A color filter structure and pixel array switching control method thereof

Abstract

The present invention provides a color filter structure and a pixel array switching control method thereof. The color filter includes two types of pixels: switchable pixels and non-switchable pixels. The switchable pixels are, from bottom to top, a transparent substrate, a metal layer, a transparent conductive medium layer, a phase-change material layer, a transparent conductive medium layer, a phase-change material layer, a transparent conductive medium layer, and a metal layer, which together form a Fabry-Perot resonant cavity. The optical thickness of the Fabry-Perot resonant cavity can be changed by applying an electric pulse to cause the two layers of phase-change material to crystallize successively, thereby producing at least three different states: amorphous-amorphous, amorphous-crystalline, and crystalline-crystalline, so as to freely switch between at least three states of selective transmission of green, yellow, and global light. The pixel arrangement of the transmissive color filter provided by the present invention can be dynamically switched in situ between at least three pixel arrays of red, green, green, and blue; red, green, white, and blue; and red, yellow, yellow, and blue through electrical operation, and can be switched to the optimal pixel arrangement according to user needs.

Description

Technical Field

[0001] The present invention belongs to the field of color filtering, and more specifically, relates to a color filter structure and a pixel array switching control method thereof. Background Art

[0002] Color filters, as a crucial component of image sensors, provide color information. The image sensor's ability to reproduce color depends not only on the color purity and transmittance of the pixels in the filter but also on the arrangement of those pixels.

[0003] The common Bayer color filter is based on the three primary colors, with pixels arranged in red, green, blue, and red. It remains in use today for its accurate color accuracy. However, due to the loss of light entering the sensor, small-sized image sensors such as those in mobile phones suffer from color information waste and low signal-to-noise ratio, resulting in poor performance in low-light conditions. The recently developed red, green, white, and blue pixel arrangement improves the signal-to-noise ratio, but suffers from the problem of dull colors. The red, yellow, yellow, and blue pixel arrangement, while offering higher light intake and signal-to-noise ratio, performs well in low light conditions, but suffers from overexposure in brighter light.

[0004] Therefore, there is an urgent need for a color filter that can switch the pixel arrangement in situ according to the lighting conditions to meet the image sensor's efficient acquisition of color information under different light intensities. Summary of the Invention

[0005] In response to the defects of the existing technology, the purpose of the present invention is to provide a color filter structure and a pixel array switching control method thereof, aiming to solve the problem that the existing technology does not have a color filter that can switch the pixel arrangement in situ according to the lighting conditions, and cannot ensure that the image sensor can efficiently collect color information under different light intensities.

[0006] To achieve the above-mentioned object, in a first aspect, the present invention provides a color filter structure, comprising: a first pixel unit, a second pixel unit, a third pixel unit and a fourth pixel unit;

[0007] The first pixel unit is capable of selectively transmitting light of a first color;

[0008] The second pixel unit is capable of selectively transmitting light of a second color;

[0009] The third pixel unit is capable of selectively transmitting light of a third color;

[0010] The fourth pixel unit is capable of selectively transmitting light of a fourth color;

[0011] The second pixel unit and the third pixel unit have the same structure, and both include, from bottom to top, a first metal layer, a first transparent conductive medium layer, a first phase change material layer, a second transparent conductive medium layer, a second phase change material layer, a third transparent conductive medium layer, and a second metal layer; the first transparent conductive medium layer, the first phase change material layer, the second transparent conductive medium layer, the second phase change material layer, and the third transparent conductive medium layer serve as dielectric materials and form a Fabry-Perot resonant cavity with the first metal layer and the second metal layer; when the physical thickness of the Fabry-Perot resonant cavity of the second pixel unit and the third pixel unit is within a preset range, when the crystallization state of either the first phase change material layer or the second phase change material layer changes, the color of light transmitted by the pixel unit changes;

[0012] The pixel array corresponding to the light transmitted by the color filter structure includes light of the first color to light of the fourth color, wherein the color of the light transmitted by the second pixel unit and the third pixel unit can change with the change of the crystallization state of the phase change material inside them.

[0013] In an optional example, the visible light transmitted by the first pixel unit is red light, and the visible light transmitted by the fourth pixel unit is blue light;

[0014] Visible light transmitted through the second pixel unit and the third pixel unit can be switched between green light, yellow light and white light as the crystal state of the internal phase change material changes.

[0015] In an optional example, when the physical thickness of the Fabry-Perot resonant cavity of the second pixel unit or the third pixel unit is within a preset range, if the first phase change material layer and the second phase change material layer are both in an amorphous state, and at this time the optical thickness of the Fabry-Perot resonant cavity is not an integer multiple of any visible light wavelength, then the corresponding pixel unit transmits white light; if the first phase change material layer and the second phase change material layer are both in a crystalline state, and at this time the optical thickness of the Fabry-Perot resonant cavity is an integer multiple of the wavelength of yellow light, then the corresponding pixel unit transmits yellow light; if the first phase change material layer is in an amorphous state and the second phase change material layer is both in a crystalline state, and at this time the optical thickness of the Fabry-Perot resonant cavity is an integer multiple of the wavelength of green light, then the corresponding pixel unit transmits green light;

[0016] The color combination corresponding to the color filter structure pixel array can be dynamically switched between red, green, green, and blue, red, yellow, yellow, and blue, and red, green, white, and blue.

[0017] In an optional example, the first phase-change material layer and the second phase-change material layer are made of chalcogenide phase-change material.

[0018] In an optional example, the first to third transparent conductive medium layers are made of indium tin oxide or aluminum-doped zinc oxide material.

[0019] In an optional example, the thickness of the first phase-change material layer and the second phase-change material layer is in a range from 7 nm to 20 nm.

[0020] In an optional example, the thickness of the first to third transparent conductive medium layers is in a range of 50 nm to 300 nm.

[0021] In an optional example, a line connecting the centers of the first pixel unit and the fourth pixel unit is a first line, and a line connecting the centers of the second pixel unit and the third pixel unit is a second line; the first line and the second line are perpendicular.

[0022] In a second aspect, the present invention provides a pixel array switching control method for providing a color filter structure according to the first aspect, comprising the following steps:

[0023] Electric pulses of different intensities are applied to at least one of the second pixel unit and the third pixel unit to control the crystallization state of the two phase change material layers in the corresponding pixel unit and switch the color of the pixel array corresponding to the color filter structure.

[0024] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0025] The present invention provides a color filter structure and a pixel array switching control method thereof. The color filter includes two types of pixels: switchable pixels and non-switchable pixels. Both are multi-layer film structures and are arranged in a typical red, green, blue, and blue pattern. The non-switchable pixels are sequentially composed of a transparent substrate, a metal electrode layer, a transparent conductive medium layer, and a metal electrode layer, from bottom to top, and selectively transmit red and blue light, respectively. The switchable pixels are sequentially composed of a transparent substrate, a metal electrode layer, a transparent conductive medium layer, a chalcogenide phase change material layer, a transparent conductive medium layer, a chalcogenide phase change material layer, a transparent conductive medium layer, and a metal electrode layer, which together form a Fabry-Perot resonant cavity. Timed electric pulses can be used to sequentially crystallize the two layers of phase change material, thereby producing at least three different states: amorphous-amorphous, amorphous-crystalline, and crystalline-crystalline. This changes the optical thickness of the Fabry-Perot resonant cavity, allowing for free switching between at least three states of selective transmission of green, yellow, and global light. The pixel arrangement of the transmissive color filter provided by the present invention can be dynamically switched in situ between at least three pixel arrays of red, green, green, and blue, red, green, white, and blue, and red, yellow, yellow, and blue through electrical operation. It can switch to the optimal pixel arrangement based on the user's different requirements for image color purity, signal-to-noise ratio, and resolution, and meet different requirements for image quality in different environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the pixel arrangement and array structure of a transmissive color filter with dynamic three-way switching of pixel arrangement provided by an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the film structure of non-switchable pixels of a transmissive color filter with dynamic three-switch pixel arrangement provided by an embodiment of the present invention;

[0028] Figure 3 Schematic diagram of the film structure of switchable pixels of a transmissive color filter with dynamic three-switch pixel arrangement provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0030] It should be noted that, based on the principle of the Fabry-Perot resonant cavity, it only allows light of a specific wavelength whose wavelength is an integer multiple equal to the optical thickness of the resonant cavity (the product of the refractive index of the film and the physical thickness) to pass through, thereby having color selectivity. The pixel unit with switchable light transmission provided by the present invention can, in principle, selectively transmit at least four different colors of light (crystalline-crystalline, crystalline-amorphous, amorphous-crystalline, and amorphous-amorphous) as the crystal state of the two layers of phase change material changes. Under this premise, it is first necessary to control the thickness of each film layer under a suitable crystal state combination to construct a Fabry-Perot resonant cavity and be able to have one color selectivity, and the structure can have three color selectivities under the remaining three crystal state combinations.

[0031] It can be understood that, based on the analysis of the above principles, the switchable pixels provided by the present invention can theoretically achieve selective transmission of multiple colors, and can achieve the selection of the same light by different means through the selection of different phase change materials and the regulation of the thickness of each layer of film. Under the influence of the above principles, the present invention is intended to achieve selective transmission of a certain light and is not limited to one implementation method.

[0032] Therefore, for those skilled in the art, the solutions for selective transmission of multiple colors of light in pixel units achieved by specific technical means adopted under the support of the technical principles of the present invention should be included in the protection scope of the present invention.

[0033] Specifically, to vividly illustrate the present invention, the present invention uses the selective transmission of green, white, and yellow by a switchable pixel unit as an example. The above example should not be regarded as any substantial limitation on the technical solution protected by the present invention. Accordingly, the present invention provides a color filter with non-switchable pixels and switchable pixels, which can realize the switching of at least six pixel arrays, namely red-green-green-blue, red-green-white-blue, red-yellow-yellow-blue, red-yellow-white-blue, red-white-white-blue, and red-green-yellow-blue. The embodiments of the present invention use the first three commonly used pixel arrays as examples for illustration, and should not be regarded as any specific limitation on the scope of protection of the present invention.

[0034] The embodiments of the present invention are described below with reference to the accompanying drawings.

[0035] In response to the deficiencies in the prior art, the present invention aims to provide a transmissive color filter with dynamic three-way pixel arrangement switching. The pixel arrangement of this color filter can be dynamically switched in situ between red, green, green, and blue, red, yellow, yellow, and blue, and red, green, white, and blue through electrical operation. It can switch to the optimal pixel arrangement based on the user's different requirements for image color purity, signal-to-noise ratio, and resolution.

[0036] To achieve the above objectives, the present invention provides a transmissive color filter with a dynamic three-switchable pixel arrangement, comprising multiple color filter pixels. The red and blue filter pixels of the color filter are non-switchable, while the remaining pixels are switchable, capable of freely selecting to filter green, yellow, or global light. Each pixel of the color filter has a multilayer film structure. The switchable pixels, from bottom to top, comprise a transparent substrate, a first metal electrode layer, a first transparent conductive medium layer, a first chalcogenide phase change material layer, a second transparent conductive medium layer, a second chalcogenide phase change material layer, a third transparent conductive medium layer, and a second metal electrode layer. The non-switchable pixels, from bottom to top, comprise a transparent substrate, a first metal electrode layer, a first transparent conductive medium layer, and a first metal electrode layer.

[0037] Each color filter pixel is square, rotated 45° about its center, and arranged in rows and columns. The top transparent conductive dielectric layer of each switchable pixel is connected to a bit line BL, and the bottom transparent conductive dielectric layer is connected to a word line WL. Electric pulses of appropriate voltage and amplitude are applied to the switchable pixel via the word and bit lines, causing the two layers of phase change material in the switchable pixel unit to undergo a sequential phase transition, exhibiting three states: amorphous-to-amorphous, amorphous-to-crystalline, and crystalline-to-crystalline. These state transitions of the two layers of chalcogenide phase change material are used to adjust the selective filtering properties of the pixel unit.

[0038] The present invention provides a transmissive color filter with a dynamically three-switchable pixel arrangement. The filter comprises multiple color filter pixels. The non-switchable pixels utilize a metal electrode layer and a transparent conductive dielectric layer to form a Fabry-Perot resonant cavity. Adjusting the thickness of the transparent conductive dielectric layer produces red and blue pixels. The switchable pixels utilize a metal electrode layer, a transparent conductive dielectric layer, and two chalcogenide phase-change materials to form a Fabry-Perot resonant cavity. Adjusting the thickness and state of the transparent conductive dielectric layer and the two chalcogenide phase-change material layers produces the ability to selectively transmit green, yellow, and full-spectrum light.

[0039] In an embodiment, the chalcogenide phase change material is made of germanium telluride, antimony telluride, germanium antimony telluride, germanium antimony selenide telluride, antimony sulfur or antimony selenium alloy material, and the thickness of the chalcogenide phase change material layer is 7nm-20nm.

[0040] In an embodiment, the transparent conductive dielectric material is made of indium tin oxide or aluminum-doped zinc oxide, and the thickness of the transparent conductive dielectric layer is 50 nm-200 nm.

[0041] In an embodiment, the metal electrode material is made of silver, platinum or titanium, and the thickness of the metal electrode layer is 5nm-15nm.

[0042] In an embodiment, when the voltage of the electric pulse applied to the switchable pixel is 2V-5V and the pulse width is 200ns-400ns, the phase change material layer of the switchable pixel can be changed from an amorphous state to a crystalline state; when the voltage of the electric pulse applied to the switchable pixel is 6V-9V and the pulse width is 50ns-200ns, the phase change material layer of the switchable pixel can be changed from a crystalline state to an amorphous state.

[0043] In an embodiment, the thickness of the metal electrode layer of a non-switchable pixel is 5nm-15nm, the thickness of the transparent conductive medium layer is 50nm-300nm. The thickness of the metal electrode layer of a switchable pixel is 5nm-15nm, the thickness of the transparent conductive medium layer is 50nm-200nm, and the thickness of the phase change material layer is 7nm-20nm.

[0044] like Figure 1 As shown, the pixel arrangement of the transmissive color filter with dynamic three-switch pixel arrangement provided by the present invention is similar to the red, green, blue and blue pixel arrangement of the traditional Bayer color filter, but the difference is that the pixels of the present invention are divided into switchable pixels and non-switchable pixels. The non-switchable pixels are red and blue pixels, and the remaining pixels are switchable pixels that can switch between green, yellow and white.

[0045] In this embodiment, Figure 1As shown, each color filter pixel is a square rotated 45° about its center point and arranged in rows and columns. The top transparent conductive dielectric layer of each switchable pixel is connected to a bit line BL, and the bottom transparent conductive dielectric layer is connected to a word line WL. Electric pulses of appropriate voltage and amplitude are applied to the switchable pixel via the word and bit lines, causing the two layers of phase change material in the switchable pixel unit to undergo a phase transition, exhibiting three states: amorphous-to-amorphous, amorphous-to-crystalline, and crystalline-to-crystalline. These state transitions of the two layers of chalcogenide phase change material are used to adjust the selective filtering properties of the pixel unit.

[0046] In this embodiment, if Figure 2 As shown, the film layer structure of the non-switchable pixel is metal electrode layer / transparent conductive medium layer / metal electrode layer from bottom to top.

[0047] In this embodiment, if Figure 3 As shown, the film structure of the switchable pixel consists of, from bottom to top, a first metal electrode layer, a first transparent conductive dielectric layer, a first chalcogenide phase change material layer, a second transparent conductive dielectric layer, a second chalcogenide phase change material layer, a third transparent conductive dielectric layer, and a second metal electrode layer, forming a Fabry-Perot resonant cavity. The metal electrode layer, made of platinum, titanium, or silver, serves as a semi-transparent and semi-transmissive layer and electrode, electrically operating the switchable pixel. The transparent conductive dielectric layer, made of indium tin oxide or aluminum-doped zinc oxide, serves as both a dielectric and conductive layer. The chalcogenide phase change material layer is made of germanium telluride, antimony telluride, germanium antimony telluride, germanium antimony selenide telluride, antimony sulfur, or an antimony selenium alloy, enabling dynamic switching between different optical states.

[0048] Specifically, the principle of a transmissive color filter with a dynamic three-way pixel arrangement provided in this embodiment is to form a typical sandwich structure using two metal layers and a dielectric layer in between, forming a Fabry-Perot resonant cavity. Light of a certain wavelength can only be transmitted smoothly when the optical thickness of the resonant cavity (the product of the film's refractive index and its physical thickness) is an integer multiple of half the wavelength of the incident light, thereby exhibiting selective transmission of the incident light. The two layers of different phase change materials between the Fabry-Perot resonant cavity have different refractive indices before and after the phase change. This allows a single resonant cavity to have two or more resonant states without changing its physical thickness, thus achieving multiple color selectivity.

[0049] When a Fabry-Perot cavity has two layers of phase-change material, these two layers can have three different states: amorphous-amorphous, amorphous-crystalline, and crystalline-crystalline, with three different optical thicknesses. When the cavity is in the amorphous-amorphous state, the resonance of the cavity is very weak and lacks color selectivity, allowing it to transmit all light. When the cavity is in the amorphous-crystalline state, the optical thickness of the cavity is an integer multiple of the wavelength corresponding to green light, allowing it to selectively transmit green light. When the cavity is in the crystalline-crystalline state, the optical thickness of the cavity is an integer multiple of the wavelength corresponding to yellow light, allowing it to selectively transmit yellow light. Therefore, when all switchable pixels are in the amorphous-crystalline state, the pixel arrangement is red, green, green, and blue; when all switchable pixels are in the crystalline-crystalline state, the pixel arrangement is red, yellow, yellow, and blue; when half of the switchable pixels are in the crystalline-crystalline state and half of the switchable pixels are in the amorphous-crystalline state, the pixel arrangement is red, green, white, and blue.

[0050] Preferably, the thickness of the metal electrode layer of the transmissive color filter with dynamic three-switch pixel arrangement provided by this embodiment is 5nm-15nm, the thickness of the transparent conductive medium layer is 50nm-300nm, and the thickness of the phase change material layer is 7nm-20nm.

[0051] The present embodiment provides a transmissive color filter with dynamic three-way pixel arrangement switching, which enables the image sensor to switch in situ to a pixel arrangement with the best shooting effect under different ambient light conditions, and can be autonomously adjusted according to the usage environment.

[0052] The following describes in detail a transmissive color filter with dynamic three-switch pixel arrangement provided by the present invention in conjunction with specific embodiments.

[0053] Example 1

[0054] The transmissive color filter with dynamic three-switch pixel arrangement provided in this embodiment 1 has at least three pixel arrangements: red, green, green, and blue; red, green, white, and blue; and red, yellow, yellow, and blue. Pixels are divided into switchable pixels and non-switchable pixels.

[0055] The design method of the transmissive color filter with a dynamic three-switch pixel arrangement provided in this embodiment is as follows: (1) The red and blue pixels are non-switchable pixels, and the film layer structure is Ag / ITO / Ag from bottom to top, with the thickness of the Ag layer ranging from 7nm to 15nm, and the thickness of the ITO layer ranging from 50nm to 300nm. (2) The remaining pixels are switchable pixels, which can freely switch between selectively transmitting green, yellow, or full-range light. The film layer structure is Ag / ITO / PCM1 / ITO / PCM2 / ITO / Ag from bottom to top, with the thickness of the Ag layer ranging from 5nm to 15nm, and the thickness of the ITO layer ranging from 50nm to 200nm. Specifically, PCM1 and PCM2 refer to phase change material layers. In this embodiment, Ge2Sb2Te5 and Sb2S3 are used to prepare the corresponding phase change material layers, wherein the thickness of the Ge2Sb2Te5 and Sb2S3 layers are 7nm to 20nm.

[0056] The pixels in this embodiment are all square, rotated 45° about their center, and arranged in rows and columns. The top transparent conductive dielectric layer of each switchable pixel is connected to a bit line BL, while the bottom transparent conductive dielectric layer is connected to a word line WL. Electric pulses of appropriate voltage and amplitude are applied to the switchable pixels via the word and bit lines, causing the two layers of phase-change material in the switchable pixel cells to undergo sequential phase transitions, resulting in three states: amorphous-to-amorphous, amorphous-to-crystalline, and crystalline-to-crystalline.

[0057] Based on the above structure and design, the transmissive color filter with a dynamic three-way pixel arrangement provided in this embodiment exhibits selectivity for red and blue light in its non-switchable pixels, while its switchable pixels can freely switch between selectively transmitting green light, yellow light, and global light under the stimulation of an electrical pulse. Therefore, the transmissive color filter with a dynamic three-way pixel arrangement provided in this embodiment can achieve switching between at least three pixel arrangements: red-green-green-blue; red-green-white-blue; and red-yellow-yellow-blue.

[0058] It should be understood that expressions such as "include" and "may include" used in the present invention indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit one or more additional functions, operations, and constituent elements. In the present invention, terms such as "include" and / or "have" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components, or combinations thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or combinations thereof.

[0059] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A color filter structure, characterized in that: include: a first pixel unit, a second pixel unit, a third pixel unit, and a fourth pixel unit; The first pixel unit is capable of selectively transmitting light of a first color; The second pixel unit is capable of selectively transmitting light of a second color; The third pixel unit is capable of selectively transmitting light of a third color; The fourth pixel unit is capable of selectively transmitting light of a fourth color; The second pixel unit and the third pixel unit have the same structure, and both include, from bottom to top, a first metal layer, a first transparent conductive medium layer, a first phase change material layer, a second transparent conductive medium layer, a second phase change material layer, a third transparent conductive medium layer, and a second metal layer; the first transparent conductive medium layer, the first phase change material layer, the second transparent conductive medium layer, the second phase change material layer, and the third transparent conductive medium layer serve as dielectric materials and form a Fabry-Perot resonant cavity with the first metal layer and the second metal layer; when the physical thickness of the Fabry-Perot resonant cavity of the second pixel unit and the third pixel unit is within a preset range, when the crystallization state of either the first phase change material layer or the second phase change material layer changes, the color of light transmitted through the pixel unit where the phase change material layer with the changed crystallization state is located changes; The pixel array corresponding to the light transmitted by the color filter structure includes light of the first color to light of the fourth color, wherein the color of the light transmitted by the second pixel unit and the third pixel unit can change as the crystallization state of the phase change material inside the pixel unit changes; The visible light transmitted by the first pixel unit is red light, and the visible light transmitted by the fourth pixel unit is blue light; The visible light transmitted by the second pixel unit and the third pixel unit can be switched between green light, yellow light and white light according to the change of the crystal state of the internal phase change material; Among them, red and blue pixels are non-switchable pixels.

2. The color filter structure according to claim 1, wherein: When the physical thickness of the Fabry-Perot resonant cavity of the second pixel unit or the third pixel unit is within a preset range, if the first phase-change material layer and the second phase-change material layer are both in an amorphous state, and at this time the optical thickness of the Fabry-Perot resonant cavity is not an integer multiple of any visible light wavelength, then the corresponding pixel unit transmits white light; if the first phase-change material layer and the second phase-change material layer are both in a crystalline state, and at this time the optical thickness of the Fabry-Perot resonant cavity is an integer multiple of the wavelength of yellow light, then the corresponding pixel unit transmits yellow light; if the first phase-change material layer is in an amorphous state and the second phase-change material layer is both in a crystalline state, and at this time the optical thickness of the Fabry-Perot resonant cavity is an integer multiple of the wavelength of green light, then the corresponding pixel unit transmits green light; The color combination corresponding to the color filter structure pixel array can be dynamically switched between red, green, green, and blue, red, yellow, yellow, and blue, and red, green, white, and blue.

3. The color filter structure according to any one of claims 1 to 2, characterized in that: The first phase change material layer and the second phase change material layer are made of sulphur-based phase change material.

4. The color filter structure according to any one of claims 1 to 2, characterized in that: The first to third transparent conductive medium layers are made of indium tin oxide or aluminum-doped zinc oxide material.

5. The color filter structure according to any one of claims 1 to 2, characterized in that: The thickness of the first phase-change material layer and the second phase-change material layer is in the range of 7 nm to 20 nm.

6. The color filter structure according to any one of claims 1 to 2, characterized in that: The thickness of the first to third transparent conductive medium layers is in the range of 50 nm to 300 nm.

7. The color filter structure according to claim 1, wherein: A line connecting the centers of the first pixel unit and the fourth pixel unit is a first line, and a line connecting the centers of the second pixel unit and the third pixel unit is a second line; the first line and the second line are perpendicular.

8. A method for controlling pixel array switching of the color filter structure according to any one of claims 1 to 7, characterized in that: The following steps are involved: Electric pulses of different intensities are applied to at least one of the second pixel unit and the third pixel unit to control the crystallization state of the two phase change material layers in the corresponding pixel unit and switch the color of the pixel array corresponding to the color filter structure.

Images