CN115171547B - Display substrate, driving method thereof and display device - Google Patents
Display substrate, driving method thereof and display device Download PDFInfo
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- CN115171547B CN115171547B CN202210530704.4A CN202210530704A CN115171547B CN 115171547 B CN115171547 B CN 115171547B CN 202210530704 A CN202210530704 A CN 202210530704A CN 115171547 B CN115171547 B CN 115171547B
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- 239000000758 substrate Substances 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000003086 colorant Substances 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 32
- 229910021389 graphene Inorganic materials 0.000 claims description 32
- 238000005259 measurement Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 11
- 239000002131 composite material Substances 0.000 claims description 8
- 239000010410 layer Substances 0.000 description 30
- 239000010408 film Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 229910052733 gallium Inorganic materials 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011787 zinc oxide Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
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- 239000003990 capacitor Substances 0.000 description 1
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- 238000005401 electroluminescence Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
- G09F9/335—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes being organic light emitting diodes [OLED]
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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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The application provides a display substrate, a driving method thereof and a display device. Each pixel unit comprises a plurality of organic light emitting sub-pixels capable of emitting light with different colors. Each color deviation adjusting unit is configured to emit light with different colors under different voltages. At least one color deviation adjusting unit is correspondingly arranged on each pixel unit. The color deviation adjusting units are positioned between adjacent organic light emitting sub-pixels in the corresponding pixel units. A plurality of color deviation adjusting units are arranged in the display substrate, and the color of light emitted by the color deviation adjusting units is adjusted by changing the voltage applied to the color deviation adjusting units, so that the color deviation phenomenon is improved or avoided by the color deviation adjusting units.
Description
Technical Field
The application relates to the technical field of display, in particular to a display substrate, a driving method thereof and a display device.
Background
With the wide use of electronic display products in daily life, users have put higher and higher demands on the display performance of electronic display products.
However, in the case of the current electronic display product with too long use time or change of refresh frequency, color shift occurs in the image displayed on the whole display substrate compared with the preset image, so that the displayed image is distorted, the contrast is reduced, and the user experience effect is reduced.
Disclosure of Invention
In view of the above, the present application provides a display substrate, a driving method thereof, and a display device, in which a plurality of color shift adjusting units are provided, and colors of light emitted from the color shift adjusting units are adjusted by changing a magnitude of a voltage applied to the color shift adjusting units, thereby improving or avoiding a color shift phenomenon using the color shift adjusting units.
The first aspect of the present application provides a display substrate including a plurality of pixel units and a plurality of color shift adjusting units. Each pixel unit comprises a plurality of organic light emitting sub-pixels capable of emitting light with different colors. Each color deviation adjusting unit is configured to emit light with different colors under different voltages. At least one color deviation adjusting unit is correspondingly arranged in each pixel unit. The color deviation adjusting units are positioned between adjacent organic light emitting sub-pixels in the corresponding pixel units.
In the scheme, the color of the light emitted by the color deviation adjusting unit is adjusted by changing the voltage applied to the color deviation adjusting unit, so that the color deviation adjusting unit is utilized to carry out color deviation compensation on the main color of the color deviation of the display substrate, and the color deviation phenomenon is further improved or avoided. In addition, the color deviation adjusting units are located between the adjacent organic light emitting sub-pixels in the corresponding pixel units, so that the arrangement of the plurality of color deviation adjusting units does not additionally increase the total thickness of the display substrate.
In a specific embodiment of the first aspect of the present application, the luminescent material of the color shift adjusting unit is partially reduced graphene oxide or a composite material containing partially reduced graphene oxide.
In a specific embodiment of the first aspect of the present application, the display substrate further comprises a monitoring unit and a control unit. And the monitoring unit is configured to monitor chromaticity when the image is displayed so as to obtain chromaticity measurement results corresponding to the plurality of organic light emitting sub-pixels. The control unit is connected with the monitoring unit and is configured to acquire chromaticity measurement results corresponding to the plurality of organic light emitting sub-pixels so as to adjust the voltage applied to the color deviation adjusting unit.
In a specific embodiment of the first aspect of the present application, the chromaticity measurement result is a measurement color coordinate, and the display substrate further includes a calculation unit. The calculating unit is used for calculating difference values between the measured color coordinates corresponding to the plurality of organic light emitting sub-pixels and the standard color coordinates corresponding to the measured color coordinates respectively, and calculating driving voltages required by the corresponding color deviation adjusting units when the difference values are not smaller than a preset value. The control unit is also used for performing voltage driving on the corresponding color deviation adjusting unit according to the driving voltage so as to perform color deviation compensation.
In a specific embodiment of the first aspect of the present application, each pixel unit is correspondingly provided with a plurality of color deviation adjusting units, and the color deviation adjusting units are in one-to-one correspondence with the organic light emitting sub-pixels in the pixel unit.
In a specific embodiment of the first aspect of the present application, the display substrate further includes an array substrate and a pixel defining layer. The array substrate includes a plurality of driving units divided into a plurality of first type driving units corresponding to the plurality of organic light emitting sub-pixels and a plurality of second type driving units corresponding to the plurality of color shift adjusting units. The pixel defining layer is positioned on one side of the array substrate and is configured to separate the light emitting area of the area where each organic light emitting sub-pixel is positioned from the light emitting area of the area where each color deviation adjusting unit is positioned. The plurality of color deviation adjusting units are arranged on the array substrate.
In a specific embodiment of the first aspect of the present application, the plurality of driving units include a gate electrode and a source electrode and the color deviation adjusting unit is electrically connected to the gate electrode in the corresponding second driving unit, and the gate electrode in the second driving unit applies different voltages to the corresponding color deviation adjusting unit to adjust the color of the light that can be emitted by the corresponding color deviation adjusting unit. Further, the color deviation adjusting units are electrically connected with the source and drain electrodes in the corresponding second type driving units, and the source and drain electrodes in the second type driving units apply different voltages to the corresponding color deviation adjusting units so as to adjust the brightness of the emergent light of the color deviation adjusting units.
In a specific embodiment of the first aspect of the present application, each organic light emitting sub-pixel at least includes an anode, an organic light emitting layer and a cathode, wherein the anode, the organic light emitting layer and the cathode are stacked, the cathode is disposed on a side of the pixel defining layer facing away from the array substrate, a plurality of through holes are disposed on the cathode and the pixel defining layer at positions corresponding to the plurality of color shift adjusting units, and a light emitting area of an area where the color shift adjusting unit is located at least partially overlaps with an area where the corresponding plurality of through holes are located.
A second aspect of the present application provides a display device comprising a display substrate in any of the embodiments of the first aspect.
A third aspect of the present application provides a driving method of a display substrate in any one of the embodiments of the first aspect, the driving method including adjusting a voltage applied to at least one of a plurality of color shift adjusting units in the display substrate to perform color shift compensation on the display substrate when the display substrate generates color shift. Each color deviation adjusting unit is configured to emit light with different colors under different voltages.
Drawings
Fig. 1 is a schematic plan view of a display substrate according to an embodiment of the application.
Fig. 2 is a schematic view of a partially enlarged planar structure in a display area of the display substrate shown in fig. 1.
Fig. 3 is a block diagram of a display substrate according to an embodiment of the application.
Fig. 4 is a block diagram of a display substrate according to another embodiment of the present application.
Fig. 5 is a partially enlarged cross-sectional view of the display area of the display substrate shown in fig. 1, taken along MM'.
Fig. 6 is a schematic partial enlarged cross-sectional view of the display area of the display substrate shown in fig. 1, taken along MM'.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The display substrate generally includes a plurality of pixel units, each including a plurality of organic light emitting sub-pixels that emit light of different colors. In this case, since the organic light emitting materials used for the plurality of organic light emitting sub-pixels are different, the degree of luminance decay of the plurality of organic light emitting sub-pixels is also different as the service time of the display substrate is prolonged. For example, it is assumed that the plurality of organic light emitting sub-pixels are a green sub-pixel G capable of emitting green light, a blue sub-pixel B capable of emitting blue light, and a red sub-pixel R capable of emitting red light, respectively, and when the display substrate displays white light, the luminance of the green light emitted from the green sub-pixel G: brightness of red light emitted from the red subpixel R: the brightness=69 of the blue light emitted from the blue subpixel B: 21:10. after the display substrate is used for a period of time, the ratio of the luminance decrease of the green sub-pixel G, the red sub-pixel R, and the blue sub-pixel B is different, so that the ratio of the luminance of the three sub-pixels is deviated from 69:21: and 10, the color cast phenomenon is easy to occur. In another case, the same display substrate generally displays different pictures at different refresh frequencies, and when the refresh frequencies are changed, color shift occurs due to different turn-on voltages (Von) and different equivalent capacitances of different sub-pixels, so that the proportion of the light emitting time corresponding to different organic light emitting sub-pixels is not balanced at different refresh frequencies. The display substrate before the improvement of the technical scheme of the application is called as an original display substrate in the following.
In view of the above, at least one embodiment of the present application provides a display substrate, a driving method thereof, and a display device, which can solve at least the above problems, wherein a plurality of color shift adjusting units are disposed in the display substrate, and the color of the light emitted from the color shift adjusting units is adjusted by changing the voltage applied to the color shift adjusting units, so that the color shift phenomenon of the original display substrate is improved or avoided by the color shift adjusting units.
Hereinafter, a display substrate, a driving method thereof, and a display device according to at least one embodiment of the present application will be described with reference to the accompanying drawings. In the drawings, a spatial rectangular coordinate system is established with reference to the substrate of the display substrate, in which the X-axis and the Y-axis are parallel to the plane of the display substrate and the Z-axis is perpendicular to the plane of the display substrate, to assist in explaining the positional relationship of each structure in the display substrate. In addition, in the embodiment of the present application, "thickness" is defined with reference to the substrate, for example, for an object located on one side of the substrate, the difference between the vertical distance from the end of the object farthest from the substrate to the substrate and the vertical distance from the end closest to the substrate is the thickness of the object.
Referring to fig. 1, the display substrate 100 has a display region 10 and a wiring region 20. The display area 10 is used for displaying images. The wiring region 20 is used for a signal line for applying a signal to the display region 10. The display substrate 100 may have a binding region, a bending region, or the like in addition to the display region 10 and the wiring region 20.
In the following, the plurality of organic light emitting sub-pixels are exemplified as the green sub-pixel G, the blue sub-pixel B, and the red sub-pixel R, and for example, the plurality of organic light emitting sub-pixels may further include one or more organic light emitting sub-pixels such as a yellow sub-pixel capable of emitting yellow light, a cyan sub-pixel capable of emitting cyan light, and a white sub-pixel capable of emitting white light. The arrangement pattern of the plurality of organic light emitting sub-pixels may be a staggered arrangement pattern as shown in fig. 1, or may be a pattern such as a non-staggered arrangement or a non-common Mask (Mask). The shape of the opening of the plurality of organic light emitting sub-pixels may be rectangular as shown in fig. 1, or may be designed in other shapes such as square. The opening shapes of the plurality of organic light emitting sub-pixels may have an area of the blue sub-pixel B, the red sub-pixel R, and the green sub-pixel G in this order from large to small as shown in fig. 1, or may be provided in other manners, for example, the area of the opening shape of the blue sub-pixel B is larger than the area of the opening shape of the red sub-pixel R and the area of the opening shape of the green sub-pixel G, and the area of the opening shape of the red sub-pixel R is equal to the area of the opening shape of the green sub-pixel G.
It should be noted that the display substrate 100 may be any one or a combination of a low temperature polysilicon (Low Temperature Poly-silicon, LTPS) substrate and an indium gallium zinc oxide (indium gallium zinc oxide, IGZO) substrate. For example, the display substrate 100 may include a substrate, a barrier layer, a buffer layer, a gate insulating layer, a capacitor insulating layer, an interlayer dielectric layer, a planarization layer, an encapsulation layer, and the like, and the specific film structure of the display substrate 100 may be selected according to actual needs.
In the display substrate provided in at least one embodiment of the present application, referring to fig. 1 to 6, the display substrate 100 includes a plurality of pixel units 110 and a plurality of color deviation adjusting units 120 within a display area 10. Each pixel unit 110 includes a plurality of organic light emitting sub-pixels 111 that can emit light of different colors. Each of the color deviation adjusting units 120 is configured to have a light that can emit different colors at different voltages. At least one color deviation adjusting unit 120 is disposed corresponding to each pixel unit 110. The color shift adjusting unit 120 is located between adjacent organic light emitting sub-pixels in the corresponding pixel unit. Therefore, when the color cast is generated on the display substrate, the color of the light emitted by the color cast adjusting unit can be adjusted by changing the voltage applied to the color cast adjusting unit, so that the color cast adjusting unit is utilized to compensate the main color of the color cast of the original display substrate, and the color cast problem can be further improved or avoided. In addition, the color deviation adjusting units are located between the adjacent organic light emitting sub-pixels in the corresponding pixel units, so that the arrangement of the plurality of color deviation adjusting units does not additionally increase the total thickness of the display substrate.
It should be noted that, in different pixel units, the positions and the number of the corresponding color shift adjusting units 120 may be the same or different. The display of the display substrate can be performed by a plurality of organic light emitting sub-pixels, so that the display substrate can normally display a picture. The color deviation adjusting unit 120 may be in a non-working state when the color deviation does not occur on the display substrate, for example, the color deviation adjusting unit 120 may be turned off to keep not emitting any color light, so as not to affect the normal display of the display substrate, while the color deviation adjusting unit 120 is in a working state when the color deviation occurs on the display substrate, for example, a certain voltage may be applied to the color deviation adjusting unit according to the actual requirement, so as to emit a specific color light, so as to play an auxiliary function of compensating the color deviation. The color of the light that can be emitted by the color shift adjusting unit 120 may be a single color or a mixed color of multiple colors, including but not limited to a single color corresponding to any one of the multiple organic light emitting sub-pixels, and a mixed color corresponding to any combination of the multiple organic light emitting sub-pixels.
In the display substrate provided by the embodiment of the application, the color deviation adjusting unit 120 may be any structural unit capable of emitting light with different colors under different voltages, and on the basis of this, the material of the color deviation adjusting unit 120 may be set according to the actual process, which is not limited herein. In the following, in several embodiments, the material of the color deviation adjusting unit 120 is explained.
In the display substrate provided in at least one embodiment of the present application, the light emitting material of the color shift adjusting unit 120 adopts partially reduced graphene oxide or a composite material containing partially reduced graphene oxide. In this way, the color deviation adjusting unit made of the material at least comprising the partially reduced graphene oxide can emit light with different colors when different voltages are applied, and the color of the light emitted by the color deviation adjusting unit 120 can be adjusted to any required color by utilizing the electroluminescence and color-adjustable characteristics of the partially reduced graphene oxide, so that the effect of color deviation compensation is achieved. In addition, the graphene has higher toughness and mechanical strength, so that the impact resistance of the display substrate can be improved.
It should be noted that, the partially reduced Graphene Oxide is a tunable Graphene at the interface between Graphene Oxide (GO) and reduced Graphene Oxide (reduced Graphene Oxide, rGO), and there are a series of discrete energy levels, when different voltages are applied, different colors of light can be emitted, and the emission wavelength of the different colors of light covers almost the entire visible spectrum, for example, the emission wavelength of the different colors of light is continuously tunable from 300nm to 1000 nm.
For example, in some embodiments, the partially reduced graphene oxide may be a semiconductor reduced graphene oxide. The fermi level of the semiconductor reduced graphene oxide can be adjusted due to the electric field generated by the voltage, so that the light emitting wavelength of the semiconductor reduced graphene oxide can be adjusted, and the color of the light emitted by the color cast adjusting unit 120 can be changed by adjusting the voltage.
For another example, in some embodiments, the partially reduced graphene oxide structure may be a composite structure comprising at least one graphene film and a graphene oxide film. Therefore, the graphene material in the composite structure is utilized to realize the adjustable and controllable luminous color of the color deviation adjusting unit.
For example, the composite structure may include a graphene film, a graphene quantum dot layer, and a graphene oxide film that are sequentially stacked, where the graphene/graphene oxide double-layer film may regulate the light emission color of the color shift adjusting unit by changing the voltage.
It should be noted that, the light-emitting material of the color deviation adjusting unit 120 includes, but is not limited to, partially reduced graphene oxide or a composite material containing partially reduced graphene oxide, so long as the color deviation adjusting unit can be color-adjustable under different voltages.
In the display substrate provided in at least one embodiment of the present application, referring to fig. 3, the display substrate 100 further includes a monitoring unit 130 and a control unit 140. The monitoring unit 130 is configured to monitor chromaticity when displaying an image, so as to obtain measurement results corresponding to the plurality of organic light emitting sub-pixels. The control unit 140 is connected to the monitoring unit 130 and configured to obtain chromaticity measurement results corresponding to the plurality of organic light emitting sub-pixels, so as to adjust the voltage applied to the color deviation adjusting unit 120. In this way, the monitoring unit 130 and the control unit 140 may obtain the chromaticity measurement results corresponding to the plurality of organic light emitting sub-pixels, so that the voltage applied to the color shift adjusting unit 120 may be determined in time according to the chromaticity measurement results corresponding to the plurality of organic light emitting sub-pixels, so that the light emitted after the voltage is applied to the color shift adjusting unit 120 may achieve the effect of color shift compensation, color shift phenomenon is avoided or improved, and user experience effect is further improved.
The image may be a preset image retrieved from the display substrate by the control unit 140, an image of the display substrate in a mode such as a screen, or an image displayed on the display substrate in real time or at a preset time interval. The chromaticity measurement result may be a measurement color coordinate, or may be a measurement electrical signal corresponding to the measurement color coordinate.
For example, in some embodiments, referring to fig. 4, if the measurement result is a measurement color coordinate, the display substrate 100 further includes a calculating unit 150. The calculating unit 150 is configured to calculate differences between measured color coordinates corresponding to the plurality of organic light emitting sub-pixels and standard color coordinates corresponding to the measured color coordinates, respectively, and calculate driving voltages required by the corresponding color shift adjusting units when the differences are not less than a preset value. The control unit 140 is further configured to perform voltage driving on the corresponding color shift adjusting unit according to the driving voltage, so as to perform color shift compensation. For example, the monitoring unit 130 may monitor the chromaticity when displaying the image, convert the chromaticity into an electrical signal, send the electrical signal to the calculating unit 150, calculate the measured color coordinates corresponding to the plurality of organic light emitting sub-pixels based on the electrical signal, compare the measured color coordinates corresponding to the plurality of organic light emitting sub-pixels with the standard color coordinates, and if the difference between the measured color coordinates and the standard color coordinates is greater than a preset value (for example, the preset value may be 0.005, etc.), the calculating unit 150 may determine the voltage applied to the corresponding color deviation adjusting unit according to the difference.
For another example, if the measurement result is a measurement electric signal, the control unit 140 may obtain the measurement electric signal from the monitoring unit 130, directly determine whether the color level meets the requirement based on the measurement electric signal, and send an indication signal for indicating whether the voltage needs to be applied, the magnitude of the applied voltage, and the like according to the meeting result.
In the following, the correspondence between the plurality of color deviation adjusting units and the pixel units provided in at least one embodiment of the present application is illustrated by several embodiments. The following description will exemplify a plurality of organic light emitting sub-pixels, which are a green sub-pixel G capable of emitting green light, a blue sub-pixel B capable of emitting blue light, and a red sub-pixel R capable of emitting red light, respectively.
In the display substrate provided in at least one embodiment of the present application, each pixel unit may be correspondingly provided with a plurality of color shift adjusting units. Further, the color shift adjusting units may be in one-to-one correspondence with the organic light emitting sub-pixels in the pixel unit.
For example, in some embodiments, the plurality of color deviation adjusting units may include any combination of a first color deviation adjusting unit corresponding to the green sub-pixel G, a second color deviation adjusting unit corresponding to the blue sub-pixel B, and a third color deviation adjusting unit corresponding to the red sub-pixel R. The first color deviation adjusting unit is used for emitting green light under a certain voltage when the green sub-pixel G generates color deviation of the display substrate due to brightness attenuation, refresh frequency change and the like, so as to play an auxiliary function of compensating the color deviation of the display substrate. The second color deviation adjusting unit is used for emitting blue light under a certain voltage when the blue sub-pixel B generates color deviation of the display substrate due to brightness attenuation, refresh frequency change and the like, so as to play an auxiliary function of compensating the color deviation of the display substrate. The third color deviation adjusting unit is used for emitting red light under a certain voltage when the red sub-pixel R generates color deviation of the display substrate due to brightness attenuation, refresh frequency change and the like, so as to play an auxiliary function of compensating the color deviation of the display substrate. In this way, the first color deviation adjusting unit can be used for performing chromaticity compensation on the green sub-pixel G, the second color deviation adjusting unit can be used for performing chromaticity compensation on the blue sub-pixel B, and the third color deviation adjusting unit can be used for performing chromaticity compensation on the red sub-pixel R.
For example, in other embodiments, the plurality of color shift adjusting units may include a first color shift adjusting unit corresponding to the green sub-pixel G and a fourth color shift adjusting unit corresponding to the blue sub-pixel B and the red sub-pixel R, where the fourth color shift adjusting unit is configured to emit light of a mixed color composed of blue and red at a certain voltage when the blue sub-pixel B and the red sub-pixel R generate color shift on the display substrate due to luminance degradation or refresh frequency variation, etc., so as to serve as an auxiliary function of compensating the color shift of the display substrate. In this way, the fourth color deviation adjusting unit is utilized to perform chromaticity compensation on the blue sub-pixel B and the red sub-pixel R, so that the variety and the number of the color deviation adjusting units can be effectively reduced.
The main color of the color shift may be blue, red, green, yellow, or the like.
In the display substrate provided in at least one embodiment of the present application, at least one of the color deviation adjusting units is a color deviation adjusting unit, that is, each pixel unit is correspondingly provided with a color deviation adjusting unit. For example, one color deviation adjusting unit may be, for example, a first color deviation adjusting unit, a second color deviation adjusting unit, or a third color deviation adjusting unit, and one color deviation adjusting unit may also emit light of a mixed color composed of any multiple colors, for example, a fourth color deviation adjusting unit, which is not particularly limited in the present application.
In the display substrate provided in at least one embodiment of the present application, referring to fig. 5 and 6, the display substrate 100 further includes an array substrate 160 and a pixel defining layer 170. The array substrate 160 includes a plurality of driving units 161, and the plurality of driving units 161 are divided into a plurality of first type driving units 1611 corresponding to the plurality of organic light emitting sub-pixels and a plurality of second type driving units 1612 corresponding to the plurality of color shift adjusting units. A pixel defining layer 170 disposed on one side of the array substrate 160 and configured to separate a light emitting region 1 of a region where each organic light emitting subpixel is disposed and a light emitting region 2 of a region where each color shift adjusting unit is disposed; the plurality of color deviation adjusting units 120 are disposed on the array substrate 160. In this way, each color shift adjusting unit 120 can independently apply voltage by using the corresponding second type driving unit, which is favorable for adjusting the color shift generated by each pixel unit in a finer granularity, and further, the display effect of the display substrate is better.
In the display substrate provided in at least one embodiment of the present application, the plurality of driving units 161 include a gate electrode and a source electrode. The color shift adjusting unit 120 is electrically connected to the gate of the corresponding second driving unit 1612. The gates of the second driving units 1612 apply different voltages to the corresponding color-shift adjusting units to adjust the colors of the light emitted by the corresponding color-shift adjusting units. In this way, the voltage applied to the corresponding color deviation adjusting unit by the grid electrode in the second type driving unit 1612 can be directly changed, so that the carrier doping concentration of the corresponding color deviation adjusting unit is regulated and controlled by the electrostatic electric field, the electrical adjustability of the color of the emergent light of the corresponding color deviation adjusting unit is realized, the luminescence wavelength is continuously adjustable from 300nm to 1000nm, and the color deviation compensation is realized by utilizing the color of the emergent light corresponding to the color deviation adjusting unit. In addition, since the second type driving unit is disposed in the array substrate 160, the structure of the display substrate is more compact.
For example, when the light-emitting material of the color deviation adjusting unit 120 includes at least one composite structure of graphene film and graphene oxide film. If the voltage applied to the corresponding color deviation adjusting unit by the grid electrode in the second driving unit 1612 is 0V, the corresponding color deviation adjusting unit can emit red light with the wavelength of about 550nm to 750nm, if the voltage applied to the corresponding color deviation adjusting unit by the grid electrode in the second driving unit 1612 is 30V, the corresponding color deviation adjusting unit can emit green light with the wavelength of about 500nm to 600nm, and if the voltage applied to the corresponding color deviation adjusting unit by the grid electrode in the second driving unit 1612 is 60V, the corresponding color deviation adjusting unit can emit blue light with the wavelength of about 450nm to 550 nm.
Further, in other embodiments, the color deviation adjusting unit 120 may be further electrically connected to the source/drain electrode of the corresponding second driving unit 1612, and the source/drain electrode of the second driving unit 1612 applies different voltages to the corresponding color deviation adjusting unit to adjust the brightness of the light that the corresponding color deviation adjusting unit can emit. Therefore, the brightness of the emergent light of the corresponding color deviation adjusting unit can be controlled by changing the voltage of the source and the drain, so that the chromaticity of the emergent light of the corresponding color deviation adjusting unit can be adjusted in a finer mode, and the color deviation of the original display substrate can be eliminated.
For example, when the light-emitting material of the color deviation adjusting unit 120 includes semiconductor reduced graphene oxide, the color deviation adjusting unit 120 can emit red light if the gate voltage is between 0V and 10V and the source-drain voltage is greater than the on voltage; when the gate voltage is between 20V and 30V and the source-drain voltage is greater than the on voltage, the color deviation adjusting unit 120 can emit green light; when the gate voltage is between 40V and 50V and the source-drain voltage is greater than the on voltage, the color shift adjusting unit 120 can emit blue light. In addition, the intensity of the light emitted by the corresponding color deviation adjusting unit 120 can be changed by changing the voltage of the source and the drain, so that the gray scale can be adjusted, and the chromaticity of the light emitted by the corresponding color deviation adjusting unit can be adjusted in a finer manner.
In the display substrate provided in at least one embodiment of the present application, each organic light emitting sub-pixel 111 at least includes an anode 1111, an organic light emitting layer 1112 and a cathode 1113 stacked together, the cathode 1113 is disposed on a side of the pixel defining layer 170 facing away from the array substrate 160, and a plurality of through holes K are disposed on the cathode 1113 and the pixel defining layer 170 at positions corresponding to the plurality of color shift adjusting units 120, and a light emitting area 2 of an area where the color shift adjusting units are located at least partially overlaps an area where the corresponding through holes K are located. Thus, the light emitted from the color shift adjusting unit is not completely blocked by the cathode 1113 and the pixel defining layer 170, and the more the overlapping areas are, the more the color shift compensation is facilitated to be fully performed by using the light emitted from the color shift adjusting unit.
The organic light-emitting layer 1112 may include a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, an electron blocking layer, and the like.
At least one embodiment of the present application also provides a display device, where the display device includes a display substrate in any one of the specific implementations of all the embodiments described above.
It should be noted that the display substrate may be any of the display substrates in any of the above embodiments, which are replaced or obviously modified. In addition, the display device may further include other structures such as an encapsulation layer for encapsulating the light emitting device, a light extraction layer for guiding out or straightening outgoing light corresponding to the plurality of organic light emitting sub-pixels, and other auxiliary optical films such as a polarizer, etc., according to actual needs. The display device may specifically include, but is not limited to, at least one electronic display product of a cell phone, tablet computer, electronic book reader, player, digital camera, laptop, car computer, desktop computer, set-top box, smart television, and wearable device.
Since the display device of the embodiment of the present application includes all the technical solutions of the embodiments shown in fig. 1 to 6, at least all the technical effects can be achieved, and the description thereof is omitted herein.
The present application also provides a driving method of a display substrate, including adjusting a voltage applied to at least one of a plurality of color shift adjusting units in the display substrate to perform color shift compensation on the display substrate when the display substrate generates color shift. Each color deviation adjusting unit is configured to emit light with different colors under different voltages.
It should be noted that, the display substrate may be the display substrate in any specific implementation manner in any of the above embodiments, or may be the display substrate in any of the above embodiments after the display substrate is replaced or obviously modified.
Since the driving method is a driving method corresponding to the display substrate of the embodiment shown in fig. 1 to 6, and includes all the technical solutions of the embodiment shown in fig. 1 to 6, the specific implementation of the driving method may refer to the description in the related embodiment of the display substrate, and at least all the technical effects can be achieved, which is not repeated herein. The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is to be construed as including any modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (11)
1. A display substrate, comprising:
a plurality of pixel units, each of which includes a plurality of organic light emitting sub-pixels emitting light of different colors; the pixel units are positioned on the pixel defining layer; and
a plurality of color deviation adjusting units, each configured to have different colors of light emitted under different voltages;
wherein, each pixel unit is correspondingly provided with at least one color deviation adjusting unit, and the color deviation adjusting units are positioned between adjacent organic light emitting sub-pixels in the corresponding pixel units; the pixel defining layer has through holes between the organic light emitting sub-pixels of each pixel unit, and the color shift adjusting unit is located in the through holes of the corresponding pixel unit.
2. The display substrate according to claim 1, wherein the light-emitting material of the color shift adjusting unit is partially reduced graphene oxide or a composite material containing the partially reduced graphene oxide.
3. The display substrate of claim 1, further comprising:
a monitoring unit configured to monitor chromaticity when an image is displayed, so as to obtain chromaticity measurement results corresponding to the plurality of organic light emitting sub-pixels;
and the control unit is connected with the monitoring unit and is configured to acquire chromaticity measurement results corresponding to the plurality of organic light emitting sub-pixels so as to adjust the voltage applied to the color deviation adjusting unit.
4. A display substrate according to claim 3, wherein the chromaticity measurements are measured color coordinates, the display substrate further comprising:
a calculating unit, configured to calculate differences between the measured color coordinates corresponding to the plurality of organic light emitting sub-pixels and standard color coordinates corresponding to the measured color coordinates, respectively, and calculate driving voltages required by the corresponding color shift adjusting units when the differences are not less than a preset value;
the control unit is further used for performing voltage driving on the corresponding color deviation adjusting unit according to the driving voltage so as to perform color deviation compensation.
5. The display substrate according to claim 1, wherein each of the pixel units is provided with a plurality of the color shift adjusting units, and the color shift adjusting units are in one-to-one correspondence with the organic light emitting sub-pixels in the pixel unit.
6. The display substrate according to any one of claims 1 to 5, further comprising:
an array substrate including a plurality of driving units divided into a plurality of first type driving units corresponding to the plurality of organic light emitting sub-pixels and a plurality of second type driving units corresponding to the plurality of color shift adjusting units;
a pixel defining layer, located at one side of the array substrate, configured to separate a light emitting region of a region where each of the organic light emitting sub-pixels is located from a light emitting region of a region where each of the color shift adjusting units is located;
the plurality of color deviation adjusting units are arranged on the array substrate.
7. The display substrate according to claim 6, wherein the plurality of driving units include a gate electrode and a source electrode, the color shift adjusting unit is electrically connected to the gate electrode in the corresponding second type of driving unit, and the gate electrode in the second type of driving unit applies different voltages to the corresponding color shift adjusting unit to adjust the color of the light that the color shift adjusting unit can emit.
8. The display substrate according to claim 6, wherein the plurality of driving units include a gate electrode and a source-drain electrode, the color-shift adjusting units are electrically connected to the source-drain electrodes in the corresponding driving units of the second type, and the source-drain electrodes in the driving units of the second type apply different voltages to the corresponding color-shift adjusting units to adjust brightness of light that can be emitted from the color-shift adjusting units.
9. The display substrate according to claim 6, wherein each of the organic light emitting sub-pixels comprises at least an anode, an organic light emitting layer, and a cathode which are stacked,
the cathode is arranged on one side of the pixel defining layer, which is away from the array substrate, and through holes are formed in the positions, corresponding to the color deviation adjusting units, of the cathode and the pixel defining layer, and the light-emitting area of the area where the color deviation adjusting units are located is at least partially overlapped with the area where the corresponding through holes are located.
10. A display device comprising the display substrate according to any one of claims 1 to 9.
11. A driving method of the display substrate according to any one of claims 1 to 9, comprising:
and adjusting the voltage of at least one of a plurality of color deviation adjusting units applied to the display substrate when the display substrate generates color deviation so as to perform color deviation compensation on the display substrate, wherein each color deviation adjusting unit is configured to have the function of emitting light with different colors under different voltages.
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