: a display substrate comprising any of claims 1 to 9.
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| CN113161397B (en) * | 2021-03-31 | 2023-12-26 | 京东方科技集团股份有限公司 | Display substrate, display device and preparation method of display device |
| CN117204136A (en) * | 2022-03-16 | 2023-12-08 | 京东方科技集团股份有限公司 | Display substrate and display device |
| CN117500304A (en) * | 2022-07-22 | 2024-02-02 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN115498129A (en) * | 2022-09-23 | 2022-12-20 | 京东方科技集团股份有限公司 | Display panel and display device |
| WO2024103351A1 (en) * | 2022-11-17 | 2024-05-23 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN118575612A (en) * | 2022-11-29 | 2024-08-30 | 京东方科技集团股份有限公司 | Display panel and display device |
| WO2024187300A1 (en) * | 2023-03-10 | 2024-09-19 | 京东方科技集团股份有限公司 | Display panel and display apparatus |
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