WO2019037330A1 - 具有高对比度的显示系统及方法 - Google Patents

具有高对比度的显示系统及方法 Download PDF

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Publication number
WO2019037330A1
WO2019037330A1 PCT/CN2017/114737 CN2017114737W WO2019037330A1 WO 2019037330 A1 WO2019037330 A1 WO 2019037330A1 CN 2017114737 W CN2017114737 W CN 2017114737W WO 2019037330 A1 WO2019037330 A1 WO 2019037330A1
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light
image
unit
image signal
signal
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English (en)
French (fr)
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郭祖强
杜鹏
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0686—Adjustment of display parameters with two or more screen areas displaying information with different brightness or colours

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a display system and method having high contrast.
  • the brightest signal acceptable to the human eye is 100,000 times that of the darkest signal.
  • the single-chip spatial light modulator can modulate the gray scale range to a limited extent, taking the common 8-bit grayscale signal as an example. It can display gray scales of no more than 255 steps, and the contrast ratio is hard to exceed 2000:1. Regardless of gray scale or contrast, the range of single-space spatial light modulators can be much lower than that of the human eye.
  • the existing method of improving the contrast based on displaying gray scales is to adopt a photographing device with high gray scale and high contrast when shooting, but the existing photographing and photographing equipment, especially the digital photographing camera, does not have a gray scale of up to 16 bits, so
  • the general way is to take two photos in the shooting time of one frame of image, one for a long exposure time, which contains all the highlight details, one short exposure time, which contains all the dark details. Then, through image processing technology, the two low-level gray-scale images respectively including the highlight detail and the shadow detail are combined into a high-order gray-scale image including both the highlight detail and the shadow detail, which greatly increases the image data capacity, and also A high gray scale spatial light modulator is required.
  • FIG. 1 is a schematic structural diagram of a conventional display system.
  • 1 is an excitation light source
  • 2 is a lighting unit
  • 3 is a spatial light modulator
  • 4 is an image signal unit
  • the excitation light source 1 emits time-series R, G, B three primary colors of light, and is relayed to the spatial light by the illumination unit 2 Modulator 3
  • spatial light modulator 3 receives image signal from image signal unit 4 to modulate excitation light System and output images.
  • the spatial light modulator 3 and the image signal unit 4 are matched to each other.
  • the image signal that the spatial light modulator 3 can recognize is also 8 Bit gray scale, for 10 bit gray image signal (1024 gray / color) or other bit gray image signals will not be recognized, so for the existing high gray scale display high contrast method, the image signal itself is required Both the spatial light modulator and the spatial light modulator have a high gray scale.
  • the technical problem to be solved by the present invention is to provide a display system and method with high contrast to improve the contrast of an image without increasing the image data capacity and without requiring a high gray scale spatial light modulator.
  • a technical solution adopted by the present invention is to provide a display system with high contrast, including:
  • An image signal unit for outputting an image signal
  • An image algorithm unit connected to the image signal unit, for receiving the image signal and decomposing the image signal and outputting to the modulation unit;
  • the modulating unit is connected to the excitation light source and the image algorithm unit for modulating the received excitation light according to the received image signal to obtain image light of a high gray level;
  • an image output unit connected to the modulation unit for outputting a high-contrast image according to the received image light of the high-order gray scale.
  • a technical solution adopted by the present invention is to provide a display method with high contrast, including:
  • Excitation light is emitted by the excitation light source
  • an image signal from the image algorithm unit to Exciting light received by the excitation light source is modulated to obtain image light of a high gray level
  • the image of the high-order gray scale received from the modulation unit is processed by the image output unit into a high-contrast image and output.
  • the invention has the beneficial effects that the display system and method with high contrast according to the present invention processes the image signal output from the image signal unit by the image algorithm unit to distinguish it from the prior art.
  • the image signal is decomposed and supplied to the modulating unit without changing the number of bits of the image signal, so that the modulating unit modulates the excitation light received from the excitation light source according to the received image signal, thereby
  • the contrast of the image is improved without increasing the image data capacity and without requiring a high gray scale spatial light modulator.
  • FIG. 1 is a schematic structural view of a conventional display system
  • FIG. 2 is a schematic structural view of a first embodiment of a display system with high contrast of the present invention
  • FIG. 3 is a schematic diagram of an algorithm of the image algorithm unit of FIG. 2;
  • FIG. 4 is a schematic structural view of a second embodiment of a display system with high contrast of the present invention.
  • Figure 5 is a schematic view showing the structure of a third embodiment of the display system with high contrast of the present invention.
  • 6 and 7 are schematic flow charts of a display method with high contrast according to the present invention.
  • the display system with high contrast includes an excitation light source 11 for emitting excitation light, an image signal unit 13 for outputting an image signal, and an image algorithm unit 14 for connecting the image signal unit 13 for the image signal
  • the unit 13 receives the image signal and decomposes the image signal and outputs it to the modulating unit 12;
  • the modulating unit 12 is connected to the excitation light source 11 and the image algorithm unit 14 for use according to the image algorithm unit
  • the received image signal adjusts the excitation light received from the excitation light source 11
  • the image light is obtained to obtain a high-order gray scale image;
  • the image output unit 15 is connected to the modulation unit 12 for outputting a high-contrast image based on the image light of the high-order gray scale received from the modulation unit 12.
  • the image light is light with an image signal
  • the excitation light source may comprise several light sources respectively emitting three primary colors of light, or alternatively, the blue laser and the fluorescent wheel may be used to emit three primary colors, and It is not limited to the scope of the present invention.
  • the excitation light is three primary colors
  • the modulation unit 12 includes an illumination unit 121 connected to the excitation light source 11 for providing the three primary colors to the first modulation combination 122; the first modulation Combination 122, comprising a plurality of spatial light modulators 1221, each spatial light modulator 1221 being coupled to the image algorithm unit 14 for receiving image signals of lower gray levels from the image algorithm unit 14 for pairing from the illumination unit
  • the received three primary colors of light are modulated to obtain high-order gray-scale image light and output to the image output unit 15 to output a high-contrast image according to the high-order gray-scale image light.
  • the illumination unit generally includes an optical device such as a relay lens, a light homogenizing device, and a mirror, and the structure thereof is the same as the existing structure, and details are not described herein again.
  • the three primary colors of light are red light, green light, and blue light.
  • the excitation light source 11 may be a bulb, an LED, or an LD.
  • the spatial light modulator 1221 is a reflective DMD, LCOS, or transmissive LCD, or may be transmissive. And reflective fluorescent chips or other display chips.
  • FIG. 3 is a schematic diagram of an algorithm of the image algorithm unit 14 of the present invention.
  • the algorithm principle of the image algorithm unit 14 is as follows. Based on the gray level of the image signal output by the image signal unit 13, the image signal needs to be supplied to a plurality of spatial light modulators, and the image signal is guaranteed. On the basis of the maximum gradation and brightness, the brightness of each gradation is lowered, and an image with natural picture and high contrast is obtained.
  • the modulating unit 12 includes a plurality of spatial light modulators (such as n spatial light modulators), each of which receives the processed image signals from the image algorithm unit 14 and according to the received images. The signal modulates the excitation light emitted by the excitation light source 11 to obtain image light of a high-order gray scale.
  • the image algorithm unit 14 is configured to convert the received image signal as a first image signal and convert the first image signal (eg, m bits) into a first stimulation signal that is the same as the first image signal ( In the case of m bits, the first stimulation signal is further converted into a second stimulation signal corresponding to the number of the plurality of spatial light modulators and the number of bits is higher than the number of bits of the first stimulation signal (eg, m*n Bit), finally converting the second stimulation signal into a second image signal (eg, m*n bits) corresponding to the number of the plurality of spatial light modulators and being the same as the second stimulation signal, and The second image signal is decomposed into image signals (e.g., m bits) of the same number as the plurality of spatial light modulators and being the same as the first image signal, and respectively supplied to the plurality of spatial light modulators.
  • image signals e.g., m bits
  • the m-bit image signal of the image signal unit 13 is supplied to the spatial light modulator 1221 of the n m-bit image signals of the first modulation combination 122, the m-bit image signal is converted into an m-bit stimulation signal, m The bit stimulation signal is converted into an m*n bit stimulation signal, the m*n bit stimulation signal is converted into an m*n bit image signal, and the m*n bit image signal is decomposed into n groups of m-bit image signals and supplied to n spaces.
  • Light modulator When the m-bit image signal of the image signal unit 13 is supplied to the spatial light modulator 1221 of the n m-bit image signals of the first modulation combination 122, the m-bit image signal is converted into an m-bit stimulation signal, m The bit stimulation signal is converted into an m*n bit stimulation signal, the m*n bit stimulation signal is converted into an m*n bit image signal, and the m*n bit image signal is decomposed into n groups of m-
  • the gray level of the image signal that can be received by the three spatial light modulators in series is 2 (m1+m2+m3)
  • the image signal to be converted is ( Image signal of m1+m2+m3) bit
  • n spatial light modulators can be connected in series to image signals
  • the gray scale is 2 n*m , so the image signal to be converted is an image signal of n*m bits.
  • XYZ represents a red light stimulation amount, a green light stimulation amount, and a blue light stimulation amount, respectively, wherein the three stimulation values include color information x, y and luminance information Y in the color coordinates.
  • an 8-bit image signal (such as an RGB signal) is first converted into an 8-bit stimulus signal (such as an XYZ signal).
  • the 8-bit XYZ signal is converted to a 16-bit XYZ signal, and then the 16-bit XYZ signal is converted into a 16-bit RGB signal, and finally the 16-bit RGB signal is decomposed into two sets of 8-bit RGB signals and supplied to two spatial light modulators.
  • the color coordinates x, y and the luminance value Y based on the three primary colors of the excitation light source 11 satisfy (x R , y R , Y R ), (x G , y G , Y G ), (x B , y B , Y B ), when an 8-bit image signal (R, G, B) is input, an 8-bit (X, Y, Z) signal value can be obtained first according to the following algorithm:
  • the plurality of spatial light modulators are n serial spatial light modulators, and the image signals received by each spatial light modulator satisfy the following formula:
  • R is the signal value of red light
  • G is the signal value of green light
  • B is the signal value of blue light
  • Y R is the brightness value of red light
  • Y G is the brightness value of green light
  • Y B is blue light
  • n is an integer greater than or equal to 1.
  • FIG. 4 is a schematic structural view of a second embodiment of the display system with high contrast of the present invention.
  • the second embodiment of the display system having high contrast differs from the first embodiment described above in that the excitation light is white light, and the modulation unit 12 includes a first modulation combination 121 including a plurality of spatial light modulators. 1211, each spatial light modulator 1211 is coupled to the image algorithm unit 14 for receiving an image signal from the image algorithm unit 14, the first modulation combination 121 being coupled to the excitation light source 11 for receiving The image signal modulates the white light and outputs the modulated white light.
  • the illumination unit 122 is connected to the first modulation combination 121 and the second modulation combination 123 for dividing the white light modulated by the first modulation combination 121 into three primary color lights and providing the second modulation combination 123.
  • the spatial light modulators in the first modulation combination are connected in series, and the spatial light modulators in the second modulation combination are connected in parallel, in other embodiments.
  • the first modulation combination and the second modulation The connection mode of the spatial light modulator in the combination is not limited to the above, and may be selected as needed, such as series, parallel, or a combination of series and parallel.
  • the second modulation combination 123 includes three spatial light modulators 1231 that are respectively coupled to the image algorithm unit 14 to receive image signals from the image algorithm unit 14, the second The modulation combination 123 is further connected to the illumination unit 122 to receive three primary colors of light from the illumination unit 122 and modulate the three primary colors of light according to the image signal to obtain image light of high gray scale and output to the image The unit is output such that it outputs a high-contrast image according to the image light of the high-order gray scale.
  • the plurality of spatial light modulators 1211 of the first modulation combination 121 are n serial spatial light modulators, and the image signals received by each spatial light modulator satisfy the following formula:
  • R is the signal value of red light
  • G is the signal value of green light
  • B is the signal value of blue light
  • Y R is the brightness value of red light
  • Y G is the brightness value of green light
  • Y B is blue light
  • n is an integer greater than or equal to 1.
  • FIG. 5 is a schematic structural view of a third embodiment of the display system with high contrast of the present invention.
  • the third embodiment of the display system with high contrast differs from the first embodiment described above in that the excitation light is blue light and yellow light, and the modulation unit 12 includes a first modulation combination 121, including several a spatial light modulator 1211, each spatial light modulator 1211 is coupled to the image algorithm unit 14 for receiving an image signal from the image algorithm unit 14, the first modulation combination 121 being coupled to the excitation light source 11 for The primary light is modulated at one time and the mixed light is modulated at another time.
  • the excitation light is blue light and yellow light
  • the modulation unit 12 includes a first modulation combination 121, including several a spatial light modulator 1211, each spatial light modulator 1211 is coupled to the image algorithm unit 14 for receiving an image signal from the image algorithm unit 14, the first modulation combination 121 being coupled to the excitation light source 11 for The primary light is modulated at one time and the mixed light is modulated at another time.
  • the two spatial light modulators 1211 are configured to modulate the blue light according to the received image signal at a first time and output the modulated blue The color light, the two spatial light modulators 1211 are further configured to modulate the yellow light according to the received image signal at a second time and output the modulated yellow light.
  • a lighting unit 122 connected to the first modulation combination 121 and the second modulation combination 123, for providing blue light modulated by the first modulation combination 121 to the second modulation combination 123 and to the first modulation
  • the yellow light modulated by the combination 121 is divided into green light and red light.
  • the second modulation combination 123 is supplied.
  • the second modulation combination 123 includes two spatial light modulators 1231, and the two spatial light modulators 1231 are respectively connected to the image algorithm unit 14 to receive image signals from the image algorithm unit 14, in the At one moment, a spatial light modulator 1231 of the second modulation combination 123 receives blue light from the illumination unit 122 and modulates the blue light according to the image signal, and at the second moment, the The two spatial light modulators 1231 in the second modulation combination 123 respectively receive green light and red light from the illumination unit 122 and modulate the green light and the red light according to the image signal to obtain a high gray.
  • the image light of the order is output to the image output unit such that it outputs a high-contrast image according to the image light of the high-order gray scale.
  • the first modulation combination 121 affects an image of green light and red light when performing signal modulation, in order to ensure the second time modulation image and the first time modulation image
  • the color of the synthesized image does not change. Therefore, the first modulation combination 121 modulates the blue light and the yellow light by time series respectively, and the modulation amplitude of the blue light and the modulation amplitude of the yellow light should be consistent, that is, according to The signal B n and the signal Y n are respectively modulated such that the gray scale changes of the white light of the synthesized one-frame image output from the first modulation combination 121 are identical, such as the modulation of the blue light and the modulation of the yellow light are inconsistent.
  • the output image is distorted.
  • the plurality of spatial light modulators 1211 of the first modulation combination 121 are n serial spatial light modulators, and the image signals received by each spatial light modulator 1211 satisfy the following formula:
  • each spatial light modulator 1211 satisfies the following formula:
  • R is the signal value of red light
  • G is the signal value of green light
  • B is the signal value of blue light
  • Y R is the brightness value of red light
  • Y G is the brightness value of green light
  • Y B is blue light
  • n is an integer greater than or equal to 1.
  • FIG. 6 is a schematic flow chart of a display method with high contrast according to the present invention.
  • the method includes the following steps:
  • Step S1 Excitation light is emitted by the excitation light source 11.
  • the excitation light source 11 may be a light bulb, an LED or an LD, and the excitation light emitted by the excitation light source 11 may be three primary colors, white light or blue light and yellow light, wherein the three primary colors are red light and green. Light and blue light.
  • Step S2 The image signal is output by the image signal unit 13.
  • the image signal output by the image signal unit 13 is an image signal of a lower gray scale.
  • Step S3 The image signal is received from the image signal unit 13 by the image algorithm unit 14, and the image signal is decomposed and output to the modulation unit 12.
  • Step S4 The image signal is received from the image algorithm unit 14 by the modulation unit 12 to modulate the excitation light received from the excitation light source 11 to obtain image light of a high-order gray scale.
  • Step S5 The image of the high-order gray scale received from the modulation unit 12 is processed by the image output unit 15 into a high-contrast image and output.
  • step S3 includes:
  • Step S31 Convert the m-bit image signal into an m-bit stimulation signal.
  • Step S32 Convert the m-bit stimulation signal into an m*n-bit stimulation signal.
  • Step S33 Convert the m*n-bit stimulation signal into an m*n-bit image signal.
  • Step S34 Decompose the m*n-bit image signal into n sets of m-bit image signals and provide them to n spatial light modulators.
  • the spatial light modulators 1211, 1231 are reflective DMD, LCOS or transmissive LCD, and may be transmissive and reflective fluorescent chips or other display chips. Wherein, if the m-bit image signal is directly divided into two m-bit image signals and provided to the two spatial light modulators respectively, the image color changes, so the stimulation value XYZ of the red light, the green light and the blue light is required. Make the conversion.
  • XYZ represents a red light stimulation amount, a green light stimulation amount, and a blue light stimulation amount, respectively, wherein the three stimulation values include color information x, y and luminance information Y in the color coordinates.
  • the display system and method having high contrast processing image signals outputted from the image signal unit by the image algorithm unit to decompose and provide the image signals with the same number of bits a modulating unit that causes the modulating unit to modulate excitation light received from the excitation light source according to the received image signal, thereby achieving a situation in which the image data capacity is not increased and a high gray scale spatial light modulator is not required Next, increase the contrast of the image.

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Abstract

具有高对比度的显示系统及方法。系统包括激发光源（11），发出激发光；图像信号单元（13），输出图像信号；图像算法单元（14），对图像信号分解后输出给调制单元（12）；调制单元（12），根据图像信号对激发光进行调制以得到高位灰阶的图像光；图像输出单元（15），根据接收到的高位灰阶的图像光输出高对比度的图像，以此实现在不增加图像数据容量及不需要高灰阶空间光调制器的情况下，提高图像的对比度。

Description

具有高对比度的显示系统及方法 技术领域
本发明涉及显示技术领域，特别是涉及一种具有高对比度的显示系统及方法。
背景技术
通常在人眼亮度感知范围内，人眼可接受的最亮信号是最暗信号的100000倍，单片空间光调制器能调制的灰阶范围有限，以常见的8位灰阶信号为例，其能显示的灰阶不超过255阶，对比度也很难超过2000：1，无论灰阶还是对比度，单片空间光调制器能调制的范围都远低于人眼的感知范围，对于任何种类的空间光调制器，当某个像素是全黑时，都不可能输出亮度为零，所以所有种类的空间光调制器都有一个自身的对比度，由于空间光调制器自身的特性，其自身的显示灰阶和对比度很难大幅提高，远低于人眼可接受的动态范围。
现有的基于显示灰阶来提高对比度的方式是在拍摄时采用具有高位灰阶和高对比度的拍摄设备，然而现有的摄影摄像设备，尤其数字摄影摄像设备没有高达16位的灰阶，因此一般的方式是在一帧图像的拍摄时间内拍下两幅照片，一幅曝光时间长，其包含所有亮部细节，一幅曝光时间短，其包含所有暗部细节。然后通过图像处理技术，把分别包含亮部细节和暗部细节的两幅低位灰阶图像合成一幅同时包括亮部细节和暗部细节的高位灰阶图像，这使得图像数据容量极大地增加，并且也需要高灰阶的空间光调制器。
请参阅图1，是现有显示系统的结构示意图。其中1为激发光源，2为照明单元，3为空间光调制器，4为图像信号单元，激发光源1发射出时序的R、G、B三基色光，并经照明单元2中继到空间光调制器3，空间光调制器3接收来自图像信号单元4的图像信号对激发光进行调 制，并输出图像。通常，空间光调制器3与图像信号单元4是相互匹配的，如空间光调制器3是8位灰阶(256灰度/颜色)，则该空间光调制器3能够识别的图像信号也是8位灰阶的，对于10位灰阶的图像信号(1024灰度/颜色)或其他位灰阶的图像信号将无法识别，因此对于现有采用高位灰阶显示高对比度的方法，要求图像信号本身与空间光调制器都具有高位灰阶。
发明内容
本发明主要解决的技术问题是提供一种具有高对比度的显示系统及方法，以在不增加图像数据容量及不需要高灰阶空间光调制器的情况下，提高图像的对比度。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种具有高对比度的显示系统，包括：
激发光源，用于发出激发光；
图像信号单元，用于输出图像信号；
图像算法单元，连接所述图像信号单元，用于接收所述图像信号并对所述图像信号分解后输出给调制单元；
所述调制单元，连接所述激发光源及所述图像算法单元，用于根据接收到的图像信号对接收到的激发光进行调制以得到高位灰阶的图像光；及
图像输出单元，连接所述调制单元，用于根据接收到的高位灰阶的图像光输出高对比度的图像。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种具有高对比度的显示方法，包括：
通过激发光源发出激发光；
通过图像信号单元输出图像信号；
通过图像算法单元从所述图像信号单元接收所述图像信号并对所述图像信号处理后输出给调制单元；
通过所述调制单元从所述图像算法单元接收图像信号以对从所述 激发光源接收到的激发光进行调制来得到高位灰阶的图像光；及
通过图像输出单元将从所述调制单元接收到的高位灰阶的图像光处理为高对比度的图像后输出。
本发明的有益效果是：区别于现有技术的情况，本发明的所述具有高对比度的显示系统及方法通过所述图像算法单元对从所述图像信号单元输出的图像信号进行处理，以在所述图像信号的位数不变的情况下对其进行分解并提供给调制单元，以使所述调制单元根据接收到的图像信号对从所述激发光源接收到的激发光进行调制，以此实现在不增加图像数据容量及不需要高灰阶空间光调制器的情况下，提高图像的对比度。
附图说明
图1是现有的显示系统的结构示意图；
图2是本发明的具有高对比度的显示系统的第一实施例的结构示意图；
图3是图2中的图像算法单元的算法示意图；
图4是本发明的具有高对比度的显示系统的第二实施例的结构示意图；
图5是本发明的具有高对比度的显示系统的第三实施例的结构示意图；
图6及图7是本发明的具有高对比度的显示方法的流程示意图。
具体实施方式
请参阅图2，是本发明的具有高对比度的显示系统的第一实施例的结构示意图。所述具有高对比度的显示系统包括激发光源11，用于发出激发光；图像信号单元13，用于输出图像信号；图像算法单元14，连接所述图像信号单元13，用于从所述图像信号单元13接收所述图像信号并对所述图像信号分解后输出给调制单元12；所述调制单元12，连接所述激发光源11及所述图像算法单元14，用于根据从所述图像算法单元14接收到的图像信号对从所述激发光源11接收到的激发光进行调 制以得到高位灰阶的图像光；图像输出单元15，连接所述调制单元12，用于根据从所述调制单元12接收到的高位灰阶的图像光输出高对比度的图像。其中，所述图像光为带有图像信号的光，所述激发光源可以包括几种光源，分别发出三种基色光，或者，也可以是蓝激光与荧光轮配合使用发出三种基色光，并不限定于本发明的范围。
具体地，所述激发光为三基色光，所述调制单元12包括照明单元121，连接所述激发光源11，用于将所述三基色光提供给第一调制组合122；所述第一调制组合122，包括若干空间光调制器1221，每一空间光调制器1221分别连接所述图像算法单元14，用于从所述图像算法单元14接收低位灰阶的图像信号以对从所述照明单元121接收到的三基色光进行调制来得到高位灰阶的图像光并输出给所述图像输出单元15，以使其根据所述高位灰阶的图像光输出高对比度的图像。
在本实施例中，照明单元一般会包括中继透镜、匀光装置、反射镜等光学器件，其结构与现有的结构相同，在此不再赘述。所述三基色光为红色光、绿色光及蓝色光，所述激发光源11可以为灯泡、LED或者LD，所述空间光调制器1221为反射式的DMD、LCOS或者透射LCD，也可以为透射式和反射式的荧光芯片或者其他显示芯片。
请参阅图3，是本发明的图像算法单元14的算法示意图。所述图像算法单元14的算法原理如下所示，基于所述图像信号单元13输出的图像信号的灰度等级，需要将所述图像信号提供给多个空间光调制器，在保证所述图像信号最大灰度及亮度不变的基础上，降低每个灰度的亮度，进而得到画面自然并且对比度高的图像。其中，所述调制单元12包括若干空间光调制器(如n个空间光调制器)，每一空间光调制器均从所述图像算法单元14接收处理后的图像信号，并根据接收到的图像信号对所述激发光源11发出的激发光进行调制，以得到高位灰阶的图像光。
所述图像算法单元14用于将接收到的图像信号作为第一图像信号并将所述第一图像信号(如为m位)转换为与所述第一图像信号相同位的第一刺激信号(如为m位)，再将所述第一刺激信号转换为与所述若 干空间光调制器数量相应且位数高于所述第一刺激信号位数的第二刺激信号(如为m*n位)，最后将所述第二刺激信号转换为与所述若干空间光调制器数量相应且与所述第二刺激信号相同位的第二图像信号(如为m*n位)，并将所述第二图像信号分解为与所述若干空间光调制器数量相同且与所述第一图像信号相同位的图像信号(如为m位)后分别提供给所述若干空间光调制器。所述图像信号单元13的m位图像信号提供给所述第一调制组合122的n个m位图像信号的空间光调制器1221时，所述m位图像信号被转换为m位刺激信号，m位刺激信号被转换为m*n位刺激信号，m*n位刺激信号被转换为m*n位图像信号，m*n位图像信号被分解为n组m位图像信号并提供给n个空间光调制器。其中，m位图像信号和灰阶的关系满足如下公式：灰阶＝2m，例如8位图像信号的灰阶是28＝256(0～255)，假设三个空间光调制器分别接收m1位图像信号、m2位图像信号、m3位图像信号，那么这三个空间光调制器串联后能接收的图像信号的灰阶为2(m1+m2+m3)，因此需要转换的图像信号为(m1+m2+m3)位的图像信号，当这三个空间光调制器均是接收m位图像信号，即m1＝m2＝m3＝m时，则n个空间光调制器串联后能图像信号的灰阶为2n*m，因此需要转换的图像信号为n*m位的图像信号。其中，m位的图像信号如果直接分成两个m位的图像信号分别提供给两个空间光调制器，则会造成图像颜色的变化，因此需要借助红色光、绿色光及蓝色光的刺激值XYZ进行转换。XYZ分别表示红色光刺激量、绿色光刺激量、蓝色光刺激量，其中三刺激值包括了色坐标中的颜色信息x、y和亮度信息Y。
下面举例进行说明，例如对于8位图像信号输出到两个8位图像信号的空间光调制器，先将8位的图像信号(如RGB信号)转换为8位刺激信号(如XYZ信号)，再将8位XYZ信号转换为16位XYZ信号，然后将16位XYZ信号转换为16位RGB信号，最终将16位的RGB信号分解为2组8位RGB信号并提供给两个空间光调制器。
首先，基于激发光源11的三基色光的色坐标x、y及亮度值Y满足(xR,yR,YR)，(xG,yG,YG)，(xB,yB,YB)，则输入8位图像信号(R,G,B) 时，根据以下算法可先获得8位的(X,Y,Z)信号值：
Figure PCTCN2017114737-appb-000001
将8位(X,Y,Z)信号转换为16位(X',Y',Z')信号时，在改变像素亮度值的同时要保证图像的颜色不发生改变，即：
Y′＝Y*Y/(YR+YG+YB)
Figure PCTCN2017114737-appb-000002
Figure PCTCN2017114737-appb-000003
其中，YR+YG+YB为全白场(255灰度)的亮度，16位(X',Y',Z')信号为：
Figure PCTCN2017114737-appb-000004
求解以下方程，将16位(X',Y',Z')信号转换为16位(R',G',B')信号为：
Figure PCTCN2017114737-appb-000005
因此16位RGB信号为：
Figure PCTCN2017114737-appb-000006
最终，将16位RGB信号分解为两个8位RGB信号为：
Figure PCTCN2017114737-appb-000007
根据上述公式则所述若干空间光调制器为n个串联的空间光调制器，每个空间光调制器接收到的图像信号满足如下公式：
Figure PCTCN2017114737-appb-000008
其中，R为红色光的信号值，G为绿色光的信号值，B为蓝色光的信号值，YR为红色光的亮度值，YG为绿色光的亮度值，YB为蓝色光的亮度值，n为大于等于1的整数。
请参阅图4，是本发明的具有高对比度的显示系统的第二实施例的结构示意图。所述具有高对比度的显示系统的第二实施例与上述第一实施例的区别之处在于：所述激发光为白光，所述调制单元12包括第一调制组合121，包括若干空间光调制器1211，每一空间光调制器1211连接所述图像算法单元14，用于从所述图像算法单元14接收图像信号，所述第一调制组合121连接所述激发光源11，用于根据接收到的图像信号对所述白光进行调制，并输出调制后的白光。
照明单元122，连接所述第一调制组合121及第二调制组合123，用于将所述第一调制组合121调制后的白光分为三基色光并提供给所述第二调制组合123。其中，在本实施例中，所述第一调制组合中的空间光调制器为串联的连接在一起，所述第二调制组合中的空间光调制器为并联的连接在一起，在其他实施例中，所述第一调制组合及所述第二调 制组合中的空间光调制器的连接方式不限于上述方式，可以根据需要进行选择，如串联、并联或者串联与并联相结合的方式。
所述第二调制组合123，包括三个空间光调制器1231，所述三个空间光调制器1231分别连接所述图像算法单元14以从所述图像算法单元14接收图像信号，所述第二调制组合123还连接所述照明单元122以从所述照明单元122接收三基色光并根据所述图像信号对所述三基色光进行调制，以得到高位灰阶的图像光并输出给所述图像输出单元，以使其根据所述高位灰阶的图像光输出高对比度的图像。
具体地，所述第一调制组合121的若干空间光调制器1211为n个串联的空间光调制器，且每个空间光调制器接收到的图像信号满足如下公式：
Figure PCTCN2017114737-appb-000009
其中，R为红色光的信号值，G为绿色光的信号值，B为蓝色光的信号值，YR为红色光的亮度值，YG为绿色光的亮度值，YB为蓝色光的亮度值，n为大于等于1的整数。
请参阅图5，是本发明的具有高对比度的显示系统的第三实施例的结构示意图。所述具有高对比度的显示系统的第三实施例与上述第一实施例的区别之处在于：所述激发光为蓝色光和黄色光，所述调制单元12包括第一调制组合121，包括若干空间光调制器1211，每一空间光调制器1211连接所述图像算法单元14，用于从所述图像算法单元14接收图像信号，所述第一调制组合121连接所述激发光源11，用于在某一个时刻调制基色光，另一个时刻调制混合光。例如，当第一调制组合121包含两个空间光调制器时，两个空间光调制器1211用于在第一时刻根据接收到的图像信号对所述蓝色光进行调制，并输出调制后的蓝色光，两个空间光调制器1211还用于在第二时刻根据接收到的图像信号对所述黄色光进行调制，并输出调制后的黄色光。
照明单元122，连接所述第一调制组合121及第二调制组合123，用于将所述第一调制组合121调制后的蓝色光提供给所述第二调制组合123及将所述第一调制组合121调制后的黄色光分为绿色光及红色光提 供给所述第二调制组合123。
所述第二调制组合123，包括两个空间光调制器1231，所述两个空间光调制器1231分别连接所述图像算法单元14以从所述图像算法单元14接收图像信号，在所述第一时刻，所述第二调制组合123中的一个空间光调制器1231从所述照明单元122接收蓝色光并根据所述图像信号对所述蓝色光进行调制，在所述第二时刻，所述第二调制组合123中的两个空间光调制器1231分别从所述照明单元122接收绿色光及红色光并根据所述图像信号对所述绿色光及所述红色光进行调制，以得到高位灰阶的图像光并输出给所述图像输出单元，以使其根据所述高位灰阶的图像光输出高对比度的图像。
具体地，在所述第二时刻，由于所述第一调制组合121在进行信号调制时会影响绿色光和红色光的图像，为了保证所述第二时刻调制图像与所述第一时刻调制图像的合成图像的颜色不发生改变，因此，所述第一调制组合121是通过时序分别对蓝色光及黄色光进行调制，对蓝色光的调制幅度和对黄色光的调制幅度应该相一致，即根据信号Bn和信号Yn分别进行调制，使从所述第一调制组合121输出的合成一帧图像的白光的灰阶变化一致，如对蓝色光的调制与对黄色光的调制不一致则会导致输出的图像失真。
在所述第一时刻，所述第一调制组合121的若干空间光调制器1211为n个串联的空间光调制器，且每个空间光调制器1211接收到的图像信号满足如下公式：
Figure PCTCN2017114737-appb-000010
在所述第二时刻，每个空间光调制器1211接收到的图像信号满足如下公式：
Figure PCTCN2017114737-appb-000011
其中，R为红色光的信号值，G为绿色光的信号值，B为蓝色光的信号值，YR为红色光的亮度值，YG为绿色光的亮度值，YB为蓝色光的亮度值，n为大于等于1的整数。
请参阅图6，是本发明的具有高对比度的显示方法的流程示意图。所述方法包括如下步骤：
步骤S1：通过激发光源11发出激发光。
具体地，所述激发光源11可以为灯泡、LED或者LD，所述激发光源11发出的激发光可以为三基色光、白光或者蓝色光与黄色光，其中所述三基色光为红色光、绿色光及蓝色光。
步骤S2：通过图像信号单元13输出图像信号。
其中，所述图像信号单元13输出的图像信号为低位灰阶的图像信号。
步骤S3：通过图像算法单元14从所述图像信号单元13接收所述图像信号并对所述图像信号分解后输出给调制单元12。
步骤S4：通过所述调制单元12从所述图像算法单元14接收图像信号以对从所述激发光源11接收到的激发光进行调制来得到高位灰阶的图像光。
步骤S5：通过图像输出单元15将从所述调制单元12接收到的高位灰阶的图像光处理为高对比度的图像后输出。
请参阅图7，步骤S3包括：
步骤S31：将m位图像信号转换为m位刺激信号。
步骤S32：将m位刺激信号转换为m*n位刺激信号。
步骤S33：将m*n位刺激信号转换为m*n位图像信号。
步骤S34：将m*n位图像信号分解为n组m位图像信号并提供给n个空间光调制器。
其中，所述空间光调制器1211、1231为反射式的DMD、LCOS或者透射LCD，也可以为透射式和反射式的荧光芯片或者其他显示芯片。其中，m位的图像信号如果直接分成两个m位的图像信号分别提供给两个空间光调制器，则会造成图像颜色的变化，因此需要借助红色光、绿色光及蓝色光的刺激值XYZ进行转换。XYZ分别表示红色光刺激量、绿色光刺激量、蓝色光刺激量，其中三刺激值包括了色坐标中的颜色信息x、y和亮度信息Y。
所述具有高对比度的显示系统及方法通过所述图像算法单元对从所述图像信号单元输出的图像信号进行处理，以在所述图像信号位数不变的情况下对其进行分解并提供给调制单元，以使所述调制单元根据接收到的图像信号对从所述激发光源接收到的激发光进行调制，以此实现在不增加图像数据容量及不需要高灰阶空间光调制器的情况下，提高图像的对比度。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (10)

  1. 一种具有高对比度的显示系统，其特征在于，所述系统包括：
    激发光源，用于发出激发光；
    图像信号单元，用于输出图像信号；
    图像算法单元，连接所述图像信号单元，用于接收所述图像信号并对所述图像信号处理后输出给调制单元；
    所述调制单元，连接所述激发光源及所述图像算法单元，用于根据接收到的图像信号对所述激发光进行调制以得到高位灰阶的图像光；及
    图像输出单元，连接所述调制单元，用于根据所述高位灰阶的图像光输出高对比度的图像。
  2. 根据权利要求1所述的具有高对比度的显示系统，其特征在于，所述调制单元包括若干空间光调制器，每一空间光调制器均从所述图像算法单元接收处理后的图像信号，并根据接收到的图像信号对所述激发光源发出的激发光进行调制，以得到高位灰阶的图像光；
    所述图像算法单元用于将接收到的图像信号作为第一图像信号并将所述第一图像信号转换为与所述第一图像信号相同位的第一刺激信号，再将所述第一刺激信号转换为与所述若干空间光调制器数量相应且位数高于所述第一刺激信号位数的第二刺激信号，最后将所述第二刺激信号转换为与所述若干空间光调制器数量相应且与所述第二刺激信号相同位的第二图像信号，并将所述第二图像信号分解为与所述若干空间光调制器数量相同且与所述第一图像信号相同位的图像信号后分别提供给所述若干空间光调制器。
  3. 根据权利要求2所述的具有高对比度的显示系统，其特征在于，所述激发光为三基色光，所述调制单元包括：
    照明单元，连接所述激发光源，用于对所述三基色光进行处理；及
    由若干空间光调制器组成的第一调制组合，每一空间光调制器分别连接所述图像算法单元，用于从所述图像算法单元接收低位灰阶的图像信号以对从所述照明单元接收到的三基色光进行调制来得到高位灰阶 的图像光并输出给所述图像输出单元，以使所述图像输出单元根据所述高位灰阶的图像光输出高对比度的图像。
  4. 根据权利要求3所述的具有高对比度的显示系统，其特征在于，所述三基色光为红色光、绿色光及蓝色光，所述若干空间光调制器为n个串联的空间光调制器，每个空间光调制器接收到的图像信号满足如下公式：
    Figure PCTCN2017114737-appb-100001
    其中，R为红色光的信号值，G为绿色光的信号值，B为蓝色光的信号值，YR为红色光的亮度值，YG为绿色光的亮度值，YB为蓝色光的亮度值，n为大于等于1的整数。
  5. 根据权利要求1所述的具有高对比度的显示系统，其特征在于，所述激发光为白光，所述调制单元包括：
    由若干空间光调制器组成的第一调制组合，每一空间光调制器连接所述图像算法单元，用于从所述图像算法单元接收图像信号，所述第一调制组合连接所述激发光源，用于根据接收到的图像信号对所述白光进行调制，并输出调制后的白光；
    照明单元，连接所述第一调制组合，用于将所述第一调制组合调制后的白光分为三基色光并进行处理；
    由三个空间光调制器组成的第二调制组合，所述三个空间光调制器分别连接所述图像算法单元以从所述图像算法单元接收图像信号，所述第二调制组合还连接所述照明单元以从所述照明单元接收三基色光并根据所述图像信号对所述三基色光进行调制，以得到高位灰阶的图像光并输出给所述图像输出单元，以使所述图像输出单元根据所述高位灰阶 的图像光输出高对比度的图像。
  6. 根据权利要求5所述的具有高对比度的显示系统，其特征在于，所述三基色光为红色光、绿色光及蓝色光，所述第一调制组合的若干空间光调制器为n个串联的空间光调制器，所述第二调制组合的空间光调制器为并联的空间光调制器，且每个空间光调制器接收到的图像信号满足如下公式：
    Figure PCTCN2017114737-appb-100002
    其中，R为红色光的信号值，G为绿色光的信号值，B为蓝色光的信号值，YR为红色光的亮度值，YG为绿色光的亮度值，YB为蓝色光的亮度值，n为大于等于1的整数。
  7. 根据权利要求1所述的具有高对比度的显示系统，其特征在于，所述激发光为蓝色光与黄色光，所述调制单元包括：
    由若干空间光调制器组成的第一调制组合，每一空间光调制器连接所述图像算法单元，用于从所述图像算法单元接收图像信号，所述第一调制组合连接所述激发光源，用于在第一时刻根据接收到的图像信号对所述蓝色光进行调制，并输出调制后的蓝色光，所述第一调制组合还用于在第二时刻根据接收到的图像信号对所述黄色光进行调制，并输出调制后的黄色光；
    照明单元，连接所述第一调制组合，用于将所述第一调制组合调制后的蓝色光并进行处理及将所述第一调制组合调制后的黄色光分为绿色光及红色光并进行处理；
    由两个空间光调制器组成的第二调制组合，所述两个空间光调制器分别连接所述图像算法单元以从所述图像算法单元接收图像信号，在所述第一时刻，所述第二调制组合中的一个空间光调制器从所述照明单元接收蓝色光并根据所述图像信号对所述蓝色光进行调制，在所述第二时刻，所述第二调制组合中的两个空间光调制器分别从所述照明单元接收绿色光及红色光并根据所述图像信号对所述绿色光及所述红色光进行调制，以得到高位灰阶的图像光并输出给所述图像输出单元，以使其根据所述高位灰阶的图像光输出高对比度的图像。
  8. 根据权利要求7所述的具有高对比度的显示系统，其特征在于，在所述第一时刻，所述第一调制组合的若干空间光调制器为n个串联的空间光调制器，所述第二调制组合的空间光调制器为并联的空间光调制器，且每个空间光调制器接收到的图像信号满足如下公式：
    Figure PCTCN2017114737-appb-100003
    在所述第二时刻，每个空间光调制器接收到的图像信号满足如下公式：
    Figure PCTCN2017114737-appb-100004
    其中，R为红色光的信号值，G为绿色光的信号值，B为蓝色光的信号值，YR为红色光的亮度值，YG为绿色光的亮度值，YB为蓝色光的亮度值，n为大于等于1的整数。
  9. 根据权利要求3或5或7所述的具有高对比度的显示系统，其特征在于，所述图像信号单元的m位图像信号提供给所述第一调制组合的n个m位图像信号的空间光调制器时，所述m位图像信号被转换为m位刺激信号，m位刺激信号被转换为m*n位刺激信号，m*n位刺激信号被转换为m*n位图像信号，m*n位图像信号被分解为n组m位图像信号并提供给n个空间光调制器。
  10. 一种具有高对比度的显示方法，其特征在于，所述方法包括：
    通过激发光源发出激发光；
    通过图像信号单元输出图像信号；
    通过图像算法单元接收所述图像信号并对所述图像信号分解后输出给调制单元；
    通过所述调制单元接收图像信号以对从所述激发光源接收到的激发光进行调制来得到高位灰阶的图像光；及
    通过图像输出单元将从所述调制单元接收到的高位灰阶的图像光处理为高对比度的图像后输出。
PCT/CN2017/114737 2017-08-24 2017-12-06 具有高对比度的显示系统及方法 Ceased WO2019037330A1 (zh)

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