Color display device and color filter array substrate

Abstract

The present application provides a color display device and a color filter array substrate. The color display device comprises a substrate, a pixel structure, a color filter array and a display medium layer. The pixel structure is arranged on the substrate and comprises a plurality of sub-pixel structures. The color filter array is composed of a plurality of color materials with different colors and is arranged above the pixel structure and comprises a plurality of filter units, each of which corresponds to a sub-pixel structure. At least some of the filter units are composed of two color materials with different colors. The display medium layer is arranged on the pixel structure.

Description

Technical Field

[0001] This invention relates to a display device, and more particularly to a color display device and a color filter array substrate. Background Technology

[0002] With the advancement and widespread adoption of display technology, display devices are becoming increasingly focused on color reproduction. In display technology, to achieve a color display effect, a color filter layer is typically added between the display medium layer and the front light module. For example, using semiconductor photolithography processes, colored ink materials are attached to a glass substrate and then bonded to the display medium layer, or the colored ink materials are directly printed onto the display medium layer using a spraying method.

[0003] Among them, red, green, and blue (RGB for short) are commonly used colored inks. Figure 1 This refers to the transmission spectra of existing red, green, and blue ink materials at various wavelengths of visible light. Please refer to [reference needed]. Figure 1 When light passes through the original red ink R, only the red wavelength can pass through, and the same applies to the original green ink G and the original blue ink B. If the two colors of ink are overlapped in the light path, most of the visible light wavelength cannot pass through, resulting in an almost black color. This is the principle of subtractive color mixing. To achieve color mixing effects such as cyan, magenta, or yellow using RGB inks, the two colors of ink are arranged adjacently for light mixing. For example, if the original red ink R and the original green ink G are arranged adjacently, emitting red and green light respectively, and adjacent pixels are simultaneously turned on by a thin-film transistor (TFT), yellow light can be displayed. Similarly, green and blue light can be mixed to form cyan light, and red and blue light can be mixed to form magenta light. When red, green, and blue light are turned on simultaneously, they can be mixed to form white light.

[0004] However, in the current field, red, green, and blue inks with better optical or color rendering effects are often expensive, while cheaper materials often have unsatisfactory optical or color rendering effects, resulting in limited material choices and making it difficult to balance color display effects and manufacturing costs in production. In contrast, cyan, magenta, and yellow (CMY) inks offer a wider range of material choices and have a cost advantage. Summary of the Invention

[0005] This invention relates to a color display device and a color filter array substrate, which can increase the range of materials to be selected when manufacturing the color filter layer, and balance color display effect and manufacturing cost in production.

[0006] An embodiment of the present invention provides a color display device, including a substrate, a pixel structure, a color filter array, and a display medium layer. The pixel structure is disposed on the substrate and includes multiple sub-pixel structures. The color filter array is composed of multiple color materials of different colors and is disposed above the pixel structure, and includes multiple filter units, each filter unit corresponding to a sub-pixel structure. At least some of the filter units are composed of two of the different color materials. The display medium layer is disposed on the pixel structure. The different color materials include at least one of a first color material, a second color material, and a third color material. When the wavelength of visible light is the first wavelength, the transmittance of visible light in the first color material is 50%; when the wavelength of visible light is greater than 580 nm, the transmittance of visible light in the first color material is less than 10%; and the first wavelength is less than or equal to 530 nm.

[0007] One embodiment of the present invention provides a color filter array substrate, including a substrate and a color filter array. The color filter array is disposed on the substrate and is composed of multiple colored materials of different colors. The color filter array includes multiple filter units, at least some of which are composed of two of the different colored materials. The different colored materials include at least one of a first colored material, a second colored material, and a third colored material. When the wavelength of visible light is a first wavelength, the transmittance of visible light in the first colored material is 50%, wherein the first wavelength is less than or equal to 530 nm. When the wavelength of visible light is greater than 580 nm, the transmittance of visible light in the first colored material is less than 10%.

[0008] In the color display device and color filter array substrate of the embodiments of the present invention, since each filter unit corresponds to a sub-pixel structure, and at least some filter units are composed of two different colored materials, the selection of colored materials is not limited to a single red, green, and blue, but a combination of two materials can be selected to absorb incident light of different wavelengths. Moreover, due to the transmittance characteristics of the colored materials, the corresponding sub-pixel structure can be used to display an effect close to red, green, and blue. Therefore, the range of materials to be selected when manufacturing the color filter layer can be increased, and the color display effect and manufacturing cost can be balanced in production. Attached Figure Description

[0009] Figure 1 It is the transmission spectrum of existing red, green, and blue ink materials at various wavelengths of visible light;

[0010] Figure 2AThis is a cross-sectional schematic diagram of a color display device according to an embodiment of the present invention;

[0011] Figure 2B This is a cross-sectional schematic diagram of a color display device according to another embodiment of the present invention;

[0012] Figure 3 This is a cross-sectional schematic diagram of some components of a color display device according to another embodiment of the present invention;

[0013] Figure 4A It is the transmission spectrum of the color material of the color filter array of a color display device according to an embodiment of the present invention;

[0014] Figure 4B yes Figure 4A The transmission spectrum of the colored material after transmission spectrum calculation. Detailed Implementation

[0015] Reference will now be made in detail to exemplary embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same element references are used in the drawings and description to denote the same or similar parts.

[0016] Figure 2A This is a cross-sectional schematic diagram of a color display device 10 according to an embodiment of the present invention. Please refer to... Figure 2A The color display device 10 includes a substrate 110, a pixel structure 120, a color filter array 200, and a display medium layer 130. The pixel structure 120 is disposed on the substrate 110 and includes multiple sub-pixel structures 122, each of which may include a pixel electrode and switching elements (e.g., transistors) or other electronic components (e.g., capacitors). The substrate 110 is, for example, a glass substrate, a plastic substrate, a silicon substrate, a printed circuit board, a flexible substrate, or other suitable substrate. The color filter array 200 is composed of multiple color materials of different colors and is disposed above the pixel structure 120, and includes multiple filter units 202, each filter unit 202 corresponding to a sub-pixel structure 122. At least some of the filter units 202 are composed of two of the different color materials. For example, the different color materials may be three color materials. In this embodiment, the two color materials of the filter unit 202 composed of two of the different color materials are arranged in layers. This arrangement ensures that the intensity ratio of light passing through the two color materials is the same. For example, in... Figure 2AIn the design, the color filter unit 202 includes interleaved color filter units 202a, 202b, and 202c. Color filter unit 202a is composed of a lower cyan material and an upper magenta material. Therefore, when visible light spanning the visible light spectrum is incident on this color filter unit 202, the subtractive mixing principle of light causes the emitted light to appear blue. Color filter unit 202b is composed of a lower magenta material and an upper yellow material. Therefore, when visible light spanning the visible light spectrum is incident on this color filter unit 202, the subtractive mixing principle of light causes the emitted light to appear red. Color filter unit 202c is composed of a lower yellow material and an upper cyan material. Therefore, when visible light spanning the visible light spectrum is incident on this color filter unit 202, the subtractive mixing principle of light causes the emitted light to appear green. In one embodiment, the color filter array 200 may be disposed on a substrate to form a color filter array substrate, wherein this substrate is, for example, a transparent substrate.

[0017] The display medium layer 130 is disposed on the pixel structure 120. In this embodiment, the display medium layer 130 is an electrophoretic display material layer, therefore the color display device 10 is a reflective display device. However, in other embodiments, the display medium layer 130 may also be a liquid crystal layer, an organic light-emitting layer, an inorganic light-emitting layer, or other suitable display material layers. The color display device 10 may also provide a front light module above the color filter array 200 according to actual needs. The front light module may include, for example, a solid transparent optical adhesive, a light guide plate, a touch panel, a protective glass, etc.

[0018] Figure 2B This is a cross-sectional schematic diagram of a color display device 10 according to another embodiment of the present invention. Figure 2A The difference between this embodiment and the previous one is that, in this embodiment, the two colored materials in the filter unit 202, which is composed of two different colored materials, are randomly mixed and distributed, so that the incident light randomly collides within the filter unit 202 before exiting, resulting in a uniformly mixed color effect on a macroscopic scale. For example, in Figure 2B In this design, the filter unit 202 includes filter units 202a', 202b', and 202c' arranged in an alternating pattern. Filter unit 202a' is composed of a random mixture of yellow and magenta materials. Therefore, when visible light spanning the visible light spectrum is incident on this filter unit 202, the subtractive mixing principle of light causes the emitted light to appear red. Filter unit 202b' is composed of a random mixture of cyan and yellow materials. Therefore, when visible light spanning the visible light spectrum is incident on this filter unit 202, the subtractive mixing principle of light causes the emitted light to appear green. Filter unit 202c' is composed of a random mixture of magenta and cyan materials. Therefore, when visible light spanning the visible light spectrum is incident on this filter unit 202, the subtractive mixing principle of light causes the emitted light to appear blue.

[0019] Figure 3 This is a cross-sectional schematic diagram of some components of a color display device 10 according to another embodiment of the present invention. Please refer to... Figure 3 In this embodiment, the color filter array 200 is composed of a first filter layer 210 and a second filter layer 220 disposed above the first filter layer 210. The first filter layer 210 includes multiple first filter sub-regions 212, which are divided into groups of different colors (e.g., three groups: a group composed of first filter sub-regions 212a, a group composed of first filter sub-regions 212b, and a group composed of first filter sub-regions 212c). Each group of first filter sub-regions 212 is composed of one type of colored material. For example, first filter sub-region 212a may be composed of cyan material, first filter sub-region 212b may be composed of yellow material, and first filter sub-region 212c may be composed of magenta material. These different colored materials are disposed directly on the display medium layer 130, for example.

[0020] There is a first interval v1 between two adjacent first filter sub-regions 212 in the direction d in which the sub-pixel structures 122 are arranged. The first interval v1 corresponds to a sub-pixel structure 122 arranged in the direction d. That is, a sub-pixel structure 122 arranged in the direction d is exposed between two adjacent first filter sub-regions 212. For example, in this embodiment, the first filter sub-region 212 overlaps with the 4n-3, 4n-2, and 4n-1 sub-pixel structures 122 in the direction d, while the 4nth sub-pixel structure 122 does not overlap with the first filter sub-region 212.

[0021] The second filter layer 220 includes a plurality of second filter sub-regions 222, which are divided into multiple groups of different colors (e.g., three groups: a group composed of second filter sub-regions 222a, a group composed of second filter sub-regions 222b, and a group composed of second filter sub-regions 222c). The second filter sub-regions 222 belonging to each group are composed of one of the colored materials. For example, second filter sub-region 222a is composed of a yellow material, second filter sub-region 222b is composed of a magenta material, and second filter sub-region 222c is composed of a cyan material.

[0022] The second filter sub-region 222 partially overlaps with the first filter sub-region 212. Adjacent second filter sub-regions 222 have a second interval v2 in the direction d where the sub-pixel structures 122 are arranged. The second interval v2 corresponds to a sub-pixel structure 122 arranged in direction d and is offset from the first interval v1. In some embodiments, at least some filter units 202 are constituted by one of the first filter sub-region 212 or the second filter sub-region 222, and at least some filter units 202 are jointly constituted by the first filter sub-region 212 and the second filter sub-region 222. For example, in this embodiment, the second filter sub-region 222 overlaps with the 4n-3, 4n-1, and 4nth sub-pixel structures 122 in direction d, while the 4n-2nd sub-pixel structure 122 does not overlap with the second filter sub-region 222. In other words, the filter unit 202 corresponding to the 4n-2nd sub-pixel structure 122 is composed of the first filter sub-region 212, the filter unit 202 corresponding to the 4nth sub-pixel structure 122 is composed of the second filter sub-region 222, and the filter units 202 corresponding to the 4n-3rd and 4n-1st sub-pixel structures 122 are jointly composed of the first filter sub-region 212 and the second filter sub-region 222.

[0023] Specifically, in the above embodiment, taking the first to sixth sub-pixel structures 122 in direction d as an example, the filter unit 202 corresponding to the first sub-pixel structure 122 in direction d is composed of a first filter sub-region 212a made of cyan material and a second filter sub-region 222a made of yellow material. Therefore, when visible light spanning the visible light spectrum is incident on this filter unit 202, the subtractive mixing principle of light will cause the emitted light to appear green. Similarly, the filter units 202 corresponding to the third and fifth sub-pixel structures 122 in direction d will cause the emitted light to appear blue and red, respectively. In addition, since the filter units 202 corresponding to the second, fourth, and sixth sub-pixel structures 122 in direction d are composed of a single layer of first filter sub-region 212 or second filter sub-region 222, the colors presented are the colors of the colored materials constituting these regions, such as cyan, magenta, and yellow, respectively.

[0024] exist Figures 2A to 3In this embodiment, the color filter array 200 of the color display device 10 contains at least one of the following color materials with different colors: a first color material C, a second color material M, and a third color material Y. The characteristics of the first color material C, the second color material M, and the third color material Y are as follows: When the wavelength λ of visible light is the first wavelength λ1, the transmittance T of visible light in the first color material C is 50%; when the wavelength λ of visible light is greater than 580 nm, the transmittance T of visible light in the first color material C is less than 10%. When the wavelength λ of visible light is the second wavelength λ2 or the third wavelength λ3, the transmittance T of visible light in the second color material M is 50%; when the wavelength λ of visible light is between 510 nm and 580 nm, the transmittance T of visible light in the second color material M is less than 10%. When the wavelength λ of visible light is the fourth wavelength λ4, the transmittance T of visible light in the third color material Y is 50%; when the wavelength λ of visible light is less than 460 nm, the transmittance T of visible light in the third color material Y is less than 10%. Among them, the first wavelength λ1 is less than or equal to 530nm, the second wavelength λ2 is less than or equal to 490nm, the third wavelength λ3 is greater than or equal to 590nm, and the fourth wavelength λ4 is greater than or equal to 500nm.

[0025] Figure 4A This refers to the transmission spectrum of the color material of the color filter array 200 of a color display device 10 according to an embodiment of the present invention at various wavelengths λ of visible light. Please refer to... Figure 4A In this embodiment, the first wavelength λ1 is 522 nm, and when the wavelength λ of visible light is greater than 580 nm, the transmittance T of visible light in the first color material C is less than or equal to 4.3%. The second wavelength λ2 is 478 nm, the third wavelength λ3 is 598 nm, and when the wavelength λ of visible light is between 510 nm and 580 nm, the transmittance T of visible light in the second color material M is less than or equal to 9.1%. The fourth wavelength λ4 is 505 nm, and when the wavelength λ of visible light is less than 460 nm, the transmittance T of visible light in the third color material Y is less than or equal to 9.0%.

[0026] Therefore, the first color material C absorbs most of the light with wavelengths λ above 580nm (corresponding to the red light band in the spectrum) and allows light with wavelengths λ between 400nm and 580nm (corresponding to the blue and green light bands in the spectrum) to pass through. The second color material M absorbs most of the light with wavelengths λ between 510nm and 580nm (corresponding to the green light band in the spectrum) and allows light with wavelengths λ between 400nm and 510nm and between 580nm and 680nm (corresponding to the blue and red light bands in the spectrum) to pass through. The third color material Y absorbs most of the light with wavelengths λ below 460nm (corresponding to the blue light band in the spectrum) and allows light with wavelengths λ between 460nm and 680nm (corresponding to the green and red light bands in the spectrum) to pass through. Therefore, subtractive mixing of any two of the first color material C, the second color material M, and the third color material Y can well simulate RGB produced from the original materials, while white can be further created by mixing RGB.

[0027] For example, Figure 3 The first filter sub-regions 212a, 212b, and 212c can be composed of a first color material C, a third color material Y, and a second color material M, respectively. The second filter sub-regions 222a, 222b, and 222c can be composed of a third color material Y, a second color material M, and a first color material C, respectively. Taking the filter unit 202 corresponding to the first sub-pixel structure 122 in direction d as an example, when visible light is incident on this filter unit 202, the visible light passing through the third color material Y is absorbed by the first color material C in the 580-680nm wavelength range, and the remaining 460-580nm wavelength range can pass through, appearing as green.

[0028] Figure 4B yes Figure 4A The transmission spectrum of the colored material after transmission spectrum calculation. Please refer to... Figure 4A and Figure 4B The red transmission spectrum R' is Figure 4A The graph of the function obtained by multiplying and normalizing the transmission spectrum functions of the second color material M and the third color material Y corresponds to the transmission spectrum after the second color material M and the third color material Y are mixed or overlapped. The green transmission spectrum G' is Figure 4A The graph of the function obtained by multiplying and normalizing the transmission spectrum functions of the first color material C and the third color material Y corresponds to the transmission spectrum after the first color material C and the third color material Y are mixed or overlapped. The blue transmission spectrum B' is... Figure 4A The graph of the function obtained by multiplying and normalizing the transmission spectrum functions of the first color material C and the second color material M corresponds to the transmission spectrum after the first color material C and the second color material M are mixed or overlapped.

[0029] Compare Figure 1The transmission spectra of existing RGB ink materials at various wavelengths λ in the visible light spectrum are shown. Figure 4A The red transmission spectrum R', green transmission spectrum G', and blue transmission spectrum B' are shown. The red transmission spectrum R' shows a wavelength λ between approximately 590 nm and 600 nm at a transmittance T of 50%, which is larger than the wavelength λ (approximately 580 nm) of the original red ink R at a transmittance T of 50%. Furthermore, the original red ink R has a transmittance T of less than 5% at wavelengths λ less than 560 nm, while the red transmission spectrum R' shows a transmittance T of less than 10% at wavelengths λ less than 560 nm. Therefore, the mixture or overlap of the second color material M and the third color material Y exhibits better color performance, approaching that of the original red ink R. The green transmission spectrum G' shows a smaller full width at half maximum (FWHM) than the original green ink G, and its transmittance T is less than 10% at wavelengths above λ 580 nm. Therefore, the mixture or overlap of the first color material C and the third color material Y exhibits better color performance, approaching that of the original green ink G. The blue transmission spectrum B' shows a wavelength λ of approximately 480 nm at a transmittance T of 50%, which is smaller than the wavelength λ (approximately 520 nm) of the original blue ink B at a transmittance T of 50%. Furthermore, the original blue ink B has a transmittance T of less than 10% at wavelengths λ greater than 550 nm, while the blue transmission spectrum B' shows a transmittance T of less than 10% at wavelengths λ greater than 510 nm. Therefore, the first color material C, when mixed or overlapped with the second color material M, exhibits better color performance, closely resembling that of the original blue ink B.

[0030] In summary, in the color display device and color filter array substrate of the embodiments of the present invention, since each filter unit corresponds to a sub-pixel structure, and at least some filter units are composed of two different colored materials, the selection of colored materials is not limited to a single red, green, and blue, but can be a combination of two materials to absorb incident light of different wavelengths. Moreover, due to the transmittance characteristics of the colored materials, the corresponding sub-pixel structure can be used to display effects close to red, green, and blue. Therefore, the range of materials to be selected when manufacturing the color filter layer can be increased, and the color display effect and manufacturing cost can be balanced in production.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A color display device, characterized in that, include: substrate; A pixel structure, disposed on the substrate, includes multiple sub-pixel structures; A color filter array, composed of multiple colored materials of different colors, is disposed above the pixel structure and includes multiple filter units, each filter unit corresponding to a sub-pixel structure. At least some of the multiple filter units are composed of two of the multiple colored materials of different colors; and A display medium layer is disposed on the pixel structure. The plurality of colored materials with different colors include at least one of a first colored material, a second colored material, and a third colored material. When the wavelength of visible light is the first wavelength, the transmittance of visible light in the first colored material is 50%, wherein the first wavelength is less than or equal to 530 nm. When the wavelength of visible light is greater than 580 nm, the transmittance of visible light in the first colored material is less than 10%; When the wavelength of visible light is the second wavelength or the third wavelength, the transmittance of visible light in the second colored material is 50%, wherein the second wavelength is less than or equal to 490 nm and the third wavelength is greater than or equal to 590 nm; When the wavelength of visible light is between 510 nm and 580 nm, the transmittance of visible light in the second colored material is less than 10%. The first color material is cyan, and the second color material is magenta.

2. The color display device according to claim 1, characterized in that, When the wavelength of visible light is the fourth wavelength, the transmittance of visible light in the third color material is 50%, wherein the fourth wavelength is greater than or equal to 500 nm.

3. The color display device according to claim 2, characterized in that, When the wavelength of visible light is less than 460 nm, the transmittance of visible light in the third color material is less than 10%.

4. The color display device according to claim 1, characterized in that, The two colored materials in a filter unit, which is composed of two of the plurality of colored materials of different colors, are randomly mixed and distributed.

5. The color display device according to claim 1, characterized in that, A filter unit, composed of two of the plurality of colored materials of different colors, has the two colored materials arranged in an upper and lower layer.

6. The color display device according to claim 1, characterized in that, The color filter array comprises a first filter layer and a second filter layer disposed above the first filter layer. The first filter layer includes a plurality of first filter sub-regions, which are divided into multiple groups of different colors. Each group of the plurality of first filter sub-regions is composed of one of the plurality of colored materials. There is a first interval between two adjacent first filter sub-regions in the direction in which the plurality of sub-pixel structures are arranged. The first interval corresponds to a sub-pixel structure arranged in the direction. The second filter layer includes a plurality of second filter sub-regions, which are divided into multiple groups of different colors. Each group of the plurality of second filter sub-regions is composed of one of the plurality of colored materials. The plurality of second filter sub-regions partially overlap with the plurality of first filter sub-regions. There is a second interval between two adjacent second filter sub-regions in the direction in which the plurality of sub-pixel structures are arranged. The second interval corresponds to a sub-pixel structure arranged in the direction and is offset from the first interval.

7. The color display device according to claim 4, characterized in that, At least some of the filter units are composed of either a first filter sub-region or a second filter sub-region, and at least some of the filter units are composed of both a first filter sub-region and a second filter sub-region.

8. The color display device according to claim 1, characterized in that, The display medium layer is an electrophoretic display material layer.

9. A color filter array substrate, characterized in that, include: substrate; as well as A color filter array is disposed on the substrate and is composed of multiple colored materials of different colors. The color filter array includes multiple filter units, at least some of which are composed of two of the multiple colored materials of different colors. The multiple colored materials of different colors include at least one of a first colored material, a second colored material, and a third colored material. When the wavelength of visible light is a first wavelength, the transmittance of visible light in the first colored material is 50%. The first wavelength is less than or equal to 530 nm, and the first colored material is a cyan material. When the wavelength of visible light is greater than 580 nm, the transmittance of visible light in the first colored material is less than 10%; When the wavelength of visible light is the second wavelength or the third wavelength, the transmittance of visible light in the second colored material is 50%, wherein the second wavelength is less than or equal to 490 nm and the third wavelength is greater than or equal to 590 nm; When the wavelength of visible light is between 510 nm and 580 nm, the transmittance of visible light in the second colored material is less than 10%. The second color material is magenta.

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