WO2020135293A1

WO2020135293A1 - Display system

Info

Publication number: WO2020135293A1
Application number: PCT/CN2019/127268
Authority: WO
Inventors: 胡飞; 余新; 徐梦梦; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2018-12-29
Filing date: 2019-12-23
Publication date: 2020-07-02
Also published as: CN111381416B; CN111381416A

Abstract

A display system (10, 20), comprising: a laser light source (11, 21) for emitting laser light; a scanner (12, 22) located on a light emergent path of the laser light source (11, 21) and used for scanning the laser light at a pre-determined position to generate an image; a processing and control system (13, 23) for outputting a light source timing modulation signal (in(t)) to a light source modulation system (14, 24) according to an input image signal; and the light source modulation system (14, 24), which is used for adjusting the laser light source (11, 21) according to the light source timing modulation signal (in(t)), such that for at least some images, the laser light source (11, 21) emits laser light in a state of being beyond a rated power in some time periods of a frame of an image. The problem of it not being possible to improve the displayed peak brightness in a situation where the laser light source (11, 21) has been determined is solved, image display with a higher dynamic range is also realized, and the device costs generated by changing a high-power laser light source (11, 21) or increasing the number of laser light sources (11, 21) in order to achieve the maximum brightness of an image to be displayed are reduced.

Description

一种显示***A display system

技术领域Technical field

本发明涉及显示技术领域，特别是涉及一种显示***。The invention relates to the field of display technology, in particular to a display system.

背景技术Background technique

激光光源由于单色性能好、方向性强等特点在显示领域得到广泛应用。但激光光源长时间高功率工作会使得腔面温升过大，引发“热失控”而产生腔面融化，这种因腔面附近光功率密度过大导致激光光源产生不可逆破坏的现象称为COD(Catastrophic optical damage，灾变性光学损伤)。The laser light source is widely used in the display field due to its good monochromatic performance and strong directivity. However, the laser light source working for a long time and high power will cause the cavity surface temperature to rise too much, causing "thermal runaway" and causing the cavity surface to melt. This phenomenon of irreversible damage to the laser light source due to the excessive optical power density near the cavity surface is called COD. (Catastrophic optical damage, catastrophic optical damage).

因此，为避免激光光源因长时间高功率工作而产生COD，通常做法是将激光光源控制在不大于额定输出功率的状态下工作。这意味着在确定激光光源的条件下，图像显示最大亮度为激光光源额定工作的输出亮度，即图像峰值亮度无法提高，而通过更换高功率激光光源或增加激光光源数量的方式又会导致器件成本增加。Therefore, in order to prevent the laser light source from generating COD due to long-term high-power operation, it is common practice to control the laser light source to work under a state of not greater than the rated output power. This means that under the condition of determining the laser light source, the maximum brightness of the image display is the rated output brightness of the laser light source, that is, the peak brightness of the image cannot be increased, and the cost of the device will be increased by replacing the high-power laser light source or increasing the number of laser light sources. increase.

发明内容Summary of the invention

本发明提供一种显示***，能够解决现有光束扫描形式的投影***，在确定激光光源前提下，显示峰值亮度无法提高的问题。The invention provides a display system, which can solve the problem that the projection system of the existing beam scanning form cannot display the peak brightness under the premise of determining the laser light source.

本发明采用的一个技术方案是：提供一种显示***，包括：激光光源，用于发出激光；扫描器，位于所述激光光源的出射光路上，用于将所述激光在预定位置扫描产生图像；处理与控制***，根据输入的图像信号，输出光源时序调制信号i _n(t)至光源调制***；所述光源调制***，用于根据所述光源时序调制信号i _n(t)，调节所述激光光源，使得对于至少部分图像，所述激光光源在一帧图像的部分时段以超出额定功率的状态出射激光。 A technical solution adopted by the present invention is to provide a display system including: a laser light source for emitting laser light; a scanner located on an exit optical path of the laser light source for scanning the laser light at a predetermined position to generate an image ; processing and control system, in accordance with an input image signal, the output timing of the light source modulation signal i _n (t) to the light modulation system; the light modulation system, according to the light source modulation signal timing i _n (t), adjust the The laser light source is such that, for at least a part of the image, the laser light source emits laser light in a state exceeding the rated power for a partial period of one frame of the image.

在一种实施方式中，所述处理与控制***获取光源时序调制信号i _n(t)的步骤如下： In one embodiment, the processing and control system acquires a timing source modulation signal i _n (t) of the following steps:

步骤1：判断所述激光光源是否需要过载输出，若所述激光光源不需要过载输出，则根据一颜色子帧图像的亮度幅值信号L _in(t)，结合已知的激光光源亮度与激光光源电流之间的关系i＝f(L)，得到光源时序调制信号i _n(t)，反之，则进入步骤2； Step 1: determining whether the laser light source output overload, if the laser light source need not overloaded output, the amplitude of the luminance signal of a color image sub-frame L _in (t), in conjunction with known laser and the laser light source luminance the relationship between the source current i = f (L), to give a modulation signal timing source i _n (t), on the contrary, the process proceeds to step 2;

步骤2：判断所述激光光源是否可以通过安全过载恢复图像亮度，若所述激光光源可通过安全过载恢复图像亮度，则根据一颜色子帧图像的亮度幅值信号L _in(t)，结合已知的激光光源亮度与激光光源电流之间的关系i＝f(L)，得到光源时序调制信号i _n(t)；否则，根据一颜色子帧图像的调整亮度幅值信号L _un(t)，结合已知的激光光源亮度与激光光源电流之间的关系i＝f(L)，得到光源时序调制信号i _n(t)。 Step 2: Determine whether the laser light source can restore the image brightness through a safety overload. If the laser light source can restore the image brightness through a safety overload, according to the brightness amplitude signal L _in (t) of a color subframe image, combine i-known relationship between the laser light source and the laser source current brightness = f (L), to give a modulation signal timing source i _n (t); otherwise, the amplitude of the luminance signal according to the adjustment of a color image sub-frame L _un (t) , the binding relationship between i known laser light source luminance and the laser source current = f (L), to give a modulation signal timing source i _n (t).

在一种实施方式中，所述判断所述激光光源是否可以通过安全过载恢复图像亮度的步骤，包括：In one embodiment, the step of determining whether the laser light source can restore image brightness through a safety overload includes:

a.计算一颜色子帧图像时间T的像素占比R：a. Calculate the pixel ratio R of a color subframe image time T:

b.计算过载因子f(R,P,T _k)，当R小于等于1时，过载因子f(R,P,T _k)由像素占比R、激光光源COD损伤阈值P、激光光源寿命T _k共同确定，当R大于1时，过载因子f(R,P,T _k)等于1； b. Calculate the overload factor f(R,P,T _k ). When R is less than or equal to 1, the overload factor f(R,P,T _k ) consists of the pixel ratio R, the laser light source COD damage threshold P, and the laser light source life T _{k is} determined together, when R is greater than 1, the overload factor f (R, P, T _k ) is equal to 1;

c.计算过载亮度L _on，过载亮度L _on为过载因子f(R,P,T _k)与激光光源的额定输出亮度L _cn的乘积； c. Calculate the overload brightness L _on , the overload brightness L _on is the product of the overload factor f (R, P, T _k ) and the rated output brightness L _cn of the laser light source;

d.若L _on大于等于L _nmax，则所述激光光源可通过安全过载恢复图像亮度，否则所述激光光源无法通过安全过载恢复图像亮度；其中，L _nmax为一颜色子帧内图像亮度极值，即亮度幅值信号L _in(t)在一颜色子帧图像内的最大值。 d. If L _{on is} greater than or equal to L _nmax , the laser light source can restore the image brightness through a safety overload, otherwise the laser light source cannot restore the image brightness through a safety overload; where L _nmax is the extreme value of the image brightness within a color subframe , That is, the maximum value of the luminance amplitude signal L _in (t) in a color subframe image.

在一种实施方式中，所述判断是否需要所述激光光源过载输出的步骤，还包括：若所述亮度幅值信号L _in(t)在一颜色子帧图像内，存在大于L _cn的值，则激光光源需要过载工作，反之，激光光源无需过载工作；其中，L _cn为激光光源的额定输出亮度。 In one embodiment, the step of determining whether the laser light source needs to be overloaded further includes: if the brightness amplitude signal L _in (t) within a color subframe image, there is a value greater than L _cn , The laser light source needs to work overload, otherwise, the laser light source does not need overload work; where, L _cn is the rated output brightness of the laser light source.

在一种实施方式中，所述一颜色子帧图像的亮度幅值信号L _in(t)的获取步骤还包括：根据输入的所述图像信号，获取一颜色图像信号，其中该颜色图像信号包括若干颜色子帧图像，将该颜色子帧图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素灰度，得到沿扫描方向各所述子图像区域的灰度幅值信号G _in(t)，根据灰度与亮度关系曲线γ ₀，得到该颜色子帧图像的亮度幅值信号L _in(t)。 In one embodiment, the amplitude of the luminance signal of a color sub-frame image L _in (t) of acquiring further comprises the step of: based on said input image signal, obtaining a color image signal, wherein the color image signal including A plurality of color subframe images, the color subframe image is divided into a plurality of subimage regions along the spot scanning direction, and the grayscale amplitude of each subimage region along the scanning direction is obtained according to the maximum pixel grayscale of each subimage region The signal G _in (t) obtains the brightness amplitude signal L _in (t) of the color subframe image according to the relationship curve γ ₀ between gray scale and brightness.

在一种实施方式中，所述灰度与亮度关系曲线γ ₀满足以下关系：灰度与亮度呈单调递增的关系，即灰度越大，亮度越大。 In one embodiment, the relationship curve γ ₀ between grayscale and brightness satisfies the following relationship: grayscale and brightness have a monotonically increasing relationship, that is, the greater the grayscale, the greater the brightness.

在一种实施方式中，所述调整亮度幅值信号L _un(t)由灰度幅值信号G _in(t)结合重定义的灰度与亮度关系曲线γ _n(n＝1,2,3)得到。 In one embodiment, the adjusted brightness amplitude signal L _un (t) is a gray-scale amplitude signal G _in (t) combined with a redefined gray-to-luminance relationship curve γ _n (n=1, 2, 3 )get.

在一种实施方式中，所述重定义的灰度与亮度关系曲线γ ₁满足以下关系：当灰度小于等于G _cn，灰度与亮度的关系仍然满足曲线γ ₀；当灰度大于G _cn，同时灰度小于等于G _maxn时，亮度等于L _cn；其中，G _cn为所述激光光源输出的额定图像灰度，G _maxn为所述激光光源输出的最大图像灰度。 In one embodiment, the redefined relationship curve between gray and brightness γ ₁ satisfies the following relationship: when the gray is less than or equal to G _cn , the relationship between gray and brightness still satisfies the curve γ ₀ ; when the gray is greater than G _cn At the same time, when the gray scale is less than or equal to G _maxn , the brightness is equal to L _cn ; where G _cn is the rated image gray scale output by the laser light source, and G _maxn is the maximum image gray scale output by the laser light source.

在一种实施方式中，所述重定义的灰度与亮度关系曲线γ ₂满足以下关系：当灰度小于等于G _sn，灰度与亮度的关系仍然满足曲线γ ₀；当灰度大于等于G _sn且灰度小于等于G _maxn时，灰度与亮度呈线性递增关系，直至灰度与G _maxn相等时，亮度与L _cn相等；其中，G _sn为预设灰度值，G _sn大于零且G _sn小于等于G _cn；G _cn为所述激光光源输出的额定图像灰度，G _maxn为所述激光光源输出的最大图像灰度。 In one embodiment, the redefined relationship curve between grayscale and brightness γ ₂ satisfies the following relationship: when the grayscale is less than or equal to G _sn , the relationship between grayscale and brightness still satisfies the curve γ ₀ ; when the grayscale is greater than or equal to G _{When sn} and the gray level is less than or equal to G _maxn , the gray level and the brightness are linearly increasing until the gray level and G _maxn are equal, the brightness and L _cn are equal; where G _sn is the preset gray value, G _{sn is} greater than zero and G _{sn is} less than or equal to G _cn ; G _cn is the rated image gray scale output by the laser light source, and G _maxn is the maximum image gray scale output by the laser light source.

在一种实施方式中，所述重定义的灰度与亮度关系曲线γ ₃满足以下关系：当灰度小于等于G _sn，灰度与亮度的关系仍然满足曲线γ ₀；当灰度大于等于G _sn且灰度小于等于G _maxn时，灰度与亮度呈递增关系，增长速度先快后慢，即灰度与亮度关系曲线斜率越来越小，直至灰度与G _maxn相等时，亮度与L _cn相等；其中，G _sn为预设灰度值，G _sn大于零且G _sn小于等于G _cn；G _cn为所述激光光源输出的额定图像灰度，G _maxn为所述激光光源输出的最大图像灰度。 In one embodiment, the redefined relationship curve between grayscale and brightness γ ₃ satisfies the following relationship: when the grayscale is less than or equal to G _sn , the relationship between grayscale and brightness still satisfies the curve γ ₀ ; when the grayscale is greater than or equal to G _{When sn} and gray scale is less than or equal to G _maxn , gray scale and brightness show an increasing relationship, and the growth rate is fast and then slow, that is, the slope of the relationship curve between gray and brightness is getting smaller and smaller, until the gray and G _maxn are equal, the brightness and L _{cn is} equal; where G _sn is a preset gray value, G _{sn is} greater than zero and G _{sn is} less than or equal to G _cn ; G _cn is the rated image grayscale output by the laser light source, and G _maxn is the maximum output of the laser light source Image grayscale.

在一种实施方式中，还包括：空间光调制器，位于所述扫描器的出射光路上，用于根据所述处理与控制***的图像调制信号，对所述扫描器投射至其上的光斑进行调制，输出图像光。In one embodiment, the method further includes: a spatial light modulator, located on the exit optical path of the scanner, and used to project the light spot onto the scanner according to the image modulation signal of the processing and control system Modulate and output image light.

在一种实施方式中，所述处理与控制***，根据输入的图像信号，预测所述扫描器在所述空间光调制器表面扫描产生的图像，并输出所述图像调制信号至所述空间光调制器。In one embodiment, the processing and control system predicts the image generated by the scanner on the surface of the spatial light modulator according to the input image signal, and outputs the image modulation signal to the spatial light Modulator.

在一种实施方式中，所述空间光调制器为透射式液晶光阀或反射式液晶光阀。In one embodiment, the spatial light modulator is a transmissive liquid crystal light valve or a reflective liquid crystal light valve.

在一种实施方式中，还包括：平场聚焦透镜，位于所述扫描器的出射光路上，用于将所述扫描器输出的偏转光束线性扫描至预定位置。In one embodiment, it further comprises: a flat field focusing lens, located on the exit optical path of the scanner, for linearly scanning the deflected beam output by the scanner to a predetermined position.

在一种实施方式中，还包括：光学整形器件，位于所述光源***与所述扫描器之间的光路上，用于将所述光源***发出的光束引导至所述扫描器。In one embodiment, it further includes: an optical shaping device, located on the optical path between the light source system and the scanner, for guiding the light beam emitted by the light source system to the scanner.

本发明的有益效果是，区别于现有技术的情况，本发明提供一种显示***，包括激光光源、扫描器、处理与控制***、光源调制***。本发明在激光光源的额定输出亮度不满足欲显示图像的最大亮度的情况下，通过结合像素占比R、激光器COD损伤阈值、激光光源寿命，保证在不发生COD且激光光源寿命不受影响的条件下，使激光光源在短时间内于高于额定功率运行，以恢复图像原有亮度，解决了在已确定激光光源前提下，显示峰值亮度无法提高的问题，同时实现了更高动态范围的图像显示；另外，通过这种方式，节省了为达到欲显示图像的最大亮度而更换高功率激光光源或增加激光光源数量而产生的器件成本。The beneficial effect of the present invention is that, unlike the situation in the prior art, the present invention provides a display system including a laser light source, a scanner, a processing and control system, and a light source modulation system. In the case that the rated output brightness of the laser light source does not satisfy the maximum brightness of the image to be displayed, the present invention ensures that COD does not occur and the life of the laser light source is not affected by combining the pixel ratio R, the laser COD damage threshold, and the life of the laser light source. Under the conditions, the laser light source is operated above the rated power in a short time to restore the original brightness of the image, which solves the problem that the peak brightness of the display cannot be improved under the premise of the determined laser light source, and at the same time achieves a higher dynamic range Image display; in addition, in this way, the cost of the device resulting from replacing the high-power laser light source or increasing the number of laser light sources to achieve the maximum brightness of the image to be displayed is saved.

附图说明BRIEF DESCRIPTION

图1是本发明实施例1提供的一种显示***的结构示意图。FIG. 1 is a schematic structural diagram of a display system according to Embodiment 1 of the present invention.

图2是本发明实施例1中灰度与亮度关系曲线γ ₀的示例。 FIG. 2 is an example of the relationship curve γ ₀ between gray scale and brightness in Embodiment 1 of the present invention.

图3是本发明实施例1中重定义的灰度与亮度关系曲线γ ₁的示例。 FIG. 3 is an example of the relationship curve γ ₁ of grayscale and brightness redefined in Embodiment 1 of the present invention.

图4是本发明实施例1的一变形实施例中的重定义的灰度与亮度关系曲线γ ₂的示例。 FIG. 4 is an example of a redefined relationship curve γ ₂ between grayscale and brightness in a modified embodiment of Embodiment 1 of the present invention.

图5是本发明实施例1的另一变形实施例中的重定义的灰度与亮度关系曲线γ ₃的示例。 FIG. 5 is an example of a redefined grayscale-to-luminance relationship curve γ ₃ in another modified embodiment of Embodiment 1 of the present invention.

图6是本发明实施例2提供的一种显示***的结构示意图。6 is a schematic structural diagram of a display system according to Embodiment 2 of the present invention.

具体实施方式detailed description

请参阅图1，图1是本发明实施例1提供的一种显示***的结构示意图。如图1所示，本发明显示***10包括激光光源11、扫描器12、处理与控制***13、光源调制***14。激光光源11发出激光，扫描器12利用激光光源11发出的激光在预定位置扫描产生图像(图中未示出)。处理与控制***13根据输入的图像信号，输出光源时序调制信号i _n(t)至光源调制***14。光源调制***14，根据光源时序调制信号i _n(t)调节所述激光光源11，使得在激光光源11的额定输出亮度无法满足欲显示图像的部分像素亮度的情况下，对于至少部分图像，激光光源11在一帧图像的部分时段以超出额定功率的状态出射激光，并且确保当激光光源11超出额定功率工作时，不会发生COD现象。 Please refer to FIG. 1, which is a schematic structural diagram of a display system according to Embodiment 1 of the present invention. As shown in FIG. 1, the display system 10 of the present invention includes a laser light source 11, a scanner 12, a processing and control system 13, and a light source modulation system 14. The laser light source 11 emits laser light, and the scanner 12 uses the laser light emitted by the laser light source 11 to scan an image at a predetermined position (not shown). Process control system 13 and the image signal input 14, the output timing of the light source modulation signal i _n (t) to the light source modulation system. Light modulation system 14, the light source modulation signal timing i _n (t) adjusting the laser light source 11, so that the rated output luminance of the laser light source 11 can not satisfy the desire of the display pixel luminance portion of an image, for at least part of the image, the laser The light source 11 emits laser light in a state where the rated power is exceeded during a part of a frame of image, and ensures that when the laser light source 11 operates beyond the rated power, the COD phenomenon does not occur.

具体地，激光光源11发出激光，扫描器12利用激光光源11发出的激光在预定位置扫描产生图像。在本实施例中，预定位置为显示屏幕所在位置。优选地，扫描器12在显示屏幕表面扫描的激光光斑形状及尺寸与图像的一个像素的形状及尺寸相同或相近。Specifically, the laser light source 11 emits laser light, and the scanner 12 uses the laser light emitted by the laser light source 11 to scan at a predetermined position to generate an image. In this embodiment, the predetermined position is where the display screen is located. Preferably, the shape and size of the laser spot scanned by the scanner 12 on the surface of the display screen are the same or similar to the shape and size of one pixel of the image.

扫描器12可以是一个二维扫描镜、两个一维扫描镜级联的二维扫描镜、旋转多面镜、旋转扫描镜、MEMS(Micro-Electro-Mechanical System)振镜、电光晶体、声光晶体、光相控阵、液晶光偏转器件、利用共振的光纤扫描器件等。The scanner 12 may be a two-dimensional scanning mirror, two one-dimensional scanning mirrors cascaded two-dimensional scanning mirror, rotating polygon mirror, rotating scanning mirror, MEMS (Micro-Electro-Mechanical System) vibrating mirror, electro-optic crystal, acousto-optic Crystal, optical phased array, liquid crystal light deflection device, optical fiber scanning device using resonance, etc.

处理与控制***13根据输入的图像信号，将图像拆分为若干颜色的图像信号，获取一颜色图像信号，其中该颜色图像信号包括若干颜色子帧图像，将该颜色子帧图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素灰度，得到沿扫描方向各所述子图像区域的灰度幅值信号G _in(t)，再根据灰度与亮度关系曲线γ ₀，得到该颜色子帧图像的亮度幅值信号L _in(t)。灰度与亮度关系曲线γ ₀示例见图2。灰度与亮度关系曲线γ ₀满足以下关系：灰度与亮度呈单调递增的关系，即灰度越大，亮度越大。优选地，亮度为灰度的γ ₀次幂，其中，γ ₀＝2.2。 The processing and control system 13 splits the image into image signals of several colors according to the input image signal to obtain a color image signal, wherein the color image signal includes several color sub-frame images, and the color sub-frame image is along the spot scanning direction Divided into multiple sub-image areas, according to the maximum pixel gray of each sub-image area, the gray amplitude signal G _in (t) of each of the sub-image areas along the scanning direction is obtained, and then according to the relationship curve between gray and brightness γ _0, to obtain the amplitude of the luminance signal L _in (t) of the color sub-frame image. See Figure 2 for an example of the relationship between gray and brightness γ ₀ . The relationship curve between gray and brightness γ ₀ satisfies the following relationship: the relationship between gray and brightness is monotonically increasing, that is, the greater the gray, the greater the brightness. Preferably, the brightness is the γ ₀ power of grayscale, where γ ₀ =2.2.

举例而言，处理与控制***13根据输入的图像信号，将图像拆分为红、绿、蓝三色图像信号。以下以红色图像信号为例进行说明描述，绿色、蓝色图像信号可以参照红色图像信号的处理过程。For example, the processing and control system 13 splits the image into red, green, and blue image signals based on the input image signal. The following uses the red image signal as an example for description and description. For the green and blue image signals, refer to the processing procedure of the red image signal.

以红色图像信号为例，红色图像信号包括若干红色子帧图像信号，其中，每一红色子帧图像对应每一帧图像中的红色图像部分。将红色子帧图像沿光斑扫描方向分割成多个子图像区域，优选地，本实施例中，子图像区域的形状及尺寸与图像的一个像素相同。根据红色子帧图像中每一个子图像区域的最大像素灰度，得到沿扫描方向各所述子图像区域的灰度幅值信号G _ir(t)，红色子帧图像的灰度幅值信号G _ir(t)同时也可描述为扫描器12所处扫描时刻与该时刻扫描器12所指显示屏幕处应恢复的红色子帧图像灰度之间的关系。具体地，假设在0.001ms时，红色子帧的图像灰度幅值信号G _ir(t)对应的图像灰度为56，意味着扫描器12在0.001ms时刻，在显示屏幕处应恢复的红色图像灰度为56。获得红色子帧的图像灰度幅值信号G _ir(t)后，根据灰度与亮度关系曲线γ ₀，得到红色子帧图像亮度幅值信号L _ir(t)。灰度与亮度关系曲线γ ₀也可称为人眼亮度响应曲线，即人眼感受到的灰度与实际亮度之间的关系。灰度与亮度关系曲线γ ₀满足以下关系：灰度与亮度呈单调递增的关系，即灰度越大，亮度越大。一般公认的，亮度为灰度的γ ₀次幂，其中，γ ₀＝2.2。这意味着人眼对亮度的响应是非线性的，在较暗环境下，人眼对亮度的改变更为敏感；而在较亮的环境下，人眼对亮度的改变相对迟钝。 Taking the red image signal as an example, the red image signal includes several red subframe image signals, where each red subframe image corresponds to a red image portion in each frame image. The red sub-frame image is divided into multiple sub-image regions along the spot scanning direction. Preferably, in this embodiment, the sub-image region has the same shape and size as one pixel of the image. According to the maximum pixel gray of each sub-image area in the red sub-frame image, the gray amplitude signal G _ir (t) of each sub-image area along the scanning direction is obtained, and the gray amplitude signal G of the red sub-frame image _ir (t) can also be described as the relationship between the scanning time of the scanner 12 and the gray level of the red subframe image that should be restored at the display screen pointed to by the scanner 12 at that time. Specifically, suppose that at 0.001 ms, the image gray amplitude signal G _ir (t) of the red subframe corresponds to an image gray level of 56, which means that the scanner 12 should restore the red color at the display screen at the time of 0.001 ms. The grayscale of the image is 56. After obtaining the image gray amplitude signal G _ir (t) of the red subframe, the image luminance amplitude signal L _ir (t) of the red subframe is obtained according to the relationship curve between gray and brightness γ ₀ . The relationship curve between grayscale and brightness γ ₀ can also be called the human eye brightness response curve, that is, the relationship between the grayscale perceived by the human eye and the actual brightness. The relationship curve between gray and brightness γ ₀ satisfies the following relationship: the relationship between gray and brightness is monotonically increasing, that is, the greater the gray, the greater the brightness. It is generally accepted that the brightness is the γ ₀ power of grayscale, where γ ₀ =2.2. This means that the human eye's response to brightness is non-linear. In a darker environment, the human eye is more sensitive to changes in brightness; while in a brighter environment, the human eye is relatively insensitive to changes in brightness.

处理与控制***13得到一颜色子帧图像的亮度幅值信号L _in(t)后，获取光源时序调制信号i _n(t)的步骤如下： Processing and control system 13 to obtain a color sub-frame image luminance magnitude signal L _in (t), the timing of acquiring the light source modulation signal i _n (t) of the following steps:

步骤1：判断激光光源11是否需要过载输出，若所述亮度幅值信号L _in(t)在一颜色子帧图像内，存在大于L _cn的值，则激光光源11需要过载工作，反之，激光光11源无需过载工作；其中，L _cn为激光光源11的额定输出亮度。 Step 1: Determine whether the laser light source 11 needs to be overloaded. If the brightness amplitude signal L _in (t) has a value greater than L _cn in a color subframe image, the laser light source 11 needs to be overloaded, otherwise, the laser The light 11 source does not need to be overloaded; L _cn is the rated output brightness of the laser light source 11.

若激光光源11不需要过载输出，则根据一颜色子帧图像亮度幅值信号L _in(t)，结合已知的激光光源亮度与所述激光光源电流之间的关系i＝f(L)，得到光源时序调制信号i _n(t)，反之，则进入步骤2； When the laser light source 11 need not overloaded output, the color sub-frame image in accordance with an amplitude of the luminance signal L _in (t), i the relationship between the laser light source in conjunction with a known brightness of the laser source current = f (L), the light source modulation signal to obtain timing i _n (t), on the contrary, the process proceeds to step 2;

举例而言，得到红色子帧图像亮度幅值信号L _ir(t)后，判断在一红色子帧图像内，亮度幅值信号L _ir(t)是否存在大于红色激光光源的额定输出亮度L _cr的值，如果不存在，表明图像亮度幅值信号L _ir(t)在红色子帧内始终不大于红色激光光源的额定输出亮度L _cr，此时激光光源11无需过载输出，因此根据红色子帧图像亮度幅值信号L _ir(t)，结合已知的激光光源亮度与所述激光光源电流之间的关系i＝f(L)，得到红色激光的光源时序调制信号i _r(t)。对于确定的激光光源11，激光光源亮度与激光光源电流之间的关系i＝f(L)也是确定的，优选地，通过查询产品说明书等方式获得。在无法通过查询获得的情况下，亦可选择通过测量的方式拟合激光光源亮度与所述激光光源电流之间的关系曲线i＝f(L)。该关系曲线可存储于显示***的存储器中，待需要时调用查询。上述获取激光光源亮度与所述激光光源电流之间的关系i＝f(L)的方式可应用于本发明中所有实施例中。 After For example, to obtain a red image sub-frame luminance signal amplitude L _ir (t), is determined in a red sub-frame image, the amplitude of the luminance signal L _ir (t) whether there is a red laser light source is greater than the rated output luminance L _cr , If it does not exist, it means that the image brightness amplitude signal L _ir (t) in the red sub-frame is always not greater than the rated output brightness L _{cr of the} red laser light source. At this time, the laser light source 11 does not need to be overloaded, so according to the red sub-frame The image brightness amplitude signal L _ir (t), combined with the known relationship between the brightness of the laser light source and the current of the laser light source i=f(L), obtains the light source timing modulation signal i _r (t) of the red laser. For the determined laser light source 11, the relationship between the brightness of the laser light source and the current of the laser light source i=f(L) is also determined, preferably, obtained by querying the product specification or the like. In the case where it cannot be obtained through query, the curve i=f(L) of the relationship between the brightness of the laser light source and the current of the laser light source can also be selected by measuring. The relationship curve can be stored in the memory of the display system, and the query can be called when needed. The above-mentioned way of acquiring the relationship i=f(L) between the brightness of the laser light source and the current of the laser light source can be applied to all the embodiments of the present invention.

若在一红色子帧图像内亮度幅值信号L _ir(t)存在大于红色激光光源的额定输出亮度L _cr的值，则进入步骤2； If the luminance amplitude signal L _ir (t) in a red subframe image has a value greater than the rated output luminance L _cr of the red laser light source, then go to step 2;

步骤2：判断激光光源11是否可以通过安全过载恢复图像亮度，子步骤如下：Step 2: Determine whether the laser light source 11 can restore the image brightness through a safety overload. The sub-steps are as follows:

若所述激光光源可通过安全过载恢复图像亮度，则根据一颜色子帧图像的亮度幅值信号L _in(t)，结合已知的激光光源亮度与激光光源电流之间的关系i＝f(L)，得到光源时序调制信号i _n(t)；否则，根据一颜色子帧图像的调整亮度幅值信号L _un(t)，结合已知的激光光源亮度与激光光源电流之间的关系i＝f(L)，得到光源时序调制信号i _n(t)。 If the laser light source can overload recovery security image brightness, the amplitude of the luminance signal of a color image sub-frame L _in (t), i binding relationship between the known laser light source and the laser source current brightness = f ( L), to give a modulation signal timing source i _n (t); otherwise, the amplitude of the luminance signal according to the adjustment of a color image sub-frame L _un (t), i binding relationship between the known laser light source luminance of the laser light source current = f (L), to give a modulation signal timing source i _n (t).

调整亮度幅值信号L _un(t)由图像灰度幅值信号G _in(t)结合重定义的灰度与亮度关系曲线γ ₁得到。重定义的灰度与亮度关系曲线γ ₁示例见图3。重定义的灰度与亮度关系曲线γ ₁满足以下关系：当灰度小于等于G _cn，灰度与亮度的关系仍然满足曲线γ ₀；当灰度大于G _cn，同时灰度小于等于G _maxn时，亮度等于L _cn；其中，G _cn为所述激光光源输出的额定图像灰度，可由红色激光光源额定输出亮度L _cn根据灰度与亮度关系曲线γ ₀映射得到；G _maxn为所述激光光源输出的最大图像灰度，可由红色激光光源最大输出亮度L _maxn根据灰度与亮度关系曲线γ ₀映射得到。 The adjusted brightness amplitude signal L _un (t) is obtained from the image gray-scale amplitude signal G _in (t) combined with the redefined gray-scale and brightness relationship curve γ ₁ . An example of the redefined relationship between gray and brightness γ _{1 is} shown in Figure 3. The redefined relationship curve between gray and brightness γ ₁ satisfies the following relationship: when the gray is less than or equal to G _cn , the relationship between gray and brightness still satisfies the curve γ ₀ ; when the gray is greater than G _cn and the gray is less than or equal to G _maxn , The brightness is equal to L _cn ; wherein, G _cn is the rated image grayscale output by the laser light source, which can be obtained by mapping the red laser light source rated output brightness L _cn according to the grayscale and brightness relationship curve γ ₀ ; G _maxn is the laser light source The maximum output image gray scale can be obtained by mapping the maximum output brightness L _{maxn of the} red laser light source according to the gray scale and brightness relationship curve γ ₀ .

举例而言，在确定激光光源在11非过载工作情况下无法恢复图像亮度后，需通过进一步计算和判断来决定激光光源11是否可通过安全过载工作恢复图像亮度。For example, after it is determined that the laser light source cannot restore the image brightness under the condition of 11 non-overload operation, it is necessary to determine whether the laser light source 11 can restore the image brightness through safe overload operation through further calculation and judgment.

同样以红色激光光源为例，首先计算红色子帧图像时间T的像素占比R：Also taking the red laser light source as an example, first calculate the pixel ratio R of the red subframe image time T:

当R大于1，意味着红色激光光源无法在不影响激光光源寿命和不发生COD的情况下安全过载，这时过载因子f(R,P,T _k)取值1。 When R is greater than 1, it means that the red laser light source cannot be safely overloaded without affecting the life of the laser light source and without COD. At this time, the overload factor f(R,P,T _k ) takes the value 1.

当R小于等于1时，意味着红色激光光源可能可以通过安全过载的方式恢复图像亮度，这时过载因子由像素占比R、激光光源COD损伤阈值P、激光光源寿命T _k共同确定，此时过载因子f(R,P,T _k)表示：在不影响激光光源寿命和不发生COD的情况下红色激光光源可以过载的程度。 When R is less than or equal to 1, it means that the red laser light source may be able to restore the image brightness through a safe overload. At this time, the overload factor is determined by the pixel ratio R, the laser light source COD damage threshold P, and the laser light source life T _k . The overload factor f(R, P, T _k ) represents: the degree to which the red laser light source can be overloaded without affecting the life of the laser light source and without COD.

获得过载因子f(R,P,T _k)后，计算过载因子f(R,P,T _k)与红色激光光源的额定输出亮度L _cr的乘积，可得到红色激光光源安全过载时的过载亮度L _or。 After obtaining the overload factor f(R,P,T _k ), calculate the product of the overload factor f(R,P,T _k ) and the rated output brightness L _cr of the red laser light source to obtain the overload brightness when the red laser light source is safely overloaded L _or .

若L _or大于等于L _rmax，意味着红色激光光源的可安全过载的输出亮度L _or不小于红色子帧内图像亮度极大值L _rmax，即激光光源11可以通过安全过载恢复图像亮度，这时只需根据红色子帧图像亮度幅值信号L _ir(t)，结合已知的激光光源亮度与激光光源电流之间的关系i＝f(L)，得到红色激光的光源时序调制信号i _r(t)。 If L _{or is} greater than _or equal to L _rmax , it means that the output brightness of the red laser light source that can be safely overloaded L _or not is not less than the maximum value of the image brightness L _{rmax in the} red subframe, that is, the laser light source 11 can restore the image brightness through the safety overload. According to the red subframe image brightness amplitude signal L _ir (t), combined with the known relationship between the brightness of the laser light source and the laser light source current i=f(L), the light source timing modulation signal i _r ( t).

若L _or小于L _rmax，意味着红色激光光源可安全过载的输出亮度L _or小于红色子帧内图像亮度极大值L _rmax，即激光光源11若采用安全过载的方式工作，其输出亮度仍然无法使得图像中所有像素恢复原有的亮度，这时需要红色子帧图像的灰度幅值信号G _ir(t)结合重定义的灰度与亮度关系曲线γ ₁得到红色子帧图像的调整亮度幅值信号L _ur(t)。接着根据调整亮度幅值信号L _ur(t)，结合已知的激光光源亮度与所述激光光源电流之间的关系i＝f(L)，得到红色激光的光源时序调制信号i _r(t)。 If L _{or is} less than L _rmax , it means that the output brightness of the red laser light source can be safely overloaded L _or less than the maximum value of the image brightness L _{rmax in the} red subframe, that is, if the laser light source 11 works in a safe overload mode, its output brightness is still unable Make all the pixels in the image restore the original brightness, then the gray amplitude signal G _ir (t) of the red subframe image is combined with the redefined grayscale and brightness relationship curve γ _{1 to} obtain the adjusted brightness amplitude of the red subframe image Value signal L _ur (t). Then, according to the adjusted brightness amplitude signal L _ur (t), combined with the known relationship between the brightness of the laser light source and the current of the laser light source i=f(L), the light source timing modulation signal i _r (t) of the red laser light is obtained .

通过这种方法得到的调整亮度幅值信号L _un(t)无法完全恢复原有图像亮度。为使激光光源寿命不受影响或不发生COD，使得对于超出红色激光光源额定输出亮度的部分，红色激光光源均以激光光源11额额定亮度L _cn输出。根据调整亮度幅值信号L _un(t)，结合已知的激光光源亮度与所述激光光源电流之间的关系i＝f(L)，得到光源时序调制信号i _n(t)。其它颜色子帧的光源时序调制信号i _n(t)的获取方式类似，此处不再赘述。举例中，将图像拆分为红、绿、蓝三色图像信号仅为说明方便，本发明不限定图像信号的拆分方式。 The adjusted brightness amplitude signal L _un (t) obtained by this method cannot completely restore the original image brightness. In order to prevent the life of the laser light source from being affected or COD to occur, the red laser light source is output with the laser light source 11 rated brightness L _cn for the portion that exceeds the rated output brightness of the red laser light source. The amplitude of the signal to adjust the luminance L _un (t), i the relationship between the laser light source in conjunction with a known brightness of the laser source current = f (L), to give a modulation signal timing source i _n (t). Similar timing of a modulation signal source i _n (t) in the other color sub-frame acquisition mode is omitted here. In the example, splitting the image into red, green, and blue image signals is only for convenience of description, and the present invention does not limit the splitting method of the image signal.

获取光源时序调制信号i _n(t)后，处理与控制***13输出光源时序调制信号i _n(t)至光源调制***14；光源调制***14根据光源时序调制信号i _n(t)，调节所述激光光源11。 After obtaining the source timing adjustment signal i _n (t), the processing and control system 13 outputs a source timing of a modulation signal i _n (t) to the light modulation system 14; a light modulation system 14 in accordance with a light source timing adjustment signal i _n (t), adjust the Narrated laser light source 11.

在本实施例中，还可包括光学整形器件15和平场聚焦透镜16。光学整形器件15，设置于激光光源11与扫描器12之间的光路上，用于对激光光源11发出的光束进行整形，得到均匀且发散角较小的光束，并将光束引导至扫描器12。光学整形器件15可以为方棒或复眼透镜等光学器件。平场聚焦透镜16，设置于扫描器12与显示屏幕(图中未示出)之间的光路上，用于将扫描器12输出的偏转光束线性扫描至显示屏幕。通过这种方式，实现了扫描器12可在显示屏幕表面进行匀速的线性扫描。光学整形器件15和平场聚焦透镜16并非必要器件，亦可省略。In this embodiment, an optical shaping device 15 and a flat field focusing lens 16 may also be included. The optical shaping device 15 is disposed on the optical path between the laser light source 11 and the scanner 12, and is used to shape the light beam emitted by the laser light source 11 to obtain a uniform light beam with a small divergence angle, and guide the light beam to the scanner 12 . The optical shaping device 15 may be an optical device such as a square rod or a compound eye lens. The flat field focusing lens 16 is disposed on the optical path between the scanner 12 and the display screen (not shown in the figure), and is used to linearly scan the deflected light beam output by the scanner 12 to the display screen. In this way, the scanner 12 can perform linear scanning at a uniform speed on the display screen surface. The optical shaping device 15 and the flat field focusing lens 16 are not essential devices, and may be omitted.

实施例1中在激光光源不可通过安全过载工作恢复图像亮度的情况下，超出激光光源额定输出亮度的部分，激光光源均以额定亮度输出，即对于图像像素亮度高于激光光源额定输出亮度的部分，调整过后没有区分度，均以统一亮度输出，对于须表现亮度渐变过程的图像来说，该部分渐变过程无法体现。本发明的实施例1的第一变形实施例中，调整亮度幅值信号L _un(t)由图像灰度幅值信号G _in(t)结合重定义的灰度与亮度关系曲线γ ₂得到。重定义的灰度与亮度关系曲线γ ₂示例见图4。重定义的灰度与亮度关系曲线γ ₂满足以下关系：当灰度小于等于G _sn，灰度与亮度的关系仍然满足曲线γ ₀；当灰度大于等于G _sn且灰度小于等于G _maxn时，灰度与亮度呈线性递增关系，直至灰度与G _maxn相等时，亮度与L _cn相等；其中，G _sn为预设灰度值，G _sn大于零且G _sn小于等于G _cn；G _cn为所述激光光源输出的额定图像灰度，可由红色激光光源额定输出亮度L _cn根据灰度与亮度关系曲线γ ₀映射得到；G _maxn为所述激光光源输出的最大图像灰度，可由红色激光光源最大输出亮度L _maxn根据灰度与亮度关系曲线γ ₀映射得到。 In the case of Embodiment 1, when the laser light source cannot restore the image brightness through a safety overload operation, the part that exceeds the rated output brightness of the laser light source is output at the rated brightness, that is, the part where the image pixel brightness is higher than the rated output brightness of the laser light source After adjustment, there is no discrimination, and the output is uniform brightness. For images that have to express the brightness gradual change process, this part of the gradual change process cannot be reflected. In the first modified embodiment of Embodiment 1 of the present invention, the adjusted brightness amplitude signal L _un (t) is obtained from the image gray scale amplitude signal G _in (t) in combination with the redefined gray scale and brightness relationship curve γ ₂ . An example of the redefined relationship between gray and brightness γ _{2 is} shown in Figure 4. The redefined relationship curve between grayscale and brightness γ ₂ satisfies the following relationship: when grayscale is less than or equal to G _sn , the relationship between grayscale and brightness still meets the curve γ ₀ ; when grayscale is greater than or equal to G _sn and grayscale is less than or equal to G _maxn , Gray scale and brightness have a linear increasing relationship until the gray scale and G _maxn are equal, the brightness and L _cn are equal; where, G _sn is the preset gray value, G _{sn is} greater than zero and G _{sn is} less than or equal to G _cn ; G _cn Is the rated image grayscale output by the laser light source, which can be obtained by mapping the red laser light source rated output brightness L _cn according to the grayscale and brightness relationship curve γ ₀ ; G _maxn is the maximum image grayscale output by the laser light source, which can be obtained by the red laser The maximum output brightness L _{maxn of the} light source is obtained by mapping the relationship curve γ ₀ between gray scale and brightness.

通过这种方法得到的调整亮度幅值信号L _un(t)仍无法完全恢复原有图像亮度，为使激光光源寿命不受影响或不发生COD，令处于G _sn和G _maxn之间的灰度值呈线性递增的关系，直至灰度与G _maxn相等时，亮度与L _cn相等；通过这种方式，在灰度大于等于G _sn且灰度小于等于G _maxn的区间，图像亮度值均失真输出，失真区域与实施例1中的调整方式相比有所增加，但是可使得图像在该区域内，对于不同灰度可输出不同的亮度值，使得不同灰度的像素间亮度具有区分度。 The adjusted brightness amplitude signal L _un (t) obtained by this method still cannot fully restore the original image brightness. In order not to _{affect the} life of the laser light source or COD, the gray _level between G _sn and G _maxn The value is linearly increasing until the gray _{level is} equal to G _maxn , the brightness is equal to L _cn ; in this way, the image brightness value is distorted when the gray level is greater than or equal to G _sn and the gray level is less than or equal to G _maxn Compared with the adjustment method in Embodiment 1, the distortion area is increased, but the image can be output in this area and different brightness values can be output for different gray levels, so that the brightness between pixels of different gray levels can be distinguished.

本发明的另一变形实施例中，调整亮度幅值信号L _un(t)由图像灰度幅值信号G _in(t)结合重定义的灰度与亮度关系曲线γ ₃得到。重定义的灰度与亮度关系曲线γ ₃示例见图5。重定义的灰度与亮度关系曲线γ ₃满足以下关系：当灰度小于等于G _sn，灰度与亮度的关系仍然满足曲线γ ₀；当灰度大于等于G _sn且灰度小于等于G _maxn时，灰度与亮度呈递增关系，增长速度先快后慢，即灰度与亮度关系曲线斜率越来越小，直至灰度与G _maxn相等时，亮度与L _cn相等；其中，G _sn为预设灰度值，G _sn大于零且G _sn小于等于G _cn；G _cn为所述激光光源输出的额定图像灰度，可由红色激光光源额定输出亮度L _cn根据灰度与亮度关系曲线γ ₀映射得到；G _maxn为所述激光光源输出的最大图像灰度，可由红色激光光源最大输出亮度L _maxn根据灰度与亮度关系曲线γ ₀映射得到。 In another modified embodiment of the present invention, the adjusted brightness amplitude signal L _un (t) is obtained from the image gray scale amplitude signal G _in (t) in combination with the redefined gray scale and brightness relationship curve γ ₃ . An example of the redefined relationship between gray and brightness γ _{3 is} shown in Figure 5. The redefined relationship curve between grayscale and brightness γ ₃ satisfies the following relationship: when the grayscale is less than or equal to G _sn , the relationship between grayscale and brightness still satisfies the curve γ ₀ ; when the grayscale is greater than or equal to G _sn and the grayscale is less than or equal to G _maxn , the relationship between the gradation and the luminance was increasing the growth rate slow down after, i.e., the relationship between the luminance gradation curve slope smaller, until equal gradation _G maxn, is equal to the luminance L _cn; wherein, G _sn pre Set the gray value, G _{sn is} greater than zero and G _{sn is} less than or equal to G _cn ; G _cn is the rated image grayscale output by the laser light source, which can be mapped by the red laser light source rated output brightness L _cn according to the grayscale and brightness relationship curve γ ₀ G _maxn is the maximum image gray scale output by the laser light source, which can be obtained by mapping the maximum output brightness L _{maxn of the} red laser light source according to the gray scale and brightness relationship curve γ ₀ .

通过这种方式，在G _in(t)大于等于G _sn且G _in(t)小于等于G _maxn的区间，图像亮度值均失真输出，失真区域与实施例1中的调整方式相比有所增加，但在失真区域内，失真程度相对于实施例1的第一变形实施例减小，且同样可以实现对于同一亮度值，有且只有唯一的灰度值与之相对应，使得不同灰度的像素间亮度具有区分度。 In this way, in the interval where G _in (t) is greater than or equal to G _sn and G _in (t) is less than or equal to G _maxn , the image brightness values are all distorted, and the distortion area is increased compared to the adjustment method in Example 1. However, in the distortion area, the degree of distortion is reduced relative to the first modified embodiment of Embodiment 1, and it can also be achieved that for the same brightness value, there is only one gray value corresponding to it, so that different gray levels The brightness between pixels has a degree of distinction.

实施例1中，扫描器12直接在显示屏幕表面扫描形成图像，若要实现精确扫描，要求扫描的激光光斑形状及尺寸与图像的一个像素的形状及尺寸相同或相近，即对光斑的尺寸及形状要求较为严苛。本发明实施例2在实施例1的基础上，增加空间光调制器27，空间光调制器27位于所述扫描器12的出射光路上，用于对所述扫描器投射至其上的光斑进行调制，输出图像光。增加空间光调制器27，可以降低对光斑尺寸的要求，并可实现图像精确显示。In Embodiment 1, the scanner 12 directly scans and forms an image on the surface of the display screen. To achieve accurate scanning, the shape and size of the laser spot to be scanned are the same as or similar to the shape and size of one pixel of the image, that is, the size and size of the spot The shape requirements are more stringent. In the second embodiment of the present invention, on the basis of the first embodiment, a spatial light modulator 27 is added. The spatial light modulator 27 is located on the exit optical path of the scanner 12 and is used to perform a light spot projected onto it by the scanner. Modulate and output image light. Adding the spatial light modulator 27 can reduce the requirements on the spot size, and can realize accurate image display.

请参阅图6，图6是本发明实施例2提供的一种显示***的结构示意图。如图6所示，本发明显示***20包括：激光光源21、扫描器22、空间光调制器27、处理与控制***23、光源调制***24。激光光源21发出激光，激光被扫描器22通过光斑的形式在空间光调制器27的表面扫描，而后，经空间光调制器27调制而产生的图像光经投射出去形成显示图像(图中未示出)。处理与控制***23，根据输入的图像信号，输出光源时序调制信号i _n(t)至光源调制***24，并输出图像调制信号至空间光调制器27。空间光调制器27根据图像调制信号对扫描至其表面上的光斑进行调制，光源调制***24根据光源时序调制信号i _n(t)，调节光源***21的输出亮度。 Please refer to FIG. 6, which is a schematic structural diagram of a display system according to Embodiment 2 of the present invention. As shown in FIG. 6, the display system 20 of the present invention includes: a laser light source 21, a scanner 22, a spatial light modulator 27, a processing and control system 23, and a light source modulation system 24. The laser light source 21 emits laser light, and the laser light is scanned by the scanner 22 on the surface of the spatial light modulator 27 in the form of light spots, and then, the image light modulated by the spatial light modulator 27 is projected to form a display image (not shown in the figure) Out). Processing and control system 23, in accordance with an input image signal, the output timing of the light source modulation signal i _n (t) modulation system to the light source 24, a modulation signal and outputs the image to the spatial light modulator 27. The spatial light modulator 27 to scan the image modulated signal light spot on the surface thereof is modulated, the light source light modulation system 24 in accordance with a modulation signal timing i _n (t), adjust the output brightness of the light source system 21.

具体地，激光光源21发出激光光束，激光光束被扫描器22通过光斑的形式在空间光调制器27的表面扫描，而后，经空间光调制器27调制而产生的图像光经投射出去形成显示图像。其中，光斑对应所述空间光调制器27的多个像素。Specifically, the laser light source 21 emits a laser beam, and the laser beam is scanned by the scanner 22 on the surface of the spatial light modulator 27 in the form of a light spot, and then, the image light modulated by the spatial light modulator 27 is projected to form a display image . Wherein, the light spot corresponds to a plurality of pixels of the spatial light modulator 27.

优选地，可通过时序的方式调节激光光源21。举例而言，激光光源21为时序调节的红、绿、蓝三色激光光源。具体地，当红色激光光源开启时，绿色激光光源和蓝色激光光源关闭；绿色激光光源开启时，红色激光光源和蓝色激光光源关闭；蓝色激光光源开启时，红色激光光源和绿色激光光源关闭。Preferably, the laser light source 21 can be adjusted in a time-series manner. For example, the laser light source 21 is a red, green, and blue laser light source with timing adjustment. Specifically, when the red laser light source is turned on, the green laser light source and the blue laser light source are turned off; when the green laser light source is turned on, the red laser light source and the blue laser light source are turned off; when the blue laser light source is turned on, the red laser light source and the green laser light source shut down.

优选地，空间光调制器27为透射式液晶光阀或反射式液晶光阀。该类空间光调制器为“模拟型器件”，通过改变液晶取向并结合检偏器，实现对光束透过率的调节，一旦液晶取向调节完成，能够稳定的控制光透过率。Preferably, the spatial light modulator 27 is a transmissive liquid crystal light valve or a reflective liquid crystal light valve. This type of spatial light modulator is an "analog device". By changing the orientation of the liquid crystal and combining with the analyzer, the beam transmittance can be adjusted. Once the liquid crystal orientation adjustment is completed, the light transmittance can be stably controlled.

处理与控制***23，根据输入的图像信号，输出光源时序调制信号i _n(t)至光源调制***24，光源调制***24根据光源时序调制信号i _n(t)，调节光源***21的输出亮度。获取光源时序调制信号i _n(t)的方式可参照实施例1，此处不再赘述。 Processing and control system 23, an image signal input, the output of the light source timing of a modulation signal i _n (t) to the light modulation system 24, the light source modulation system 24 according to the light source timing adjustment signal i _n (t), to adjust the output brightness of the light source system 21 in accordance with . The light source modulation signal acquisition timing mode i _n (t) may Reference Example 1, embodiments herein omitted.

处理与控制***23，根据输入的图像信号，预测所述扫描器22在所述空间光调制器27表面扫描产生的图像，并与输入的图像信号对比，输出图像调制信号至所述空间光调制器27。图像调制信号中包含空间光调制器动作信息，即如何改变液晶取向以将表面光斑进一步调制得到精确图像的信息。空间光调制器27根据处理与控制***23输出的图像调制信号改变液晶取向，实现对光斑的进一步调制。The processing and control system 23 predicts the image generated by the scanner 22 scanning the surface of the spatial light modulator 27 according to the input image signal, and compares it with the input image signal to output the image modulation signal to the spatial light modulation器27. The image modulation signal contains the action information of the spatial light modulator, that is, information on how to change the orientation of the liquid crystal to further modulate the surface light spot to obtain an accurate image. The spatial light modulator 27 changes the orientation of the liquid crystal according to the image modulation signal output by the processing and control system 23 to achieve further modulation of the light spot.

在本实施例中，还可包括光学整形器件25和平场聚焦透镜26，光学整形器件组25和平场聚焦透镜组26可参照实施例1进行，与实施例1相同，光学整形器件25、平场聚焦透镜26并非必要器件。In this embodiment, the optical shaping device 25 and the flat field focusing lens 26 can also be included. The optical shaping device group 25 and the flat field focusing lens group 26 can be carried out with reference to Embodiment 1. The same as in Embodiment 1, the optical shaping device 25 and the flat field The focusing lens 26 is not a necessary device.

实施例2中，激光光源21通过时序的方式控制每种颜色激光光源的开启与关闭，每种颜色激光光源的开启时间对应一颜色子帧的时间，各颜色子帧时间之和为一帧图像时间。因此，相应地，扫描器22需要在一颜色子帧时间内遍历空间光调制器27且光源调制***24需要在一颜色子帧的时间内完成电流调制以使激光光源21输出所需亮度。这对于扫描器22的扫描速度和光源调制***24的电流调制速度都是很大的考验。实施例2的一个变形实施例中，采用双激光光源、双扫描器及双空间光调制器。具体地，双激光光源其中一个激光光源采取时序控制方式，另一激光光源在一帧时间内几乎处于常开启状态。举例而言，将一帧图像时间分为前半帧图像时间和后半帧图像时间。在前半帧图像时间内，红色激光光源开启，绿色激光光源开启，蓝色激光光源关闭；在后半帧图像时间内，红色激光光源关闭，绿色激光光源开启，蓝色激光光源开启。不管在前半帧图像时间还是后半帧图像时间，都有两种颜色激光光源同时开启，开启的两种颜色激光光源发出激光光束，激光光束分别被两个扫描器通过光斑的形式在对应的空间光调制器的表面扫描，而后，对两个空间光调制器调制而产生的图像光进行合光，最终投射出去形成显示图像。In Embodiment 2, the laser light source 21 controls the turn-on and turn-off of each color laser light source in a time series manner. The turn-on time of each color laser light source corresponds to the time of one color subframe, and the sum of the time of each color subframe is one frame of image time. Therefore, accordingly, the scanner 22 needs to traverse the spatial light modulator 27 within one color subframe time and the light source modulation system 24 needs to complete current modulation within one color subframe time so that the laser light source 21 outputs the required brightness. This is a great test for the scanning speed of the scanner 22 and the current modulation speed of the light source modulation system 24. In a modified embodiment of Embodiment 2, dual laser light sources, dual scanners, and dual spatial light modulators are used. Specifically, one laser light source of the dual laser light sources adopts a timing control mode, and the other laser light source is almost in a normally-on state within a frame time. For example, the image time of one frame is divided into the image time of the first half frame and the image time of the second half frame. During the first half of the image period, the red laser light source is turned on, the green laser light source is turned on, and the blue laser light source is turned off; during the second half frame image time, the red laser light source is turned off, the green laser light source is turned on, and the blue laser light source is turned on. Regardless of the image time of the first half of the frame or the image time of the second half of the frame, two color laser light sources are turned on at the same time. The two color laser light sources that are turned on emit laser beams, and the laser beams are respectively passed by the two scanners in the form of light spots in the corresponding space. The surface of the light modulator is scanned, and then the image light modulated by the two spatial light modulators is combined, and finally projected to form a display image.

本实施例中其他各器件工作方式及调制方法可参照上述各实施例，此处不再赘述。For the working modes and modulation methods of other devices in this embodiment, refer to the foregoing embodiments, and details are not described herein again.

与实施例2相比，本实施例采用双激光光源、双扫描器及双空间光调制器的方式，其中一个扫描器只需在半帧图像时间内遍历其对应的空间光调制器，另外一个扫描器只需在一帧图像时间内遍历其对应的空间光调制器，同时对光源调制***的电流调制速度的要求也大大降低。Compared with Embodiment 2, this embodiment uses a dual laser light source, a dual scanner, and a dual spatial light modulator. One scanner only needs to traverse its corresponding spatial light modulator within half a frame of image time, and the other one The scanner only needs to traverse its corresponding spatial light modulator within a frame of image time, and the requirements for the current modulation speed of the light source modulation system are also greatly reduced.

实施例2的另一实施例中，三种颜色激光光源同时开启，并配合采用三个扫描器及三个空间光调制器。在一帧图像时间内，三种颜色激光光源同时发出激光光束，三种颜色激光光束分别被三个扫描器通过光斑的形式在对应的空间光调制器的表面扫描，而后，对三个空间光调制器调制而产生的图像光进行合光，最终投射出去形成显示图像。通过这种方式，可进一步降低对扫描器的扫描速度和光源调制***的电流调制速度的要求。本实施例中其他各器件工作方式及调制方法可参照上述各实施例，此处不再赘述。In another embodiment of Embodiment 2, three color laser light sources are turned on simultaneously, and three scanners and three spatial light modulators are used in conjunction. During a frame of image time, three color laser light sources simultaneously emit laser beams. The three color laser beams are respectively scanned by the three scanners on the surface of the corresponding spatial light modulator in the form of light spots, and then, the three spatial light The image light generated by the modulator is combined, and finally projected to form a display image. In this way, the requirements on the scanning speed of the scanner and the current modulation speed of the light source modulation system can be further reduced. For the working modes and modulation methods of other devices in this embodiment, refer to the foregoing embodiments, and details are not described herein again.

以上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。The above are only the embodiments of the present invention, and therefore do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by the description and drawings of the present invention, or directly or indirectly used in other related technical fields, The same reason is included in the patent protection scope of the present invention.

Claims

一种显示***，其特征在于，包括：A display system, characterized in that it includes:

激光光源，用于发出激光；Laser light source, used to emit laser;

扫描器，位于所述激光光源的出射光路上，用于将所述激光在预定位置扫描产生图像；A scanner, located on the exit optical path of the laser light source, for scanning the laser at a predetermined position to generate an image;

处理与控制***，根据输入的图像信号，输出光源时序调制信号i _n(t)至光源调制***； Processing and control system, in accordance with an input image signal, the output timing of the light source modulation signal i _n (t) to the light modulation system;

所述光源调制***，用于根据所述光源时序调制信号i _n(t)，调节所述激光光源，使得对于至少部分图像，所述激光光源在一帧图像的部分时段以超出额定功率的状态出射激光。 The light modulation system, according to the light source modulation signal timing i _n (t), adjusting the laser light source, such that for at least part of the image, the laser light source in a state beyond the rated power in a period of a portion of an image Exit the laser.
根据权利要求1所述的显示***，其特征在于，所述处理与控制***获取光源时序调制信号i _n(t)的步骤如下： The display system according to claim 1, wherein said processing timing source modulation signal i _n (t) step acquisition and control systems as follows:

步骤1：判断所述激光光源是否需要过载输出，若所述激光光源不需要过载输出，则根据一颜色子帧图像的亮度幅值信号L _in(t)，结合已知的激光光源亮度与激光光源电流之间的关系i＝f(L)，得到光源时序调制信号i _n(t)，反之，则进入步骤2； Step 1: determining whether the laser light source output overload, if the laser light source need not overloaded output, the amplitude of the luminance signal of a color image sub-frame L _in (t), in conjunction with known laser and the laser light source luminance the relationship between the source current i = f (L), to give a modulation signal timing source i _n (t), on the contrary, the process proceeds to step 2;

步骤2：判断所述激光光源是否可以通过安全过载恢复图像亮度，若所述激光光源可通过安全过载恢复图像亮度，则根据一颜色子帧图像的亮度幅值信号L _in(t)，结合已知的激光光源亮度与激光光源电流之间的关系i＝f(L)，得到光源时序调制信号i _n(t)；否则，根据一颜色子帧图像的调整亮度幅值信号L _un(t)，结合已知的激光光源亮度与激光光源电流之间的关系i＝f(L)，得到光源时序调制信号i _n(t)。 Step 2: Determine whether the laser light source can restore the image brightness through a safety overload. If the laser light source can restore the image brightness through a safety overload, according to the brightness amplitude signal L _in (t) of a color subframe image, combine i-known relationship between the laser light source and the laser source current brightness = f (L), to give a modulation signal timing source i _n (t); otherwise, the amplitude of the luminance signal according to the adjustment of a color image sub-frame L _un (t) , the binding relationship between i known laser light source luminance and the laser source current = f (L), to give a modulation signal timing source i _n (t).
根据权利要求2所述的显示***，其特征在于，所述判断所述激光光源是否可以通过安全过载恢复图像亮度的步骤，包括：The display system according to claim 2, wherein the step of determining whether the laser light source can restore the image brightness through a safety overload includes:

a.计算一颜色子帧图像时间T的像素占比R：a. Calculate the pixel ratio R of a color subframe image time T:

b.计算过载因子f(R,P,T _k)，当R小于等于1时，过载因子f(R,P,T _k)由像素占比R、激光光源COD损伤阈值P、激光光源寿命T _k共同确定，当R大于1时，过载因子f(R,P,T _k)等于1； b. Calculate the overload factor f(R,P,T _k ). When R is less than or equal to 1, the overload factor f(R,P,T _k ) consists of the pixel ratio R, the laser light source COD damage threshold P, and the laser light source life T _{k is} determined together, when R is greater than 1, the overload factor f (R, P, T _k ) is equal to 1;

c.计算过载亮度L _on，过载亮度L _on为过载因子f(R,P,T _k)与激光光源的额定输出亮度L _cn的乘积； c. Calculate the overload brightness L _on , the overload brightness L _on is the product of the overload factor f (R, P, T _k ) and the rated output brightness L _cn of the laser light source;

d.若L _on大于等于L _nmax，则所述激光光源可通过安全过载恢复图像亮度，否则所述激光光源无法通过安全过载恢复图像亮度；其中，L _nmax为一颜色子帧内图像亮度极值，即亮度幅值信号L _in(t)在一颜色子帧图像内的最大值。 d. If L _{on is} greater than or equal to L _nmax , the laser light source can restore the image brightness through a safety overload, otherwise the laser light source cannot restore the image brightness through a safety overload; where L _nmax is the extreme value of the image brightness within a color subframe , That is, the maximum value of the luminance amplitude signal L _in (t) in a color subframe image.
根据权利要求2所述的显示***，其特征在于，所述判断是否需要所述激光光源过载输出的步骤，还包括：The display system according to claim 2, wherein the step of determining whether an overload output of the laser light source is required further includes:

若所述亮度幅值信号L _in(t)在一颜色子帧图像内，存在大于L _cn的值，则激光光源需要过载工作，反之，激光光源无需过载工作；其中，L _cn为激光光源的额定输出亮度。 If the brightness amplitude signal L _in (t) has a value greater than L _cn in a color sub-frame image, the laser light source needs to be overloaded, otherwise, the laser light source does not need to be overloaded; where L _cn is the laser light source’s Rated output brightness.
根据权利要求2所述的显示***，其特征在于，所述一颜色子帧图像的亮度幅值信号L _in(t)的获取步骤还包括： The display system according to claim 2, wherein the amplitude of the luminance signal of a color sub-frame image L _in (t) the step of obtaining further comprises:

根据输入的所述图像信号，获取一颜色图像信号，其中该颜色图像信号包括若干颜色子帧图像，将该颜色子帧图像沿光斑扫描方向分割成多个子图像区域，根据每一个子图像区域的最大像素灰度，得到沿扫描方向各所述子图像区域的灰度幅值信号G _in(t)，根据灰度与亮度关系曲线γ ₀，得到该颜色子帧图像的亮度幅值信号L _in(t)。 Obtain a color image signal according to the input image signal, wherein the color image signal includes a plurality of color subframe images, the color subframe image is divided into a plurality of subimage areas along the spot scanning direction, according to each subimage area Maximum pixel gray scale, to obtain the gray scale amplitude signal G _in (t) of each of the sub-image areas along the scanning direction, according to the gray scale and brightness relationship curve γ ₀ , to obtain the brightness amplitude signal L _{in of} the color sub-frame image (t).
根据权利要求5所述的显示***，其特征在于，所述灰度与亮度关系曲线γ ₀满足以下关系：灰度与亮度呈单调递增的关系，即灰度越大，亮度越大。 The display system according to claim 5, characterized in that the relationship curve γ _{0 of} grayscale and brightness satisfies the following relationship: the grayscale and brightness are monotonically increasing, that is, the greater the grayscale, the greater the brightness.
根据权利要求2所述的显示***，其特征在于，所述调整亮度幅值信号L _un(t)由灰度幅值信号G _in(t)结合重定义的灰度与亮度关系曲线γ _n(n＝1,2,3)得到。 The display system according to claim 2, wherein the adjusted brightness amplitude signal L _un (t) is a gray-scale amplitude signal G _in (t) combined with a redefined relationship curve between gray and brightness γ _n ( n=1, 2, 3).
根据权利要求7所述的显示***，其特征在于，所述重定义的灰度与亮度关系曲线γ ₁满足以下关系：当灰度小于等于G _cn，灰度与亮度的关系仍然满足曲线γ ₀；当灰度大于G _cn，同时灰度小于等于G _maxn时，亮度等于L _cn；其中，G _cn为所述激光光源输出的额定图像灰度，G _maxn为所述激光光源输出的最大图像灰度。 The display system according to claim 7, wherein the redefined relationship curve between grayscale and brightness γ ₁ satisfies the following relationship: when the grayscale is less than or equal to G _cn , the relationship between grayscale and brightness still satisfies the curve γ ₀ ; When the gray scale is greater than G _cn and the gray scale is less than or equal to G _maxn , the brightness is equal to L _cn ; where, G _cn is the rated image gray scale output by the laser light source, and G _maxn is the maximum image gray output by the laser light source degree.
根据权利要求7所述的显示***，其特征在于，所述重定义的灰度与亮度关系曲线γ ₂满足以下关系：当灰度小于等于G _sn，灰度与亮度的关系仍然满足曲线γ ₀；当灰度大于等于G _sn且灰度小于等于G _maxn时，灰度与亮度呈线性递增关系，直至灰度与G _maxn相等时，亮度与L _cn相等；其中，G _sn为预设灰度值，G _sn大于零且G _sn小于等于G _cn；G _cn为所述激光光源输出的额定图像灰度，G _maxn为所述激光光源输出的最大图像灰度。 The display system according to claim 7, wherein the redefined relationship curve between grayscale and brightness γ ₂ satisfies the following relationship: when the grayscale is less than or equal to G _sn , the relationship between grayscale and brightness still satisfies the curve γ ₀ ; When the gray level is greater than or equal to G _sn and the gray level is less than or equal to G _maxn , the gray level and the brightness are linearly increasing until the gray level and G _maxn are equal, the brightness and L _cn are equal; where, G _sn is the preset gray level Value, G _{sn is} greater than zero and G _{sn is} less than or equal to G _cn ; G _cn is the rated image gray scale output by the laser light source, and G _maxn is the maximum image gray scale output by the laser light source.
根据权利要求7所述的显示***，其特征在于，所述重定义的灰度与亮度关系曲线γ ₃满足以下关系：当灰度小于等于G _sn，灰度与亮度的关系仍然满足曲线γ ₀；当灰度大于等于G _sn且灰度小于等于G _maxn时，灰度与亮度呈递增关系，增长速度先快后慢，即灰度与亮度关系曲线斜率越来越小，直至灰度与G _maxn相等时，亮度与L _cn相等；其中，G _sn为预设灰度值，G _sn大于零且G _sn小于等于G _cn；G _cn为所述激光光源输出的额定图像灰度，G _maxn为所述激光光源输出的最大图像灰度。 The display system according to claim 7, wherein the redefined relationship curve between grayscale and brightness γ ₃ satisfies the following relationship: when the grayscale is less than or equal to G _sn , the relationship between grayscale and brightness still satisfies the curve γ ₀ ; When the gray scale is greater than or equal to G _sn and the gray scale is less than or equal to G _maxn , the gray scale and the brightness show an increasing relationship, and the growth rate is fast and then slow, that is, the slope of the relationship curve between gray and brightness is getting smaller and smaller, until the gray and G _{When maxn is} equal, the brightness is equal to L _cn ; where G _sn is the preset gray value, G _{sn is} greater than zero and G _{sn is} less than or equal to G _cn ; G _cn is the rated image gray scale output by the laser light source, G _maxn is The maximum image gray level output by the laser light source.
根据权利要求1～10中任一项所述的显示***，其特征在于，还包括：The display system according to any one of claims 1 to 10, further comprising:

空间光调制器，位于所述扫描器的出射光路上，用于根据所述处理与控制***的图像调制信号，对所述扫描器投射至其上的光斑进行调制，输出图像光。The spatial light modulator is located on the exit optical path of the scanner and is used to modulate the light spot projected on the scanner according to the image modulation signal of the processing and control system to output image light.
根据权利要求11所述的显示***，其特征在于，所述处理与控制***，根据输入的图像信号，预测所述扫描器在所述空间光调制器表面扫描产生的图像，并输出所述图像调制信号至所述空间光调制器。The display system according to claim 11, wherein the processing and control system predicts the image generated by the scanner scanning on the surface of the spatial light modulator according to the input image signal, and outputs the image Modulate the signal to the spatial light modulator.
根据权利要求11所述的显示***，其特征在于，所述空间光调制器为透射式液晶光阀或反射式液晶光阀。The display system according to claim 11, wherein the spatial light modulator is a transmissive liquid crystal light valve or a reflective liquid crystal light valve.
根据权利要求1～10中任一项所述的显示***，其特征在于，还包括：The display system according to any one of claims 1 to 10, further comprising:

平场聚焦透镜，位于所述扫描器的出射光路上，用于将所述扫描器输出的偏转光束线性扫描至预定位置。A flat field focusing lens is located on the exit optical path of the scanner and is used to linearly scan the deflected beam output by the scanner to a predetermined position.
根据权利要求1～10中任一项所述的显示***，其特征在于，还包括：The display system according to any one of claims 1 to 10, further comprising:

光学整形器件，位于所述光源***与所述扫描器之间的光路上，用于将所述光源***发出的光束引导至所述扫描器。An optical shaping device, located on the optical path between the light source system and the scanner, is used to guide the light beam emitted by the light source system to the scanner.