CN113991041A - Display substrate and display device - Google Patents
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- CN113991041A CN113991041A CN202111256245.7A CN202111256245A CN113991041A CN 113991041 A CN113991041 A CN 113991041A CN 202111256245 A CN202111256245 A CN 202111256245A CN 113991041 A CN113991041 A CN 113991041A
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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
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- 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
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- 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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- 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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- 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
A display substrate and a display device relate to the technical field of display, 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 stacked 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 area of the orthographic projection of the micro-lens of the blue sub-pixel on the substrate is 1.5 times to 2 times of the area of the orthographic projection of the pixel opening of the blue sub-pixel on the substrate. The display substrate of the embodiment of the disclosure can improve the light extraction efficiency of blue light.
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 a micro lens is arranged on the light emitting side of each light emitting device to play a role of gathering light rays and increase the front view angle brightness of the display module. However, some micro OLED displays have a problem of low blue light emitting efficiency, so after a display module is manufactured subsequently, when electrical debugging is performed, Gamma (Gamma) debugging needs to be performed on RGB pixels, different current densities are given to the RGB pixels to ensure that a color point of white light finally synthesized is about (0.31,0.33), and more current needs to be given to blue light which is relatively weak, which increases a load of a blue sub-pixel during use, so that a lifetime of the blue light is shorter than lifetimes of red light and green light, which may affect an overall lifetime of the display module, and may cause components of the red light and the green light to be increased during use, so that a display screen gradually turns yellow, and a 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 extraction 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 substrate; the light emitting structure layer comprises a first electrode layer, a pixel defining layer, a light emitting function layer and a second electrode layer, the first electrode layer comprises a plurality of first electrodes arranged on the driving structure layer, the pixel defining layer is arranged on one side, away from the substrate, of the plurality of first electrodes and is provided with a first pixel opening for defining the red sub-pixel, a second pixel opening for defining the green sub-pixel and a third pixel opening for defining the blue sub-pixel, and each pixel opening exposes the surface, away from the substrate, of the corresponding first electrode; the second electrode layer is arranged on the side, far away from the substrate, of the light-emitting functional layer, and each first electrode, the second electrode layer and the light-emitting functional layer positioned 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.
The display substrate of the embodiment of the disclosure defines that the orthographic projection of the third pixel opening of the blue sub-pixel on the substrate is located in the middle area of the orthographic projection of the microlens of the blue sub-pixel on the substrate, and the orthographic projection area of the microlens 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 light emitted by the light emitting device of the blue sub-pixel can be gathered towards the front viewing angle direction of the display substrate more after passing through the microlens, the light extraction efficiency of blue light is improved, the load of the light emitting device of the blue sub-pixel is reduced, the overall 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 example serve to explain the principles of the disclosure and not to limit the disclosure. The shapes and sizes of the components in the drawings are not to scale and are merely illustrative of the present disclosure.
FIG. 1 is a schematic diagram of a partial cross-sectional structure of a display substrate according to some techniques;
FIG. 2 is a schematic partial cross-sectional view of a display substrate according to some exemplary embodiments;
fig. 3 is a schematic view of a pixel arrangement structure of a display substrate according to some exemplary 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 view of a pixel arrangement of a display substrate according to still other exemplary embodiments;
fig. 6 is a schematic view of a film structure of a light emitting device in a display substrate according to some exemplary embodiments.
The reference signs are:
10. a substrate, a first electrode and a second electrode,
20. a driving structure layer, 201, an isolation trench structure,
31. a first electrode 32, a light-emitting functional layer 33, a second electrode layer 34, a pixel defining layer,
40. a package structure layer, 50, a color filter layer, 60, a planarization layer, 71, a microlens,
341. a first pixel opening 342, a second pixel opening 343, a third pixel opening,
321. the light emitting device comprises a first hole injection layer, 322, a first hole transport layer, 323, a first light emitting layer, 324, a second light emitting layer, 325, a first electron transport layer, 326, a charge generation layer, 327, a second hole injection layer, 328, a second hole transport layer, 329, a third hole transport layer, 3210, a third light emitting layer, 3211, a hole blocking layer, 3212, a second electron transport layer, 3213 and a second electron injection layer.
Detailed Description
It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the embodiments of the disclosure, which are defined by the appended claims.
The backplane of a silicon-based OLED micro (micro OLED) display panel uses an integrated circuit to control the OLED light emitting devices, which greatly increases the resolution of the panel (usually up to 3000ppi or more). This also presents a significant challenge to OLED display devices: the traditional Fine Metal Mask (FMM) can achieve about 800PPI at most, which means that it is difficult to perform evaporation of organic layers such as light emitting layers in a Side by Side monochromatic device (SBS) manner for silicon-based OLED panels, and OLED pixels need to be separated by other means. These separation means include, but are not limited to, high separation pillars (TF), inter-pixel via (DOW), etc., which cannot be realized at the time of evaporation. Therefore, full-area evaporation of OLEDs is almost an inevitable choice in the field of silicon-based OLED microdisplays.
Because the SBS single RGB single color device can not be made like the OLED panel of mobile phone, the silicon-based OLED micro display can only adopt the white light device. Some silicon-based OLED micro-displays adopt a device structure with a single light-emitting layer to realize white light emission, a light-emitting layer framework adopts a combination of various different light-emitting materials to realize white light, the module brightness is generally 80 nits to 600 nits, the silicon-based OLED micro-displays belong to a display with medium and low brightness, if the single-layer structure is adopted to realize high brightness (more than 1000 nits), the power consumption and the service life are sacrificed, but the production bottleneck of the device is lower, and more companies with capacity of production are provided. In order to improve the efficiency, brightness and service life of the silicon-based OLED microdisplay, a stacked OLED device (tandem OLED) with more than two light emitting layers is introduced, a so-called Charge Generation Layer (CGL) is applied to connect two light emitting units in series, so that the effect of light emitting superposition is realized on the device, and important photoelectric properties such as current efficiency, output brightness, operation service life and the like can be successfully improved.
The white light device is matched with RGB (red, green and blue) colored glue (a colored filter layer) to realize full-color display, but the transmittance of the colored glue is only about 20% at present, and the transmittance of blue colored glue is usually less than 20%. There is a need to preferentially increase the efficiency of blue light in the fabrication of OLED devices. In addition, after a module is manufactured subsequently, when electrical property debugging is performed, Gamma (Gamma) debugging needs to be performed on the RGB pixels, 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 more current needs to be given to the relatively weak blue light, so that the load of the blue sub-pixels is increased when the module is used, the service life of the blue light is shorter than that of the red light and the green light, the overall service life of the module is influenced, components of the red light and the green light are increased when the module is used, a display picture is gradually yellowed, and the display effect is influenced.
As shown in fig. 1, fig. 1 is a schematic partial cross-sectional structure diagram of a display substrate of some technologies, 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 electrode 31 and the second electrode layer 33 form a light emitting device. The light emitting device in fig. 1 is a tandem light emitting device and emits white light, the light emitting functional layer 32 of the tandem light emitting device includes at least two light emitting units connected in series, 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 function layer 32 including the charge generation layer is usually subjected to full-area evaporation in the preparation process, however, since the lateral conductivity of the charge generation layer is relatively large, if the charge generation layer is continuous between adjacent sub-pixels, the pixel cross color problem is easily caused, in some technologies, an isolation groove structure 201 is arranged on an insulating layer of the driving structure layer 20, which is far away from the substrate 10, and the charge generation layer formed by subsequent full-area evaporation is disconnected at the isolation groove structure 201 by arranging the isolation groove structure 201, so that the pixel cross color problem is avoided. However, the arrangement of the isolation trench structure 201 causes the topography of the second electrode layer 33 to change, and the region of the second electrode layer 33 directly facing the isolation trench structure 201 and the region near the region are recessed to form a recessed region, such that the distance (such as distance b and distance c in fig. 1) between the first electrode 31 and the second electrode layer 33 is relatively short in the edge region of the pixel opening region near the isolation trench structure 201, and the distance (such as distance a in fig. 1) between the first electrode 31 and the second electrode layer 33 is relatively long in the middle region of the pixel opening region, which causes the resistance in the edge region of the pixel opening region to be smaller than that in 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 arranged closer to the second electrode layer 33 than the light emitting layer and the green light emitting layer, and thus the blue light is more easily influenced by the topography of the cathode than the red light and the green light, thus causing the blue emission to tend to be concentrated at the edges of the pixel.
In addition, some silicon-based OLED microdisplays set up miniature lens (micro-lens) at luminescent device's light-emitting side, can play the effect of gathering together light to increase the luminance of module positive visual angle. However, the micro anti-reflection mirror mainly gathers light rays in the central area of the pixel, the light rays at the edge of the pixel are poor in gathering capacity (are diffused), and blue light is mainly concentrated in the edge area of the pixel, so that the gain of the micro anti-reflection mirror to the blue light is smaller than that of red light and green light, a large amount of waste is caused to the weak blue light, the ratio of the blue light to the red light to the green light in the spectrum of the module is increased, and the brightness and the service life of the product are not as expected.
The present disclosure provides a display substrate, as shown in fig. 2 and 3, fig. 2 is a schematic partial cross-sectional structure of the display substrate according to some exemplary embodiments, and fig. 3 is a schematic pixel arrangement structure of the display substrate according to some exemplary embodiments, where the display substrate includes a plurality of pixel units P arranged on a substrate 10 in an array, and each pixel unit P includes a red sub-pixel R for emitting red light, a green sub-pixel G for emitting green light, and a blue sub-pixel B for 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 substrate 10; the light emitting structure layer comprises 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 comprises a plurality of first electrodes 31 arranged on the driving structure layer 20, the pixel defining layer 34 is arranged on one side of the plurality of first electrodes 31 far away from the substrate 10 and is provided with a first pixel opening 341 for defining the red sub-pixel R, a second pixel opening 342 for defining the green sub-pixel G and a third pixel opening 343 for defining the blue sub-pixel B, and each pixel opening exposes the surface of a corresponding one of the first electrodes 31 far away from the substrate 10; the second electrode layer 33 is disposed on the 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 form a light-emitting device; the lens layer includes a plurality of microlenses 71, and each microlens 71 is disposed on a light-emitting side of a corresponding one of the light-emitting devices.
Each sub-pixel comprises one light emitting device and one micro lens 71 arranged on the light emitting side of the light emitting device, the orthographic projection of the third pixel opening 343 on the substrate 10 is located in the middle area of the orthographic projection of the micro lens 71 of the blue sub-pixel on the substrate 10, and the orthographic projection area of the micro lens 71 of the blue sub-pixel on the substrate 10 is 1.5 times to 2 times of the orthographic projection area of the third pixel opening 343 on the substrate 10.
The display substrate of the embodiment of the disclosure defines that the orthographic projection of the third pixel opening 343 of the blue sub-pixel B on the substrate 10 is located in the middle area of the orthographic projection of the microlens 71 of the blue sub-pixel B on the substrate 10, and the orthographic projection area of the microlens 71 of the blue sub-pixel B on the substrate 10 is 1.5 times to 2 times of the orthographic 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 be gathered towards the front viewing angle direction of the display substrate after passing through the microlens 71, the light extraction efficiency of the blue light is improved, the load of the light emitting device of the blue sub-pixel B is reduced, the overall life of the display substrate is improved, and the display effect is improved. The display substrate of the disclosed embodiments may be adapted to a high resolution (PPI >2000) silicon-based OLED microdisplay.
In some exemplary embodiments, as shown in fig. 3, an orthographic projection of the first pixel opening 341 on the substrate 10 is located in a middle region of an orthographic projection of the microlens 71 of the red subpixel R on the substrate 10, and an area of the orthographic projection of the microlens 71 of the red subpixel R on the substrate 10 is 1.1 times to 1.2 times an area 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 area of the orthographic projection of the microlens 71 of the green sub-pixel G on the substrate 10 is 1.1 times to 1.2 times of the area of the orthographic projection of the second pixel opening 342 on the substrate 10.
In some exemplary embodiments, as shown in fig. 3, an area of an orthogonal projection of the third pixel opening 343 on the substrate 10 is smaller than an area of an orthogonal projection of the first pixel opening 341 on the substrate 10, and is smaller than an area of an orthogonal projection of the second pixel opening 342 on the substrate 10.
Exemplarily, the orthographic projection area of the first pixel opening 341 on the substrate 10 is S1, the orthographic projection area of the second pixel opening 342 on the substrate 10 is S2, and the orthographic projection area of the third pixel opening 343 on the substrate 10 is S3, then S1: s2: s3 may be 1.5:1.5: 1. The size and shape of the microlens 71 of the red subpixel R, the microlens 71 of the green subpixel G, and the microlens 71 of the blue subpixel B may be the same, and the area of the orthographic projection of the microlens 71 on the substrate 10 is S0, and S0 is 1.5 × S3 to 2 × S3. The micro-lenses 71 may be convex lenses, and the surface of the micro-lenses 71 facing away from the substrate 10 may be spherical. For example, 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 a circle, an ellipse, a rectangle, 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 that sub-pixel. The lens layer may be formed by a process of film formation, exposure, development, baking, or the like, or may be formed by a process of film formation, exposure, development, etching, or the like, using an inorganic material (e.g., a silicon oxide compound).
In some exemplary embodiments, as shown in fig. 3, each of the pixel units P may include one red subpixel R, one green subpixel G, and two blue subpixels B. In this embodiment, each pixel unit P is provided with one red subpixel R, one green subpixel G and two blue subpixels B, the light emitting area of the blue subpixels B can be increased, the aperture ratio of the blue subpixels B is increased, so as to increase the light emission of blue light, the proportion of blue light, red light and green light can be adjusted, and the light emission of RGB pixels is balanced, so that the current distribution among the RGB pixels is more balanced, and the load of the blue subpixels B is reduced.
In some exemplary embodiments, the two blue subpixels B in the pixel unit P are a first blue subpixel B and a second blue subpixel B, respectively, and the size of the third pixel opening 343 defining the first blue subpixel B and the third pixel opening 343 defining the second blue subpixel B are the same or different.
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 in size.
As shown in fig. 4, fig. 4 is a schematic view of a pixel arrangement structure of a display substrate according to another exemplary embodiment, and the size of the third pixel opening 343 defining the first blue sub-pixel B is different from the size of the third pixel opening 343 defining the second blue sub-pixel B. Therefore, the light-emitting areas of the two blue sub-pixels B in each pixel unit P are different, different currents can be supplied to the two blue sub-pixels B in the using process of a product, and the currents of the two blue sub-pixels B can be corrected and compensated through a circuit, so that the service life of the product is maximized.
In some exemplary embodiments, an area of an orthogonal projection of the first pixel opening on the substrate may be equal to or greater than an area of an orthogonal projection of the second pixel opening on the substrate.
Illustratively, as shown in fig. 3 and 4, an area of an orthogonal projection of the first pixel opening 341 on the substrate 10 is equal to an area of an orthogonal projection of the second pixel opening 342 on the substrate 10. In this example, the area of the orthographic projection of the microlens 71 of the red sub-pixel R on the substrate 10 and the area of the orthographic projection of the microlens 71 of the green sub-pixel G on the substrate 10 may be equal.
As shown in fig. 5, fig. 5 is a schematic view of a pixel arrangement structure of a display substrate according to still other exemplary embodiments, and an area of an orthogonal projection of the first pixel opening 341 on the substrate 10 may be larger than an area of an orthogonal projection of the second pixel opening 342 on the substrate 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. An area of an orthogonal projection of the microlens 71 of the red subpixel R on the substrate 10 may be 1.1 times to 1.2 times an area of an orthogonal projection of the first pixel opening 341 on the substrate 10. An area of an orthogonal projection of the microlens 71 of the green sub-pixel G on the substrate 10 may be 1.1 times to 1.2 times an area of an orthogonal projection of the second pixel opening 342 on the substrate 10. According to the embodiment, the ratio of the light-emitting areas of the red sub-pixel R and the green sub-pixel G is changed, so that the service life attenuation of the RGB sub-pixels is consistent, and the problem of color cast in the use process of a product is reduced.
In some exemplary embodiments, the light emitting device may be a tandem type light emitting device and configured to emit white light, the light emitting function layer includes a first light emitting layer, a second light emitting layer, an electric charge generating layer, and a third light emitting layer, which are sequentially stacked in a direction away from the substrate, the electric 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 an example of this embodiment, the first electrode is an anode, the second electrode layer is a cathode, the charge generation layer may include an N-type charge generation layer and a P-type charge generation layer sequentially stacked along a direction away from the first electrode, the N-type charge generation layer and the P-type charge generation layer are in direct contact and form an NP junction, the NP junction can simultaneously generate electrons and holes in the N-type charge generation layer and the P-type charge generation layer, the generated electrons may be transported to a side of the first electrode through the N-type charge generation layer, and the generated holes may be transported to a side of the second electrode layer through the P-type charge generation 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 an example of this embodiment, as shown in fig. 6, fig. 6 is a schematic diagram of a film structure of a light emitting device in a display substrate according to some exemplary embodiments, where 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, an electric 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, which are sequentially stacked along a direction away from the substrate; 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 whole-surface evaporation using an open mask.
In an example of this embodiment, as shown in fig. 2, the display substrate may further include an encapsulation structure layer 40 and a color filter layer 50 disposed on a side of the light emitting structure layer away from the substrate 10. The color filter layer 50 may be disposed on a surface of the encapsulation 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 planarization 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 planarization layer 60 away from the substrate 10, and the planarization layer 60 may make a 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 along 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 as to enable the red sub-pixel R to emit 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 blue filter unit is arranged on the light-emitting side of the light-emitting device of the blue sub-pixel B, so that the blue sub-pixel B emits blue light.
In some exemplary embodiments, as shown in fig. 2, the driving structure layer 20 includes an insulating layer far from the substrate 10, the insulating layer may be provided with an isolation groove structure 201 in a grid shape, the isolation groove structure 201 includes a plurality of grid cells, and each grid cell surrounds one first electrode 31; the charge generation layer is isolated 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 this 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 relatively long, even if the second electrode layer 33 is recessed at a 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 will not be greatly different at the pixel center region and the pixel edge region, and blue light extraction will not be affected.
In an example of this 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, and each pixel driving circuit 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.
An embodiment of the present disclosure further provides a display device, including the display substrate according to any one of the embodiments. The display device may be a near-to-eye display device, such as a head-mounted display, Augmented Reality (AR) glasses, Virtual Reality (VR) kiosk, 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, and a navigator.
In the drawings, the size of the constituent elements, the thickness of layers, or regions may be exaggerated for clarity. Therefore, the embodiments of the present disclosure are not necessarily limited to the dimensions, and the shape and size of each component in the drawings do not reflect a true scale. In addition, the drawings schematically show some examples, and embodiments of the present disclosure are not limited to the shapes or numerical values shown in the drawings.
In the description herein, "parallel" refers to a state where two straight lines form an angle of-10 ° or more and 10 ° or less, and thus includes a state where 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 therefore includes a state in which the angle is 85 ° or more and 95 ° or less.
In the description herein, the terms "upper", "lower", "left", "right", "top", "inner", "outer", "axial", "four corners", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of simplifying the description of the embodiments of the present disclosure, and do not indicate or imply that the structures referred to have a particular orientation, are constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present disclosure.
In the description herein, unless expressly stated or limited otherwise, the terms "connected," "fixedly connected," "mounted," or "coupled" are to be construed broadly and may, for example, be fixedly connected, or detachably connected, or integrally connected; the terms "mounted," "connected," and "fixedly connected" may be directly connected or indirectly connected through intervening elements, or may be connected through the interior of two elements. The meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.
Claims (10)
1. A display substrate, comprising: the pixel unit comprises a plurality of pixel units arranged on a substrate in an array mode, 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 substrate; the light emitting structure layer comprises a first electrode layer, a pixel defining layer, a light emitting function layer and a second electrode layer, the first electrode layer comprises a plurality of first electrodes arranged on the driving structure layer, the pixel defining layer is arranged on one side, away from the substrate, of the plurality of first electrodes and is provided with a first pixel opening for defining the red sub-pixel, a second pixel opening for defining the green sub-pixel and a third pixel opening for defining the blue sub-pixel, and each pixel opening exposes the surface, away from the substrate, of the corresponding first electrode; the second electrode layer is arranged on the side, far away from the substrate, of the light-emitting functional layer, and each first electrode, the second electrode layer and the light-emitting functional layer positioned 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.
2. The display substrate of claim 1, wherein: the orthographic projection of the first pixel opening on the substrate is located in the middle area of the orthographic projection of the microlens of the red sub-pixel on the substrate, and 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 of the area of the orthographic projection of the first pixel opening on the substrate;
and/or the orthographic projection of the second pixel opening on the substrate is positioned in the middle area of the orthographic projection of the microlens of the green sub-pixel on the substrate, and the area of the orthographic projection of the microlens 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. The display substrate of 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 respectively a first blue sub-pixel and a second blue sub-pixel, and the size of a third pixel opening for limiting the first blue sub-pixel is the same as or different from that of a third pixel opening for limiting the second blue sub-pixel.
6. The display substrate of 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 tandem type light-emitting device and is arranged to emit white light, the light-emitting function layer comprises a first light-emitting layer, a second light-emitting layer, an electric charge generation layer and a third light-emitting layer which are sequentially stacked along the direction far away from the substrate, the electric charge generation layer is arranged to generate holes and electrons under the voltage action of the first electrode and the second electrode layer, either one of the first light-emitting layer and the second light-emitting layer is a red light-emitting layer, the other one of the first light-emitting layer and the second light-emitting layer is a green light-emitting layer, and the third light-emitting layer is a blue light-emitting layer;
the display substrate is still including setting up keeping away from of light emitting structure layer the colored filter layer of basement one side, the colored filter layer includes a plurality of red filter unit, a plurality of green filter unit and a plurality of blue filter unit, every red filter unit sets up the light-emitting side of red sub-pixel's luminescent device, every green filter unit sets up the light-emitting side of green sub-pixel's luminescent device, every blue filter unit sets up the light-emitting side of blue sub-pixel's luminescent device.
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 latticed isolation groove structure, the isolation groove structure comprises a plurality of grid units, and each grid unit surrounds one first electrode; the charge generation layer is isolated by the isolation groove structure, and the distance between the third pixel opening and the isolation groove structure is greater than the distance between the first pixel opening and the isolation groove structure and greater than the distance between the second pixel opening and the isolation groove structure.
9. The display substrate of claim 8, wherein: the distance between the third pixel opening and the isolation groove structure is 1.8-2.2 μm, the distance between the first pixel opening and the isolation groove structure is 0.8-1.2 μm, and the distance between the second pixel opening and the isolation groove structure is 0.8-1.2 μm.
10. A display device, characterized in that: comprising a display substrate according to any one of claims 1 to 9.
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| WO2024060907A1 (en) * | 2022-09-23 | 2024-03-28 | 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 |
| WO2024113572A1 (en) * | 2022-11-29 | 2024-06-06 | Boe Technology Group Co., Ltd. | Display panel and display apparatus |
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