A device that displays the color of white light using microcrystalline glass panels and methods for adjusting the color of such light.

Abstract

Invention details;

Description

A white light color display device based on a glass-ceramic panel and a light color adjustment method thereof Technical Field

[0001] The present invention utilizes light color adjustment technology to perform white light color display on a display device composed of a microcrystalline glass panel and a light source. The fields involved include color mixing adjustment technology, spectral analysis technology, and white display technology in photometry. The application fields involved include but are not limited to stovetop display, curtain wall display, aerospace display, etc. Background Art

[0002] Modern glass-ceramics are widely used in aerospace, architectural decoration, furniture, consumer electronics, and other fields due to their excellent properties, such as high hardness, corrosion resistance, pressure resistance, impact resistance, non-water absorption, low dust absorption, and no radiation. Glass-ceramic panel display devices used in architectural decoration and furniture and living appliances often consist of a dark or brown, low-transparency tinted glass-ceramic panel sheet (substrate) and a signal light (light source). Glass-ceramic panels with signal lights often serve as display panels, which inform users of the device's operating status (on, standby, normal, abnormal, etc.), operating hours, and operating mode through the display panel. In furniture and living display devices (such as stovetops and freezers), small LED digital tubes are often used as lamps; in building curtain wall displays, LED panels, fluorescent lamps, or quantum dot panels are often used as lamps. Because the glass-ceramic panels used have the characteristic of visible light cutoff filtering, such displays can usually only transmit red and infrared light, making it difficult to meet users' diverse display needs.

[0003] White is the most difficult color to display in modern displays. It often requires the three primary colors of red, green, and blue to be mixed in equal proportions. For microcrystalline glass panels, displaying white is even more difficult. In terms of existing technology and implementation, there is only one solution: adding a filter or filter film between the microcrystalline glass panel and the light source for color display (see patent CN103250004B). This solution not only increases production costs and reduces the reliability and color rendering life of the display device, but more importantly, it sacrifices the light intensity of the light source, reduces the display effect of the device, and the color rendering is dim. The button contrast is low in a bright field with sufficient light, which brings inconvenience to customers and creates a safety hazard.

[0004] Summary of the Invention

[0005] The purpose of the invention is to provide a white light color display device based on a microcrystalline glass panel and a light color adjustment method thereof, using the display device to enhance the light power transmitted through the microcrystalline glass panel in a simple and reliable implementation form, maximize the intensity and spectral efficiency of the light fixture and make it appear white, and solve the technical problem of dim color display and high cost in the prior art by adding optical compensators such as filters or filter films between the light source and the microcrystalline glass panel.

[0006] The technical solutions of the present invention are as follows:

[0007] A white light color display device based on a glass-ceramic panel is provided, comprising a glass-ceramic panel and a light source. The glass-ceramic panel has a display surface. The light source is located on the non-display side of the glass-ceramic panel. The light source displays white light or white light with color difference on the display surface of the glass-ceramic panel. The chromaticity coordinate area W1 presented by the transmitted light of a CIE standard illuminant through the glass-ceramic panel in the CIE standard colorimetry system is determined by the following coordinates, as shown in Table 1:

[0008] xy0.680.310.710.290.650.340.630.360.610.38

[0009] 0.560.20.580.40.540.420.360.340.280.24

[0010] Table 1 Chromaticity coordinate area W1 of the transmitted light of the glass-ceramic panel

[0011] The light source transmits through the glass-ceramic panel to display white light. The white chromaticity coordinate area W2 is obtained according to the CIE whiteness formula and the color tolerance formula, and is determined by the following coordinates, see Table 2:

[0012] Color temperature Chromaticity coordinate x Chromaticity coordinate y 42000.400.4949500.360.4960300.310.4971500.270.47900000.230.43125700.190.39212700.170.34∞0.150.29∞0.130.23∞0.130.19∞0.140.15∞0.17 0.12∞0.210.13∞0.260.16∞0.300.18117300.330.1922200.370.2218100.420.2516700.480.2916700.510.3317800.530.3818800.540.4124300.500.4431300.460.47

[0013] Table 2 White chromaticity coordinate area W2 of the white light rendering device.

[0014] Preferably, the glass-ceramic panel has an average transmittance of no more than 7% in the visible light spectrum range of 380 nm to 780 nm.

[0015] Preferably, the spectrum of the light source has 1-4 intrinsic peaks, each intrinsic peak corresponds to a luminophore or luminescent material, and each intrinsic peak has a half-maximum spectral width of more than 10 nm in the spectrum.

[0016] Preferably, the light emitting device formed by the light source includes one of an LED device, a fluorescent device, and a quantum dot device.

[0017] The present invention also provides a method for adjusting the light color of any of the above-mentioned white light color display devices based on a microcrystalline glass panel, adjusting the optical parameters of the light source, including the intensity and the main wavelength spectral width, to adjust the spectral coverage range so that the white light emitted by the light source is transmitted through the microcrystalline glass panel and displayed in the white chromaticity coordinate area W2.

[0018] Preferably, the method is based on the law of complementary colors of Grassman's color mixing theory, and specifically comprises the following steps:

[0019] (1) Transmittance function of the glass-ceramic panel measured in a photometer i is the serial number of the glass-ceramic panel, and the chromaticity area W1 corresponding to the glass-ceramic panel is calculated using the stimulation formula and color matching function of the CIE standard chromaticity system;

[0020]

[0021]

[0022]

[0023]

[0024]

[0025]

[0026]

[0027] Among them, X i 、Y i 、Z i is the tristimulus value of the selected glass-ceramic panel, x i ,y i , z i is the chromaticity coordinate of the selected glass-ceramic panel, is the tristimulus value function in the CIE1931 standard colorimetric observation system, Δλ is the wavelength spacing, and λ is the wavelength;

[0028] For the chromaticity coordinates of any glass-ceramic panel within the chromaticity region W1 corresponding to the glass-ceramic panel, a tangent line is drawn through the chromaticity coordinate point of the glass-ceramic panel to the white chromaticity coordinate region W2. The intersection of the tangent line and the spectrum trajectory line in the chromaticity coordinate diagram is the chromaticity coordinate of the white complementary color of the light source that transmits white light through the glass-ceramic panel. The area enclosed by the tangent line and the spectrum trajectory line is the light color adjustment range W3 of the white light color display device.

[0029] (2) Select a white chromaticity coordinate point (u, v) in the white chromaticity coordinate area W2. The chromaticity coordinates of the glass-ceramic panel are known to be (x i ,y i ), then calculate the chromaticity coordinates (m i , n i ):

[0030]

[0031]

[0032] where x″ i (λ), y″ i (λ) are the second derivatives of the chromaticity-wavelength function of the glass-ceramic with respect to λ, n″ i (λ), m″ i (λ) are the second-order derivatives of the light source chromaticity-wavelength function with respect to λ, is the first derivative of the color matching function in the CIE1931 standard colorimetric observation system with respect to λ;

[0033] (3) Select the chromaticity coordinates (m i , n i ) of the light source, or by adjusting the optical parameters of the selected light source to adjust the chromaticity coordinates of the light source to (m i , n i ), so that the light source transmits through the chromaticity coordinate (x i ,y i ) The white light displayed on the display surface of the micro-ceramic glass panel is in the white chromaticity coordinate area W2, or can display white light with the white chromaticity coordinates of (u, v).

[0034] As an example, any point is selected in the chromaticity region W1 corresponding to the micro-ceramic glass panel or the chromaticity coordinate (x i ,y i), connected to the equal-energy white light point (0.333, 0.333) in the chromaticity coordinate diagram and extended, the dominant wavelength of the spectral color at any point (except the equal-energy white light point) on the line from the intersection of the extended line and the spectrum trajectory line to the equal-energy white light point (0.333, 0.333) is the dominant wavelength of the standard white light complementary color of the light source;

[0035] On the line between the intersection of the extended line and the spectrum trajectory line and the equal energy white light point (0.333, 0.333), the chromaticity coordinate is (m i , n i ) of the light source, by adjusting the optical parameters of the selected light source, the chromaticity coordinates of the light source are adjusted to (m i , n i ), so that the light source transmits through the chromaticity coordinate (x i ,y i ) can display white light with white chromaticity coordinates of (u, v).

[0036] Advantages of the present invention:

[0037] (1) The present invention only uses a light source and a microcrystalline glass panel as a white light color display device. Through light color adjustment technology, the spectral efficiency of the light source is maximized, and the light transmitted through the microcrystalline glass panel is corrected to make it appear white. The device structure is simple and reliable. Compared with another white light display solution (patent number CN201180059416.5), it does not require external light-shielding ink or filter compensator, the manufacturing process is simple, and the qualified rate is high. It can be suitable for a variety of application scenarios, especially for white display on stove tops, aerospace and other narrow space structures with high intensity white display scenarios;

[0038] (2) Compared with the white display scheme in the prior art patent (patent number CN201180059416.5), the present invention can maximize the use of the spectral efficiency (light intensity, spectral range, spectral width) of the light source under the same white light color rendering intensity, the device has low power consumption, high white light color temperature adjustability, large color tolerance, and can be suitable for various display scene requirements of small signal lights or display units. The proposed white area color temperature covers from 1670K to positive infinity, the color difference is less than 1.5, and can be used in bright and dark lighting (bright field lighting> 10cd / m 2 , dark field illumination <1cd / m 2 ) to display white well. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] FIG1 is a diagram showing the region of W1-W4 in Example 1;

[0040] FIG2 is a graph showing the spectral transmittance of 21 types of glass in Example 1;

[0041] FIG3 is a spectrum distribution diagram of the RGBA four-color lamp beads used in Example 2 at equal power;

[0042] FIG4 is a transmission spectrum distribution diagram of the glass-ceramic panel used in Example 2;

[0043] FIG5 is a spectrum distribution diagram of the RGBA four-color lamp beads used in the white light color rendering device of Example 2 when rendering white;

[0044] FIG6 is a chromaticity coordinate distribution diagram of the light source, the glass-ceramic panel, and the white light color rendering device in Example 2 when the white light color rendering device displays white;

[0045] FIG7 is a spectrum distribution diagram of the RGB three-color lamp beads used in Example 3 at equal power;

[0046] FIG8 is a transmission spectrum distribution diagram of the glass-ceramic panel used in Example 3;

[0047] FIG9 is a spectrum distribution diagram of the RGB three-color lamp beads used in the white light color rendering device of Example 3 when rendering white;

[0048] FIG10 is a chromaticity coordinate distribution diagram of the light source, the glass-ceramic panel, and the white light color rendering device in Example 3 when the white light color rendering device displays white;

[0049] FIG11 is a spectrum distribution diagram of the LED light source used in Example 4 at constant power;

[0050] FIG12 is a transmission spectrum distribution diagram of the glass-ceramic panel used in Example 4;

[0051] FIG13 is a spectrum distribution diagram of the LED light source used by the white light color rendering device in Example 4 when rendering white;

[0052] FIG14 is a chromaticity coordinate distribution diagram of the light source, the glass-ceramic panel, and the white light color rendering device in Example 4 when the white light color rendering device displays white;

[0053] FIG15 is a transmittance spectrum diagram of the microcrystalline glass panel before and after the filter compensator is attached in the comparative example. DETAILED DESCRIPTION

[0054] The present invention will be further described below with reference to the embodiments and drawings, but the scope of protection of the present invention should not be limited thereto.

[0055] Example 1

[0056] This embodiment uses light color adjustment technology to display white light on a display device composed of a microcrystalline glass panel and a light source. The chromaticity coordinates of the microcrystalline glass panel are used as known information. The light color is adjusted by adjusting the optical parameters of the light source to achieve the light source displaying white light on the display surface of the microcrystalline glass panel. The white light displayed on the display surface is in the white chromaticity coordinate area W2, and the chromaticity coordinates of the incident light on the non-display surface side are the intrinsic chromaticity coordinates of the light source, and are different from the chromaticity coordinates of the display surface.

[0057] The white light color display device is composed of a light source and a micro-ceramic glass panel. Black micro-ceramic glass with a visible light transmittance of no more than 7% is selected as the display panel. According to the CIE 1931 standard colorimetric observation system, "Methods of Representation of Color" (GB / T3977-2008), "Standard Illuminants and Geometric Conditions" (GB / T3978-2008), "Methods of Measurement of Object Color" (GB / T3979-2008), and "Architectural Glass, Determination of Visible Light Transmittance, Direct Solar Transmittance, Total Solar Transmittance, Ultraviolet Transmittance and Related Window Glass Parameters" (GB / T2680-94), a spectrophotometer was used to perform spectral characterization on the 21 micro-ceramic glass panels in the embodiment under experimental conditions such as a viewing angle of 1°-4° and a viewing field brightness greater than 10cd / m2, and the transmission spectrum power of the micro-ceramic glass panel was obtained. Where i=1, 2, 3, ..., 21 as shown in FIG2 .

[0058] According to the calculation method in the above standard, using calculation formulas (1-1) to (1-7), the chromaticity coordinates corresponding to the known micro-glass panel are calculated, and the chromaticity coordinates are within the chromaticity area W1;

[0059] The visible light transmittance and chromaticity coordinates of the 21 selected glass-ceramic panels are shown in Table 4:

[0060] i visible light transmittance chromaticity coordinate x i Chromaticity coordinate y i 16.710.58160.400520.690.64870.337831.350.64660.347840.850.63430.358553.690.61180.3808

[0061] 61.340.65370.34270.980.58540.401480.670.68010.311891.000.40920.3395101.730.35660.3413110.800.59270.3214120.220.63430.3355132.470.59730.346 3141.470.57910.3383150.740.65640.3409160.340.320.28170.090.6510.2899183.080.58430.3458190.950.640.3531200.340.60170.2286210.460.66510.2595

[0062] Table 4 Visible light transmittance and chromaticity coordinates of 21 types of glass-ceramic panels

[0063] It is known that the chromaticity coordinate area of ​​the micro-ceramic glass panel is W1. By adjusting the optical parameters of the light source, the light effect generated by the light source passing through the display surface of the micro-ceramic glass panel is achieved in the white chromaticity coordinate area W2.

[0064] The white tolerance of the light source transmitted through the display surface of the microcrystalline glass panel is between 0 and 1.5, and is calculated by the CIE whiteness calculation formula (3-1 to 3-4), where W is the whiteness and T is the light color index. W , Y is the stimulus value of white light, x, y are the chromaticity coordinates of white light, x n ,y n are the chromaticity coordinates of a completely diffuse reflector, which are 0.31006 and 0.31615 respectively:

[0065] W=Y+800(x n -x)+1700(y n -y) (3-1)

[0066] T W =1000(x n -x)-650(y n -y) (3-2)

[0067] 40<W<5Y-280 (3-3)

[0068] -4<T W <2 (3-4)

[0069] Among them, the color temperature T c Calculated by formulas (3-1) and (3-2):

[0070]

[0071]

[0072] Where A c Is the isochromatic temperature line T c The inverse of the slope of the straight line is obtained; the white chromaticity coordinate area W2 is obtained, and the light effect generated by the light source passing through the display surface of the micro-glass panel is in the white chromaticity area W2. W2 can be determined by the coordinates of the following Table 5:

[0073] Color temperature chromaticity coordinate x chromaticity coordinate y

[0074] 42000.400.4949500.360.4960300.310.4971500.270.4790000.230.43125700.190.39212700.170.34∞0.150.29∞0.130.23∞0.130.19∞0.140.15∞0.170.12∞0 .210.13∞0.260.16∞0.300.18117300.330.1922200.370.2218100.420.2516700.480.2916700.510.3317800.530.3818800.540.4124300.500.4431300.460.47

[0075] Table 5 Chromaticity range of white light color rendering device

[0076] Its center position is the chromaticity point of equal-energy white light, and its coordinates are (0.3333, 0.3333).

[0077] According to the American National Standard ANSI NEMA ANSLG C78.377-2008 (Chromaticity Index for Electric Solid-State Lighting Products), the white optimal color rendering chromaticity coordinate region W4 with a color temperature ranging from 2700K to ∞ is selected from the above-mentioned white coordinate region W2, as shown in Table 6. The corresponding white chromaticity coordinate region diagram is shown in Figure 1.

[0078]

[0079]

[0080]

[0081] Table 6 Optimal color rendering chromaticity coordinate area of ​​white display device

[0082] According to the white optimal color rendering chromaticity coordinate area W4 and the intrinsic chromaticity coordinate value of the glass, the chromaticity coordinate range of the LED is obtained as shown in Figure 1 and Table 7.

[0083] i chromaticity coordinate x i Chromaticity coordinate y i 10.15060.045020.15080.044930.15080.079440.15240.079450.15340.110660.15380.163470.15720.059380.16070.264390.16100.2578100.16100.2578110.16180.2 157120.16310.2576130.16610.2932140.16610.2932150.16620.2568160.16990.2742170.17380.2637180.18560.3393190.18560.3393200.18220.3047210.20270.3897

[0084] Table 7 Chromaticity coordinates of 21 LEDs

[0085] The chromaticity coordinates of the known micro-ceramic panel are selected in the chromaticity coordinate area W1 corresponding to the micro-ceramic panel, and are tangent to the white chromaticity area W2 to obtain the maximum intersection area range W3, which is the chromaticity coordinate range for light color adjustment of the light source.

[0086] The dominant wavelength or complementary wavelength is used to complement the color in the color circle to obtain a white color with a certain color difference. The intrinsic chromaticity coordinates of the light source are corrected by the light source controller to be within the maximum intersection area range W3, that is, the light effect produced by the light source passing through the display surface of the micro-glass panel is within the required specified white chromaticity coordinate area W2.

[0087] A light source is selected in the maximum intersection area range W3 and its chromaticity coordinates are measured. The chromaticity coordinates ensure that the light effect generated by the light source passing through the display surface of the micro-ceramic glass panel is within the required specified white chromaticity coordinate area W2.

[0088] In addition, preferably, an arbitrary point is selected in the chromaticity area W1 corresponding to the micro-ceramic panel or the chromaticity coordinates of the known micro-ceramic panel are selected, connected to the iso-energetic white light point (0.333, 0.333) in the chromaticity coordinate diagram and an extension line is drawn. The dominant wavelength of the spectral color at any point (except the iso-energetic white light point) on the line from the intersection of the extension line and the spectrum trajectory line to the iso-energetic white light point (0.333, 0.333) is the dominant wavelength of the standard white light complementary color of the light source;

[0089] The chromaticity coordinates of the light source are randomly selected on the line connecting the intersection of the extended line and the spectrum trajectory line to the equal-energy white light point (0.333, 0.333). By adjusting the optical parameters of the selected light source, the light source can be transmitted through the display surface of the micro-ceramic glass panel to display white light with the specified white chromaticity coordinates.

[0090] Example 2

[0091] This embodiment changes the light intensity ratio of the RGBA three-color lamp beads, thereby changing the color position of the device's color display, so that the four intrinsic peak light sources can be transmitted through the display surface of the micro-ceramic glass panel to display white light.

[0092] This embodiment provides a white light color display device based on a microcrystalline glass panel and an RGBA four-color LED light source, and realizes the display of white light by the RGBA four-color LED light source passing through the microcrystalline glass panel by adjusting the light intensity ratio of the RGBA four-color LED. The device used includes a microcrystalline glass panel and a light source composed of RGBA four-color LED lamp beads. The microcrystalline glass panel used has a display surface, and the light source is located on the non-display side of the microcrystalline glass panel. The spectrum of the light source under equal power is shown in Figure 3, and its chromaticity coordinates are (0.2941, 0.2363).

[0093] The spectrum of the light source used has 4 intrinsic peaks, each of which corresponds to a light-emitting lamp bead. The characteristic peak (dominant wavelength) of the red R lamp bead is 628nm, the half-height width is 618nm-637nm, a total of 19nm, and the corresponding color position at the maximum light intensity is (0.6852, 0.3088); the characteristic peak (dominant wavelength) of the green G lamp bead is 520nm, the half-height width is 504nm-540nm, a total of 36nm, and the corresponding color position at the maximum light intensity is (0.1783, 0 .7207); the characteristic peak (dominant wavelength) of the blue B lamp bead is 460nm, the half-height width is 450nm-472nm, a total of 22nm, and the corresponding color position at maximum light intensity is (0.1410, 0.0491); the characteristic peak (dominant wavelength) of the amber A lamp bead is 592nm, the half-height width is 581nm-602nm, a total of 21nm, and the corresponding color position at maximum light intensity is (0.5719, 0.4215); the color gamut of the RGBA light source is shown in Table 8:

[0094] Lamp color chromaticity coordinate x chromaticity coordinate y red R 0.68520.3088 green G 0.17830.7207 blue B 0.14100.0491 amber A 0.57190.4215

[0095] Table 8 Color gamut of RGBA four-color LED light source

[0096] The thickness of the microcrystalline glass panel used is in the range of 4 mm and is in the form of a thin layer; in the visible light spectrum range of 380 nm-780 nm, the average transmittance is 1.47%, and the spectrum diagram is shown in FIG4 , and its chromaticity coordinates are (0.5791, 0.3383), which is within the color region W1 of the microcrystalline glass panel.

[0097] At constant power, the light source used has chromaticity coordinates of (0.5045, 0.2989) after passing through the display surface of the micro-ceramic panel, appearing pink rather than white. According to the formula in the light color adjustment technology of Example 1, the chromaticity coordinates of the light source are calculated to be (0.2236, 0.3391). By changing the ratio of the lamp bead intensities, the spectrum of the light source is shown in Figure 5. The light passing through the micro-ceramic panel appears white, and the chromaticity coordinates of the transmitted light are (0.3077, 0.3248). Figure 6 shows the chromaticity coordinate distribution of the light source, glass, and device when the device displays white light. It can be seen from the figure that the white light displayed by the device is within the range of the optimal white area W4 in Example 1, the micro-ceramic panel is within the range of W1, and the selected four-color LED light source is within the range of W3.

[0098] In addition, preferably, the chromaticity coordinates (0.5791, 0.3383) of the micro-glass panel are connected to the isoenergetic white light point (0.333, 0.333) in the chromaticity coordinate diagram and an extension line is drawn. The dominant wavelength of the spectral color at any point (except the isoenergetic white light point) on the line from the intersection of the extension line and the spectral trajectory line to the isoenergetic white light point (0.333, 0.333) is the dominant wavelength of the standard white light complementary color of the light source;

[0099] The chromaticity coordinates of the light source are randomly selected on the line connecting the intersection of the extended line and the spectral trajectory line to the equal-energy white light point (0.333, 0.333). By adjusting the optical parameters of the selected light source, the chromaticity coordinates of the light source are adjusted to (0.2236, 0.3391) so that the display surface of the micro-ceramic glass panel with chromaticity coordinates (0.5791, 0.3383) can display white light with the specified white chromaticity coordinates (0.3077, 0.3248).

[0100] Example 3

[0101] This embodiment changes the light intensity ratio of the RGB three-color lamp beads, thereby changing the color position of the device's color display, so that the three intrinsic peak light sources can be transmitted through the display surface of the micro-ceramic glass panel to display white light.

[0102] This embodiment provides a white light color display device based on a microcrystalline glass panel and an RGB three-color LED light source, and by adjusting the light intensity ratio of the RGB three-color LED light source, the RGB three-color LED light source is transmitted through the microcrystalline glass panel to display white light. The device used includes a microcrystalline glass panel and a light source composed of RGB three-color LED lamp beads. The microcrystalline glass panel used has a display surface, and the light source is located on the non-display side of the microcrystalline glass panel. The spectral power diagram of the light source under equal power is shown in Figure 7, and its chromaticity coordinates are (0.1874, 0.2516) at this time.

[0103] The spectrum of the light source used has three intrinsic peaks, each of which corresponds to a light-emitting lamp bead. The characteristic peak (dominant wavelength) of the red R lamp bead is 625nm, with a half-height width of 617nm-632nm, a total of 15nm, and the corresponding color position at maximum light intensity is (0.6682, 0.3119); the characteristic peak (dominant wavelength) of the green G lamp bead is 525nm, with a half-height width of 493nm-542nm, a total of 39nm, and the corresponding color position at maximum light intensity is (0.1777, 0.7468); the characteristic peak (dominant wavelength) of the blue B lamp bead is 455nm, with a half-height width of 448nm-465nm, a total of 17nm, and the corresponding color position at maximum light intensity is (0.1474, 0.0351); the color gamut of the RGBA light source is shown in Table 9:

[0104] Lamp color chromaticity coordinate x chromaticity coordinate y red R 0.6682 0.3119 green G 0.1777 0.7468 blue B 0.1474 0.0351

[0105] Table 9 Color gamut of RGB three-color LED light source

[0106] The thickness of the microcrystalline glass panel used is 4.27 mm and is in a thin layer. In the visible light spectrum range of 380 nm-780 nm, the average transmittance is 2.451%. The spectrum diagram is shown in FIG8 , and its chromaticity coordinates are (0.5973, 0.3463), which is within the chromaticity region W1 of the microcrystalline glass panel.

[0107] At constant intensity, the light source used has chromaticity coordinates of (0.6057, 0.3484) after passing through the display surface of the glass-ceramic panel, appearing orange-red. According to the formula in the light color adjustment technology of Example 1, the chromaticity coordinates of the light source are calculated to be (0.2245, 0.3412). By changing the light source intensity ratio, the spectral power of the light source is shown in Figure 9. The light passing through the glass-ceramic panel appears white, and the chromaticity coordinates of the transmitted light are (0.3248, 0.3315). Figure 10 shows the chromaticity coordinate distribution of the light source, glass, and device when the device displays white light. As can be seen from the figure, the white light displayed by the device is within the optimal white area W4 in Example 1, the glass-ceramic panel is within the W1 range, and the selected three-color LED light source is within the W3 range.

[0108] In addition, preferably, the chromaticity coordinates (0.5973, 0.3463) of the micro-glass panel are connected to the isoenergetic white light point (0.333, 0.333) in the chromaticity coordinate diagram and an extension line is drawn. The dominant wavelength of the spectral color at any point (except the isoenergetic white light point) on the line between the intersection of the extension line and the spectral trajectory line and the isoenergetic white light point (0.333, 0.333) is the dominant wavelength of the standard white light complementary color of the light source;

[0109] The chromaticity coordinates of the light source are randomly selected on the line connecting the intersection of the extended line and the spectral trajectory line to the equal-energy white light point (0.333, 0.333). By adjusting the optical parameters of the selected light source, the chromaticity coordinates of the light source are adjusted to (0.2245, 0.3412) so that the display surface of the micro-glass panel with chromaticity coordinates (0.5973, 0.3463) transmitted by the light source can display white light with the specified white chromaticity coordinates (0.3248, 0.3315).

[0110] Example 4

[0111] In this embodiment, the spectral range of the blue LED doped with phosphor is used to change the color position of the device, so that the two characteristic peak light sources can be transmitted through the display surface of the micro-ceramic glass panel to display white light.

[0112] This embodiment provides a white light color display device based on a micro-ceramic glass panel and a two-color LED light source, and realizes that the two-color LED light source can display white light by transmitting through the micro-ceramic glass panel by adjusting the concentration of B+ phosphor. The device comprises a micro-ceramic glass panel and a light source composed of blue LED lamp beads and phosphor. The micro-ceramic glass panel has a display surface, and the light source is located on the non-display side of the micro-ceramic glass panel. The light source is added with yttrium aluminum garnet (YAG: Ce 3+ ) phosphor is added as shown in FIG11 , where the chromaticity coordinates are (0.2279, 0.2760), appearing white.

[0113] The spectrum of the light source used has two intrinsic peaks, which correspond to a light-emitting lamp bead and a fluorescent material. The light-emitting lamp bead is a blue LED lamp bead, whose characteristic peak (main wavelength) is 458nm, and the half-height width is 453nm-481nm, a total of 28nm. The characteristic peak (main wavelength) of the emitted light fluorescence is 535nm, and the half-height width is 505nm-580nm, a total of 75nm.

[0114] The thickness of the microcrystalline glass panel used is in the range of 3.95 mm and is in the form of a thin layer; within the visible light spectrum range of 380 nm-780 nm, the average transmittance is 0.8%, and the spectrum diagram is shown in FIG12 . Its chromaticity coordinates are (0.5927, 0.3214), which is within the range of the microcrystalline glass panel color region W1 described in claim 1.

[0115] After the light source used passes through the display surface of the microcrystalline glass panel used, its chromaticity coordinates are (0.2279, 2260), appearing blue. According to the formula in the light color adjustment technology of Example 1, the chromaticity coordinates of the light source are calculated to be (0.2176, 0.3405). By changing the concentration of phosphor doped in the encapsulated lamp bead sol, the spectrum of the light source at this time is shown in Figure 13. The light transmitted through the microcrystalline glass panel appears white, and the chromaticity coordinates of the transmitted light are (0.3262, 0.3311). Figure 14 shows the chromaticity coordinate distribution of the light source, glass, and device when the device displays white light. It can be seen from the figure that the white light displayed by the device is within the optimal white area W4 in Example 1, the microcrystalline glass panel is within the W1 range, and the selected LED light source is within the W3 range.

[0116] In addition, preferably, the chromaticity coordinates (0.5927, 0.3214) of the micro-glass panel are connected to the isoenergetic white light point (0.333, 0.333) in the chromaticity coordinate diagram and an extension line is drawn. The dominant wavelength of the spectral color at any point (except the isoenergetic white light point) on the line from the intersection of the extension line and the spectral trajectory line to the isoenergetic white light point (0.333, 0.333) is the dominant wavelength of the standard white light complementary color of the light source;

[0117] The chromaticity coordinates of the light source are randomly selected on the line connecting the intersection of the extended line and the spectral trajectory line to the equal-energy white light point (0.333, 0.333). By adjusting the optical parameters of the selected light source, the chromaticity coordinates of the light source are adjusted to (0.2176, 0.3405) so that the display surface of the micro-glass panel with chromaticity coordinates (0.5927, 0.3214) transmitted by the light source can display white light with the specified white chromaticity coordinates (0.3262, 0.3311).

[0118] Comparative Example

[0119] Selecting a glass-ceramic panel with i = 21, and using this LED spectrum to compare the solution of adding a filter film in patent CN 103250004 B, the transmittance spectra of the glass-ceramic panel before and after the filter compensator are attached are shown in Figure 15. This figure shows that adding a filter film or compensator reduces the transmittance of the glass-ceramic panel, allowing the glass-ceramic panel to maintain essentially the same transmittance for the red, green, and blue bands of white light. This allows the LED composed of RGB lamp beads to retain its original color after passing through the glass-ceramic panel. The present invention, on the other hand, achieves white light display by adjusting the light source color without reducing the transmittance of the glass-ceramic panel. Furthermore, no objects are added to the light source or display panel. Although both ultimately display white light, the chromaticity of the light source used is different.

[0120] In particular, the color display device and light color adjustment method are particularly suitable for displaying white on microcrystalline glass stove panels. Microcrystalline glass with relatively low light transmittance can be selected, and the transmittance is particularly preferably 0.2-3%. Without the need for external light-shielding ink, filter compensator and other means, the intensity and spectral efficiency of the light fixture can be maximized, the light power passing through the microcrystalline glass can be enhanced, and the white light displayed can be displayed with strong white light, and the device on the non-display side cannot be seen or is not easy to be seen.

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