TWI839694B - Display device - Google Patents

Abstract

The present disclosure provides a display device including a first light-emitting unit, a second light-emitting unit, and a third light-emitting unit. The first light-emitting unit includes a first light-emitting chip and a blue color resist having a first blue chromaticity between 0.141 and 0.151 and a second blue chromaticity between 0.033 and 0.043, where a first light entering the blue color resist has the peak wavelength between 459 nm and 469 nm. The second light-emitting unit includes a second light-emitting chip and a green color resist having a first green chromaticity between 0.151 and 0.171 and a second green chromaticity between 0.745 and 0.755, where a second light entering the green color resist has the peak wavelength between 527 nm and 537 nm. The third light-emitting unit includes a third light-emitting chip and a red color resist having a first red chromaticity between 0.692 and 0.698 and a second red chromaticity between 0.302 and 0.308, where a third light entering the red color resist has the peak wavelength between 639 nm and 649 nm.

Description

Display device

The present disclosure relates to display devices, and in particular to display devices including color resists.

In the development of display devices, the size of the light-emitting chips in the devices has gradually become smaller, so that the light-emitting chips can provide advantages such as increased device performance and reduced device energy consumption. For example, sub-millimeter light-emitting diodes (mini LEDs) and micro light-emitting diodes (micro LEDs) as pixel units of displays can increase the clarity and contrast of the display and save the energy consumption of the display. However, the combination of the light-emitting chip and other components in the display device may affect the color saturation of the light emitted by the display device when it reaches the user, thereby affecting the imaging effect. Therefore, how to adjust the parameters of the light-emitting chip and other components to improve the imaging color saturation of the display device is an important development project in the field of display devices.

According to some embodiments of the present disclosure, a display device includes a first light-emitting unit, which includes a first light-emitting chip and a blue color resist located above the first light-emitting chip, wherein the blue color resist has a first blue chromaticity (B _x ) between 0.141 and 0.151 and a second blue chromaticity (B _y ) between 0.033 and 0.043 under a standard C light source, and a first light incident on the blue color resist has a peak wavelength between 459 nm and 469 nm. The display device includes a second light emitting unit, which includes a second light emitting chip and a green color resist located above the second light emitting chip, wherein the green color resist has a first green chromaticity (G _x ) between 0.151 and 0.171 and a second green chromaticity (G _y ) between 0.745 and 0.755 under a standard C light source, and a second light incident on the green color resist has a peak wavelength between 527 nm and 537 nm. The display device includes a third light-emitting unit, which includes a third light-emitting chip and a red color resist located above the third light-emitting chip, wherein the red color resist has a first red chromaticity (R _x ) between 0.692 and 0.698 and a second red chromaticity (R _y ) between 0.302 and 0.308 under a standard C light source, and the third light incident on the red color resist has a peak wavelength between 639 nm and 649 nm.

In one embodiment of the present disclosure, the peak wavelength intensity ratio between the third light and the first light is between 0.2 and 0.4.

In one embodiment of the present disclosure, the peak wavelength intensity ratio between the second light and the first light is between 0.5 and 0.7.

In one embodiment of the present disclosure, the first light has a half-height width between 20 nm and 30 nm, the second light has a half-height width between 20 nm and 30 nm, and the third light has a half-height width between 35 nm and 45 nm.

In one embodiment of the present disclosure, the first light emitting chip, the second light emitting chip and the third light emitting chip are blue light emitting diodes.

In one embodiment of the present disclosure, the second light emitting unit further includes a first conversion layer under the green color filter and converts blue light into green light, and the third light emitting unit further includes a second conversion layer under the red color filter and converts blue light into red light.

In one embodiment of the present disclosure, the first light emitting chip is a blue light emitting diode, the second light emitting chip is a green light emitting diode, and the third light emitting chip is a red light emitting diode.

In one embodiment of the present disclosure, the display device further includes a liquid crystal module located between the first light emitting chip and the blue color resist, between the second light emitting chip and the green color resist, and between the third light emitting chip and the red color resist.

According to some embodiments of the present disclosure, a liquid crystal display device includes a backlight module that emits light, a liquid crystal layer located above the backlight module, and a filter located above the liquid crystal layer, wherein the light incident on the filter includes a first light having a peak wavelength between 459 nm and 469 nm, a second light having a peak wavelength between 527 nm and 537 nm, and a third light having a peak wavelength between 639 nm and 649 nm. The filter includes a blue color resist, a green color resist and a red color resist, wherein the blue color resist has a first blue chromaticity ( _Bx ) ranging from 0.141 to 0.151 and a second blue chromaticity ( _By ) ranging from 0.033 to 0.043 under a standard C light source, the green color resist has a first green chromaticity ( _Gx ) ranging from 0.151 to 0.171 and a second green chromaticity ( _Gy ) ranging from 0.745 to 0.755 under a standard C light source, and the red color resist has a first red chromaticity ( _Rx ) ranging from 0.692 to 0.698 and a second red chromaticity ( _Ry ) ranging from 0.302 to 0.308 under a standard C light source.

In an implementation of the present disclosure, the backlight module includes a side-entry light emitting diode, and the light incident on the filter is a mixture of a first light, a second light, and a third light.

In order to realize the different features of the mentioned subject matter, the following disclosure provides many different embodiments or examples. In the accompanying drawings, for the sake of clarity, the thickness of layers, films, panels, regions, etc. is magnified. In the entire specification, the same figure markings represent the same elements. It should 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 another element, or an intermediate element can also exist. On the contrary, when an element is referred to as being "directly on" or "directly connected to" another element, there is no intermediate element. As used herein, "connection" can refer to physical and/or electrical connection. Furthermore, "electrical connection" or "coupling" can be the presence of other elements between two elements.

As used herein, "about", "approximately", or "substantially" includes the stated value and the average value within an acceptable deviation range of a particular value determined by a person of ordinary skill in the art, taking into account the measurement in question and the particular 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 ±30%, ±20%, ±10%, ±5%. Furthermore, as used herein, "about", "approximately", or "substantially" can select a more acceptable deviation range or standard deviation depending on the optical property, etching property or other property, and can apply to all properties without using one standard deviation.

The present disclosure provides a display device, which includes a plurality of light-emitting units configured to emit blue light, green light, and red light. Each light-emitting unit includes a light-emitting chip and a filter, wherein each color resist of the filter has a chromaticity within a given range. On the other hand, the light emitted by each light-emitting chip passes through the filter, wherein the light incident on the filter has a given peak wavelength range. Through the combination of the elements in the light-emitting unit and each color resist, the light incident on the blue color resist has a peak wavelength between 459 nm and 469 nm, the light incident on the green color resist has a peak wavelength between 527 nm and 537 nm, and the light incident on the red color resist has a peak wavelength between 639 nm and 649 nm. Since the light incident into the filter of the display device has an appropriate peak wavelength, and the filter in the display device includes a color resist with an appropriate chromaticity, the light emitted by the display device has a chromaticity that highly complies with the standard, thereby providing the display device with good color saturation.

According to some embodiments of the present disclosure, FIG. 1 shows a cross-sectional view of a display device 100. As shown in FIG. 1, the display device 100 includes a substrate 110, a light-emitting chip set 102 disposed on the upper surface of the substrate 110, and a filter 104 above the light-emitting chip set 102. Through the combination design of the light-emitting chip set 102 and the filter 104 above it, different areas in the display device 100 can be configured as light-emitting units emitting light of different wavelengths. The structure of the display device 100 will be further described in detail below.

The display device 100 includes a substrate 110 and a plurality of light-emitting units on the substrate 110. Specifically, the light-emitting units on the substrate 110 include a first light-emitting unit 120, a second light-emitting unit 130, and a third light-emitting unit 140 configured to emit visible light of different wavelengths. For example, the first light-emitting unit 120 can be configured to emit blue light, the second light-emitting unit 130 can be configured to emit green light, and the third light-emitting unit 140 can be configured to emit red light. By controlling the plurality of light-emitting units configured to emit blue light, green light, and red light, respectively, the display device 100 can present a color image. For example, in some embodiments, the substrate 110 can include a printed circuit board (PCB) for controlling the first light-emitting unit 120, the second light-emitting unit 130, and the third light-emitting unit 140.

More specifically, the plurality of light-emitting units on the substrate 110 of the display device 100 have an appropriate combination of components, so that the light has a peak wavelength within a given range before passing through the filter 104 above the light-emitting chip group 102, so that the display device 100 can have good color saturation. In an embodiment in which the first light-emitting unit 120 is configured to emit blue light, the second light-emitting unit 130 is configured to emit green light, and the third light-emitting unit 140 is configured to emit red light, the light incident into the filter 104 in the first light-emitting unit 120 has a peak wavelength between 459 nm and 469 nm, for example, 464 nm. The light incident into the filter 104 in the second light-emitting unit 130 has a peak wavelength between 527 nm and 537 nm, for example, 532 nm. The light incident into the filter 104 in the third light emitting unit 140 has a peak wavelength between 639 nm and 649 nm, for example, 644 nm. Since the light incident into the filter 104 in the first light emitting unit 120, the second light emitting unit 130 and the third light emitting unit 140 each has a suitable peak wavelength range, the color saturation of the display device 100 is increased. For example, if the light incident into the filter 104 in the first light emitting unit 120 has a peak wavelength less than 459 nm, the color saturation of the display device 100 may be reduced; if the light incident into the filter 104 in the first light emitting unit 120 has a peak wavelength greater than 469 nm, it may be difficult to significantly increase the color saturation of the display device 100. In the case where the first light emitting unit 120 needs to be significantly adjusted to achieve a peak wavelength outside the above range, adjusting the first light emitting unit 120 to emit a peak wavelength greater than 469 nm may cost too much.

As described above, the plurality of light-emitting units of the display device 100 include a combination of a light-emitting chip set 102 and a filter 104. More specifically, different regions in the filter 104 have color resists of different colors, such as a mixture of blue, green, and red color materials and solvents coated on a glass substrate to form the color resists of each color. When the light from the light-emitting chip set 102 passes through the color resists in the filter 104, each light-emitting unit can emit light corresponding to a different wavelength, so that the display device 100 can present a color image. In an embodiment in which the first light emitting unit 120 is configured to emit blue light, the second light emitting unit 130 is configured to emit green light, and the third light emitting unit 140 is configured to emit red light, as shown in FIG. 1 , the first light emitting unit 120 configured to emit blue light includes a first light emitting chip 122 and a blue color resist 124 located above the first light emitting chip 122. The second light emitting unit 130 configured to emit green light includes a second light emitting chip 132 and a green color resist 134 located above the second light emitting chip 132. The third light emitting unit 140 configured to emit red light includes a third light emitting chip 142 and a red color resist 144 located above the third light emitting chip 142.

The blue color resist 124, the green color resist 134, and the red color resist 144 in the display device 100 have different chromaticities, respectively, so as to provide the display device 100 with good color saturation. Generally speaking, a standard C light source (C light) can be used as a standard light source for defining chromaticity, so the standard C light source is used as a light source to measure the chromaticity of each color resist in this article. The blue color resist 124 of the first light-emitting unit 120 has a first blue chromaticity (B _x ) between 0.141 and 0.151, for example, 0.146 under the standard C light source. The blue color resist 124 has a second blue chromaticity (B _y ) between 0.033 and 0.043, for example, 0.038 under the standard C light source. The green color resist 134 of the second light emitting unit 130 has a first green chromaticity (G _x ) between 0.151 and 0.171, such as 0.161, under the standard C light source. The green color resist 134 has a second green chromaticity (G _y ) between 0.745 and 0.755, such as 0.750, under the standard C light source. The red color resist 144 of the third light emitting unit 140 has a first red chromaticity (R _x ) between 0.692 and 0.698, such as 0.695, under the standard C light source. The red color resist 144 has a second red chromaticity (R _y ) between 0.302 and 0.308, such as 0.305, under the standard C light source. Since the color resist in each light-emitting unit has an appropriate chromaticity range, the light passing through each color resist has a higher chromaticity, thereby increasing the color saturation of the display device 100.

The display device 100 uses a combination of light-emitting chips and color resists in each light-emitting unit so that the various colors of light emitted by the display device 100 have appropriate wavelengths and chromaticity, thereby providing the display device 100 with good color saturation. According to some embodiments of the present disclosure, FIG. 2 shows a chromaticity diagram of the display device 100 and the recommended standard Rec. 2020. Generally speaking, the recommended standard Rec. 2020 of the International Telecommunication Union (ITU-R Recommendation) can be used as the international standard for the color range of the display device. Specifically, in the chromaticity coordinate diagram of the recommended standard Rec. 2020, the first blue chromaticity (B _x ) is 0.131, the second blue chromaticity (B _y ) is 0.046; the first green chromaticity (G _x ) is 0.17, the second green chromaticity (G _y ) is 0.797; the first red chromaticity (Rx) is 0.708, and the second red chromaticity (Ry) is 0.292. When the color range of the device overlaps with the color range of the recommended standard Rec. 2020 in the chromaticity coordinate diagram, the overlap ratio of the range can be used as a numerical determination of the color saturation. For example, when the color range of the display device 100 and the color range of the recommended standard Rec. 2020 have an overlapping area of 98.3%, the color saturation of the display device 100 can be referred to as 98.3% Rec. 2020.

As shown in FIG. 2 , in some embodiments, in the color coordinate diagram of the display device 100, the first blue chromaticity (B _x ) is 0.131, the second blue chromaticity (B _y ) is 0.046; the first green chromaticity (G _x ) is 0.17, the second green chromaticity (G _y ) is 0.797; the first red chromaticity (Rx) is 0.708, and the second red chromaticity (Ry) is 0.292. Since the color range presented by the display device 100 has a large overlap with the color range of the recommended standard Rec. 2020 in the color coordinate diagram (that is, the color range presented by the display device 100 is close to the color range of the recommended standard Rec. 2020), the display device 100 will have good color saturation for the user. In some embodiments, the display device 100 may have a color saturation of 97% Rec. 2020 to 99% Rec. 2020, for example 98% Rec. 2020.

In some embodiments, each light-emitting chip in the display device 100 can emit light of different intensities, so that there is an appropriate peak wavelength intensity ratio between the light incident on the corresponding color resist. For example, in some examples, the third light-emitting unit 140 configured to emit red light and the first light-emitting unit 120 configured to emit blue light have an intensity ratio between the peak wavelength of the light incident on the red color resist 144 and the peak wavelength of the light incident on the blue color resist 124, which may be between 0.2 and 0.4. In some examples, the second light-emitting unit 130 configured to emit green light and the first light-emitting unit 120 configured to emit blue light have an intensity ratio between the peak wavelength of the light incident on the green color resist 134 and the peak wavelength of the light incident on the blue color resist 124, which may be between 0.5 and 0.7. When the first light emitting unit 120, the second light emitting unit 130, and the third light emitting unit 140 emit light at the same time, since the light incident into each color filter has an appropriate peak wavelength intensity ratio, the light of different peak wavelengths emitted by each light emitting unit can be mixed to produce white light with low color deviation. In other words, when the light incident into each filter 104 in the first light emitting unit 120, the second light emitting unit 130, and the third light emitting unit 140 has an appropriate peak wavelength intensity ratio, the white light emitted by the display device 100 can avoid blue or yellow chromaticity deviation. Specifically, according to the recommended standard Rec. 2020, the first white chromaticity (W _x ) of the white light is 0.3127, and the second white chromaticity (W _y ) is 0.3290. When the first light emitting unit 120, the second light emitting unit 130, and the third light emitting unit 140 of the display device 100 have the above peak wavelength intensity ratio, the white light emitted by the display device 100 may have a first white chromaticity (W _x ) between 0.280 and 0.313, and a second white chromaticity (W _y ) between 0.290 and 0.329. Since the chromaticity of the white light of the display device 100 is close to the white chromaticity of the recommended standard Rec. 2020, the white light of the display device 100 may have good color saturation.

In some embodiments, the light incident on each color resist may have a small full width at half maximum (FWHM), thereby increasing the color saturation of the display device 100. For example, in the first light-emitting unit 120 configured to emit blue light, the light incident on the blue color resist 124 may have a half-height width between 20 nm and 30 nm. In the second light-emitting unit 130 configured to emit green light, the light incident on the green color resist 134 may have a half-height width between 20 nm and 30 nm. In the third light-emitting unit 140 configured to emit red light, the light incident on the red color resist 144 may have a half-height width between 35 nm and 45 nm. Since the light incident into each filter in each light-emitting unit has a sufficiently small half-height width, the light emitted by the display device 100 has precise chromaticity, thereby providing the display device 100 with good color saturation.

In some embodiments, the plurality of light-emitting units in the display device 100 may have a combination of various light-emitting chips and other components, so that the display device 100 achieves the above-mentioned color saturation. For example, before the light emitted by the first light-emitting chip 122, the second light-emitting chip 132, and the third light-emitting chip 142 reaches the filter 104, the light may pass through the optical layer 150 between the substrate 110 and the filter 104, wherein the optical layer 150 may evenly pass through the light passing through the optical layer 150 and further improve the optical quality of the display device 100. In some examples, the optical layer 150 may be an anti-reflection coating (ARC) so that the light emitted by the first light emitting chip 122 , the second light emitting chip 132 , and the third light emitting chip 142 can more easily reach the filter 104 , thereby increasing the optical efficiency of the display device 100 .

In some embodiments, as shown in FIG. 1 , the first light emitting chip 122 of the first light emitting unit 120, the second light emitting chip 132 of the second light emitting unit 130, and the third light emitting chip 142 of the third light emitting unit 140 may be blue light emitting diodes. The blue light emitted by the first light emitting chip 122, the second light emitting chip 132, and the third light emitting chip 142 passes through the conversion layer 106 under the filter 104, thereby being converted into the color light of each light emitting unit. For example, the first light emitting unit 120 may include a protective layer 126 under the blue color resist 124 and not converting blue light, the second light emitting unit 130 may include a first conversion layer 136 under the green color resist 134 and converting blue light into green light, and the third light emitting unit 140 may include a second conversion layer 146 under the red color resist 144 and converting blue light into red light. Since the conversion layer 106 is included between the light emitting chip set 102 and the filter 104, wherein the conversion layer 106 can provide different color lights for the display device 100, multiple identical light emitting chips can be configured on the substrate 110 to simplify the manufacturing process.

In some embodiments, the conversion layer 106 may be a quantum dot (QD) material layer, which includes semiconductor particles of microscopic size. When the semiconductor particles absorb energy, they may generate radiated light in a narrow wavelength range, thereby providing the display device 100 with high color saturation. Specifically, the wavelength conversion effect of the conversion layer 106 is related to the size of the quantum dots in the conversion layer 106. In some examples, the first conversion layer 136 that converts blue light into green light may include a first quantum dot 138, wherein the particle size of the first quantum dot 138 is between about 2 nm and about 4 nm, such as about 3 nm. In some examples, the second conversion layer 146 that converts blue light into red light may include a second quantum dot 148, wherein the particle size of the second quantum dot 148 is between about 6 nm and about 8 nm, such as about 7 nm. In some embodiments, the first quantum dot 138 and the second quantum dot 148 may have a shell-core structure to prevent the first quantum dot 138 and the second quantum dot 148 from being damaged by oxygen or moisture. For example, the core material forming the first quantum dot 138 and the second quantum dot 148 may include high quantum efficiency materials such as CdSe, CdS, CdTe, PbS, InP, _CuInS2 , etc., and the material forming the shell of the first quantum dot 138 and the second quantum dot 148 may include sacrificial materials such as ZnSe, ZnS, HgS, CdSe, CdS, etc.

In the embodiment where the display device 100 includes the conversion layer 106, the optical layer 150 may be a wavelength selective layer (short-pass reflector, SPR), so that the light passing through the conversion layer 106 can more easily reach the filter 104, thereby increasing the optical efficiency of the display device 100. Specifically, as a wavelength selective layer, the optical layer 150 can selectively allow blue light with a relatively short wavelength to pass through the optical layer 150, and selectively reflect green light and red light with a relatively long wavelength. When the blue light emitted by the second light-emitting chip 132 reaches the optical layer 150, the blue light can penetrate the optical layer 150 and reach the first conversion layer 136. When the first quantum dots 138 in the first conversion layer 136 absorb the blue light, the green light generated by the first quantum dots 138 may be emitted in all directions, so that part of the green light is emitted toward the optical layer 150. The optical layer 150, as a wavelength selective layer, can reflect the green light, thereby increasing the amount of green light reaching the filter 104. Similarly, the optical layer 150, as a wavelength selective layer, can also reflect the red light generated by the second quantum dots 148, thereby increasing the amount of red light reaching the filter 104.

According to some embodiments of the present disclosure, FIG. 3 shows a cross-sectional view of a display device 200. As shown in FIG. 3, the display device 200 includes a substrate 210 and a first light emitting unit 220, a second light emitting unit 230, and a third light emitting unit 240 on the substrate 210. A filter 204 is formed above the substrate 210, so that the first light emitting unit 220 includes a first light emitting chip 222 and a blue color resist 224, the second light emitting unit 230 includes a second light emitting chip 232 and a green color resist 234, and the third light emitting unit 240 includes a third light emitting chip 242 and a red color resist 244. The display device 200 of FIG. 3 is similar to the display device 100 of FIG. 1, except that a conversion layer (such as the conversion layer 106 in FIG. 1) is not included below the filter 204. Specifically, in the display device 200, the first light emitting chip 222 of the first light emitting unit 220 is a blue light emitting diode, the second light emitting chip 232 of the second light emitting unit 230 is a green light emitting diode, and the third light emitting chip 242 of the third light emitting unit 240 is a red light emitting diode. For example, the second light emitting chip 232 may include a blue light emitting chip 233 and a first quantum dot 238 thereon, wherein the first quantum dot 238 can convert blue light into green light, so that the second light emitting chip 232 forms a green light emitting diode. The third light emitting chip 242 may include a blue light emitting chip 243 and a second quantum dot 248 thereon, wherein the second quantum dot 248 can convert blue light into red light, so that the third light emitting chip 242 forms a red light emitting diode. Since the first light emitting chip 222, the second light emitting chip 232, and the third light emitting chip 242 each emit different color lights required by the display device 200, the display device 200 may not include a conversion layer under the filter 204, thereby simplifying the manufacturing process of the display device 200. In some embodiments, before the different color lights emitted by the first light emitting chip 222, the second light emitting chip 232, and the third light emitting chip 242 reach the filter 204, the light may pass through the optical layer 250 between the substrate 210 and the filter 204 to further improve its optical quality. For example, the optical layer 250 may be an anti-reflection layer, so that the light emitted by the first light emitting chip 222, the second light emitting chip 232, and the third light emitting chip 242 can reach the filter 204 more easily.

In some embodiments, the light-emitting units in the display device may have different sizes, so that different light-emitting chips and other components may be applied to the display device. For example, as shown in FIG. 1 , the light-emitting chipset 102 of the display device 100 may be a micro light-emitting diode (micro LED), thereby forming an active light-emitting display device 100. Since the display device 100 has a micro light-emitting diode with high light-emitting efficiency as the light-emitting chipset 102, the brightness and response rate of the display device 100 are increased.

In some other embodiments, the light emitting chip set of the display device may be a sub-millimeter light emitting diode (mini LED). According to some embodiments of the present disclosure, FIG. 4 and FIG. 5 respectively show cross-sectional views of a display device 300 and a display device 400. As shown in FIG. 4, the display device 300 includes a substrate 310, a light emitting chip set 302 on the substrate 310, a conversion layer 306 above the light emitting chip set 302, and a filter 304 above the conversion layer 306, wherein the first light emitting chip 322, the second light emitting chip 332, and the third light emitting chip 342 are blue sub-millimeter light emitting diodes. As shown in FIG. 5 , the display device 400 includes a substrate 410, a light emitting chip set 402 on the substrate 410, and a filter 404 above the light emitting chip set 402, wherein the first light emitting chip 422 is a blue sub-millimeter light emitting diode, the second light emitting chip 432 is a green sub-millimeter light emitting diode, and the third light emitting chip 442 is a red sub-millimeter light emitting diode. The display device 300 of FIG. 4 is similar to the display device 100 of FIG. 1 , and the display device 400 of FIG. 5 is similar to the display device 200 of FIG. 3 , except that a thin film transistor (TFT) array 350 and a liquid crystal module 360 are included between the light emitting chip set 302 and the filter 304, and a thin film transistor array 450 and a liquid crystal module 460 are included between the light emitting chip set 402 and the filter 404. Since the display device 300 and the display device 400 have power-saving and high-yield sub-millimeter light-emitting diodes as the light-emitting chipsets 302 and 402, the energy consumption and process cost of the display device 300 and the display device 400 are reduced. In some examples, the display device 300 and the display device 400 include liquid crystal modules 360 and 460 for controlling the light emitting area, so the display device 300 and the display device 400 can also be called a liquid crystal display (LCD).

In some embodiments, the light-emitting chip in the display device can have different configurations, so that light-emitting chips and other components of different configurations can be applied to the display device. For example, as shown in FIG. 4, the light-emitting chip set 302 of the display device 300 can be configured between the substrate 310 and the filter 304, so that the light emitted by the light-emitting chip set 302 directly reaches the filter 304 above it, thereby improving the light uniformity of the display device 300. In some examples, the display device 300 can be called a direct type liquid crystal display device, and the light-emitting chip set 302 can be called a direct type backlight module.

In some other embodiments, the light-emitting chip of the display device can be arranged on the side of the substrate. According to some embodiments of the present disclosure, FIG. 6 and FIG. 7 respectively show cross-sectional views of display device 500 and display device 600. As shown in FIG. 6, display device 500 includes substrate 510, light-emitting chip set 502 on the side of substrate 510, conversion layer 506 above substrate 510, filter 504 above conversion layer 506, and thin film transistor array 550 and liquid crystal module 560 between substrate 510 and conversion layer 506, wherein light-emitting chip set 502 is a blue light-emitting diode. Display device 500 of FIG. 6 is similar to display device 300 of FIG. 4, except that light-emitting chip set 502 is arranged on the side of substrate 510 instead of being arranged on the top of substrate 510. In some examples, the substrate 510 of the display device 500 may include a light guide plate, so that the light emitted by the light emitting chip set 502 can enter the substrate 510 from the side of the substrate 510, and then leave the substrate 510 from the upper surface of the substrate 510 to reach the filter 504 above the substrate 510. In some embodiments, the light emitting chip set 502 and the substrate 510 can be used together as a backlight module of the display device 500. In other words, in the display device 500, the light incident into the filter 504 may include a plurality of separate light rays, such as blue light with a peak wavelength between 459 nm and 469 nm, green light with a peak wavelength between 527 nm and 537 nm, and red light with a peak wavelength between 639 nm and 649 nm.

As shown in FIG. 7 , the display device 600 includes a substrate 610, a light emitting chip set 602 on the side of the substrate 610, a conversion layer 670 on the substrate 610, a filter 604 on the conversion layer 670, and a thin film transistor array 650 and a liquid crystal module 660 between the conversion layer 670 and the filter 604, wherein the light emitting chip set 602 is a blue light emitting diode. The display device 600 of FIG. 7 is similar to the display device 500 of FIG. 6 , except that the display device 600 does not include a conversion layer separated into a plurality of regions (such as the conversion layer 506 in FIG. 6 ) under the filter 604. Specifically, the blue light emitted by the light-emitting chip set 602 enters the substrate 610 from the side of the substrate 610 and leaves the substrate 610 from the top of the substrate 610. The conversion layer 670 above the substrate 610 may include a variety of light conversion materials (e.g., quantum dots of different particle sizes), so that the blue light leaving the substrate 610 can be converted into white light when passing through the conversion layer 670. After the white light leaving the conversion layer 670 passes through the filter 604 above the conversion layer 670, it will form a color light according to the color of the color filter 604, thereby providing the imaging function of the display device 600. In some embodiments, the light-emitting chip set 602, the substrate 610, and the conversion layer 670 can be used together as a backlight module of the display device 600. In other words, in the display device 600, the white light incident into the filter 604 is a mixture of at least three kinds of light, including blue light with a peak wavelength between 459 nm and 469 nm, green light with a peak wavelength between 527 nm and 537 nm, and red light with a peak wavelength between 639 nm and 649 nm.

As shown in FIG. 6 and FIG. 7 , the light emitting chipset 502 and the light emitting chipset 602 of the display device 500 and the display device 600 are arranged on the sides of the substrate 510 and the substrate 610, so that the number of material layers in the stack of the display device 500 and the display device 600 is reduced. In some examples, the light emitting chipset 502 and the light emitting chipset 602 of the display device 500 and the display device 600 are arranged on the sides of the substrate 510 and the substrate 610, respectively, so the display device 500 and the display device 600 can be called a liquid crystal display device with an edge type light source.

As described above, the structures shown in FIG. 1 and FIG. 3 to FIG. 7 are provided as examples. Other embodiments may differ from the structures described in FIG. 1 and FIG. 3 to FIG. 7. In practice, there may be more devices and/or material layers, fewer devices and/or material layers, different devices and/or material layers, or devices and/or material layers in different configurations than shown in FIG. 1 and FIG. 3 to FIG. 7. For example, one or more interlayer dielectric layers or wires may be disposed in the structures shown in FIG. 1 and FIG. 3 to FIG. 7.

According to the above-mentioned implementation manner of the present disclosure, the display device of the present disclosure includes a plurality of light-emitting units, wherein the first light-emitting unit is configured to emit blue light, the second light-emitting unit is configured to emit green light, and the third light-emitting unit is configured to emit red light. The light incident into the filter in each light-emitting unit has an appropriate peak wavelength, so that the color light emitted by the display device has a chromaticity that is highly consistent with the standard, thereby increasing the color saturation of the display device. In addition, each light-emitting unit includes a light-emitting chip and a filter, wherein the filter has a corresponding color resistance. Since the color resistance of the filter has an appropriate chromaticity under the standard C light source, the light emitted by the light-emitting chip has a chromaticity that is highly consistent with the standard after passing through the color resistance, so the color resistance of the filter helps to improve the color saturation of the display device.

In the following description, various measurements and evaluations will be performed on the display device of this disclosure. The following will refer to Experimental Examples 1 and 2 to describe the characteristics of the content of this disclosure in more detail. <Experimental Example 1: Evaluation of the effect of the peak wavelength of the display device on the color saturation>

In this experimental example, the effect of the peak wavelength on the color saturation of the display devices of the comparative example and the embodiment is evaluated. Specifically, the display devices of the comparative example and the embodiment are manufactured according to the structure of Figure 1 and the above content of this article, wherein the peak wavelengths of the blue light incident on the filters of each comparative example and each embodiment are different from each other, as shown in Table 1 below. Then, the blue chromaticity, green chromaticity, and red chromaticity of the display device are measured, and the chromaticity results of the display device are plotted in a chromaticity coordinate diagram. According to the results in the chromaticity coordinate diagram, the color saturation of the display device is judged with the overlap rate of the recommended standard Rec. 2020. The results of the blue light peak wavelength parameters, chromaticity and Rec. 2020 overlap rate of each comparative example and each embodiment are shown in Table 1. According to the results in Table 1, FIG. 8A shows the chromaticity coordinate diagram of the comparative example, the embodiment and the recommended standard Rec. 2020. FIG. 8B shows an enlarged view of the blue chromaticity area in FIG. 8A.

Table I Blue light peak wavelength (nm) Red hue Green hue Blue hue Rec.2020 Overlap Rate (%) _{R R} G _x G _y B _{x By} Rec.2020 -- 0.708 0.292 0.170 0.797 0.131 0.046 100.0% Comparison Example 1 449 0.709 0.291 0.153 0.789 0.151 0.026 94.8% Comparison Example 2 454 0.709 0.291 0.153 0.788 0.147 0.030 95.8% Embodiment 1 459 0.709 0.291 0.153 0.788 0.142 0.037 97.0% Embodiment 2 464 0.709 0.291 0.153 0.788 0.136 0.045 98.3%

As can be seen from Table 1 and FIG. 8A, in the display devices of each comparative example, the peak wavelength of the blue light incident on the filter is less than 459 nm, and the Rec. 2020 overlap rate of the display devices of each comparative example is less than 97%. In contrast, in the display devices of each embodiment, the peak wavelength of the blue light incident on the filter is between 459 nm and 469 nm, and the Rec. 2020 overlap rate of the display devices of each embodiment is greater than 97%. In more detail, as shown in FIG. 8B, the blue chromaticity of each embodiment is closer to the blue chromaticity of the recommended standard Rec. 2020 in the chromaticity coordinate diagram compared to the blue chromaticity of each comparative example. In other words, the display devices of each embodiment significantly improve the color saturation of blue light. Therefore, the light incident on the filter of each embodiment has an appropriate blue light peak wavelength, which can provide a good color saturation of the display device. <Experimental Example 2: Evaluating the effect of filter color resistance on color saturation>

In this experimental example, the influence of the chromaticity of the color resistance of the filter on the color saturation is evaluated for the display devices of the comparative example and the embodiment. Specifically, the display devices of the comparative example and the embodiment 2 in the experimental example 1 are manufactured according to the structure of FIG. 1 and the above content of this article, wherein the color resistance of the filter in the comparative example and the embodiment has different chromaticities. In more detail, the color resistance of the filter in the comparative example and the embodiment has different chromaticities under the standard C light source, as shown in Table 2 below. Then, the blue chromaticity, green chromaticity and red chromaticity of the display device are measured, and the chromaticity results of the display device are plotted in the chromaticity coordinate diagram. According to the results in the chromaticity coordinate diagram, the color saturation of the display device is judged with the overlap ratio of the recommended standard Rec. 2020. The results of the chromaticity and Rec. 2020 overlap ratio of the comparative example and the embodiment are shown in Table 3. According to the results in Table 3, FIG. 9 shows the chromaticity coordinate diagram of the comparative example, the embodiment and the recommended standard Rec. 2020.

Table II light source Red hue Green hue Blue hue _{R R} G _x G _y B _{x By} Comparison Example 3 C light 0.674 0.318 0.209 0.680 0.140 0.068 Embodiment 2 C light 0.695 0.305 0.151 0.745 0.146 0.038

Table 3 Blue light peak wavelength (nm) Red hue Green hue Blue hue Rec.2020 Overlap Rate (%) _{R R} G _x G _y B _{x By} Rec.2020 -- 0.708 0.292 0.170 0.797 0.131 0.046 100.0% Comparison Example 3 449 0.702 0.295 0.168 0.772 0.150 0.053 92.7% Embodiment 2 464 0.709 0.291 0.153 0.788 0.136 0.045 98.3%

As can be seen from Table 3 and Figure 9, the chromaticity of the color resistance of the filter in the display device of Comparative Example 3 under the standard C light source does not fall within the given range described in this article, and the Rec. 2020 overlap rate of the display device of Comparative Example 3 is significantly less than 97%. Specifically, the color resist of the filter of Comparative Example 3 does not have a first blue chromaticity (B _x ) between 0.141 and 0.151, a second blue chromaticity (B _y ) between 0.033 and 0.043, a first green chromaticity (G _x ) between 0.151 and 0.171, a second green chromaticity (G _y ) between 0.745 and 0.755, a first red chromaticity (R _x ) between 0.692 and 0.698, and a second red chromaticity (R _y ) between 0.302 and 0.308. In contrast, the chromaticity of the color resist of the filter in the display device of Example 2 under standard C light source falls within the above range, and the Rec. 2020 overlap rate of the display device of Example 2 is greater than 97%. In more detail, as shown in FIG. 9, the blue chromaticity and green chromaticity of Example 2 are closer to the blue chromaticity and green chromaticity of the recommended standard Rec. 2020 in the chromaticity coordinate diagram, compared with the blue chromaticity and green chromaticity of Comparative Example 3. In other words, the display device of Example 2 significantly improves the color saturation of blue light and green light. Therefore, the filter in the display device of Example 2 has appropriate color resistance chromaticity, which can provide the display device with good color saturation.

The features of some embodiments are summarized above so that those skilled in the art can better understand the perspective of the present disclosure. Those skilled in the art should understand that they can easily use the present disclosure as a basis for designing or modifying other processes and structures to achieve the same purpose and/or achieve the same advantages as the embodiments described herein. Those skilled in the art should also understand that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that various changes, substitutions and modifications can be made without departing from the spirit and scope of the present disclosure.

100: display device 102: light-emitting chip set 104: filter 106: conversion layer 110: substrate 120: first light-emitting unit 122: first light-emitting chip 124: blue color resistance 126: protective layer 130: second light-emitting unit 132: second light-emitting chip 134: green color resistance 136: first conversion layer 138: first quantum dot 140: third light-emitting unit 142: third light-emitting chip 144: red color resistance 146: second conversion layer 148: second quantum dot 150: optical layer 200: display device 204: filter 210: substrate 220: first light-emitting unit 222: first light-emitting chip 224: blue color resistor 230: second light-emitting unit 232: second light-emitting chip 233: blue light-emitting chip 234: green color resistor 238: first quantum dot 240: third light-emitting unit 242: third light-emitting chip 243: blue light-emitting chip 244: red color resistor 248: second quantum dot 250: optical layer 300: display device 302: light-emitting chip set 304: filter 306: conversion layer 310: substrate 322: first light-emitting chip 332: second light-emitting chip 342: third light-emitting chip 350: thin film transistor array 360: liquid crystal module 400: display device 402: light-emitting chip set 404: filter 410: substrate 422: first light-emitting chip 432: second light-emitting chip 442: third light-emitting chip 450: thin film transistor array 460: liquid crystal module 500: display device 502: light-emitting chip set 504: filter 506: conversion layer 510: substrate 550: thin film transistor array 560: liquid crystal module 600: display device 602: light-emitting chip set 604: filter 610: substrate 650: thin film transistor array 660: liquid crystal module 670: conversion layer

Aspects of the present disclosure are best understood from the following detailed description when read in conjunction with the accompanying drawings. It should be noted that various features are not drawn to scale, in accordance with standard methods in the industry. In fact, the sizes of various features may be arbitrarily increased or decreased for clarity of discussion. FIG. 1 shows a cross-sectional view of a display device according to an embodiment of the present disclosure. FIG. 2 shows a chromaticity coordinate diagram of the display device in FIG. 1 and the recommended standard Rec. 2020. FIGS. 3 to 7 show cross-sectional views of a display device according to some embodiments of the present disclosure. FIGS. 8A to 9 show chromaticity coordinate diagrams of a display device and the recommended standard Rec. 2020 according to some experimental examples of the present disclosure.

Domestic storage information (please note in the order of storage institution, date, and number) None Foreign storage information (please note in the order of storage country, institution, date, and number) None

100: Display device

102: Light-emitting chipset

104: Filter

106: Transition layer

110: Substrate

120: First light-emitting unit

122: First light-emitting chip

124: Blue color block

126: Protective layer

130: Second light-emitting unit

132: Second light-emitting chip

134: Green color block

136: First conversion layer

138: The first quantum dot

140: The third light-emitting unit

142: The third light-emitting chip

144: Red color block

146: Second conversion layer

148: Second quantum dot

150: Optical layer

Claims (9)

A display device comprises: a first light-emitting unit, comprising: a first light-emitting chip; and a blue color block located above the first light-emitting chip, wherein the blue color block has a first blue chromaticity (B _x ) between 0.141 and 0.151 and a second blue chromaticity (B _y ) between 0.033 and 0.043 under a standard C light source, wherein a first light incident on the blue color block has a peak wavelength between 459 nm and 469 nm; a second light-emitting unit, comprising: a second light-emitting chip; and a green color block located above the second light-emitting chip, wherein the green color block has a first green chromaticity (G _x ) between 0.151 and 0.171 and a second green chromaticity (G _y ) between 0.033 and 0.043 under a standard C light source. ) is between 0.745 and 0.755, wherein a second light incident on the green color resist has a peak wavelength between 527nm and 537nm; and a third light-emitting unit, comprising: a third light-emitting chip; and a red color resist located above the third light-emitting chip, wherein the red color resist has a first red chromaticity (R _x ) between 0.692 and 0.698 and a second red chromaticity (R _y ) between 0.302 and 0.308 under a standard C light source, wherein a third light incident on the red color resist has a peak wavelength between 639nm and 649nm, wherein a peak wavelength intensity ratio between the third light and the first light is between 0.2 and 0.4. A display device as described in claim 1, wherein the peak wavelength intensity ratio between the second light and the first light is between 0.5 and 0.7. A display device as claimed in claim 1, wherein the first light has a half-height width between 20nm and 30nm, the second light has a half-height width between 20nm and 30nm, and the third light has a half-height width between 35nm and 45nm. The display device as described in claim 1, wherein the first light-emitting chip, the second light-emitting chip and the third light-emitting chip are blue light-emitting diodes. A display device as described in claim 4, wherein the second light-emitting unit further includes a first conversion layer under the green color filter and converts blue light into green light, and wherein the third light-emitting unit further includes a second conversion layer under the red color filter and converts blue light into red light. A display device as described in claim 1, wherein the first light-emitting chip is a blue light-emitting diode, the second light-emitting chip is a green light-emitting diode, and the third light-emitting chip is a red light-emitting diode. The display device as described in claim 1 further includes a liquid crystal module located between the first light-emitting chip and the blue color resistor, between the second light-emitting chip and the green color resistor, and between the third light-emitting chip and the red color resistor. A liquid crystal display device comprises: a backlight module; a liquid crystal layer located above the backlight module; and a filter located above the liquid crystal layer, wherein the light incident on the filter comprises a first light with a peak wavelength between 459nm and 469nm, a second light with a peak wavelength between 527nm and 537nm, and a third light with a peak wavelength between 639nm and 649nm, wherein the filter comprises: a blue color resist having a first blue chromaticity (B _x ) between 0.141 and 0.151 and a second blue chromaticity (B y ) between 0.033 and 0.043 under a standard C light source; a green color resist having a first green chromaticity (G _x ) between 0.141 and 0.151 and a second blue chromaticity (B _y ) between 0.033 and 0.043 under a standard C light source; ) is between 0.151 and 0.171 and a second green chromaticity (G _y ) is between 0.745 and 0.755; and a red color resist having a first red chromaticity (R _x ) between 0.692 and 0.698 and a second red chromaticity (R _y ) between 0.302 and 0.308 under standard C light source. The liquid crystal display device as described in claim 8, wherein the backlight module includes a side-entry light-emitting diode, and the light incident on the filter is a mixture of the first light, the second light, and the third light.

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