CN112562525A - Display panel - Google Patents
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- CN112562525A CN112562525A CN202011443987.6A CN202011443987A CN112562525A CN 112562525 A CN112562525 A CN 112562525A CN 202011443987 A CN202011443987 A CN 202011443987A CN 112562525 A CN112562525 A CN 112562525A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 142
- 238000002955 isolation Methods 0.000 claims abstract description 44
- 239000000758 substrate Substances 0.000 claims abstract description 37
- 238000002834 transmittance Methods 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 description 13
- 239000003086 colorant Substances 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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Abstract
A display panel comprises a substrate, an isolation structure layer, a plurality of light emitting elements, a plurality of wavelength conversion patterns and a filter layer. The isolation structure layer is arranged on the substrate and is provided with a plurality of first grooves and a plurality of second grooves which are alternately arranged. The plurality of light emitting elements are respectively arranged in the first grooves. The plurality of wavelength conversion patterns are arranged in at least part of the plurality of first grooves and cover at least part of the plurality of light emitting elements. The filter layer covers the isolation structure layer and is filled into the second grooves.
Description
Technical Field
The present invention relates to a display technology, and more particularly, to a display panel.
Background
In recent years, in the case that the manufacturing cost of an Organic light-emitting diode (OLED) Display panel is high and the service life thereof cannot compete with that of a current mainstream Display, a Micro LED Display (Micro LED Display) has attracted the investment of each technology industry. In particular, the micro-led display has the advantages of low power consumption and long material life, in addition to optical performance equivalent to that of the organic led display, such as high color saturation, fast response speed and high contrast. Therefore, the display device is expected to become a mainstream display technology of the next generation.
In consideration of the yield of die transfer and the difficulty in miniaturizing the red light emitting diode, a miniature light emitting diode display employing a blue light emitting diode and a plurality of wavelength conversion materials is proposed. These wavelength converting materials are used to convert blue light emitted by a blue light emitting diode into red, green, or other colored light. However, when the absorption conversion efficiency of these wavelength conversion materials is insufficient, the blue light is easily spilled out, and the color gamut of the whole image is easily expressed.
Disclosure of Invention
The invention provides a display panel with better color expression.
The display panel comprises a substrate, an isolation structure layer, a plurality of light-emitting elements, a plurality of wavelength conversion patterns and a filter layer. The isolation structure layer is arranged on the substrate and is provided with a plurality of first grooves and a plurality of second grooves which are alternately arranged. The plurality of light emitting elements are respectively arranged in the first grooves. The plurality of wavelength conversion patterns are arranged in at least part of the plurality of first grooves and cover at least part of the plurality of light emitting elements. The filter layer covers the isolation structure layer and is filled into the second grooves.
In an embodiment of the invention, a ratio of transmittance of the filter layer of the display panel at wavelengths of 530nm and 628nm to transmittance of the filter layer at a wavelength of 480nm is greater than or equal to 2.
In an embodiment of the invention, the filter layer of the display panel covers the plurality of wavelength conversion patterns.
In an embodiment of the invention, the plurality of wavelength conversion patterns of the display panel include a first wavelength conversion pattern and a second wavelength conversion pattern. The conversion wavelength of the first wavelength conversion pattern is different from the conversion wavelength of the second wavelength conversion pattern, and a thickness of a portion of the filter layer covering the first wavelength conversion pattern is different from a thickness of another portion of the filter layer covering the second wavelength conversion pattern.
In an embodiment of the invention, a thickness of a portion of the filter layer of the display panel, which overlaps any of the wavelength conversion patterns, is greater than a thickness of another portion of the filter layer, which overlaps the isolation structure layer.
In an embodiment of the invention, a thickness of a portion of the display panel, where the filter layer overlaps any of the wavelength conversion patterns, decreases from a geometric center of the portion of the filter layer toward a direction away from the geometric center, and the geometric center of the portion of the filter layer overlaps a corresponding one of the light emitting devices.
In an embodiment of the invention, the display panel further includes a plurality of color filter patterns respectively overlapped with the plurality of wavelength conversion patterns, and the filter layer is located between the plurality of color filter patterns and the plurality of wavelength conversion patterns.
In an embodiment of the invention, the plurality of wavelength conversion patterns of the display panel include a first wavelength conversion pattern and a second wavelength conversion pattern which are arranged in a direction and adjacent to each other. The conversion wavelength of the first wavelength conversion pattern is different from the conversion wavelength of the second wavelength conversion pattern. The filter layer is located between the first wavelength conversion pattern and the second wavelength conversion pattern and filled in the corresponding second groove, and the part of the filter layer, which is located between the first wavelength conversion pattern and the second wavelength conversion pattern, has a first width in the direction. The first grooves and the first wavelength conversion patterns are arranged in the direction, and the adjacent one is not provided with the wavelength conversion patterns. The filter layer is located between the first wavelength conversion pattern and the first groove and filled in the other corresponding second groove, and the other part of the filter layer has a second width in the direction, and the second width is larger than the first width.
In an embodiment of the invention, the isolation structure layer of the display panel has a first surface and a second surface respectively defining the first groove and the second groove. A first included angle is formed between the first surface and the surface of the substrate. A second included angle is formed between the second surface and the surface of the substrate, and the second included angle is larger than the first included angle.
In an embodiment of the invention, the first included angle of the display panel is smaller than 70 degrees, and the second included angle is larger than 70 degrees and smaller than 90 degrees.
In an embodiment of the invention, the plurality of wavelength conversion patterns of the display panel include a first wavelength conversion pattern, a second wavelength conversion pattern and a third wavelength conversion pattern. The conversion wavelengths of the first wavelength conversion pattern and the second wavelength conversion pattern arranged in the first direction are different from each other. The conversion wavelengths of the first wavelength conversion pattern and the third wavelength conversion pattern arranged in the second direction are identical to each other. A portion of the filter layer between the first wavelength conversion pattern and the second wavelength conversion pattern has a first width in the first direction. The filter layer is located between the first wavelength conversion pattern and the third wavelength conversion pattern, and the other part of the filter layer has a second width in the second direction, and the first width is larger than the second width.
In an embodiment of the invention, the display panel further includes an auxiliary layer disposed on the substrate. The wavelength conversion patterns, the filter layer and the isolation structure layer cover the auxiliary layer.
In an embodiment of the invention, any one of the light emitting elements and the auxiliary layer of the display panel respectively have a first thickness and a second thickness in a normal direction of the substrate, and the first thickness is greater than the second thickness.
In an embodiment of the invention, the auxiliary layer of the display panel has a plurality of openings overlapping the plurality of first grooves, and the plurality of light emitting elements are respectively located in the openings of the auxiliary layer.
In an embodiment of the invention, the light emitting elements of the display panel are blue light emitting diodes.
Based on the above, in the display panel of an embodiment of the invention, the plurality of first grooves of the isolation structure layer are provided with the plurality of light emitting elements and define the plurality of pixel regions of the display panel, and the plurality of second grooves are further provided between the plurality of first grooves of the isolation structure layer. The filter layer covering the isolation structure layer and filled in the second grooves can effectively prevent part of light emitted by any light-emitting element from being emitted from the adjacent pixel regions after the wavelength conversion pattern in the same first groove and the isolation structure layer define the part of the first groove. In other words, light mixing caused by the generation of unexpected light emitting colors can be avoided, which is helpful for improving the color cast phenomenon of the display panel and improving the color gamut expression of the display panel.
Drawings
Fig. 1 is a schematic cross-sectional view of a display panel of a first embodiment of the present invention.
Fig. 2 is a schematic top view of the display panel of fig. 1.
Fig. 3 is a graph of wavelength versus transmittance of the filter layer of fig. 1.
Fig. 4 is a schematic cross-sectional view of a display panel of a second embodiment of the present invention.
Fig. 5 is a schematic cross-sectional view of a display panel of a third embodiment of the present invention.
Fig. 6 is a schematic cross-sectional view of a display panel of a fourth embodiment of the present invention.
Fig. 7 is a schematic cross-sectional view of a display panel of a fifth embodiment of the present invention.
Fig. 8 is a schematic cross-sectional view of a display panel of a sixth embodiment of the present invention.
Description of reference numerals:
10. 11, 12, 13, 14, 15: display panel
100: substrate
100 s: surface of
110. 110A, 110B: isolation structure layer
111: the first groove
111 s: first surface
112. 112a, 112b, 112 c: second groove
112 s: second surface
115: auxiliary layer
115 a: opening of the container
120. 121, 122, 123: light emitting element
130. 131, 132, 133, 134: wavelength conversion pattern
140. 140A, 140B, 140C, 140D: filter layer
141: first extension part
141a, 141a ", 141 b', 141 b", 141c, 141d, 141e1, 141e2, 141f1, 141f2, 142 a: in part
142: second extension part
150: optical pattern
200: color filter layer
210. 211, 212: color filter pattern
220: shading pattern
230: light-transmitting pattern
A1: first included angle
A2: second included angle
C. C': geometric center
PA: pixel region
T1, T2, T3, T4, T3 ', T4', Ta, Tb: thickness of
W1, W2, Wa, Wb': width of
X, Y, Z: direction of rotation
Detailed Description
As used herein, "about", "approximately", "essentially", or "substantially" includes the stated value and the average value within an acceptable range of deviation of the specified value as determined by one of ordinary skill in the art, taking into account the measurement in question and the specified amount of error associated with the measurement (i.e., the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within, for example, ± 30%, ± 20%, ± 15%, ± 10%, ± 5%. Further, as used herein, "about", "approximately", "essentially", or "substantially" may be selected with respect to measured properties, cutting properties, or other properties, to select a more acceptable range of deviation or standard deviation, and not to apply one standard deviation to all properties.
In the drawings, the thickness of layers, films, panels, regions, etc. have been exaggerated for clarity. It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to physical and/or electrical connections. Further, "electrically connected" may mean that there are other elements between the two elements.
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 reference numbers will be used throughout the drawings and the description to refer to the same or like parts.
Fig. 1 is a schematic cross-sectional view of a display panel of a first embodiment of the present invention. Fig. 2 is a schematic top view of the display panel of fig. 1. Fig. 3 is a graph of wavelength versus transmittance of the filter layer of fig. 1. Specifically, fig. 2 omits illustration of the substrate 100 of fig. 1 for clarity of presentation.
Referring to fig. 1 and fig. 2, the display panel 10 includes a substrate 100, an isolation structure layer 110, and a plurality of light emitting elements 120. The substrate 100 has a surface 100s, and the isolation structure layer 110 is disposed on the surface 100s of the substrate 100. The isolation structure layer 110 has a plurality of first grooves 111, and the light emitting elements 120 are respectively disposed in the first grooves 111. The first grooves 111 are arranged in rows and columns in the directions X and Y, respectively, and define a plurality of pixel areas PA, and the display panel 10 can generate light beams of various colors, such as red light, blue light, and green light, in the pixel areas PA, so as to achieve the display effect of color images.
It should be noted that, in the present embodiment, the number of the light emitting elements 120 located in the same first groove 111 (or the pixel area PA) is exemplarily illustrated by two, which does not mean that the present invention is limited thereto. In other embodiments, the number of the light emitting elements 120 in the same first groove 111 (or the pixel area PA) can be adjusted to one or more than three according to the actual application requirement. On the other hand, the light emitting element 120 may be a micro-LED (micro-LED) or a sub-millimeter LED (mini-LED). The material of the substrate 100 may include glass, quartz, or polymer material (e.g., polyimide). The material of the isolation structure layer 110 may include a photoresist material or a material containing titanium dioxide (TiO)2) The photoresist material of (1).
In this embodiment, the light emitting elements 120 may all be blue light emitting diodes, and therefore, the display panel 10 further includes a plurality of wavelength conversion patterns 130, and the wavelength conversion patterns 130 are disposed in at least a portion of the first grooves 111 and cover the corresponding light emitting elements 120. More specifically, the wavelength conversion pattern 130 may be used to convert light (e.g., blue light) emitted by the light emitting element 120 (e.g., a blue light emitting diode) into red light, green light, or other suitable color light.
In the present embodiment, the light emitting elements 121, 122 and 123 are respectively disposed in three first grooves 111 arranged along the direction X and adjacent to each other. The two first grooves 111 with the light emitting elements 121 and 122 are further respectively provided with wavelength conversion patterns 131 and 132. For example, in the present embodiment, the wavelength conversion pattern 131 is suitable for converting blue light emitted by the light emitting element 121 into green light, and the wavelength conversion pattern 132 is suitable for converting blue light emitted by the light emitting element 122 into red light, but not limited thereto. That is, the conversion wavelength of the wavelength conversion pattern 131 is different from the conversion wavelength of the wavelength conversion pattern 132.
On the other hand, two wavelength conversion patterns 130, such as the wavelength conversion pattern 131 and the wavelength conversion pattern 133 (or the wavelength conversion pattern 132 and the wavelength conversion pattern 134), which are arranged in two first grooves 111 arranged along the direction Y and adjacent to each other, have the same conversion wavelength. That is, the display panel 10 exhibits the same color of emitted light in the plurality of pixel regions PA arranged along the direction Y. However, the present invention is not limited thereto, and according to other embodiments, the plurality of pixel areas PA for displaying different light-emitting colors of the display panel may be arranged along the direction Y, and the plurality of pixel areas PA for displaying the same light-emitting color may be arranged along the direction X.
Further, in order to block a portion of light emitted from any of the light emitting devices 120 from being emitted from the adjacent pixel area PA through the isolation structure layer 110, the display panel 10 further includes a filter layer 140 covering the isolation structure layer 110. Specifically, the isolation structure layer 110 further includes a plurality of second grooves 112, and the filter layer 140 fills the second grooves 112. The second grooves 112 and the first grooves 111 are alternately arranged in the direction X and the direction Y, respectively. Referring to fig. 3, a ratio of transmittance of the filter layer 140 at 530nm and 628nm to transmittance of the filter layer 140 at 480nm is greater than or equal to 2. That is, the filter layer 140 is suitable for absorbing blue light and ultraviolet light.
In the present embodiment, the plurality of second grooves 112 are a plurality of second grooves 112a and a plurality of second grooves 112b, respectively, the second grooves 112a are arranged along the direction X and extend in the direction Y, and the second grooves 112b are arranged along the direction Y and extend in the direction X. That is, the second grooves 112a and the second grooves 112b are connected to each other, and the vertical projection of the occupied area on the substrate 100 is in a grid shape. Therefore, the filter layer 140 has a plurality of first extending portions 141 and a plurality of second extending portions 142, the first extending portions 141 are arranged along the direction X and extend in the direction Y, and the second extending portions 142. More specifically, the first extending portions 141 of the filter layer 140 respectively overlap the second grooves 112a of the isolation structure layer 110 in a direction (e.g., the direction Z) perpendicular to the surface 100s of the substrate 100, and the second extending portions 142 of the filter layer 140 respectively overlap the second grooves 112b of the isolation structure layer 110 in a direction perpendicular to the surface 100s of the substrate 100. On the other hand, in the embodiment, the filter layer 140 does not overlap the plurality of wavelength conversion patterns 130 in a direction perpendicular to the surface 100s of the substrate 100, but the invention is not limited thereto.
It is noted that, in the present embodiment, a portion 141a of the first extending portion 141 of the filter layer 140 filling the second groove 112a has a width W1 in the direction X, a portion 142a of the second extending portion 142 of the filter layer 140 filling the second groove 112b has a width W2 in the direction Y, and the width W1 is greater than the width W2. From another point of view, since the pixel areas PA for displaying different colors of the display panel 10 of the present embodiment are arranged along the direction X, the above-mentioned relationship of width can avoid light mixing caused by the generation of unexpected light-emitting colors, which is helpful for improving the color shift phenomenon of the display panel 10 and improving the color gamut performance thereof.
In the present embodiment, since the wavelength conversion pattern 130 is not disposed in the first groove 111 provided with the light emitting element 123, the display panel 10 may further optionally include an optical pattern 150 covering the light emitting element 123 to increase the light energy utilization rate of the light emitting element 123. For example, the material of the optical pattern 150 may be a transparent resin with a high refractive index, but not limited thereto. In other embodiments, the light emitted by the light emitting element 120 is ultraviolet light, for example, and the optical pattern 150 may be a wavelength conversion pattern for converting ultraviolet light into blue light.
The present disclosure will be described in detail below with reference to other embodiments, wherein like components are denoted by like reference numerals, and descriptions of the same technical content are omitted, and reference is made to the foregoing embodiments for omitting details.
Fig. 4 is a schematic cross-sectional view of a display panel of a second embodiment of the present invention. Referring to fig. 4, the difference between the display panel 11 of the present embodiment and the display panel 10 of fig. 1 is: the filter layers are arranged differently. Specifically, the filter layer 140A of the display panel 11 further covers the plurality of wavelength conversion patterns 130. In the present embodiment, the thickness T1 of the portion 141c of the filter layer 140A covering the wavelength conversion patterns 131 in the direction perpendicular to the surface 100s of the substrate 100 is different from the thickness T2 of the portion 141d of the filter layer 140A covering the wavelength conversion patterns 132 in the direction perpendicular to the surface 100s of the substrate 100.
For example, in the present embodiment, since the absorption conversion efficiency of the wavelength conversion pattern 131 is lower than that of the wavelength conversion pattern 132, the thickness T1 of the portion 141c of the filter layer 140A may be greater than the thickness T2 of the portion 141d of the filter layer 140A. Accordingly, a phenomenon that a portion of light (e.g., blue light) emitted by the light emitting element 120 overflows from the right above the light emitting element 120 without being absorbed by the wavelength conversion pattern 130 can be effectively suppressed. In other words, light mixing caused by the generation of unexpected light emitting colors can be avoided, which is helpful for improving the color shift phenomenon of the display panel 11 and improving the color gamut expression thereof.
On the other hand, in the present embodiment, the portion 141a of the filter layer 140A located between the wavelength conversion pattern 131 and the light emitting device 123 (or the first groove 111 not provided with the wavelength conversion pattern 130) and filled into the corresponding second groove 112a has a width Wa in the direction X, the portion 141b of the filter layer 140A located between the wavelength conversion pattern 131 and the wavelength conversion pattern 132 and filled into the corresponding second groove 112c has a width Wb in the direction X, and the width Wb of the portion 141b of the filter layer 140A is smaller than the width Wa of the portion 141a of the filter layer 140A. Accordingly, it is effectively reduced that a portion of the blue light not absorbed by the wavelength conversion pattern 130 overflows from the first groove 111 not provided with the wavelength conversion pattern 130, which is helpful for further improving the color shift phenomenon of the display panel 11 and improving the color gamut expression thereof.
Specifically, in other embodiments, the thickness of the filter layer in the direction Z and the width of the portion of the filter layer filling the second groove 112 in the direction X may also be adjusted according to the thickness of the wavelength conversion pattern 130 in the direction Z and the width in the direction X, so as to obtain the best brightness and color gamut representation.
Fig. 5 is a schematic cross-sectional view of a display panel of a third embodiment of the present invention. Referring to fig. 5, the difference between the display panel 12 of the present embodiment and the display panel 11 of fig. 4 is: the configuration of the isolation structure layer and the configuration mode of the filter layer are different. Specifically, the isolation structure layer 110A of the display panel 12 has a first surface 111s and a second surface 112s respectively defining the first groove 111 and the second groove 112. A first included angle a1 is formed between the first surface 111s and the surface 100s of the substrate 100, a second included angle a2 is formed between the second surface 112s and the surface 100s of the substrate 100, and the second included angle a2 of the isolation structure layer 110A is greater than the first included angle a 1. For example, the light collecting effect of the isolation structure layer 110A can be further improved by the first included angle a1 of the isolation structure layer 110A being smaller than 70 degrees. By setting the second included angle a2 of the isolation structure layer 110A to be greater than 70 degrees and smaller than 90 degrees, the volume of the filter layer 140B filled in the second groove 112 can be increased, which is helpful for suppressing the blue light from overflowing.
On the other hand, in the present embodiment, the width Wb 'of the portion 141B' of the display panel 12, which is located between the wavelength conversion pattern 131 and the wavelength conversion pattern 132 and fills the corresponding second groove 112, in the direction X is substantially equal to the width Wa of the portion 141a of the filter layer 140B, which is located between the wavelength conversion pattern 131 and the light emitting device 123 (or the first groove 111 not provided with the wavelength conversion pattern 130) and fills the corresponding second groove 112a, in the direction X.
Fig. 6 is a schematic cross-sectional view of a display panel of a fourth embodiment of the present invention. Referring to fig. 6, the difference between the display panel 13 of the present embodiment and the display panel 11 of fig. 4 is: the display panel 13 further includes an auxiliary layer 115. In detail, the auxiliary layer 115 is disposed on the substrate 100, and the plurality of wavelength conversion patterns 130 and the filter layer 140C fill a plurality of portions (e.g., the portion 141a "and the portion 141B") of the second groove 112 and the isolation structure layer 110B cover the auxiliary layer 115. The auxiliary layer 115 has a plurality of openings 115a overlapping the plurality of first grooves 111, and the plurality of light emitting elements 120 of the display panel 13 are respectively located in the openings 115a of the auxiliary layer 115. In the present embodiment, the light emitting element 120 and the auxiliary layer 115 have a thickness Ta and a thickness Tb in a normal direction (e.g., direction Z) of the surface 100s of the substrate 100, respectively, and the thickness Ta of the light emitting element 120 is greater than the thickness Tb of the auxiliary layer 115. Accordingly, the light energy utilization rate of the light emitting element 120 can be further improved.
On the other hand, in the embodiment, the materials of the auxiliary layer 115 and the isolation structure layer 110B may be selectively the same, but the invention is not limited thereto. In other embodiments, the material of the auxiliary layer 115 and the material of the isolation structure layer 110B may be different.
Fig. 7 is a schematic cross-sectional view of a display panel of a fifth embodiment of the present invention. Referring to fig. 7, the difference between the display panel 14 of the present embodiment and the display panel 10 of fig. 1 is: the filter layer has a different configuration. Specifically, the filter layer 140D of the display panel 14 further covers the plurality of wavelength conversion patterns 130. In the present embodiment, the thickness T3 of the portion 141e1 of the filter layer 140D covering (or overlapping) the wavelength conversion pattern 131 in the direction perpendicular to the surface 100s of the substrate 100 (e.g., the direction Z) is greater than the thickness T4 of the portion 141e2 of the isolation structure layer 110 of the filter layer 140D covering (or overlapping) the isolation structure layer 110 in the direction perpendicular to the surface 100s of the substrate 100. Similarly, the thickness T3 'of the portion 141f1 of the wavelength conversion pattern 132 covered (or overlapped by) the filter layer 140D in the direction perpendicular to the surface 100s of the substrate 100 is greater than the thickness T4' of the portion 141f2 of the isolation structure layer 110 covered (or overlapped by) the filter layer 140D in the direction perpendicular to the surface 100s of the substrate 100.
More specifically, the thickness of the portion of the filter layer 140D that overlaps any one of the wavelength conversion patterns 130 (e.g., the portion 141e1 and the portion 141f1) in a direction perpendicular to the surface 100s of the substrate 100 decreases from the geometric center (e.g., the geometric center C and the geometric center C') of the portion of the filter layer 140D toward a direction away from the geometric center. In the present embodiment, cross-sectional profiles (e.g., XZ plane) of the portions 141e1 and 141f1 of the filter layer 140D may be arc-shaped, but not limited thereto. In other embodiments, the cross-sectional profile of the portion of the filter layer overlapping the wavelength conversion pattern may also be a polygonal line.
It should be noted that, since the amount of blue light overflowing directly above the light emitting device 120 is large, the above thickness relationship of the filter layer 140D can effectively suppress the phenomenon that part of the light (for example, blue light) emitted by the light emitting device 120 overflows directly above the light emitting device 120 without being absorbed by the wavelength conversion pattern 130. In other words, light mixing caused by the generation of unexpected light emitting colors can be avoided, which is helpful for improving the color shift phenomenon of the display panel 15 and improving the color gamut expression thereof. In addition, by the thickness gradient relationship of the portion (e.g., the portion 141e1 and the portion 141f1) where the filter layer 140D overlaps the wavelength conversion pattern 130, the color gamut expression can be improved and the overall brightness can be optimized.
Fig. 8 is a schematic cross-sectional view of a display panel of a sixth embodiment of the present invention. Referring to fig. 8, the difference between the display panel 15 of the present embodiment and the display panel 11 of fig. 4 is: the composition of the display panel is different. In order to further improve the color gamut representation of the display panel 15, for example, achieve a color representation with a wide color gamut, the display panel 15 may further include a color filter layer 200. The filter layer 140A is located between the color filter layer 200 and the wavelength conversion pattern 130. In the present embodiment, the color filter layer 200 includes a plurality of color filter patterns 210, a plurality of light-shielding patterns 220, and a plurality of light-transmitting patterns 230. The color filter patterns 210 and the light transmissive patterns 230 are respectively disposed between the light blocking patterns 220, and the color filter patterns 210 are respectively overlapped with the wavelength conversion patterns 130.
For example, the color filter patterns 211 and 212 of the color filter layer 200 are respectively overlapped with the wavelength conversion patterns 131 and 132 in a direction (e.g., the direction Z) perpendicular to the surface 100s of the substrate 100, and are respectively a green filter pattern and a red filter pattern, but not limited thereto. In other embodiments, the wavelength of the transmitted light of the color filter pattern can also be adjusted according to the conversion wavelength of the corresponding wavelength conversion pattern 130. It is noted that in the present embodiment, since the wavelength conversion pattern 130 is not disposed in the first groove 111 provided with the light emitting device 123, the light-transmitting pattern 230 may be disposed on a portion of the color filter layer 200 overlapping the light emitting device 123, so that light (e.g., blue light) emitted by the light emitting device 123 can directly pass through the color filter layer 200.
In summary, in the display panel of the embodiment of the invention, the plurality of first grooves of the isolation structure layer are provided with the plurality of light emitting elements and define the plurality of pixel regions of the display panel, and the plurality of second grooves are further provided between the plurality of first grooves of the isolation structure layer. The filter layer covering the isolation structure layer and filled in the second grooves can effectively prevent part of light emitted by any light-emitting element from being emitted from the adjacent pixel regions after the wavelength conversion pattern in the same first groove and the isolation structure layer define the part of the first groove. In other words, light mixing caused by the generation of unexpected light emitting colors can be avoided, which is helpful for improving the color cast phenomenon of the display panel and improving the color gamut expression of the display panel.
Claims (15)
1. A display panel, comprising:
a substrate;
the isolation structure layer is arranged on the substrate and is provided with a plurality of first grooves and a plurality of second grooves which are alternately arranged;
a plurality of light emitting elements respectively arranged in the first grooves;
a plurality of wavelength conversion patterns arranged in at least part of the first grooves and covering at least part of the light-emitting elements; and
and the filter layer covers the isolation structure layer and is filled in the second grooves.
2. The display panel of claim 1, wherein a ratio of transmittance of the filter layer at wavelengths of 530nm and 628nm to transmittance of the filter layer at a wavelength of 480nm is greater than or equal to 2.
3. The display panel of claim 1, wherein the filter layer covers the wavelength conversion patterns.
4. The display panel of claim 3, wherein the wavelength conversion patterns comprise a first wavelength conversion pattern and a second wavelength conversion pattern, a converted wavelength of the first wavelength conversion pattern is different from a converted wavelength of the second wavelength conversion pattern, and a thickness of a portion of the filter layer covering the first wavelength conversion pattern is different from a thickness of another portion of the filter layer covering the second wavelength conversion pattern.
5. The display panel of claim 3, wherein a portion of the filter layer overlapping any of the wavelength conversion patterns has a thickness greater than a thickness of another portion of the filter layer overlapping the isolation structure layer.
6. The display panel of claim 3, wherein a thickness of a portion of the filter layer overlapping any of the wavelength conversion patterns decreases from a geometric center of the portion of the filter layer toward a direction away from the geometric center, and the geometric center of the portion of the filter layer overlaps a corresponding one of the light emitting devices.
7. The display panel of claim 3, further comprising a plurality of color filter patterns respectively overlapping the wavelength converting patterns, and the filter layer is disposed between the color filter patterns and the wavelength converting patterns.
8. The display panel of claim 1, wherein the wavelength conversion patterns include a first wavelength conversion pattern and a second wavelength conversion pattern arranged in a direction and adjacent to each other, the conversion wavelength of the first wavelength conversion pattern is different from the conversion wavelength of the second wavelength conversion pattern, the filter layer is located between the first wavelength conversion pattern and the second wavelength conversion pattern and filled into a corresponding second groove, and the part of the filter layer in the direction has a first width, the first grooves and the first wavelength conversion patterns are arranged in the direction, and the adjacent one is not provided with the wavelength conversion patterns, the filter layer is located between the first wavelength conversion pattern and one of the first grooves and filled into the other corresponding second groove, and the other part of the filter layer has a second width in the direction, and the second width is larger than the first width.
9. The display panel of claim 1, wherein the isolation structure layer has a first surface and a second surface respectively defining the first groove and the second groove, a first included angle is formed between the first surface and the surface of the substrate, a second included angle is formed between the second surface and the surface of the substrate, and the second included angle is greater than the first included angle.
10. The display panel of claim 9, wherein the first included angle is less than 70 degrees, and the second included angle is greater than 70 degrees and less than 90 degrees.
11. The display panel of claim 1, wherein the wavelength conversion patterns include a first wavelength conversion pattern, a second wavelength conversion pattern, and a third wavelength conversion pattern, the first wavelength conversion pattern and the second wavelength conversion pattern arranged in a first direction have different conversion wavelengths from each other, the first wavelength conversion pattern and the third wavelength conversion pattern arranged in a second direction have the same conversion wavelengths from each other, a portion of the filter layer between the first wavelength conversion pattern and the second wavelength conversion pattern has a first width in the first direction, another portion of the filter layer between the first wavelength conversion pattern and the third wavelength conversion pattern has a second width in the second direction, and the first width is greater than the second width.
12. The display panel of claim 1, further comprising:
and the auxiliary layer is arranged on the substrate, and the wavelength conversion patterns, the filter layer and the isolation structure layer cover the auxiliary layer.
13. The display panel of claim 12, wherein any of the light emitting elements and the auxiliary layer has a first thickness and a second thickness in a normal direction of the substrate, respectively, and the first thickness is greater than the second thickness.
14. The display panel of claim 12, wherein the auxiliary layer has a plurality of openings overlapping the first grooves, and the light emitting elements are respectively located in the openings of the auxiliary layer.
15. The display panel of claim 1, wherein the light emitting devices are blue light emitting diodes.
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| TW109119275A TWI766293B (en) | 2020-06-09 | 2020-06-09 | Display panel |
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| CN116053387A (en) * | 2023-03-07 | 2023-05-02 | 惠科股份有限公司 | Display panel manufacturing method and display panel |
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| CN112562525B (en) | 2022-09-30 |
| TW202147655A (en) | 2021-12-16 |
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