Reflective display, light source device and white light source thereof

Abstract

A reflective display, a light source device and a white light source thereof, wherein the light source device is used to generate illumination light and comprises a plurality of light-emitting elements, at least one first fluorescent portion and at least one second fluorescent portion. Each light-emitting element is used to emit light. The first fluorescent portion is disposed on at least one of the light-emitting elements and can convert the light into a first white light having a first color temperature. The second fluorescent portion is disposed on at least one of the other light-emitting elements and can convert the light into a second white light having a second color temperature. The illumination light comprises the first white light and the second white light, wherein the maximum difference between the first color temperature and the second color temperature is greater than or equal to 2000K, so that the illumination light is suitable for the reflective display, thereby helping to maintain or improve the image quality of the reflective display.

Description

Technical Field

[0001] The present invention relates to a display, a light source device and a light source thereof, and in particular to a reflective display, a light source device and a white light source thereof. Background Art

[0002] Existing reflective displays usually include a front light module and a reflective display panel, wherein the front light module emits white light and allows the white light to illuminate the display surface of the reflective display panel to help display images. The color temperature of the white light has a certain degree of influence on the image, especially the color image. The color temperature of white light has a lot of influence on the color image. Therefore, when the front light module emits white light with a suitable color temperature, it will help maintain or improve the image quality of the reflective display. Summary of the invention

[0003] At least one embodiment of the present invention provides a light source device to provide white light suitable for use in a reflective display.

[0004] Another embodiment of the present invention provides a white light source, which is used in the above light source device.

[0005] Another embodiment of the present invention provides a reflective display, which includes the above-mentioned light source device.

[0006] The light source device provided by at least one embodiment of the present invention is used to generate illumination light, and includes a plurality of light-emitting elements, at least one first fluorescent portion and at least one second fluorescent portion. Each light-emitting element is used to emit light. The first fluorescent portion is configured on at least one of the light-emitting elements, and is used to convert the light into a first white light, wherein the first white light has a first color temperature. The second fluorescent portion is configured on at least one of the other light-emitting elements, and is used to convert the light into a second white light, wherein the second white light has a second color temperature. The illumination light includes the first white light and the second white light, and the maximum difference between the first color temperature and the second color temperature is greater than or equal to 2000K.

[0007] In at least one embodiment of the present invention, the first fluorescent portion includes a first red fluorescent material, and the second fluorescent portion includes a second red fluorescent material, wherein the bandwidth of the first red fluorescent material is greater than the bandwidth of the second red fluorescent material.

[0008] In at least one embodiment of the present invention, the first fluorescent portion and the second fluorescent portion each further include a green fluorescent material.

[0009] In at least one embodiment of the present invention, the color temperature of the illumination light is between 4500K and 7000K.

[0010] In at least one embodiment of the present invention, the first color temperature and the second color temperature satisfy the following three mathematical formulas:

[0011] Xc=(X1+X2) / 2;

[0012] Yc=(Y1+Y2) / 2;

[0013] Zc=(Z1+Z2) / 2,

[0014] Among them, X1, Y1, and Z1 are tristimulus values ​​obtained by converting the first color temperature, X2, Y2, and Z2 are tristimulus values ​​obtained by converting the second color temperature, and Xc, Yc, and Zc are tristimulus values ​​obtained by converting the predetermined color temperature.

[0015] In at least one embodiment of the present invention, the predetermined color temperature is 6500K.

[0016] At least one embodiment of the present invention provides a white light source comprising the above-mentioned light-emitting element, the above-mentioned green fluorescent material, the above-mentioned first red fluorescent material and the above-mentioned second red fluorescent material. The light-emitting element is used to emit light, wherein the light passing through the green fluorescent material and the first red fluorescent material has a first color temperature, and the light passing through the green fluorescent material and the second red fluorescent material has a second color temperature. The maximum difference between the first color temperature and the second color temperature is greater than or equal to 2000K.

[0017] In at least one embodiment of the present invention, the color temperature of the illumination light generated by the light emitting element is between 4500K and 7000K.

[0018] In at least one embodiment of the present invention, the light emitting element further includes a third red fluorescent material, wherein the light passing through the green fluorescent material and the third red fluorescent material has a third color temperature, and the third color temperature is between the first color temperature and the second color temperature.

[0019] At least one embodiment of the present invention provides a reflective display comprising a reflective display panel and a light source device. The light source device is used to generate illumination light, and the illumination light is incident on the reflective display panel. The light source device comprises the plurality of light-emitting elements, the first fluorescent portion, and the second fluorescent portion.

[0020] In at least one embodiment of the present invention, the reflective display further comprises a light guide plate. The light guide plate is disposed on the reflective display panel and has a light incident surface and a light emitting surface connected to the light incident surface, wherein the light source device is disposed on the light incident surface, and the light emitting surface faces the reflective display panel. The illumination light is incident on the light incident surface and emitted from the light emitting surface.

[0021] In at least one embodiment of the present invention, the reflective display panel includes an active device array substrate, a color filter substrate and a display medium layer. The display medium layer is located between the active device array substrate and the color filter substrate, wherein the color filter substrate is located between the display medium layer and the light guide plate.

[0022] Another embodiment of the present invention provides a reflective display comprising the reflective display panel and a light source device. The light source device is used to generate illumination light, and the illumination light is incident on the reflective display panel. The light source device comprises the plurality of light-emitting elements and a plurality of fluorescent parts. The fluorescent parts are respectively arranged on the light-emitting elements, and each fluorescent part comprises the green fluorescent material, the first red fluorescent material and the second red fluorescent material.

[0023] Based on the above, by using at least one fluorescent portion (such as the fluorescent portion mentioned above, or the first fluorescent portion and the second fluorescent portion), illumination light suitable for use in a reflective display can be generated, thereby helping to maintain or improve the image quality of the reflective display. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1A is a schematic top view of a reflective display according to at least one embodiment of the present invention;

[0025] Figure 1B yes Figure 1A A schematic cross-sectional view drawn along the line 1B-1B;

[0026] Figure 1C yes Figure 1A A cross-sectional schematic diagram of the first white light source in;

[0027] Figure 1D yes Figure 1A A cross-sectional schematic diagram of a second white light source in;

[0028] Figure 2A yes Figure 1C The spectrum of the first white light in ;

[0029] Figure 2B yes Figure 1D Spectrum diagram of the second white light in;

[0030] Figure 2C is a schematic diagram of a broken line showing color saturation relative to color temperature of a reflective display according to at least one embodiment of the present invention;

[0031] Figure 2D There is a chromaticity diagram with color temperatures ranging from 3700K to 9700K;

[0032] Figure 3A is a schematic top view of a reflective display according to another embodiment of the present invention;

[0033] Figure 3B yes Figure 3A Schematic diagram of the cross section of the white light source.

[0034]

Explanation of symbols

[0035] 100, 300: Light source device

[0036] 101: The first white light source

[0037] 102: Second white light source

[0038] 110: Light emitting element

[0039] 111: First fluorescent part

[0040] 111a: Transparent package

[0041] 111g: Green fluorescent material

[0042] 111r: The first red fluorescent material

[0043] 112: Second light emitting unit

[0044] 112r: Second red fluorescent material

[0045] 113r: The third red fluorescent material

[0046] 118: Package carrier

[0047] 119: Light-emitting chip

[0048] 200, 400: Reflective display

[0049] 210: Reflective display panel

[0050] 211: Color filter substrate

[0051] 211f: filter layer

[0052] 212: Active component array substrate

[0053] 213: Display medium layer

[0054] 220: Light guide plate

[0055] 221: Light incident surface

[0056] 222: Light-emitting surface

[0057] 270: Optical adhesive

[0058] 280: Protective layer

[0059] 290: Touch panel

[0060] 301: White light source

[0061] 311: Fluorescent Department

[0062] A21: Display area

[0063] B11: Light

[0064] CT2: Straight Line

[0065] L1: Illumination light

[0066] WL1: First White Light

[0067] WL2: Second White Light

[0068] WL3: White Light DETAILED DESCRIPTION

[0069] In the following text, in order to clearly present the technical features of the present case, the dimensions (such as length, width, thickness and depth) of the elements (such as layers, films, substrates and regions, etc.) in the drawings will be enlarged in unequal proportions. Therefore, the description and explanation of the embodiments below are not limited to the dimensions and shapes presented by the elements in the drawings, but should cover the dimensions, shapes and deviations of the two caused by the actual process and / or tolerances. For example, the flat surface shown in the drawings may have rough and / or nonlinear features, and the acute angles shown in the drawings may be rounded. Therefore, the elements presented in the drawings of the present case are mainly for illustration, and are not intended to accurately depict the actual shape of the elements, nor are they used to limit the claims of the present case.

[0070] Secondly, the words "about", "approximately" or "substantially" that appear in the content of this case not only cover the numerical values ​​and numerical ranges that are clearly recorded, but also cover the permissible deviation range that can be understood by those with ordinary knowledge in the technical field to which the invention belongs, wherein the deviation range can be determined by the error generated during measurement, and the error is caused by the limitations of the measurement system or process conditions. For example, two objects (such as the planes or traces of the substrate) are "substantially parallel" or "substantially perpendicular", wherein "substantially parallel" and "substantially perpendicular" respectively represent that the parallelism and perpendicularity between the two objects may include non-parallelism and non-perpendicularity caused by the permissible deviation range.

[0071] In addition, "approximately" may mean within one or more standard deviations of the above values, such as ±30%, ±20%, ±10% or ±5%. In this text, the words "approximately", "approximately" or "substantially" may be used to select acceptable deviation ranges or standard deviations according to optical properties, etching properties, mechanical properties or other properties, rather than applying a single standard deviation to all properties such as the above optical properties, etching properties, mechanical properties and other properties.

[0072] Figure 1A is a schematic top view of a reflective display according to at least one embodiment of the present invention, and Figure 1B yes Figure 1A A schematic cross-sectional view of the section along line 1B-1B. Figure 1A and Figure 1B The reflective display 200 includes a light source device 100 and a reflective display panel 210 , wherein the light source device 100 can generate an illumination light L1 , and the illumination light L1 is incident on the reflective display panel 210 to help the reflective display 200 display an image.

[0073] The reflective display panel 210 includes a color filter substrate 211, an active device array substrate 212, and a display medium layer 213, wherein the display medium layer 213 is located between the active device array substrate 212 and the color filter substrate 211. The color filter substrate 211 may have a plurality of different filter layers 211f, which may be a plurality of red filter layers, a plurality of green filter layers, and a plurality of blue filter layers, and these filter layers 211f may be arranged in a matrix. When the illumination light L1 is incident on the reflective display panel 210, the illumination light L1 will penetrate these filter layers 211f to form red light, green light, and blue light.

[0074] The active device array substrate 212 has a plurality of active devices (not shown) and a plurality of pixel electrodes (not shown), wherein the active devices are electrically connected to the pixel electrodes respectively, and the active devices may be thin film transistors (TFT). The reflective display panel 210 may be an electrophoretic display panel (EPD), wherein the display medium layer 213 may include a plurality of microcups and electrophoretic ink contained in the microcups. The active devices can control the voltage input to the electrodes to generate an electric field in the display medium layer 213, thereby controlling the electrophoretic ink in the display medium layer 213, so that the reflective display 200 can display images.

[0075] The reflective display 200 may further include a light guide plate 220. The light guide plate 220 is disposed on the reflective display panel 210, and the color filter substrate 211 is located between the display medium layer 213 and the light guide plate 220. Figure 1B For example, the reflective display 200 may further include at least one optically clear adhesive (OCA) 270, wherein a layer of the optical adhesive 270 is located between the light guide plate 220 and the color filter substrate 211, so that the light guide plate 220 can be disposed and fixed on the reflective display panel 210 through the optical adhesive 270. In addition, the light guide plate 220 has a light incident surface 221 and a light emitting surface 222 connected to the light incident surface 221. Figure 1B For example, the light incident surface 221 may be a side surface of the light guide plate 220 , and the light exit surface 222 may be a bottom surface of the light guide plate 220 .

[0076] The light source device 100 is disposed on the light incident surface 221, and the light emitting surface 222 faces the reflective display panel 210. When the light source device 100 emits the illumination light L1, the illumination light L1 is incident on the light incident surface 221, so that the illumination light L1 enters the light guide plate 220. Afterwards, the illumination light L1 transmitted in the light guide plate 220 is emitted from the light emitting surface 222, so that the illumination light L1 can be incident on the reflective display panel 210, thereby helping the reflective display 200 to display an image.

[0077] The reflective display 200 may be a touch display, and may further include a touch panel 290, wherein the touch panel 290 is disposed on the light guide plate 220. For example, the reflective display 200 includes two layers of optical glue 270, and the two layers of optical glue 270 are respectively disposed on two opposite surfaces (including the light emitting surface 222) of the light guide plate 220, wherein one layer of the optical glue 270 is located between the light guide plate 220 and the touch panel 290, so that the touch panel 290 can be disposed and fixed on the light guide plate 220 through the optical glue 270.

[0078] The reflective display 200 may further include a protective layer (cover lens) 280 covering the touch panel 290, such as Figure 1B It should be noted that, in this embodiment, the reflective display 200 may include a touch panel 290 and a protective layer 280, but in other embodiments, the reflective display 200 may not include the touch panel 290 and the protective layer 280. In other words, the reflective display 200 may not have a touch function, and the reflective display 200 is not limited to include the touch panel 290 and the protective layer 280.

[0079] The light source device 100 includes at least one first white light source 101 and at least one second white light source 102. Figure 1A In the illustrated embodiment, the light source device 100 includes a plurality of first white light sources 101 and a plurality of second white light sources 102. However, in other embodiments, the number of first white light sources 101 included in the light source device 100 may be one, and the light source device 100 includes a plurality of second white light sources 102. Alternatively, the number of second white light sources 102 included in the light source device 100 may be one, and the light source device 100 includes a plurality of first white light sources 101. Therefore, the light source device 100 includes at least one first white light source 101 and at least one second white light source 102, and Figure 1A The number of the first white light sources 101 and the second white light sources 102 is not limited.

[0080] Each of the first white light sources 101 and each of the second white light sources 102 includes a light emitting element 110. In other words, each of the first white light sources 101 and the second white light sources 102 includes a light emitting element 110. Each of the first white light sources 101 also includes a first fluorescent portion 111, and each of the second white light sources 102 includes a second fluorescent portion 112. These first fluorescent portions 111 are respectively configured on a plurality of light emitting elements 110, and these second light emitting portions 112 are respectively configured on other plurality of light emitting elements 110. Since the light source device 100 includes at least one first white light source 101 and at least one second white light source 102, at least one first fluorescent portion 111 is configured on at least one of these light emitting elements 110, and at least one second fluorescent portion 112 is configured on at least one of the other light emitting elements 110.

[0081] The first white light source 101 can emit a first white light WL1, and the second white light source 102 can emit a second white light WL2. The first white light sources 101 and the second white light sources 102 can be arranged in a row, wherein the first white light sources 101 and the second white light sources 102 are arranged alternately, so that the first white light WL1 emitted by the first white light source 101 and the second white light WL2 emitted by the second white light source 102 can be uniformly mixed into an illumination light L1. The illumination light L1 can be incident on the display area A21 of the reflective display panel 210 to help the reflective display 200 display an image. In addition, the first white light sources 101 and the second white light sources 102 can be installed on the same circuit substrate (not shown), and the light source device 100 can be a light bar.

[0082] Figure 1C yes Figure 1A A cross-sectional diagram of the first white light source in FIG. Figure 1C In the same first white light source 101, the light emitting element 110 may include a package carrier 118 and at least one light emitting chip 119, wherein the light emitting chip 119 is, for example, a light emitting diode chip (LED Die), and the light emitting chip 119 may be mounted on the package carrier 118 by wire bonding or flip chip method. The first fluorescent portion 111 is disposed on the light emitting element 110, and covers and seals the light emitting chip 119.

[0083] The first fluorescent part 111 includes a transparent encapsulation body 111a, a first red fluorescent material 111r and a green fluorescent material 111g, wherein the first red fluorescent material 111r and the green fluorescent material 111g are distributed in the transparent encapsulation body 111a, and the transparent encapsulation body 111a can be made of a polymer material such as resin. Each light-emitting element 110 can emit a light B11, which is, for example, blue light, and each first fluorescent part 111 can convert the light B11 into a first white light WL1 having a first color temperature. In other words, the first white light WL1 is substantially the light B11 that passes through the green fluorescent material 111g and the first red fluorescent material 111r.

[0084] Figure 1D yes Figure 1A A cross-sectional diagram of the second white light source in FIG. Figure 1D The second white light source 102 is similar to the first white light source 101, and the main difference between the two is that the second fluorescent portion 112 included in the second white light source 102 is different from the first fluorescent portion 111. Specifically, although the second fluorescent portion 112 also includes a transparent encapsulation body 111a and a green fluorescent material 111g, the second fluorescent portion 112 also includes a second red fluorescent material 112r, but does not include any of the first red fluorescent material 111r, wherein the second red fluorescent material 112r is different from the first red fluorescent material 111r.

[0085] The second fluorescent portion 112 can convert the light B11 into a second white light WL2 having a second color temperature. In other words, the second white light WL2 is substantially the light B11 that has passed through the green fluorescent material 111g and the second red fluorescent material 112r. The second red fluorescent material 112r is different from the first red fluorescent material 111r, so that the first color temperature is significantly different from the second color temperature, wherein the maximum difference between the first color temperature and the second color temperature is greater than or equal to 2000K.

[0086] The maximum difference may be equal to the difference between the first color temperature and the second color temperature, wherein the first color temperature may be lower than the second color temperature. In addition, since the first white light WL1 and the second white light WL2 can be mixed into the illumination light L1, the illumination light L1 includes the first white light WL1 and the second white light WL2, wherein the color temperature of the illumination light L1 may be between 4500K and 7000K. For example, the color temperature of the illumination light L1 may be approximately 6500K.

[0087] Figure 2A yes Figure 1C The spectrum of the first white light in Figure 2B yes Figure 1D The spectrum of the second white light in . Figure 2A and Figure 2B ,from Figure 2A and Figure 2BIt can be seen that the spectra of the first white light WL1 and the second white light WL2 are obviously different, so the first color temperature of the first white light WL1 is obviously different from the second color temperature of the second white light WL2. In addition, in the red light spectrum range with a wavelength above 600 nanometers, Figure 2A The first white light WL1 shown has a wide spectrum, but Figure 2B The second white light WL2 shown has a narrower spectrum. Therefore, the bandwidth of the first red fluorescent material 111 r is greater than the bandwidth of the second red fluorescent material 112 r, so that the first color temperature of the first white light source 101 is lower than the second color temperature of the second white light source 102 .

[0088] Figure 2C is a schematic diagram of the color saturation relative to the color temperature of the reflective display of at least one embodiment of the present invention. Figure 1A and Figure 2C , Figure 2C The curve shown is obtained by measuring the color saturation (i.e., NTSC value) of the reflective display 200, and the measured reflective display 200 includes six first white light sources 101 and seven second white light sources 102, wherein the color temperature of the first white light sources 101 is between 3500K and 4000K, and the color temperature of the second white light sources 102 is between 9500K and 10000K.

[0089] exist Figure 2C In the figure, the Y-axis is the color saturation obtained by the above measurement, and the X-axis is the color temperature of the illumination light L1 emitted by the six first white light sources 101 and the seven second white light sources 102, wherein adjusting the current input to the first white light sources 101 and the second white light sources 102 can control the color temperature of the illumination light L1, which can be between 3700K and 9700K.

[0090] Figure 2D There is a chromaticity diagram with color temperatures ranging from 3700K to 9700K. Figure 2C and Figure 2D By adjusting the current input to the first white light source 101 and the second white light source 102, the color temperature of the illumination light L1 emitted by the light source device 100 can be controlled so that the color temperature of the illumination light L1 can be equal to Figure 2D The color temperature of any point on the straight line CT2 is, for example, 6500K, wherein the two end points of the straight line CT2 represent the color temperatures of 3700K and 9700K respectively, that is, the straight line CT2 is a line connecting the color temperatures of 3700K and 9700K.

[0091] For example, when the current ratio input to the first white light source 101 and the second white light source 102 is 3:5, the illumination light L1 mixed by the first white light WL1 and the second white light WL2 may have a color temperature of 6500K, wherein the color temperature of 6500K is suitable for application in the reflective display 200. In other words, irradiating the reflective display panel 210 with the illumination light L1 of 6500K color temperature helps maintain or improve the image quality of the reflective display 200. In addition, Figure 2C It can be known that when the color temperature of the illumination light L1 is between 4500K and 6500K, the reflective display 200 can have better color saturation.

[0092] It is worth mentioning that, in addition to adjusting the current input to the first white light source 101 and the second white light source 102, the color temperature of the illumination light L1 can also be controlled in other ways so that the color temperature of the illumination light L1 is suitable for application in the reflective display 200 (e.g., 6500K). Specifically, under the condition that the same current is input to the first white light sources 101 and the second white light sources 102, the appropriate first white light sources 101 and the second white light sources 102 can be selected according to the following three mathematical formulas to achieve a predetermined color temperature (e.g., 6500K).

[0093] Xc=(X1+X2) / 2;

[0094] Yc=(Y1+Y2) / 2;

[0095] Zc=(Z1+Z2) / 2.

[0096] The above X1, Y1, Z1 and X2, Y2, Z2 and Xc, Yc, Zc are all three stimulus values ​​in CIE 1931, wherein X1, Y1, Z1 are three stimulus values ​​obtained by converting the first color temperature, and X2, Y2, Z2 are three stimulus values ​​obtained by converting the second color temperature. Xc, Yc, Zc are three stimulus values ​​obtained by converting the above predetermined color temperature (e.g., 6500K). In addition, Y1 and Y2 can be the brightness values ​​of the first white light source 101 and the second white light source 102, respectively.

[0097] Under the condition that the predetermined color temperature (i.e., Xc, Yc, Zc) is known, as long as one of the first color temperature (i.e., X1, Y1, Z1) and the second color temperature (i.e., X2, Y2, Z2) is known, the other can be calculated through the above mathematical formula. For example, when the predetermined color temperature (i.e., Xc, Yc, Zc) and the second color temperature (i.e., X2, Y2, Z2) are known, the first color temperature (i.e., X1, Y1, Z1) can be calculated using the above three mathematical formulas. In this way, the light source device 100 can select a plurality of suitable first white light sources 101 and second white light sources 102, so that the first white light sources 101 and the second white light sources 102 receiving the same magnitude of current can emit illumination light L1 having a suitable predetermined color temperature, thereby helping to maintain or improve the image quality of the reflective display 200.

[0098] Figure 3A is a top view schematic diagram of a reflective display according to another embodiment of the present invention, and Figure 3B yes Figure 3A Schematic diagram of the cross section of the white light source in . Figure 3A and Figure 3B , the reflective display 400 is similar to the aforementioned reflective display 200. For example, the reflective display 400 has the same Figure 1B The cross-sectional structure shown may include a reflective display panel 210 , a light guide plate 220 , a protection layer 280 , a touch panel 290 and a light source device 300 .

[0099] The light source device 300 includes a plurality of white light sources 301, wherein each white light source 301 includes a light emitting element 110 and a fluorescent portion 311, and the fluorescent portions 311 are respectively disposed on the light emitting elements 110. Different from the first white light source 101 and the second white light source 102, each fluorescent portion 311 includes a transparent encapsulation body 111a, a green fluorescent material 111g, a first red fluorescent material 111r, and a second red fluorescent material 112r, wherein the green fluorescent material 111g, the first red fluorescent material 111r, and the second red fluorescent material 112r are distributed in the transparent encapsulation body 111a. Therefore, the white light WL3 emitted by the white light sources 301 has substantially the same color temperature, and the illumination light emitted by the light source device 300 also has substantially the same color temperature as the white light WL3, wherein the color temperature of the white light WL3 emitted by the white light source 301 may be between 4500K and 7000K.

[0100] In this embodiment, each fluorescent portion 311 further includes a third red fluorescent material 113r, wherein the light B11 passing through the green fluorescent material 111g and the third red fluorescent material 113r has a third color temperature, and the third color temperature is between the first color temperature of the first white light WL1 and the second color temperature of the second white light WL2. Therefore, among the first color temperature, the second color temperature and the third color temperature, the maximum difference between the maximum color temperature and the minimum color temperature is greater than or equal to 2000K.

[0101] Although the fluorescent portion 311 in this embodiment includes three red fluorescent materials: a first red fluorescent material 111r, a second red fluorescent material 112r, and a third red fluorescent material 113r, in other embodiments, the fluorescent portion 311 may include only two red fluorescent materials, namely, the first red fluorescent material 111r and the second red fluorescent material 112r. Figure 3B The number of types of red fluorescent materials included in the fluorescent portion 311 is not limited.

[0102] It is worth mentioning that when the fluorescent portion 311 includes more than three different red fluorescent materials, these red fluorescent materials can be individually matched with the green fluorescent material 111g and the light B11 to produce a variety of white lights, and these white lights have a maximum color temperature and a minimum color temperature, wherein the maximum difference between the maximum color temperature (e.g., the second color temperature) and the minimum color temperature (e.g., the first color temperature) is greater than or equal to 2000K, so that the light source device 300 generates illumination light with a suitable color temperature to help maintain or improve the image quality of the reflective display 400.

[0103] Although the present invention has been disclosed as above by way of embodiments, they are not intended to limit the present invention. A person having ordinary knowledge in the technical field to which the present invention belongs may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope defined in the attached claims.

Claims

1. A light source device, characterized in that: Used to generate an illumination light, and the light source device comprises: A plurality of light-emitting elements, wherein each of the light-emitting elements is used to emit a light; At least one first fluorescent portion, disposed on at least one of the plurality of light-emitting elements, and used for converting the light into a first white light, wherein the first white light has a first color temperature; and At least one second fluorescent portion is disposed on at least one of the other plurality of light-emitting elements and is used to convert the light into a second white light, wherein the second white light has a second color temperature, the illumination light includes the first white light and the second white light, and a maximum difference between the first color temperature and the second color temperature is greater than or equal to 2000K.

2. The light source device according to claim 1, characterized in that: The at least one first fluorescent portion includes a first red fluorescent material, and the at least one second fluorescent portion includes a second red fluorescent material. The bandwidth of the first red fluorescent material is greater than the bandwidth of the second red fluorescent material.

3. The light source device according to claim 2, characterized in that: The at least one first fluorescent portion and the at least one second fluorescent portion each further include a green fluorescent material.

4. The light source device according to claim 1, characterized in that: The color temperature of the illumination light is between 4500K and 7000K.

5. The light source device according to claim 1, characterized in that: The first color temperature and the second color temperature satisfy the following three mathematical formulas: Xc=(X1+X2) / 2; Yc=(Y1+Y2) / 2; Zc=(Z1+Z2) / 2, X1, Y1, and Z1 are tristimulus values ​​obtained by converting the first color temperature, X2, Y2, and Z2 are tristimulus values ​​obtained by converting the second color temperature, and Xc, Yc, and Zc are tristimulus values ​​obtained by converting a predetermined color temperature.

6. The light source device according to claim 5, characterized in that: The predetermined color temperature is 6500K.

7. A white light source, characterized in that: include: A light emitting element, used to emit light; A green fluorescent material; a first red fluorescent material, wherein the light passing through the green fluorescent material and the first red fluorescent material has a first color temperature; and A second red fluorescent material, wherein the light passing through the green fluorescent material and the second red fluorescent material has a second color temperature, wherein a maximum difference between the first color temperature and the second color temperature is greater than or equal to 2000K.

8. The white light source according to claim 7, characterized in that: The bandwidth of the first red fluorescent material is greater than the bandwidth of the second red fluorescent material.

9. The white light source according to claim 7, characterized in that: The color temperature of the white light emitted by the white light source is between 4500K and 7000K.

10. The white light source according to claim 7, characterized in that: The white light source also includes: A third red fluorescent material, wherein the light passing through the green fluorescent material and the third red fluorescent material has a third color temperature, and the third color temperature is between the first color temperature and the second color temperature.

11. A reflective display, characterized in that: include: a reflective display panel; as well as A light source device for generating an illumination light, wherein the illumination light is incident on the reflective display panel, and the light source device comprises: A plurality of light-emitting elements, wherein each of the light-emitting elements is used to emit a light; At least one first fluorescent portion, disposed on at least one of the plurality of light-emitting elements, and used for converting the light into a first white light, wherein the first white light has a first color temperature; and At least one second fluorescent portion is disposed on at least one of the other plurality of light-emitting elements and is used to convert the light into a second white light, wherein the second white light has a second color temperature, the illumination light includes the first white light and the second white light, and a maximum difference between the first color temperature and the second color temperature is greater than or equal to 2000K.

12. The reflective display according to claim 11, characterized in that: The reflective display further comprises: A light guide plate is arranged on the reflective display panel and has a light incident surface and a light emitting surface connected to the light incident surface, wherein the light source device is arranged on the light incident surface, and the light emitting surface faces the reflective display panel, and the illumination light is incident on the light incident surface and emitted from the light emitting surface.

13. The reflective display according to claim 12, characterized in that: The reflective display panel comprises: an active device array substrate; a color filter substrate; and A display medium layer is located between the active element array substrate and the color filter substrate, wherein the color filter substrate is located between the display medium layer and the light guide plate.

14. A reflective display, characterized in that: include: a reflective display panel; as well as A light source device for generating an illumination light, comprising: A plurality of light-emitting elements, wherein each of the light-emitting elements is used to emit a light; as well as A plurality of fluorescent portions are respectively disposed on the plurality of light-emitting elements, and each of the fluorescent portions includes a green fluorescent material, a first red fluorescent material and a second red fluorescent material, wherein the light passing through the green fluorescent material and the first red fluorescent material has a first color temperature, and the light passing through the green fluorescent material and the second red fluorescent material has a second color temperature, wherein a maximum difference between the first color temperature and the second color temperature is greater than or equal to 2000K.

15. The reflective display according to claim 14, characterized in that: The reflective display further comprises: A light guide plate is arranged on the reflective display panel and has a light incident surface and a light emitting surface connected to the light incident surface, wherein the light source device is arranged on the light incident surface, and the light emitting surface faces the reflective display panel, and the illumination light is incident on the light incident surface and emitted from the light emitting surface.

16. The reflective display according to claim 15, characterized in that: The reflective display panel comprises: an active device array substrate; a color filter substrate; and A display medium layer is located between the active element array substrate and the color filter substrate, wherein the color filter substrate is located between the display medium layer and the light guide plate.

17. The reflective display according to claim 14, characterized in that: Each of the fluorescent parts also includes: A third red fluorescent material, wherein the light passing through the green fluorescent material and the third red fluorescent material has a third color temperature, and the third color temperature is between the first color temperature and the second color temperature.

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