TWI769058B - Calibration method and system of stereoscopic display - Google Patents

Abstract

A calibration method of a stereoscopic display includes: providing a stereoscopic display including a display and an image divider disposed on the display, wherein the display includes a plurality of sets of pixels arranged alternately; turning on one set of the sets of the pixels, and measuring a light shape distribution of the one set of the pixels through the image divider; determining whether peaks of the light shape distribution are located within a predetermined view zone corresponding to the one set of pixels; make another set of pixels correspond to the predetermined view zone in response to the peaks of the light shape distribution are not located within the predetermined view zone; finishing calibration or turn on another set of pixels to continue calibration.

Description

Stereoscopic display calibration method and system

The present invention relates to a method and system for calibrating a display, and more particularly, to a method and system for calibrating a stereoscopic display.

Stereoscopic displays can be divided into glasses-wearing stereoscopic displays and naked-eye stereoscopic displays. In naked-eye stereoscopic displays, parallax barriers or lenticular lens plates can be used to form multiple viewing fields at different positions in space, while stereoscopic displays provide different images. to a different field of view.

The lenticular lens plate has a plurality of lenticular lenses arranged in parallel. Generally, when viewing a three-dimensional image of the lenticular lens, because the image to be viewed is placed under these lenticular lenses, the plane on which it is placed is also the focal point of the lenticular lens. . Therefore, when viewing an image from outside the lens into the lens, all parallel lines of sight converge to the focal point of the lenticular lens and see the image below the lenticular lens. The human eye sees different images because it is in different fields of view. Therefore, when a plurality of patterns with different viewing angles are placed under the lenticular lens plate, the image must be divided into a plurality of thin strip-shaped images, and then a plurality of different images must be fused in sequence.

When the lenticular lens plate is attached to the display, the pixels of the display can be divided into multiple groups of pixels arranged alternately, and different groups of pixels are used to provide images of different viewing areas. When the lenticular lens plate is correctly attached to the predetermined position on the display, the light respectively provided by the plurality of groups of pixels will be transmitted to the correct field of view. However, when the position where the lenticular lens plate is attached is wrong, the light of the multiple groups of pixels will be transmitted to the wrong field of view due to the deviation of the position of the lenticular lens. As a result, the stereoscopic display will not be able to correctly display the stereoscopic image.

The present invention provides a method for calibrating a stereoscopic display, which can correct the influence of the disposition error of the image separator on the stereoscopic vision.

The present invention provides a correction system for a stereoscopic display, which can correct the influence on the stereoscopic vision caused by the disposition error of the image separator in the stereoscopic display.

An embodiment of the present invention provides a method for calibrating a stereoscopic display, including: providing a stereoscopic display, the stereoscopic display includes a display and an image separator disposed on the display, the display includes multiple groups of pixels arranged alternately; One of a group of pixels in the group of pixels, and measure the light shape distribution generated by this group of pixels through the image separator; determine whether the peak of the light shape distribution falls within the preset field of view corresponding to this group of pixels ; The wave peaks reflected in the light shape distribution do not fall in the preset field of view, but another set of pixels corresponds to the preset field of view; and the peaks reflected in the light shape distribution fall in the preset field of view, and the end Correction or light another set of pixels to continue the correction.

An embodiment of the present invention provides a system for calibrating a stereoscopic display for calibrating a stereoscopic display. The stereoscopic display includes a display and an image separator disposed on the display. The calibration system of the stereoscopic display includes a controller and a light intensity detector. The controller is used for being electrically connected to the stereoscopic display, and used for instructing the display to light up one of the plurality of alternately arranged pixels. The light intensity detector is electrically connected to the controller, and is used for measuring the light intensity emitted by the group of pixels in multiple viewing fields in space. The controller is used for judging whether the peak of the light distribution generated by the group of pixels through the image splitter falls within the preset view corresponding to the group of pixels according to the light intensity measured by the light intensity detector in these viewing areas. in the domain. The controller is used for instructing the display to use another group of pixels to correspond to the preset viewing area in response to the wave peak of the light shape distribution not falling in the preset viewing area. The controller is used for finishing the calibration or lighting another group of pixels to continue the calibration in response to the peak of the light distribution falling within the preset viewing area.

In the calibration method and calibration system of the stereoscopic display according to the embodiment of the present invention, the light distribution generated by the group of pixels passing through the image separator is determined according to the light intensity measured by the light intensity detector in these viewing areas. Whether the peak of the wave falls in the preset field of view corresponding to this group of pixels, so the stereoscopic display can be corrected by electronic control after configuring the image splitter. In this way, the requirements on the alignment accuracy of the image separator in the process can be reduced, the process yield can be improved, and the process speed can be accelerated.

1 is a flowchart of a method for calibrating a stereoscopic display according to an embodiment of the present invention, FIG. 2 is a schematic diagram of a stereoscopic display according to an embodiment of the present invention when the image separator is assembled without error, and FIG. 3A is an embodiment of the present invention. The calibration system of the stereoscopic display of the embodiment and the stereoscopic display before calibration, and FIG. 3B is the calibration system of the stereoscopic display of FIG. 3A and the stereoscopic display after calibration. Referring to FIG. 1 , FIG. 2 , FIG. 3A and FIG. 3B , the stereoscopic display 100 of this embodiment includes a display 110 and an image separator 120 disposed on the display 110 . In this embodiment, the display 110 is, for example, a liquid crystal display panel (LCD panel), an organic light-emitting diode display panel (OLED display panel), and a light-emitting diode display panel. , plasma display panel or other suitable display panel. The image separator 120 is, for example, a lenticular lens plate or a parallax barrier commonly used in naked-eye stereoscopic displays, and a lenticular lens plate is used as an example in FIG. 2 . The display 110 has multiple groups of alternately arranged pixels (in FIG. 2 , five groups of pixels, namely, pixel 1, pixel 2, pixel 3, pixel 4, and pixel 5, are taken as examples).

In this embodiment, the image separator 120 is a lenticular lens plate, which includes a plurality of lenticular lenses 122 , each lenticular lens 122 extends along a first direction D1 , and the lenticular lenses 122 extend along a first direction D1 Arranged in two directions D2. Each lenticular lens 122 has a curved surface in the second direction D2 and a straight surface in the first direction D1. In addition, in this embodiment, the first direction D1 is, for example, perpendicular to the second direction D2. The lights L1, L2, L3, L4 and L5 emitted by the pixel 1, the pixel 2, the pixel 3, the pixel 4 and the pixel 5, respectively, are transmitted to the visual fields V1, V2, V3, V4 and V5. Pixel 1, Pixel 2, Pixel 3, Pixel 4, and Pixel 5 provide images with different viewing angles to V1, V2, V3, V4, and V5, respectively. When the user's left eye and right eye are located at two When the visual field is different, the left eye and the right eye can see images from two different perspectives, which produces a three-dimensional perception in the brain.

When the lenticular lens 122 is assembled (eg, attached) to the display 110 and the position is misaligned and shifted, the phenomenon shown in FIG. 3A may occur. At this time, the lights L2, L3, L4, L5 and L1 generated by pixel 2, pixel 3, pixel 4, pixel 5 and pixel 1 are transmitted to the visual fields V1, V2, V3, V4 and V5, respectively, That is to say, the user will see the lights L2, L3, L4, L5 and L1 in the fields of view V1, V2, V3, V4 and V5 that do not belong to these fields of view, resulting in errors in the stereoscopic image, especially when The error is particularly apparent when the user's eyes see the lights L5 and L1 in the visual fields V4 and V5, respectively. This is because the viewing angles of the images generated by pixel 1 to pixel 5 change sequentially. If both eyes see the lights L5 and L1, they will see two images with greatly different viewing angles, and the lights L5 and L1 The order of viewing angle changes is also incorrect in the viewing area V4 and the viewing area V5, respectively.

Therefore, in this embodiment, through software or hardware circuit control, pixel 2 in FIG. 3A is regarded as pixel 1 (as shown in FIG. 3B ), and pixel 3 in FIG. 3A is regarded as pixel 2 (as shown in FIG. 3B ) ), the pixel 4 in FIG. 3A is regarded as the pixel 3 (as shown in FIG. 3B ), the pixel 5 in FIG. 3A is regarded as the pixel 4 (as shown in FIG. 3B ), and the pixel 1 in FIG. 3A is regarded as It is regarded as pixel 5 (as shown in FIG. 3B ); that is, through software or hardware circuit control, the pixel 2 in FIG. 3A emits light L1 (as shown in FIG. 3B ), so that the pixel in FIG. 3A emits light L1 (as shown in FIG. 3B ). 3 emit light L2 (as shown in FIG. 3B ), let the pixel 4 of FIG. 3A emit light L3 (as shown in FIG. 3B ), let the pixel 5 of FIG. 3A emit light L4 (as shown in FIG. 3B ), and let Pixel 1 of FIG. 3A emits light L5 (as shown in FIG. 3B ). In this way, the stereoscopic display 100 can be calibrated, and the user can normally see the lights L1 ˜ L5 in the visual fields V1 ˜ V5 , respectively.

The calibration system 200 of the stereoscopic display in this embodiment is used to calibrate the stereoscopic display 100 . The calibration system 200 for a stereoscopic display can be used to perform the calibration method for a stereoscopic display in FIG. 1 . The calibration system 200 for a stereoscopic display includes a controller 210 and a light intensity detector 220 . The controller 210 is used for being electrically connected to the stereoscopic display 100 and used for instructing the display 110 to light up one group of the pixels 1 to 5 arranged alternately. The light intensity detector 220 is electrically connected to the controller 210, and is used to measure the output of the group of pixels (eg, pixels 1, 2, 3, 5 or 5) in multiple viewing areas V1-V5 in space the light intensity.

The calibration system 200 of the stereoscopic display of this embodiment includes the following steps. First, step S110 is performed to provide the stereoscopic display 100 . Next, step S120 is executed to light up one group of pixels in the plurality of groups of pixels 1 to 5 , and measure the light shape distribution generated by the group of pixels passing through the image separator 120 . Specifically, the controller 210 can instruct the display 110 to light up one group of the pixels 1 to 5 arranged alternately, for example, the Nth group of pixels. In the embodiments of FIGS. 3A and 3B , N For example, less than or equal to 5. However, N can be a positive integer less than or equal to the total number of groups of pixels, and the total number of groups can be a positive integer greater than or equal to 2, and the total number of groups determines the number of viewports. In addition, when step S120 is performed for the first time, it can be performed from N=1.

Then, step S130 is performed; it is judged whether the peak of the light shape distribution falls within the preset field of view corresponding to the group of pixels. Specifically, the controller 210 instructs the light intensity detector 220 to measure the light intensity emitted by the group of pixels in a plurality of viewing areas V1-V5 in space. In addition, the controller 210 is used to determine whether the peak of the light distribution generated by the group of pixels passing through the image separator 120 falls here according to the light intensities measured by the light intensity detector 220 in these viewing areas V1 - V5 in the preset field of view corresponding to the group of pixels. For example, in another embodiment, as shown in FIG. 4A and FIG. 4B , when there are 9 groups of alternately arranged pixels, that is, pixels 1 to 9, the 9 groups of pixels 1 to 9 pass through the image separator The light shape distributions generated by 120 are shown as curves 1 to 9 in FIG. 4A, respectively. After the image separator 120 is assembled (eg, attached) to the display 110, a group of pixels (eg, pixel 1) are illuminated. The light shape distribution is shown in Figure 4B. As can be seen from FIG. 4A , when the image separator 120 is correctly attached to the display 110 , different groups of pixels 1 to 9 in the stippling will generate peaks in different viewing areas (ie, different angular ranges). It can be judged from Figure 4B that when a certain group of pixels (for example, pixel 1) are measured, it can be determined whether the peak of the obtained light shape distribution falls within the corresponding field of view (ie, a certain angle range). , it can be determined whether there is any offset when the image separator 120 is attached to the display 110 , and the stereoscopic display 100 needs to be corrected.

When the determination result of step S130 is no, step S140 is executed, and the controller 210 responds that the peak of the light shape distribution does not fall in the preset viewing area, and uses another group of pixels to correspond to the preset viewing area. As shown in FIG. 3A, when the pixel 1 is lit, it will be found that the peak of the light distribution falls on the field of view V5, but not in the field of view V1, so the pixel 2 corresponds to the field of view V1 (that is, the Pixel 2 is regarded as pixel 1 as shown in Figure 3B), pixel 3 is corresponding to the field of view V2 (that is, pixel 3 is regarded as pixel 2 in Figure 3B), and pixel 4 is corresponding to the field of view V3 (also That is to regard pixel 4 as pixel 3 as shown in Figure 3B), pixel 5 corresponds to the field of view V4 (that is, pixel 5 is regarded as pixel 4 in Figure 3B), and pixel 1 corresponds to the field of view V5. Corresponding (that is, treating pixel 1 as pixel 5 as shown in Figure 3B).

After that, go back to step S120, and light up the Nth group of pixels, and then perform the judgment of step S130.

When the determination result in step S130 is yes, the controller 210 ends the calibration or lights up another group of pixels to continue the calibration in response to the peak of the light distribution falling within the preset viewing area. Specifically, when the determination result of step S130 is yes, step S150 can be executed, which is to determine whether N is less than the total number of groups of pixels. If the judgment result of step S150 is yes, then step S160 is executed, the value of N is incremented by 1, and the process returns to step S120 to execute again. If the judgment result of step S150 is no, it means that in the execution flow, N has been executed from 1 to the total number of groups of pixels, so the calibration has been completed, so step S170 can be performed to end the calibration.

In this embodiment, the offset Δ between the corrected lenticular lens 122 and the corrected groups of pixels 1 to 5 is less than or equal to half of the width W1 of one pixel (eg, pixel 1 ).

5A is a schematic top view of the correspondence between the lenticular lens and the pixel in the stereoscopic display before calibration according to another embodiment of the present invention, and FIG. 5B is the lenticular lens and the pixel after calibration in the stereoscopic display of FIG. 5A . The top-view diagram of the corresponding relationship. Referring to FIGS. 5A and 5B , the stereoscopic display 100 a of the present embodiment is similar to the stereoscopic display 100 of FIG. 2 , and the differences between the two are as follows. In the stereoscopic display 100 a of the present embodiment, the extending direction (the first direction D1 ) of each lenticular lens 122 is neither perpendicular nor parallel to the arrangement direction of the lenticular lenses 122 (the second direction D2 , that is, the direction of the display 110 ). horizontal direction). At this time, in addition to the possibility that the lenticular lens 120 may be offset relative to the display 100 during assembly or attachment as shown in FIG. 3A , it may also generate an angular deflection as shown in FIG. 4A , that is, the average extension direction E1 of a group of pixels. Different from the first direction D1 (ie, the extending direction of each lenticular lens 122 ). At this time, the controller 210 can determine that the deflection has occurred by measuring the light shape emitted by any group of pixels 1 to 9 in multiple viewing fields in the second direction D2 by the light intensity detector 220 , and redefine the pixel grouping as shown in Figure 4B, and let the angle between the average extension direction E1' and the first direction D1 (as shown in Figure 5B) of a group of pixels lit after the redefinition (ie after correction) is smaller than that before the correction The angle θ between the average extension direction E1 and the first direction D1 of a group of lit pixels (as shown in FIG. 5A ), and in FIG. 5B , the angle between the average extension direction E1 ′ and the first direction D1 is 0 as an example (That is, the average extending direction E1' is parallel to the first direction D1). In this way, the corrected stereoscopic display 100a can display a more accurate stereoscopic image. Since the detailed extension direction of a group of pixels may be stepped or zigzag, the above-mentioned average extension directions E1 and E1' are the overall extension trend of a group of pixels, ignoring the subtle steps or zigzag changes .

In one embodiment, the controller 210 is, for example, a central processing unit (CPU), a microprocessor (microprocessor), a digital signal processor (DSP), a programmable controller, a programmable controller, or a programmable controller. A logic device (programmable logic device, PLD) or other similar devices or a combination of these devices is not limited by the present invention. Furthermore, in one embodiment, each function of the controller 210 may be implemented as a plurality of codes. These codes will be stored in a memory and executed by the controller 210 . Alternatively, in one embodiment, the functions of controller 210 may be implemented as one or more circuits. The present invention does not limit the implementation of the functions of the controller 210 by means of software or hardware.

In addition, the controller 210 instructs the display 110 to use another group of pixels to correspond to the preset viewing area. The controller 210 can rewrite the pixel grouping and corresponding data in the firmware, software or hardware in the display 110, so that the three-dimensional When the displays 100 and 100a are used after they leave the factory, they can drive the display 110 with the rewritten pixel groups and corresponding data, so as to obtain correct stereoscopic images.

To sum up, in the calibration method and calibration system of the stereoscopic display according to the embodiments of the present invention, it is determined that the group of pixels passes through the image separator according to the light intensity measured by the light intensity detector in these fields of view. Whether the peak of the light distribution of , falls within the preset field of view corresponding to this group of pixels, so the stereoscopic display can be corrected by electronic control after configuring the image splitter. In this way, the requirements on the alignment accuracy of the image separator in the process can be reduced, the process yield can be improved, and the process speed can be accelerated.

1 to 9: Pixel 100, 100a: Stereoscopic display 110: Display 120: Image Separator 122: Cylindrical lens 200: Correction System for Stereoscopic Displays 210: Controller 220: Light Intensity Detector D1: first direction D2: Second direction E1, E1': average extension direction L1, L2, L3, L4, L5: Light S110～S170: Steps V1, V2, V3, V4, V5: Viewshed W1: width Δ: offset θ: included angle

FIG. 1 is a flowchart of a method for calibrating a stereoscopic display according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a stereoscopic display according to an embodiment of the present invention when the image separator is assembled without error. FIG. 3A is a calibration system for a stereoscopic display and a stereoscopic display before calibration according to an embodiment of the present invention. FIG. 3B shows the calibration system of the stereoscopic display of FIG. 3A and the stereoscopic display after calibration. FIG. 4A is a light distribution diagram generated by 9 groups of pixels passing through an image separator. FIG. 4B is a light distribution diagram generated by the action of an image separator when a group of pixels is lit. 5A is a top-view schematic diagram illustrating the correspondence between the lenticular lenses and the pixels in the stereoscopic display before calibration according to another embodiment of the present invention. FIG. 5B is a schematic top view of the correspondence between the lenticular lenses and the pixels after the correction of the stereoscopic display of FIG. 5A .

S110~S170: Steps

Claims (10)

A method for calibrating a stereoscopic display, comprising: A stereoscopic display is provided, the stereoscopic display includes a display and an image separator disposed on the display, the display includes a plurality of groups of alternately arranged pixels; Lighting up one of the plurality of groups of pixels, and measuring the light shape distribution generated by the group of pixels through the image separator; judging whether the peak of the light shape distribution falls within the preset field of view corresponding to the group of pixels; The wave peaks reflected in the light shape distribution do not fall in the preset viewing area, but correspond to the preset viewing area with another set of pixels; and In response to the peak of the light distribution falling within the preset viewing area, the calibration is terminated or another group of pixels is lit to continue the calibration. The method for calibrating a stereoscopic display according to claim 1, wherein the image separator is a lenticular lens plate, comprising a plurality of lenticular lenses, each lenticular lens extends along a first direction, and the lenticular lenses arranged along a second direction. The method for calibrating a stereoscopic display according to claim 2, wherein the first direction is perpendicular to the second direction. The method for calibrating a stereoscopic display according to claim 2, wherein the first direction is neither perpendicular nor parallel to the second direction. The method for calibrating a stereoscopic display according to claim 4, wherein the average extension direction of the group of pixels is different from the first direction, and the angle between the average extension direction of the other group of pixels and the first direction is smaller than that of the group of pixels The included angle between the average extension direction of the pixels and the first direction. A calibration system for a stereoscopic display is used to calibrate a stereoscopic display. The stereoscopic display includes a display and an image separator disposed on the display. The calibration system for the stereoscopic display includes: a controller, electrically connected to the stereoscopic display, and used to instruct the display to light up one of a plurality of alternately arranged pixels; and a light intensity detector, electrically connected to the controller, and used for measuring the light intensity emitted by the group of pixels in a plurality of viewing fields in space, Wherein, the controller is used for judging whether the peak of the light distribution generated by the group of pixels through the image splitter falls on the group of pixels according to the light intensity measured by the light intensity detector in the fields of view In the corresponding preset field of view, the controller is used for instructing the display to correspond to the preset field of view with another group of pixels in response to that the peak of the light shape distribution does not fall in the preset field of view, and The controller is used for finishing the calibration or lighting another group of pixels to continue the calibration in response to the peak of the light distribution falling within the preset viewing area. The correction system for a stereoscopic display according to claim 6, wherein the image separator is a lenticular lens plate, comprising a plurality of lenticular lenses, each lenticular lens extends along a first direction, and the lenticular lenses arranged along a second direction. The correction system for a stereoscopic display according to claim 7, wherein the first direction is perpendicular to the second direction. The correction system for a stereoscopic display according to claim 7, wherein the first direction is neither perpendicular nor parallel to the second direction. The correction system for a stereoscopic display according to claim 9, wherein the average extension direction of the group of pixels is different from the first direction, and the angle between the average extension direction of the other group of pixels and the first direction is smaller than that of the group of pixels The included angle between the average extension direction of the pixels and the first direction.

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