CN112786671B

CN112786671B - WOLED display panel

Info

Publication number: CN112786671B
Application number: CN202110034277.6A
Authority: CN
Inventors: 万之君
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2021-01-12
Filing date: 2021-01-12
Publication date: 2022-11-08
Anticipated expiration: 2041-01-12
Also published as: CN112786671A

Abstract

A WOLED display panel is defined with a plurality of first sub-pixel areas, second sub-pixel areas, third sub-pixel areas and fourth sub-pixel areas, and comprises a first substrate, a light emitting layer arranged on the first substrate, a color resistance layer arranged on one side of a light emitting surface of the light emitting layer, and a plurality of electrochromic devices arranged on one side of the light emitting surface of the light emitting layer, wherein the light emitting layer comprises first sub-pixels positioned in the first sub-pixel areas, second sub-pixels positioned in the second sub-pixel areas, third sub-pixels positioned in the third sub-pixel areas, and fourth sub-pixels positioned in the fourth sub-pixel areas; the color resistance layer comprises a first color resistance, a second color resistance and a third color resistance which are in one-to-one correspondence with the first sub-pixel and the second sub-pixel; each electrochromic device corresponds to a fourth sub-pixel, and the electrochromic device automatically adjusts the electrochromic device to be in a transparent state or have a color state along with different pictures to be displayed in the fourth sub-pixel area.

Description

WOLED display panel

Technical Field

The invention relates to the technical field of display, in particular to a WOLED display panel.

Background

The conventional White Organic Light-Emitting Diode (WOLED) display device utilizes a WOLED + CF (Color Filter) mode to realize full Color display, and White sub-pixels can be retained to improve the brightness of the display. In the field of large-size screen display, technologies such as WOLED + CF and OPEN MASK (OPEN MASK) are generally adopted to manufacture OLED display devices.

For the display panel of WOLED + CF, each display pixel (pixel) thereof includes four sub-pixels, i.e., red (R), green (G), blue (B), and white (W) sub-pixels. Most of white light is reflected or absorbed when passing through the CF color resistor, and the light extraction efficiency is reduced by about 70% generally, so that the W sub-pixel is arranged, the corresponding CF has no color resistor, light is not required to be extracted through the color resistor, the light extraction efficiency can be improved, and the brightness of the display panel is improved.

WOLEDs are composite light emitting layers with multiple colors that each emit light of different colors, which are mixed together to form white light. Because the luminous efficiency of the luminous materials with different colors is different, the opening areas of the four sub-pixels in the WOLED are different, so that the light-emitting efficiency of the luminous material with lower luminous efficiency is improved. The panel resolution is affected due to the large difference between the maximum area and the minimum area of the sub-pixels with different colors, and the panel power consumption is increased by increasing the sub-pixel openings to improve the light extraction rate.

Therefore, the structure of the conventional WOLED display device needs to be improved.

Disclosure of Invention

Embodiments of the present invention provide a WOLED display panel, so as to solve the technical problems that in an existing WOLED display device, due to differences in opening areas of sub-pixels of different colors, the resolution of the panel is affected, and the light extraction rate is improved by increasing the opening areas of the sub-pixels, and the power consumption of the panel is also increased.

In order to solve the problems, the technical scheme provided by the invention is as follows:

the embodiment of the invention provides a WOLED display panel, which is defined with a plurality of first sub-pixel areas, second sub-pixel areas, third sub-pixel areas and fourth sub-pixel areas. The first substrate comprises a first thin film transistor array; the light emitting layer comprises a plurality of pixels, and each pixel comprises a first sub-pixel positioned in the first sub-pixel area, a second sub-pixel positioned in the second sub-pixel area, a third sub-pixel positioned in the third sub-pixel area, and a fourth sub-pixel positioned in the fourth sub-pixel area; the color resistance layer comprises a first color resistance, a second color resistance and a third color resistance which are in one-to-one correspondence with the first sub-pixel, the second sub-pixel and the third sub-pixel; each electrochromic device corresponds to each fourth sub-pixel; the electrochromic device automatically adjusts the electrochromic device to be in a transparent state or have a color state along with different pictures to be displayed in the fourth sub-pixel area.

In an embodiment of the present invention, when the fourth sub-pixel area needs to display white light, the electrochromic device is in a transparent state, and when the fourth sub-pixel area needs to display non-white light, the electrochromic device is in a color state that is the same as the color of light that the fourth sub-pixel area needs to emit.

In one embodiment of the present invention, the electrochromic device includes a first electrode, a second electrode, and an electrochromic layer disposed between the first electrode and the second electrode.

In one embodiment of the present invention, the electrochromic layer includes an electrochromic material layer and an electrolyte layer disposed in a stack.

In one embodiment of the present invention, the electrochromic layer is a resin film layer doped with electrochromic material and electrolyte salt.

In an embodiment of the invention, the WOLED display panel further includes a second substrate and a second thin film transistor array, the second substrate is disposed opposite to the first substrate, and the second thin film transistor array controls the electrochromic device to display different color states.

In one embodiment of the present invention, the color resistance layer and the electrochromic device are disposed on a side of the second substrate facing the light emitting layer.

In an embodiment of the invention, the second thin film transistor array is disposed on the second substrate.

In an embodiment of the invention, the WOLED display panel is a top emission display panel, the color resist layer is disposed on a side of the second substrate facing the light emitting layer, and the electroluminescent device is disposed on a side of the light emitting layer facing the color resist layer.

In an embodiment of the invention, the second thin film transistor array is disposed on the first substrate.

The beneficial effects of the invention are as follows: the electrochromic device corresponding to the fourth sub-pixel is additionally arranged, so that the white light emitted by the fourth sub-pixel can be used as a white light sub-pixel and can be converted into other sub-pixels with different light colors such as blue light or red light, the opening area of the blue sub-pixel or the red sub-pixel can be reduced, the light emitting efficiency of the WOLED display panel can be improved, the resolution of the WOLED display panel can be improved, the power consumption of the panel can be reduced, and the service life of the panel can be prolonged.

Drawings

Fig. 1 is a schematic structural diagram of a WOLED display panel according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a WOLED display panel according to another embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a WOLED display panel according to another embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated.

Referring to fig. 1, an embodiment of the invention provides a White Organic Light-Emitting Diode (WOLED) display panel 100, where the WOLED display panel 100 includes a first substrate 10, a Light-Emitting layer 20 disposed on the first substrate 10, and a color-resist layer 40 disposed on a Light-Emitting surface side of the Light-Emitting layer 20. A first thin film transistor array (not shown) is disposed on the first substrate to drive the light-emitting layer 20 to emit light. Since the light emitting layer 20 emits white light, in order to implement color display, a corresponding color resist layer 40 needs to be disposed on one side of the light emitting surface of the light emitting layer 20 to convert the white light of different sub-pixel regions into one of corresponding red, green, and blue light.

A plurality of first sub-pixel regions 101, second sub-pixel regions 102, third sub-pixel regions 103, and fourth sub-pixel regions 104 are defined on the WOLED display panel 100. Specifically, the first sub-pixel region 101, the second sub-pixel region 102, and the third sub-pixel region 103 are disposed adjacently and display light colors different from each other.

In one embodiment, the first sub-pixel region 101, the second sub-pixel region 102 and the third sub-pixel region 103 respectively display one of red, green and blue light.

The light emitting layer comprises a plurality of pixels, each pixel comprises a first sub-pixel 201, a second sub-pixel 202 and a third sub-pixel 203, the first sub-pixel 201 is located in the first sub-pixel area 101, the second sub-pixel 202 is located in the second sub-pixel area 102, and the third sub-pixel 203 is located in the third sub-pixel area 103.

The color resist layer 40 includes a first color resist 41, a second color resist 42, and a third color resist 43 corresponding to the first sub-pixel 201, the second sub-pixel 202, and the third sub-pixel one by one.

The colors of the first color resistor 41, the second color resistor 42 and the third color resistor 43 are different from each other.

In one embodiment, the first color resistor 41, the second color resistor 42 and the third color resistor 43 are each one of red, green and blue color resistors.

Specifically, for example, the first color resist 41 is a red color resist, the second color resist 42 is a green color resist, and the third color resist 43 is a blue color resist, but the invention is not limited thereto, and other combinations of color resists may be used.

Correspondingly, when white light emitted by different sub-pixels passes through the color resistance layer 40, the same color as the corresponding color resistance is displayed. That is, the first sub-pixel region 101 displays red light, the second sub-pixel region 102 displays green light, and the third sub-pixel region 103 displays blue light.

That is, the first sub-pixel 201 is a red sub-pixel, the second sub-pixel 202 is a green sub-pixel, and the third sub-pixel 203 is a blue sub-pixel.

In one embodiment, the color resist layer further includes a black matrix 44, and the black matrix 44 is disposed between adjacent color resists for preventing crosstalk between light beams emitted from adjacent sub-pixel regions, i.e. avoiding color mixing.

The color resistor is not disposed at a position corresponding to one side of the light emitting surface of the fourth sub-pixel 204, so that the fourth sub-pixel 204 can be a white sub-pixel, and the fourth sub-pixel region 104 can directly emit white light to improve the light emitting efficiency, thereby improving the display brightness of the image. WOLED display panels, however, are typically stacked OLED devices, the light-emitting layer 20 comprising a composite light-emitting material layer of multiple colors, typically a blue light-emitting material layer and a yellow light-emitting material layer stacked together to synthesize white light,

the light emitting layer 20 may include two stacked light emitting layers, that is, a blue light emitting material layer and a yellow light emitting material layer, and since the blue light emitting material has low light emitting efficiency and short lifetime, the opening area of the blue sub-pixel is designed to be larger than that of the red sub-pixel and the green sub-pixel, so as to improve the blue light emitting efficiency of the WOLED display panel 100.

The light emitting layer 20 may further include three stacked light emitting layers, that is, a blue light emitting material layer, a yellow light emitting material layer, and a blue light emitting material layer, which are sequentially stacked, and the light emitting efficiency of blue light is improved by adding one blue light emitting material layer, but this design may result in a weak light emitting efficiency of red light, and therefore the opening area of the red sub-pixel may be larger than that of the blue sub-pixel and the green sub-pixel.

No matter the design of two-fold luminescent layer or three-fold luminescent layer, the opening area of red, green and blue sub-pixels can be set differently, the design of increasing the opening area of the sub-pixels of some colors can be adopted, the difference between the opening area of the largest sub-pixel and the opening area of the smallest sub-pixel is larger, the resolution of the panel can be influenced, and the power consumption of the panel can be increased by increasing the opening of the sub-pixels to improve the light-emitting rate of corresponding colors. Therefore, the embodiment of the present invention improves the above problem, and the electrochromic device 50 is disposed at a corresponding position on the light emitting surface side of the fourth sub-pixel 204, and the electrochromic device 50 can automatically adjust its color to be in a transparent state or other states with colors such as red, blue, etc., and increase the display brightness or compensate the light emitting rate of the red sub-pixel or the green sub-pixel according to the requirement, so that the effect of increasing the light emitting rate can be achieved without increasing the opening area of the red sub-pixel or the opening area of the blue sub-pixel.

Specifically, the WOLED display panel includes a plurality of electrochromic devices 50, each electrochromic device 50 is disposed on one side of a light emitting surface of the light emitting layer 20, each electrochromic device 50 corresponds to the fourth sub-pixel 204, and after the white light emitted by the fourth sub-pixel 204 passes through the electrochromic device 50, the white light, the blue light, the red light, or other colored light is displayed.

The electrochromic device 50 can automatically adjust itself to be in a transparent state or other colored state according to different pictures to be displayed in the fourth sub-pixel region 104.

Specifically, when the fourth sub-pixel region 104 needs to display white light, the electrochromic device 50 is in a transparent state to enhance the brightness of the display screen; when the fourth sub-pixel region 104 needs to display non-white light, the electrochromic device 50 presents a color state that is the same as the color of light that the fourth sub-pixel region 104 needs to emit, so as to enhance the light-emitting rate of the corresponding color.

In one embodiment, the electrochromic device 50 includes a first electrode 51, a second electrode 54, and an electrochromic layer disposed between the first electrode 51 and the second electrode 54. Wherein the first electrode 51 is one of a positive electrode or a negative electrode, and the second electrode is the other one of the positive electrode and the negative electrode.

The electrochromic device 50 includes an organic electrochromic device and an inorganic electrochromic device according to the properties of electrochromic materials. The electrochromic material in the electrochromic layer generates electrochemical oxidation-reduction reaction under the action of the external electric field of the first electrode 51 and the second electrode 54, and the color of the material is changed through electron gain and loss.

The first electrode 51 and the second electrode 54 are made of transparent conductive materials, and may specifically be made of transparent indium tin oxide materials or indium zinc oxide materials.

In one embodiment, referring to fig. 1, the electrochromic layer includes an electrochromic material layer 52 and an electrolyte layer 53 disposed in a stacked manner.

The upper and lower positional relationship between the electrochromic material layer 52 and the electrolyte layer 53 is not limited, and the voltage applied thereto may be selected to be positive or negative according to the material color change characteristics of the electrochromic material layer 52.

The material of the electrochromic material layer 52 may be an inorganic material, and may also be an organic material. Specifically, the material of the electrochromic material layer 52 may be a metal oxide, a conductive organic small molecule, or a conductive polymer material. It will be appreciated that the choice of electrochromic material will vary from material to material depending on the desired color change, blue-to-clear color changeThe electrochromic material can be selected from tungsten oxide (WO) ₃ ) Or the PEDOT is PSS, the PEDOT is an aqueous solution of a conductive high molecular polymer, the PEDOT is a polymer of EDOT (3, 4-ethylene dioxythiophene monomer), and the PSS is polystyrene sulfonate.

The electrolyte layer 53 may be a solid electrolyte layer or a non-solid electrolyte layer. The electrolyte layer 53 includes a resin material and an electrolyte salt (or conductive particles).

The electrolyte layer 53 in this embodiment is a solid electrolyte layer, and is formed by doping an electrolyte salt or conductive particles with a PMMA resin as a matrix to form a solid, flexible, and conductive charge transport layer.

In one embodiment, the electrochromic layer may be directly a resin film layer doped with the electrochromic material and an electrolyte salt.

The WOLED display panel 100 further includes a second thin film transistor array (not shown) for controlling the electrochromic device 50 to display different color states.

Specifically, the second tft array applies a positive voltage signal or a negative voltage signal to the electrochromic device 50, so that the electrochromic device 50 reversibly changes between a transparent display and a blue (or red or other color) display, and thus the fourth sub-pixel 204 may finally appear as a white sub-pixel and a blue sub-pixel (or red or other color sub-pixel) according to the difference of the display frames of the WOLED display panel 100.

Specifically, the second thin film transistor array may be disposed on the first substrate 10, and may be disposed on the same layer as the first thin film transistor array. The second thin film transistor array can also be formed on a substrate separately.

The WOLED display panel 100 further includes a pixel defining layer 30, and a plurality of openings arranged in an array are formed on the pixel defining layer 30, and each opening defines one pixel.

The light emitting layer 20 includes an anode 21, a light emitting function layer 22, and a cathode 23 sequentially disposed on the first substrate 10.

In one embodiment, the light emitting function layer 22 includes a hole injection layer, a hole transport layer, a light emitting material layer, a charge generation layer, an electron transport layer, and an electron injection layer.

Each film layer of the light-emitting functional layer 22 provided by the invention can be evaporated through an open mask plate, so that the production cost is reduced. Specifically, the present embodiment may evaporate the hole injection layer, the hole transport layer, the light emitting material layer, the charge generation layer, the electron transport layer, and the electron injection layer through the same Common Mask (CMM).

The cathode 23 may also be formed by evaporation using the above-mentioned common mask, or by sputtering.

When the light emitting layer 20 is a two-layer light emitting layer, the light emitting material layer in the light emitting function layer 22 includes a blue light emitting material layer and a yellow light emitting material layer, and the light emitting efficiency of blue light is low in this design, so that the electrochromic material of the electrochromic device 50 may be a transparent-blue electrochromic material, so that the fourth sub-pixel 204 finally emits blue light, so as to enhance the light emitting rate of the blue sub-pixel. The second thin film transistor array controls the electrochromic device 50 to reversibly change between a transparent display and a blue display.

Since the fourth sub-pixel 204 can enhance the light extraction rate of blue light, the aperture area of the blue sub-pixel in the other three sub-pixels does not need to be increased, but the aperture area of the blue sub-pixel can be decreased. That is, when the third sub-pixel 203 is a blue sub-pixel, the opening area S3 of the third sub-pixel 203 may be smaller than the opening area S2 of the second sub-pixel 202 and the opening area S1 of the first sub-pixel 201, so that the light output of the WOLED display panel 100 may be improved, and the resolution and the panel power consumption may be reduced.

When the light emitting layer 20 is a three-layer light emitting layer, the light emitting material layer in the light emitting function layer 22 includes three layers of a blue light emitting material layer, a yellow light emitting material layer, and a blue light emitting material layer, which are stacked, in this design, the light emitting rate of blue light is enhanced, but the light emitting rate of red light is low, so that the electrochromic material of the electrochromic device 50 can be a transparent-red electrochromic material, so that the fourth sub-pixel 204 finally emits red light to enhance the light emitting rate of the red sub-pixel. The second thin film transistor array controls the electrochromic device 50 to reversibly change between a transparent display and a red display.

Since the fourth sub-pixel 204 can enhance the light extraction rate of red light, the opening area of the red sub-pixel in the other three sub-pixels does not need to be increased, but the opening area of the red sub-pixel can be decreased. When the third subpixel 203 is a blue subpixel and the first subpixel 201 is a red subpixel, the opening area S1 of the first subpixel 201 and the opening area S3 of the third subpixel 203 may both be smaller than the opening area S2 of the second subpixel 202, so that the light-emitting rate of the WOLED display panel 100 is improved, and the resolution thereof can be improved and the panel power consumption can be reduced.

The WOLED display panel 100 may be a top-emission display panel or a bottom-emission display panel, that is, the WOLED display panel 100 may emit light in a direction away from the first substrate 10 or may emit light through the first substrate 10.

Both the first substrate 10 and the second substrate 60 can adopt flexible substrates, so that the prepared WOLED display panel is a flexible display panel. Since the electrochromic device 50 itself has no limitation of flexibility or rigidity, there is no influence on the preparation of a flexible display panel.

In one embodiment, as shown in fig. 1, the WOLED display panel 100 is a top emission display panel, the WOLED display panel 100 further includes a second substrate 60, the second substrate 60 is disposed opposite to the first substrate 10, the color-resist layer 40 and the electrochromic device 50 are disposed on a side of the second substrate 60 facing the light-emitting layer 20, that is, the color-resist layer 40 and the electrochromic device 50 are prepared on the second substrate 60.

The second thin film transistor array may be disposed on the second substrate 60 to control a color displayed by the electrochromic device 50.

In one embodiment, the WOLED display panel further comprises a planarization layer 70, the planarization layer 70 covering the color-resist layer 40 and the electrochromic device 50.

Firstly, preparing a color resistance layer 40 on the second substrate 60, then preparing the electrochromic device 50 in a corresponding area, then preparing the planarization layer 70 covering the color resistance layer 40 and the electrochromic device 50, providing a flat surface for protection, and finally, attaching the second substrate 60 to the first substrate 10 with the light-emitting layer 20.

In one embodiment, as shown in fig. 2, unlike the embodiment shown in fig. 1, the electrochromic device 50 is disposed on the side of the light emitting layer 20 facing the color-resist layer 40, and the color-resist layer 40 is disposed on the side of the second substrate 60 facing the light emitting layer 20, that is, the electrochromic device 50 is prepared on the light emitting layer 20, and the color-resist layer 40 is prepared on the second substrate 60.

Specifically, an encapsulation layer 80 is disposed on the light emitting layer 20, and the electrochromic device 50 is disposed on the encapsulation layer 80.

The second thin film transistor array may be disposed on the first substrate 10, and the second thin film transistor array and the first thin film transistor array may be disposed on the same layer, which may save a manufacturing process.

The second substrate 60 having the color resist layer 40 is attached to the first substrate 10 having the electrochromic device 50.

In other embodiments, the color resist layer 40 can also be disposed directly on the light emitting layer 20. In particular, may be disposed on the encapsulation layer 80 in the same layer as the electrochromic device 50.

In one embodiment, as shown in fig. 3, the WOLED display panel is a bottom emission type display panel, and the color resist layer 40 and the electrochromic device 50 are disposed on the first substrate 10.

Specifically, the color resistance layer 40 and the electrochromic device 50 are both disposed between the light emitting layer 20 and the first substrate 10.

The second thin film transistor array and the first thin film transistor array are disposed on the same layer on the first substrate 10.

A planarization layer 70 is disposed on the color resist layer 40 and the electrochromic device 50, and the planarization layer 70 provides a flat substrate for preparing the light-emitting layer 20.

In one embodiment, the second substrate 60 is used as a cover plate covering the light emitting layer 20.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

The electrochromic device 50 corresponding to the fourth sub-pixel 204 is additionally arranged, so that the white light emitted by the fourth sub-pixel 204 can be used as a white light sub-pixel, and can be converted into other sub-pixels with different light colors, such as blue light or red light, for use, and therefore, the opening area of the blue sub-pixel or the red sub-pixel can be reduced, the light extraction efficiency of the WOLED display panel 100 can be improved, the resolution of the WOLED display panel 100 can be improved, the power consumption of the panel can be reduced, and the service life of the panel can be prolonged.

The WOLED display panel provided in the embodiment of the present invention is described in detail above, and the principle and the embodiment of the present invention are explained by applying specific examples herein, and the description of the above embodiment is only used to help understanding the technical solution and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A WOLED display panel having a plurality of first, second, third, and fourth sub-pixel regions defined thereon, the WOLED display panel comprising:

a first substrate including a first thin film transistor array;

a light emitting layer disposed on the first substrate, the light emitting layer including a plurality of pixels, each pixel including a first sub-pixel located in the first sub-pixel region, a second sub-pixel located in the second sub-pixel region, a third sub-pixel located in the third sub-pixel region, and a fourth sub-pixel located in the fourth sub-pixel region;

the color resistance layer is arranged on one side of the light-emitting surface of the light-emitting layer and comprises a first color resistance, a second color resistance and a third color resistance which are in one-to-one correspondence with the first sub-pixel, the second sub-pixel and the third sub-pixel; and

the plurality of electrochromic devices are arranged on one side of the light emitting surface of the light emitting layer and correspond to each fourth sub-pixel; wherein the content of the first and second substances,

the electrochromic device automatically adjusts the electrochromic device to be in a transparent state or a color state along with different pictures to be displayed in the fourth sub-pixel area, and the electrochromic device is in a red or blue state when in the color state;

the first sub-pixel is a red sub-pixel, the second sub-pixel is a green sub-pixel, the third sub-pixel is a blue sub-pixel, and the opening area of at least one of the first sub-pixel and the third sub-pixel is smaller than that of the second sub-pixel.

2. The WOLED display panel of claim 1, wherein when the fourth sub-pixel region is required to display white light, the electrochromic device is in a transparent state, and when the fourth sub-pixel region is required to display non-white light, the electrochromic device is in a color state that is the same as the color of light required to be emitted by the fourth sub-pixel region.

3. The WOLED display panel of claim 1, wherein the electrochromic device comprises a first electrode, a second electrode, and an electrochromic layer disposed between the first electrode and the second electrode.

4. The WOLED display panel of claim 3, wherein the electrochromic layer comprises a layer of electrochromic material and a layer of electrolyte arranged in a stack.

5. The WOLED display panel of claim 3, wherein the electrochromic layer is a resin film layer doped with an electrochromic material, an electrolyte salt.

6. The WOLED display panel of claim 1, further comprising a second substrate disposed opposite the first substrate and a second array of thin film transistors controlling the electrochromic device to assume different color states.

7. The WOLED display panel of claim 6, wherein the color-resist layer and the electrochromic device are disposed on a side of the second substrate facing the light-emitting layer.

8. The WOLED display panel of claim 7, wherein the second array of thin film transistors is disposed on the second substrate.

9. The WOLED display panel of claim 6, wherein the WOLED display panel is a top emission display panel, the color-resist layer is disposed on a side of the second substrate facing the light-emitting layer, and the electrochromic device is disposed on a side of the light-emitting layer facing the color-resist layer.

10. The WOLED display panel of claim 9, wherein the second thin film transistor array is disposed on the first substrate.