WO2019174271A1

WO2019174271A1 - Display device

Info

Publication number: WO2019174271A1
Application number: PCT/CN2018/113876
Authority: WO
Inventors: 余新; 胡飞; 郭祖强; 顾佳琦; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2018-03-16
Filing date: 2018-11-05
Publication date: 2019-09-19
Also published as: CN110277040B; CN110277040A

Abstract

A display device (600) comprises a light source apparatus (610), an image data processing module (620), and a spatial light modulator (631). The light source apparatus (610) emits a first light and a second light. The image data processing module (620) receives original image data of an image to be displayed, the original image data of the image to be displayed being based on image data of a second colour gamut range and comprising original control signal values of m colours of each pixel, the second colour gamut range covering a first colour gamut range and having a part exceeding the first colour gamut range, and the image data processing module (620) also mapping the original control signal values of the m colours of each pixel of the original image data of the image to be displayed to m correction control signal values corresponding to the first light and n correction control signal values corresponding to the second light. The spatial light modulator (631) is used for time-modulating the first light and the second light on the basis of the m+n correction control signal values of each pixel to acquire an image light.

Description

display screen

Technical field

The present invention relates to the field of display technologies, and in particular, to a display device.

Background technique

The gamut generally refers to the spectral trajectory of visible light that can be seen by the human eye in nature. The area of the region formed by the visible spectral trajectory is the maximum gamut area that the human eye can see visible light. At present, projectors, displays, etc., which are composed of different display devices, use R, G, and B three primary color display devices to perform color reproduction and reproduction on images. In a specified chromaticity space, such as CIE1931xy chromaticity space, the triangle formed by the three primary colors R, G, and B of the display device is called the color gamut that the device can display. The larger the gamut space is, the more people feel the color. The brighter and more realistic the picture is, however, how to make the display device realize the display of a wider color gamut is an important technical subject in the industry.

Summary of the invention

In view of this, the present invention provides a display device that can realize a wider color gamut.

A display device comprising:

a light source device for emitting first light and second light, wherein the first light is used to modulate an image of a first color gamut, and the second light is used to modulate the first color together with the first light An image outside the domain range, the first light includes m color lights, and the second light includes n color lights of m color lights, m is greater than or equal to n;

An image data processing module, configured to receive original image data of an image to be displayed, the original image data of the image to be displayed is image data based on a second color gamut range and includes original control signal values of m colors of each pixel, The second color gamut range covers the first color gamut range and has a portion exceeding the first color gamut range, and the image data processing module is further configured to use each pixel of the original image data of the image to be displayed The original control signal values of the m colors are mapped to the correction control signal values of the m+n colors to obtain corrected image data of the image to be displayed, in which the m+n colors of the pixels are corrected. The control signal value includes m+n correction control signal values respectively corresponding to the m color lights of the first light and the n color lights corresponding to the second light;

a spatial light modulator, configured to time-modulate a corresponding color light of the first light and the second light according to a correction control signal value of m+n colors of each pixel in a modulation time of the image To get the image light.

Compared with the prior art, in the display device of the present invention, since the second light is added, and the original image data of the image is also converted into m correction control signals respectively corresponding to the first light and the second light a value and n correction control signal values, and then modulating the first light and the second light according to the m+n correction control signal values to obtain image light, thereby realizing display of image data of a wide color gamut Moreover, the accurate restoration of the displayed image can be ensured, and the color gamut of the display device is wider and the display effect is better.

DRAWINGS

Figure 1 is a gamut range comparison diagram of several display devices employing different light sources.

2 is a schematic view showing the structure of a light source of a display device.

3 is a schematic view showing the structure of a light source of another display device.

4a and 4b are schematic diagrams showing the color gamut range achieved by the display device shown in FIG. 2 and FIG. 3 by adding different ratios of pure color lasers.

5a and 5b are schematic diagrams of color gamut ranges achieved by a display device employing dynamic color gamut.

6 is a block schematic diagram of a display device in accordance with a preferred embodiment of the present invention.

7 is a schematic diagram of a color gamut range of the display device shown in FIG. 6.

Figure 8 is a timing chart of modulation of a spatial light modulator of the display device of Figure 6.

FIG. 9 is a schematic diagram showing the specific structure of the first embodiment of the display device shown in FIG. 6.

Figure 10 is a block diagram showing the structure of the wavelength conversion device shown in Figure 9.

Fig. 11 is a plan view showing the structure of the first beam splitting light element shown in Fig. 9.

FIG. 12 is a schematic diagram showing the specific structure of the second embodiment of the display device shown in FIG. 6.

FIG. 13 is a schematic diagram showing the control and display principle of the display device shown in FIGS. 9 and 10.

Figure 14 is a schematic diagram showing the technical color gamut and color volume expansion of the display device shown in Figure 6.

Main component symbol description

Display device 600

Light source device 610

Image data processing module 620

Light modulation device 630

First light source 611

Second light source 612

Excitation source 613

Wavelength conversion device 614

Laser source

615, 616

Spectrophotosynthetic elements

617a, 617b, 617c

Guiding element 618

First area 617d

Second area 617e

First fluorescent region 614a

Second fluorescent region 614b

Scattering area 614c

First laser area 614d

Second laser region 614e

Relay lens 662

Filter 661

Homogenizer 663

Spatial light modulator 631

Image synthesizer 640

Control chip 650

Lens 664

First gamut range F1

Second color gamut range F2

The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.

detailed description

The light sources of display devices such as laser projectors are generally classified into three categories, one is to excite phosphors of different colors by a short-wavelength laser to generate primary colors of red, green and blue primary colors. The other type directly uses red, green and blue three-color lasers as the three primary color light sources. The third type is the combination of the first two types. Generally, the blue laser light source excites the phosphor as a short-wavelength excitation source to generate red-green primary light, and itself acts as a blue primary light. Each of these three different implementation techniques has advantages and disadvantages. For the laser-excited phosphor or laser-fluorescence hybrid scheme, since the gallium nitride-based semiconductor blue laser has the characteristics of high efficiency, long life, and stable operation, the scheme of exciting the fluorescent pink wheel by using the blue semiconductor laser has long life and high efficiency. Stable equipment and low cost. However, due to the wide spectrum of phosphor-excited laser phospher, the color gamut of this scheme is relatively narrow. The display device generally using this technology can cover the complete sRGB color gamut, and can enhance the color gamut to reach the DCI-P3 color gamut by some enhancement processing, such as adding a narrowband optical filter to remove the yellow light spectrum in the green and red light. . However, narrowband filtering loses considerable brightness, which greatly reduces the efficiency of the display device. A display device using a pure RGB laser has a very wide color gamut because of its excellent monochromaticity. The display device using RGB laser (such as projection system) can easily reach the REC2020 color gamut standard. See Figure 1 for the color gamut comparison of the above several display devices.

However, RGB laser display devices (such as projectors) also have a number of disadvantages. The first is speckle. The speckle is due to the coherence of the laser, causing the light reflected on the display plane to interfere due to the phase difference caused by the undulation of the plane, resulting in unevenness in the luminance distribution of the display screen. Although many inventions have attempted to solve the problem of laser speckle, the results are not satisfactory. The second is the high cost of RGB laser display devices. This is because the red and green lasers in RGB laser display devices are still immature under current technology. The efficiency of the semiconductor green laser is currently only 20% or less, which is much lower than the blue laser of the gallium nitride substrate and the red laser of the ternary substrate, and the cost is high. Although the efficiency of the red laser is similar to that of the blue laser, the temperature stability of the red laser is poor, and the efficiency is significantly reduced not only with the increase of temperature, but also the center wavelength is also drifted. These two points make the RGB laser display device appear color cast with temperature changes. This requires adding a thermostat to the red laser to stabilize the operating state of the red laser, which also means that a high-power cooling device is required to ensure the stable operating temperature of the red laser, thereby greatly increasing the cost of the RGB laser display device.

A basic laser-excited phosphor wheel source 200 is shown in FIG. 2, and the short-wavelength visible light emitted by the light source 210 excites the phosphor on the color wheel 220 to produce a time-sequential primary or white light. Due to the wide spectrum of fluorescence, the gamut coverage based on this system is relatively narrow. An improved method of enhancing the color gamut is shown in FIG. The short-wavelength visible light emitted by the excitation light source 310 is converted into primary color light by the color wheel 320 and filtered by the sync filter device 330 to obtain a narrow-band color pure higher primary color light to expand the color gamut of the laser fluorescence. The filter device introduces additional optical power loss, which reduces the efficiency of the display device.

The color gamut of the light source can also be extended by incorporating a solid red and green laser into the laser fluorescence. An implementation scheme capable of incorporating a solid color laser in a laser fluorescence system as proposed in one technique, and an optical path implementation incorporating one or both of the techniques mentioned in the other technology. Although the incorporation of a solid color laser can extend the color gamut of the laser fluorescence, there is no modulation for the ratio of the display content to the light source, and the enhanced color gamut range is limited. As shown in Figure 4, based on the mixed gamut of a solid color laser (shown in Figure 4a) with a fluorescence intensity of 20%, if it is necessary to extend the color gamut of the laser fluorescence to the DCI-P3 standard, it is necessary to add A solid color laser (shown in Figure 4b) with a fluorescence intensity of 40% forms a mixed light. Compared to the fluorescence plus color filter scheme, the display device of this scheme is more efficient, but the need to add a high-power red-green laser leads to an increase in system cost.

In addition, a display device using a dynamic color gamut that dynamically adjusts the brightness of laser light and fluorescence by analyzing an image can also increase system efficiency. Since the picture always has a certain brightness, and the fluorescence and laser light are combined in front of the spatial light modulator to form a three-primary system, the blue primary color is from the blue laser, and the green primary color is from the green fluorescent and green laser. The ratio of the dynamic control signal to the combined light, the red primary color comes from the proportional combination of the red and red lasers. Since the maximum brightness of the picture is usually not zero, and the intensity of the fluorescence is set according to the maximum brightness of the picture, and the bright field information of the picture usually has a large amount of white light components, the method of dynamic color gamut cannot be fluorescent. The brightness is completely turned off, so the dynamic color gamut method cannot fully reach the color gamut of the Rec.2020 standard. Please refer to FIG. 5, which is a schematic diagram of the color gamut range that can be achieved by a display device using dynamic color gamut. 5a is a schematic diagram of the color gamut range that can be achieved by fluorescence incorporation of 20% red laser and green laser. Figure 5b is a schematic diagram of the color gamut range that can be achieved by fluorescence incorporation of 40% red and green lasers. See Figure 5a and Figure 5b is more difficult to fully meet the gamut range of the Rec.2020 standard.

Please refer to FIG. 6. FIG. 6 is a block diagram of a display device 600 according to a preferred embodiment of the present invention. The display device 600 includes a light source device 610, an image data processing module 620, a light modulation device 630, and an image synthesis device 640.

The light source device 610 is configured to emit first light and second light, the first light is used to modulate an image of a first color gamut range F1, and the second light is used to co-modulate the first light An image other than the first color gamut range F1, the first light includes m color lights, and the second light includes n color lights of m color lights, and m is greater than or equal to n. Specifically, the first light may also include fluorescence, m may be 3, and the first light includes three primary colors of light, such as red, green, and blue light, wherein the first light, the blue light It may be a laser, the green light and the red light are both fluorescent, and the fluorescence may be generated by a blue laser excited fluorescent material such as a red fluorescent material and a green fluorescent material; or a yellow fluorescent material. The second light may include red light and green light, and the red light and the green light may both be lasers, that is, n may be 2, and the two colors of the second light may be red laser and Green laser.

It can be understood that, as described above, the gamut of the first light can be displayed in the first gamut range F1. As shown in FIG. 7, the first gamut range F1 can be a DCI gamut range, such as a color. The domain range is DCI-P3. Therefore, if the image to be displayed is an image of the first color gamut range F1, the second light may be 0, and only the first light is modulated to display the image of the first color gamut range F1. . Further, in the first light, since the red light and the green light are fluorescent, and the second light includes a red laser and a green laser, the laser of the second light can exhibit a wide color gamut The color gamut in which the fluorescence in the first light can be displayed, in particular, the first light and the second light may together exhibit an image beyond the first color gamut, in particular, by modulation The red laser light in the first light and the red green laser in the second light may display an image in which the color gamut is located on the boundary line of the second color gamut F2 (in this case, the red and green fluorescence in the first light may be 0) The second color gamut range F2 covers the first color gamut range F1 and has a portion that exceeds the first color gamut range F1, and the second color gamut range F2 may be a REC gamut range, such as a color Domain range REC.2020; further, for the image of the boundary line of the color gamut of the first color gamut range F1 and the second color gamut range F2, the blue of the first light may be modulated Laser, red-green fluorescence and red-green laser in the second light are displayed together A blue laser light in the first, the second red and green fluorescence light in the red and green laser can not both 0.

The image data processing module 620 is configured to receive original image data of an image to be displayed, the original image data of the image to be displayed is based on the image data of the second color gamut range F2 and includes m colors of each pixel. The original control signal value, the image data processing module 620 is further configured to map the original control signal values of the m colors of the pixels of the original image data of the image to be displayed to the correction control signal values of the m+n colors. The corrected image data of the image to be displayed is obtained. Specifically, in the corrected image data, the correction control signal values of the m+n colors of each pixel include m correction control signal values corresponding to the first light and n correction control signals corresponding to the second light. value.

First, it can be understood that the original image data may adopt different encoding formats such as RGB encoding, YUV encoding, etc., wherein different encoding formats may correspond to different color spaces. In this embodiment, the original image data is mainly converted into The xyY gamut coordinates are calculated using the tristimulus values X, Y, Z of the color space defined by the CIE 1937 standard. Specifically, CIE 1937 defines a absolute color and color that can be resolved by any human eye in a three-dimensional vector. Brightness, which does not change with the transformation of the color gamut, so the obtained tristimulus values X, Y, Z of the pixel and the first correction control signal value according to the pixel can be calculated according to the original control signal value of the pixel And the principle that the third stimulation value X, Y, and Z of the pixel obtained by the second correction control signal value are equal, and the corresponding first correction control signal value and the second correction control signal are calculated according to the original control signal value of each pixel. value.

For example, the original control signal values of the m colors of each pixel are R, G, and B, and the m correction control signal values are r, g, and b, and the n correction control signal values are rl, Gl, the tristimulus value X, Y, Z of the pixel obtained according to the original control signal values R, G, B of the pixel and the correction control signal values r, g, b and rl, gl according to the pixel Calculating the principle that the obtained tristimulus values X, Y, and Z of the pixels are equal, the image data processing module maps the original control signal values R, G, and B of the respective colors of the original image data of the image to m The correction control signal values r, g, b, rl, gl of +n colors are used to obtain corrected image data of the image to be displayed.

Wherein, in the mapping process of converting the original control signal values R, G, B into correction control signal values r, g, b, rl, gl, the original control signal values R, G, B are known, By means of the mapping formula of the tristimulus value, an infinite number of solutions of r, g, b, rl, and gl can be obtained. At this time, it is guaranteed that r, g, b, rl, and gl can all be displayed on the display device from 0 to M. On the basis of the maximum gray scale range, the values of r, g, b, rl, and gl when rl ² + gl ^{2 are the} smallest are selected as the correction control signal values r, g, b, rl, gl, thereby obtaining The most suitable r, g, b, rl, gl values. At the same time, since the rl ² + gl ^{2 is the} smallest, it can be ensured that the rl and gl corresponding to the second light are small, so that the gamut of the image is displayed using the least second light, and the image is not accurately restored. It is also possible to reduce the use of the second light and reduce the cost of the light source.

Wherein, when the original image data is in the RGB encoding format, how to obtain the corresponding correction control signal values r, g, b, rl according to the original control signal values of the m colors of each pixel are R, G, and B. And gl for detailed explanation. Specifically, when the original image data is image data of an RGB encoding format, when the m colors are red, green, and blue, the original control signal values R, G, and B are respectively red original grayscale values R, green. An original grayscale value G and a blue original grayscale value B, wherein the first correction control signal value is r, g, and b, respectively, a red first corrected grayscale value r corresponding to the red fluorescence of the first light, corresponding to the first The green fluorescent green first corrected gray scale value g of the light, and the blue first corrected gray scale value b of the blue laser corresponding to the first light, wherein the second corrected control signal values rl and gl are respectively corresponding to the second light The red second corrected gray scale value rl of the red laser light, and the green second corrected gray scale value gl of the green laser corresponding to the second light. Further, in the display device, the original grayscale values R, G, B and the corrected grayscale values r, g, b, rl, and gl may all adopt a binary encoding format, such as an N-bit binary encoding. Then, the gray level M that can be displayed by each color of the display device corresponds to the number of bits N of the binary code, that is, the original gray scale values R, G, B and the corrected gray scale values r, g, b, Both rl and gl are in the range of [0 to M], where M=2 ^N -1. For example, when N=8, the gray level of the display device is 256, and the original grayscale values R, G, and B and the corrected grayscale values r, g, b, rl, and gl are both In the range of [0 to 255], where the grayscale value is 0, the color is completely turned off, and the grayscale value of 255 indicates that the color is displayed with the highest brightness.

Further, the RGB three primary colors are also different according to the gamut range of the original image data. In this embodiment, the original image data is image data of the second color gamut range F2, and the colors and brightness of the three primary colors r ₀ , g ₀ , b ₀ of the second color gamut range F2 are set in CIE 1937 color. The xyY gamut coordinates of the space satisfy the following formula 1.

It will be appreciated, the original image data, the color gamut of the second F2 is known, the r _{_0,} g _0, b xyY color space coordinate ₀ are also known. When the second color gamut range is the REC 2020 color gamut range, the xyY color gamut coordinates of the r ₀ , g ₀ , and b ₀ in the CIE 1937 color space are respectively (0.708, 0.292, 0.2627), (0.17, 0.797). , 0.6780), (0.131, 0.046, 0.0593).

Further, when the original gray scale value (R, G, B) of each color of each pixel is converted into a tristimulus value (X, Y, Z) in the CIE 1937 color space, the tristimulus value (X) , Y, Z) satisfy the following formula 2.

Wherein, in Formula 2, as described above, M is the gray level of the display device. Further, according to the xyY color gamut coordinates (refer to Formula 1) of the three primary colors r ₀ , g ₀ , and b ₀ of the second color gamut range, the matrix C satisfies the following formula 3.

Further, since the display device of the present invention uses a five-primary color system of m color light of the first light and n color lights of the second light, the five primary colors r ₀ , g ₀ , b ₀ , rl ₀ , and gl ₀ represents color and luminance of red fluorescence in the first light, green fluorescence in the first light, blue laser in the first light, red laser in the second light, and green laser in the second light, respectively. The base colors r ₀ , g ₀ , b ₀ , rl ₀ , and gl ₀ satisfy the following formula 4 in the xyY color gamut coordinates in the CIE 1937 color space.

It can be understood that any color brightness in the CIE space may be formed by combining the five primary colors of light according to the brightness ratio, and the five primary colors r ₀ , g ₀ , b ₀ , rl ₀ , and gl ₀ may also be It is known to be determined according to the first light and the second light emitted by the light source device 610. Further, the tristimulus values X, Y, Z of the pixel obtained according to the original grayscale values R, G, B of each pixel and the first corrected grayscale values r, g, b according to the pixels and The second corrected gray scale values rl, gl are calculated by the principle that the tristimulus values X, Y, and Z of the pixels are equal, and the corrected gray scale values r, g, b, rl, and gl satisfy the following formula 5.

Further, according to Formula 4, the conversion matrix C' satisfies the following Formula 6.

Since the tristimulus values X, Y, Z can be calculated according to the original image data, the conversion matrix C' can also be obtained according to the five primary colors r ₀ , g ₀ , b ₀ , rl ₀ , and gl ₀ , and therefore, according to In the formula 5, the corrected grayscale values r, g, b, rl, gl actually have an infinite number of solutions. In order to realize the corrected gray scale values r, g, b, rl, gl corresponding to the unique five primary colors, an additional limit needs to be added to solve the corrected gray scale values r, g, b, rl, gl.

Specifically, in one embodiment, the brightness of two of the gray scale values r, g, b, rl, and gl may be randomly specified, and the values of the other three quantities are obtained. It should be noted that the values of the five control signals are between 0 and 255. The two randomly selected values may cause the remaining three values to be out of the range of values, so the method of random selection is not the most A preferred embodiment. In another embodiment, the sum of the squares of the luminances of the red and green lasers can be minimized to the minimum rl ² + gl ² , that is, min(rl ² + gl ² ).

First, we can transform equation (5) into the following formula 7.

Among them, the parameters A and B respectively satisfy the following formulas 8 and 9.

Further, in order to solve r, g, b, rl, gl, and transform Equation 7, the following formula 10 can be obtained.

Further, in order to minimize rl ² + gl ² , that is, the demand solution min(rl ² + gl ² ), that is, the demand solution

A function f(rl, gl) is defined, wherein the function f(rl, gl) satisfies the following formula 11.

Further, to solve the function f(rl, gl), the partial differentiation of the r, g, b can be made.

Minimal, that is, the partial differential of r, g, b

The following formula 12 is satisfied.

Further, by rewriting the matrix in Equation 10, the following Equation 13 can be obtained.

The formula 12 can be rewritten as the following formula 14.

Wherein, according to the formula 13, the parameters D and d respectively satisfy the following formula 15 and formula 16.

Equation 13 is obtained by matrix rewriting, since the parameters A and B can be calculated by the gamut coordinates xyZ of the five primary colors r ₀ , g ₀ , b ₀ , rl ₀ , and gl ₀ of formula 4 and the tristimulus value XYZ of the formula 2, Therefore, the parameter T and its parameters t11, t12, t13, t14, t21, t22, t23, t24 can be known, and the parameter numbers t11, t12, t13, t14, t21, t22, t23, t24 are further substituted into the formula 15 and the formula. 16, the values of the parameters D and d can be obtained, thereby obtaining the first corrected gray scale values r, g, b, and then the values of r, g, b are brought into the formula 7 to obtain the second corrected gray scale values rl and gl. Value. If the color brightness of the color exceeds the range that can be represented by the five primary color gamut, the grayscale value of the five primary colors may exceed the range of values, and a simple truncation may be performed. Specifically, the grayscale value exceeding M is replaced by M. Grayscale values below 0 are replaced by zeros.

As can be seen from the above description, after receiving the original image data of the image, the image data processing module 620 converts the original control signal values R, G, and B of the m colors of each pixel into corresponding correction control signal values r, The corrected image data is obtained by g, b, rl, gl, and the image data processing module 620 also supplies the corrected image data to the light modulating device 630.

The light modulating device 630 is configured to receive the corrected image data, modulate the first light and the first light according to m+n correction control signal values r, g, b, rl, gl of each pixel of the corrected image data. Two light obtains image light.

In this embodiment, the light modulating device 630 includes a spatial light modulator 631, and the spatial light modulator is configured to time-separate the correction control signals according to the m+n colors of the pixels in a modulation time of the image. A value modulates a corresponding color light of the first light and the second light to obtain image light. The image light generated by the light modulating device 630 can display the image via the image combining device 640 and/or the lens. It can be understood that the spatial light modulator 631 can be a DMD spatial light modulator, a Lcos spatial light modulator, an LCD spatial light modulator, or the like.

In an embodiment, the m may be 3, the n may be 2, the first light includes first color light, second color light, and third color light, and the second light includes first Color light and second color light, as described above, the correction control signal value includes a correction control signal value r corresponding to the first color light of the first light, and a second color light corresponding to the first light a correction control signal value g, a control signal value b corresponding to the third color light of the first light, a correction control signal value rl corresponding to the first color light of the second light, and a corresponding to the second light The correction control signal value gl of the two color lights. The first spatial light modulator 631 is configured to sequentially modulate the first color light of the first light according to the correction control signal value r corresponding to the first color light of the first light, according to the corresponding The correction control signal value g of the second color light of the first light modulates the second color light of the first light, and modulates the first light according to the correction control signal value b corresponding to the third color light of the first light a third color light, modulating the first color light of the second light according to a correction control signal value rl corresponding to the first color light of the second light, according to the second color according to the corresponding second light The light correction control signal value gl modulates the second color light of the second light. The first color light, the second color light, and the third color light may be red light, green light, and blue light in sequence, and the first color light, the second color light, and the third color of the first light. The lights are red, green and blue. The first color light and the second color light of the second light are respectively a red laser light and a green laser light.

Please refer to FIG. 8. FIG. 8 is a timing chart of modulation of a spatial light modulator of the display device of FIG. The modulation time T1 of the image is divided into a first time period t1, a second time period t2, a third time period t3, a fourth time period t4, and a fifth time period t5, which are not overlapped with each other, the spatial light The modulator is configured to modulate the first color light of the first light according to the correction control signal value r of the first color light corresponding to the first light during the first time period t1, in the second time period T2 modulating the second color light of the first light according to the correction control signal value g corresponding to the second color light of the first light, and according to the third time of the first light in the third time period t3 a correction light control signal value b corresponding to the color light modulating the third color light of the first light to generate the image light, and correcting control according to the first color light corresponding to the second light in the fourth time period t4 The signal value rl modulates the first color light of the second light, and modulates the second light according to the correction control signal value gl of the second color light corresponding to the second light in the fifth time period t5 The second color of light. In the embodiment, the first time period t1, the second time period t2, and the third time period t3 are all greater than the fourth time period t4 and the fifth time period t5. Specifically, the fourth time period t4 and the fifth time period t5 are equal, the first time period t1, the second time period t2, and the third time period t3 are equal, and the first The time period t1 is twice the fourth time period t4.

Please refer to FIG. 9. FIG. 9 is a schematic diagram showing the specific structure of the first embodiment of the display device 600 shown in FIG. Specifically, the light source device 610 includes a first light source 611 for emitting the first light, and a second light source 612 for emitting the second light. The first light source 611 includes an excitation light source 613 that emits excitation light, and a wavelength conversion device 614 that emits fluorescent light and that is configured to receive the excitation light and emit the first light. The first light includes fluorescence, the second light source 612 includes a laser light source, and the second light includes a laser light. In this embodiment, the excitation light source 613 is a laser light source, the excitation light is a blue laser, and the wavelength conversion device 614 is configured to receive the excitation light and convert a part of the excitation light into the fluorescence, And using another portion of the excitation light and the fluorescence as the first light, and another portion of the excitation light is a third color light of the first light, the fluorescence comprising red fluorescence and green fluorescence The red fluorescent light is a first color light of the first light, and the green fluorescent light is a second color light of the first light; the second light source 612 includes a red laser light source 615 that emits a red laser light and emits a green laser light source 616 of green laser, the second light comprising a red laser and a green laser, the red laser being a first color light of the second light, and the green laser being a second color of the second light Light.

Referring to FIG. 10, the wavelength conversion device 614 includes a first fluorescent region 614a having a first fluorescent material (such as a red fluorescent material) and emitting first color light of the first light, and having a second fluorescent material ( a second fluorescent region 614b for emitting a second color light of the first light, a scattering region 614c corresponding to the third color light of the first light, and a second light source 612 for receiving a first laser region 614d of the first color light of the second light and a first color light of the second light, and a second color light of the second light emitted by the second light source 612 And emitting a second laser region 614e of the second color of the second light, the first fluorescent region 614a, the second fluorescent region 614b, the scattering region 614c, the first laser region 614d, and The second laser regions 614e are arranged in a circumferential direction, and the wavelength conversion device 614 rotates in the circumferential direction during operation to emit the first color light of the first light in a time division time T1 of the image, The second color of the first light, The third color light of said first light, the second color light of the first color light of the second light, the second light.

The display device 600 further includes a control chip 650, the control chip 650 controls the illumination timing of the excitation light source 613, the illumination timing of the second light source 612, the rotational speed and the rotational position of the wavelength conversion device 614, The modulation timing of the spatial light modulator 631 is such that the illumination timing of the excitation light source 613, the illumination timing of the second light source 612, the rotational speed and rotational position of the wavelength conversion device 614, and the spatial light modulator 631 The modulation timing is matched.

In the embodiment shown in FIG. 9, the wavelength conversion device 614 is a transflective wavelength conversion device, and the first laser region 614d and the second laser region 614e are both transmissive regions, the first The fluorescent region 614a, the second fluorescent region 614b, and the scattering region 614c are all reflective regions, and the excitation light source 613 is located at a first side of the wavelength conversion device 614, and the excitation light emitted by the excitation light source 613 The first fluorescent region 614a, the second fluorescent region 614b, and the scattering region 614c are sequentially supplied. The first fluorescent region 614a generates a first color light of the first light and reflects the first color light of the first light, and the second fluorescent region 614b generates a second color light of the first light And reflecting the second color light of the first light, the scattering region 614c scatters and reflects the excitation light as the third color light of the first light.

The second light source 612 is located on a second side of the wavelength conversion device 614 opposite to the first side, and the first laser region 614d receives the second light emitted by the second light source 612. a color light that transmits the first color light of the second light, the second laser region 614e receiving the second color light of the second light emitted by the second light source and the second light The second color light is transmitted.

The light source device 610 further includes a first beam splitting light element 617a, a second beam splitting light element 617b, a guiding element 618, and a filter device 661. Please refer to FIG. 11. FIG. 11 is a schematic plan view showing the structure of the first beam splitting and light combining element 617a. The first beam splitting light element 617a is located at a first side of the wavelength conversion device 614, and the excitation light emitted by the excitation light source 613 is guided to a first region 617d of the first beam splitting light element 617a to The wavelength conversion device 614, the first and second color lights of the first light, and the first and second color lights of the second light emitted by the wavelength conversion device 614 are guided to the first point The photosynthetic light element 617 is further configured to pass the first and second color lights of the first light, the first color and the second color light of the second light to the guiding element 618, etc. Leading to the spatial light modulator 631, the second region of the first beam splitting light element 617 is also used to reflect the third color of the first light of the wavelength conversion device 614 (such as the scattering region 614c) Light is directed to the spatial light modulator 631 via the guiding element 618 or the like. The guiding element 618 can be a mirror.

The second beam splitting light element 617b is configured to receive the first color light of the second light emitted by the red laser light source 615 and the second color light of the second light emitted by the green laser light source 616 and the first color The first and second color lights of the two lights are respectively directed to the wavelength conversion device 614.

The filter device 661 can be disposed at a periphery of the wavelength conversion device 614 and rotates with the rotation of the wavelength conversion device 614, and the guiding member 618 guides the first light and the second light to the a filter device 661 that filters the first light and the second light and uses the filtered first light and the second light to be provided via the light homogenizing device 663 To the spatial light modulator 631. Further, it can be understood that between the wavelength conversion device 614 and the first beam splitting light element 617a, between the guiding element 618 and the filter device 661, and the second beam splitting light element 617b A relay lens 662 may be disposed between the wavelength conversion devices 614 for adjusting the light. The light homogenizing device 663 can be a light-diffusing square bar for providing uniform first and second light to the spatial light modulator 631. Further, the first light and the second light emitted by the light homogenizing device 663 are supplied to the spatial light modulator 631 via the image synthesizing device 640, and the spatial light modulator 631 performs image modulation. The image light is emitted to the image synthesizing device 6410, and further guided by the image synthesizing device 640 to the lens 664 for projection display.

Please refer to FIG. 12. FIG. 12 is a schematic diagram of a specific structure of a second embodiment of the display device 600 shown in FIG. The second embodiment is substantially the same as the first embodiment, and the main difference between the two is that the structure of the wavelength conversion device 614, the position of the second light source 612, and the optical path of the light source device are implemented as shown in FIG. The examples are different. Specifically, in the second embodiment, the wavelength conversion device 614 is a reflective wavelength conversion device, the first fluorescent region 614a, the second fluorescent region 614b, the scattering region 614c, and the first A laser region 614e and the second laser region 614f are both reflective regions, and the excitation light source 613 and the second light source 612 are both located on a first side of the wavelength conversion device 614, and the excitation light source 613 emits The excitation light is sequentially supplied to the first fluorescent region 614a, the second fluorescent region 614b, and the scattering region 614c, and the first fluorescent region 614a generates the first color light of the first light and a first color light reflection of the first light, the second fluorescent region 614b generating a second color light of the first light and reflecting the second color light of the first light, the scattering region 614c The excitation light is scattered and reflected as a third color light of the first light, and the first laser region 614d receives the first color light of the second light emitted by the second light source 612 and the First light reflection of the second light, said The second laser region 614e receives the second color light of the second light emitted by the second light source 612 and reflects the second color light of the second light.

In the second embodiment, the light source device 610 further includes a first beam splitting light element 617a, a second beam splitting light element 617b, and a third beam splitting light combining element 617c. The structure of the first beam splitting light element 617a is as shown in FIG.

The excitation light emitted by the excitation light source 613 is sequentially guided to the wavelength conversion device 614 via the first region of the second beam splitting light combination element 617b and the first beam splitting light combining element 617a. The third beam splitting light element 617c is configured to receive the first color light of the second light emitted by the red laser light source 615 and the second color light of the second light emitted by the green laser light source 616 and The first and second color lights of the two lights are guided to the second beam splitting light element 617b. The second beam splitting light element 617b further receives the second light emitted by the second light source 612 and directs the second light to the first region 617d of the first beam splitting light element 617a to the Wavelength conversion device 614. The first and second color lights of the first light and the first and second color lights of the second light emitted by the wavelength conversion device 614 are guided to the first beam splitting light element 617a, The first beam splitting light element 617a is further configured to guide the first and second color lights of the first light and the first and second color lights of the second light through the guiding element 618 and the filter device 661. a light homogenizing device 663 and the like to the spatial light modulator 631, the second region 617e of the first beam splitting light element 617a is further configured to use the third color light of the first light to reflect the scattering region 614c The spatial light modulator 631 is guided via a guiding element 618, a filter device 661, a light homogenizing device 663, and the like.

Referring to FIG. 8 and FIG. 13, the control and display principle of the display device 600 shown in FIG. 9 and FIG. 10 will be described below.

In a first time period t1, the first fluorescent region 614a of the wavelength conversion device 614 is located on the optical path of the excitation light emitted by the excitation light source 613, the excitation light source 613 is turned on, and the red laser light source of the second light source 612 is turned on. Both the 615 and the green laser source are turned off, the first fluorescent region 614a emits red fluorescence, and the red fluorescence is directed to the spatial light modulator 631, and the spatial light modulator 631 modulates the value according to the correction control signal value r. Red fluorescence gets a red picture.

In the second period t2, the second fluorescent region 614b of the wavelength conversion device 614 is located on the optical path of the excitation light emitted by the excitation light source 613, the excitation light source 613 is turned on, and the red laser light source of the second light source 612 is turned on. Both the 615 and the green laser light source are turned off, the second fluorescent region 614b emits green fluorescence, and the green fluorescent light is directed to the spatial light modulator 631, and the spatial light modulator 631 modulates the color according to the correction control signal value g. Green fluorescence gets a green picture.

In a third time period t3, the scattering region 614c of the wavelength conversion device 614 is located on the optical path of the excitation light emitted by the excitation light source 613, the excitation light source 613 is turned on, and the red laser light source 615 of the second light source 612 and The green laser light source is turned off, the scattering region 614c emits excitation light (i.e., blue laser light), and the blue laser light is directed to the spatial light modulator 631, and the spatial light modulator 631 modulates the correction signal value b according to The blue laser is blue.

In a fourth time period t4, the first laser region 614d of the wavelength conversion device 614 is located on the optical path of the red laser, the excitation light source 613 is turned off, the red laser light source 615 is turned on, and the green laser light source 616 is turned off. The first laser region 614d emits a red laser light, and the red laser light is directed to the spatial light modulator 631, and the spatial light modulator 631 modulates the red laser light according to the correction control signal value rl to obtain a green color image.

In a fifth time period t5, the second laser region 614e of the wavelength conversion device 614 is located on the optical path of the green laser, the excitation light source 613 is turned off, the red laser light source 615 is turned off, and the green laser light source 616 is turned on. The second laser region 614e emits a green laser light, which is guided to the spatial light modulator 631, and the spatial light modulator 631 modulates the green laser light according to the correction control signal value gl to obtain a green screen.

Compared with the prior art, in the display device 600 of the present invention, since the second light is added, the original image data of the image is also converted into m+n corresponding to the first light and the second light, respectively. Correcting the control signal value, and respectively modulating the first light and the second light according to the m+n second correction control signal values to obtain the first image light and the second image light, thereby realizing a wide color gamut The display of the image data, and the accurate restoration of the displayed image can be ensured, and the color gamut of the display device 600 is wider and the display effect is better.

Further, when calculating the correction control signal values r, g, b, rl, gl, by making the data values of r, g, b, rl, and gl when the rl ² + gl ² is minimized, The use of the red laser and the green laser corresponding to the rl and gl is less, thereby reducing the cost of the light source. Still further, with the display device 600 of the present invention, it is possible to achieve a color gamut range of the REC 2020 by adding a small amount of red and green laser light. Please refer to FIG. 14. FIG. 14 is a schematic diagram showing the technical color gamut and color volume expansion of the display device shown in FIG. As shown in FIG. 14, by adding a 5% luminance green laser and a red laser, the color gamut can be extended to the range of Rec. 2020, wherein the peripheral shadow region shown in FIG. 14 is an extended color gamut range, so The display device 600 and the display device using the display method have better display effects.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

A display device, characterized in that the display device comprises:

a light source device for emitting first light and second light, wherein the first light is used to modulate an image of a first color gamut, and the second light is used to modulate the first color together with the first light An image outside the domain range, the first light includes m color lights, and the second light includes n color lights of m color lights, m is greater than or equal to n, where m is greater than or equal to n, and n is greater than or equal to 1 Natural number, m is a natural number greater than or equal to 2;

An image data processing module, configured to receive original image data of an image to be displayed, the original image data of the image to be displayed is image data based on a second color gamut range and includes original control signal values of m colors of each pixel, The second color gamut range covers the first color gamut range and has a portion exceeding the first color gamut range, and the image data processing module is further configured to use each pixel of the original image data of the image to be displayed The original control signal values of the m colors are mapped to the correction control signal values of the m+n colors to obtain corrected image data of the image to be displayed, in which the m+n colors of the pixels are corrected. The control signal value includes m+n correction control signal values respectively corresponding to the m color lights of the first light and the n color lights corresponding to the second light;

a spatial light modulator, configured to time-modulate a corresponding color light of the first light and the second light according to a correction control signal value of m+n colors of each pixel in a modulation time of the image To get the image light.
The display device according to claim 1, wherein m is 3, n is 2, and original control signal values of m colors of each pixel are R, G, and B, corresponding to m of the first light. The correction control signal values of the color lights are r, g, b, and the correction control signal values corresponding to the n color lights of the second light are rl, gl, according to the original control signal values R, G, B of the pixels. The tristimulus value of the pixel obtained by the calculation is equal to the tristimulus value of the pixel calculated based on the first correction control signal values r, g, b and the second correction control signal values rl, gl of the pixel.
The display device according to claim 2, wherein said image data processing module calculates said correction control signal values as r, g, b, rl according to original control signal values R, G, B of each pixel. In the case of gl, the data values of r, g, b, rl, and gl when rl 2 + gl 2 are the smallest are taken.
The display device according to claim 1, wherein said first light comprises first color light, second color light and third color light, said second light comprising first color light and second color light The correction control signal value includes a correction control signal value corresponding to the first color light of the first light, a correction control signal value corresponding to the second color light of the first light, and a corresponding to the first light a control signal value of the three color light, a correction control signal value corresponding to the first color light of the second light, and a correction control signal value corresponding to the second color light of the second light, a modulation time T1 of the image Dividing into a first time period t1, a second time period t2, a third time period t3, a fourth time period t4, and a fifth time period t5 that do not overlap each other, the spatial light modulator is used at the first time The segment t1 modulates the first color light of the first light according to the correction control signal value corresponding to the first color light of the first light, and according to the corresponding first light in the second time period t2 Correction control signal value of the second color light modulates the first light The second color light modulates the third color light of the first light according to a correction control signal value corresponding to the third color light of the first light in the third time period t3 to generate the image light, The fourth time period t4 modulates the first color light of the second light according to the value of the correction control signal corresponding to the first color light of the second light, and according to the corresponding first part in the fifth time period t5 The correction control signal value of the second color light of the two lights modulates the second color light of the second light.
The display device according to claim 4, wherein the first time period t1, the second time period t2, and the third time period t3 are both greater than the fourth time period t4 and the first Five time period t5.
The display device according to claim 4, wherein the fourth time period t4 and the fifth time period t5 are equal, the first time period t1, the second time period t2, and the first The three time periods t3 are equal, and the first time period t1 is twice the fourth time period t4.
A display device according to claim 4, wherein said light source means comprises a first light source for emitting said first light and said second light source for emitting said The second light, the first light source includes an excitation light source and a wavelength conversion device, the excitation light source emits excitation light, the wavelength conversion device has a fluorescent material and is configured to receive the excitation light and emit the first light, The first light includes fluorescence, the second light source includes a laser light source, and the second light includes a laser light.
A display device according to claim 7, wherein said excitation light source is a laser light source, said excitation light is a blue laser, said wavelength conversion means for receiving said excitation light and said excitation light a portion is converted into the fluorescence, and another portion of the excitation light and the fluorescence are used as the first light, and another portion of the excitation light is a third color light of the first light, Fluorescence includes red light and green light, the fluorescent red light being the first color light of the first light, the fluorescent green light being the second color light of the first light; the second light source comprising a red laser source and a green laser source, the second light comprising a red laser and a green laser, the red laser being a first color light of the second light, and the green laser being a second color of the second light Light.
A display device according to claim 8, wherein said wavelength converting means comprises a first fluorescent region having a first fluorescent material and emitting first color light of said first light, having a second fluorescent material And a second fluorescent region for emitting the second color light of the first light, a scattering region corresponding to the third color light of the first light, and a second receiving the second light emitted by the second light source a first laser region of a color light and emitting a first color light of the second light, and a second color light receiving the second light emitted by the second light source and emitting a second color of the second light a second laser region of color light, the first fluorescent region, the second fluorescent region, the scattering region, the first laser region, and the second laser region are arranged in a circumferential direction, the wavelength conversion Rotating in the circumferential direction when the device is in operation to emit the first color light of the first light, the second color light of the first light, and the first light of the first light in a time of modulation of the image Three color light, first of the second light Color light, second color light of the second light.
The display device according to claim 9, wherein the display device further comprises a control chip, the control chip controls a lighting timing of the excitation light source, a lighting timing of the laser light source, and a wavelength conversion device a rotational speed, a modulation timing of the spatial light modulator such that an illumination timing of the excitation light source, a light emission timing of the second light source, a rotational speed of the wavelength conversion device, and a modulation timing of the spatial light modulator are matched .
The display device according to claim 9, wherein said wavelength conversion device is a transflective wavelength conversion device, and said first laser region and said second laser region are both transmissive regions, said a fluorescent region, the second fluorescent region and the scattering region are all reflective regions, the excitation light source is located at a first side of the wavelength conversion device, and the excitation light emitted by the excitation light source is sequentially supplied to the a first fluorescent region, a second fluorescent region, and the scattering region, the first fluorescent region generating a first color light of the first light and reflecting the first color light of the first light The second fluorescent region generates a second color light of the first light and reflects the second color light of the first light, the scattering region using the excitation light as a third color light of the first light Scattering and reflecting, the second light source being located on a second side of the wavelength conversion device opposite the first side, the first laser region receiving the second light emitted by the second light source First color light and said The first color light of the second light is transmitted, the second laser region receives the second color light of the second light emitted by the second light source and transmits the second color light of the second light.
A display device as claimed in claim 11, wherein said light source means further comprises a first beam splitting light element, said first beam splitting light element being located on a first side of said wavelength converting means, said excitation light source The emitted excitation light is guided to the wavelength conversion device via a first region of the first beam splitting light element, and the first and second color lights of the first light emitted by the wavelength conversion device The first and second color lights of the second light are guided to the first beam splitting light element, and the first beam splitting light element is further configured to use the first and second color lights of the first light, The first and second color lights of the second light are directed to the spatial light modulator, and the second region of the first beam splitting light element is further configured to reflect the first light of the scattering region The third color light is directed to the spatial light modulator.
A display device according to claim 11, wherein said light source means further comprises a second beam splitting light element, said second beam splitting light combining means for receiving a second light emitted by said red laser source a color light and a second color light of the second light emitted by the green laser light source and guiding the first and second color lights of the second light to the wavelength conversion device, respectively.
A display device according to claim 9, wherein said wavelength converting means is a reflective wavelength converting means, said first fluorescent region, said second fluorescent region, said scattering region, said first laser The region and the second laser region are both reflective regions, and the excitation light source and the second light source are both located on a first side of the wavelength conversion device, and the excitation light emitted by the excitation light source is sequentially provided to the a first fluorescent region, a second fluorescent region, and the scattering region, the first fluorescent region generating a first color light of the first light and reflecting the first color light of the first light The second fluorescent region generates a second color light of the first light and reflects the second color light of the first light, the scattering region using the excitation light as a third color light of the first light Performing scattering and reflection, the first laser region receiving the first color light of the second light emitted by the second light source and reflecting the first color light of the second light, the second laser region receiving The second light source The second color of the second light and the second color of the second light are reflected.
The display device according to claim 14, wherein the light source device further comprises a first beam splitting light combining element and a second beam splitting light combining element, wherein the excitation light emitted by the excitation light source is sequentially passed through the first a first region of the dichroic light combining element, the first beam splitting light element is directed to the wavelength conversion device, the second beam splitting light element further receiving the second light emitted by the second light source Transmitting the second light to the wavelength conversion device via the first region of the first beam splitting light element, the first, second color light, the second light of the first light emitted by the wavelength conversion device The first and second color lights of the light are guided to the first beam splitting light element, the first beam splitting light element further configured to use the first and second color lights of the first light, the first The first and second color lights of the two lights are directed to the spatial light modulator, and the second region of the first beam splitting light element is further configured to reflect the third color of the first light of the scattering region Light is directed to the spatial light modulator.
A display device according to claim 15, wherein said light source means further comprises a third beam splitting light combining element, said third beam splitting light combining element for receiving a second light emitted by said red laser light source a color light and a second color light of the second light emitted by the green laser light source and guiding the first and second color lights of the second light to the second beam splitting light element.
A display device according to claim 12 or 15, wherein said light source means further comprises a guiding member for receiving said first light emitted by said first beam combining unit and said The second light directs the first light and the second light to the spatial light modulator.
The display device according to claim 17, wherein said light source device further comprises a filter device, said filter device being disposed at a periphery of said wavelength conversion device and rotating with rotation of said wavelength conversion device The guiding element directs the first light and the second light to the filter device, the filter device filters the first light and the second light and uses the filtered light The first light and the second light are provided to the spatial light modulator.
The display device according to claim 18, wherein the display device further comprises a light homogenizing device, an image synthesizing device and a lens, and the filtered first light and the second light are A light homogenizing device and an image synthesizing device are provided to the spatial light modulator, the spatial light modulator emitting the image light to be further guided by the image synthesizing device to the lens for projection display.