Stereoscopic display system and its control method

Abstract

This invention provides a stereoscopic display system and its control method. A rotating element is controlled to rotate at 2n times the frequency of the input image, causing the rotating element to rotate n revolutions during the period when the stereoscopic glasses receive the left-eye image and during the period when they receive the right-eye image. Using the stereoscopic display system and its control method of this invention, the display quality of stereoscopic images can be effectively improved.

Description

Technical Field

[0001] This invention relates to a display device, and more particularly to a control method for a stereoscopic display system. Background Technology

[0002] With advancements in display technology, monitors supporting 3D stereoscopic image playback have become increasingly common. The difference between 3D displays and conventional 2D projection lies in the fact that 3D technology allows viewers to experience a sense of depth in the image, such as three-dimensional facial features and depth of field, effects that 2D images cannot replicate. The principle behind 3D display technology is to allow the viewer's left eye to see the left-eye image and their right eye to see the right-eye image, thus creating a 3D visual effect. While traditional 3D display technology can effectively present a stereoscopic effect, there is still room for improvement in display quality. For example, color distortion can be observed when the viewer's eyes move; for instance, when the displayed image is white, the viewer may see red, green, and blue instead of the combined white, thus affecting the image quality. Summary of the Invention

[0003] This invention provides a control method for a stereoscopic display system, which can effectively improve the display quality of stereoscopic images.

[0004] The stereoscopic display system of the present invention includes stereoscopic glasses and a projection device. The projection device receives an input image signal and outputs the input image signal, including a left-eye image and a right-eye image, to the stereoscopic glasses. The input image signal has an input image frequency. The projection device includes a rotating element and a control circuit. The rotating element is disposed in the transmission path of the light beam and converts the light beam into colored light. The control circuit is coupled to the rotating element and controls the rotating element to rotate at 2n times the input image frequency, such that the rotating element rotates n revolutions during the period when the stereoscopic glasses receive the left-eye image and during the period when they receive the right-eye image, respectively, where n is an integer greater than 1.

[0005] This invention also provides a control method for a stereoscopic display system. The stereoscopic display system includes stereoscopic glasses and a projection device, the projection device including a rotating element and a control circuit. The display method of the stereoscopic display system includes the following steps: receiving an input image signal through the projection device and outputting the input image signal including a left-eye image and a right-eye image, the input image signal having an input image frequency; controlling the rotating element to rotate at 2n times the input image frequency through the control circuit, such that the rotating element rotates n revolutions during the period when the stereoscopic glasses receive the left-eye image and during the period when they receive the right-eye image, where n is an integer greater than 1.

[0006] Based on the above, the control circuit of this embodiment can control the rotating element to rotate at 2n times the input image frequency, causing the rotating element to rotate n revolutions during the period when the stereoscopic glasses receive the left-eye image and during the period when they receive the right-eye image, where n is an integer greater than 1. By increasing the number of rotations of the rotating element during the provision of the left-eye and right-eye images, the color change frequency of the images received by the left and right eyes can be increased, effectively preventing color distortion without affecting the brightness of the image, thereby effectively improving the display quality of the stereoscopic image.

[0007] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a stereoscopic display system according to an embodiment of the present invention.

[0009] Figure 2 This is a schematic diagram of a driving stereoscopic glasses and a rotating element according to an embodiment of the present invention.

[0010] Figure 3 This is a schematic diagram of a driving stereoscopic glasses and a rotating element according to another embodiment of the present invention.

[0011] Figure 4 This is a flowchart of a control method for a stereoscopic display system according to an embodiment of the present invention. Detailed Implementation

[0012] To make the content of this invention more readily apparent, the following specific embodiments are provided as examples on which this invention can indeed be implemented. Furthermore, wherever possible, components / members referred to by the same reference numerals in the drawings and embodiments represent the same or similar parts.

[0013] Figure 1 This is a schematic diagram of a stereoscopic display system according to an embodiment of the present invention. Please refer to... Figure 1The stereoscopic display system may include stereoscopic glasses 102 and a projection device 104. The stereoscopic glasses 102 may be active stereoscopic glasses, such as shutter-type stereoscopic glasses, but are not limited thereto. The projection device 104 may receive an input image signal S1, which is a 3D image signal including a left-eye image IL and a right-eye image IR. The projection device 104 outputs the left-eye image IL and the right-eye image IR to the stereoscopic glasses 102. The input image frequency (i.e., the frame refresh rate) of the input image signal S1 may be, for example, 24Hz, 48Hz, 60Hz, 96Hz, 120Hz, or 144Hz, but is not limited thereto. For example, if the input image frequency of the input image signal S1 is 60Hz, then the frame refresh rate of the left-eye image IL and the right-eye image IR is 120Hz.

[0014] Furthermore, the projection device 104 may include a rotating element 106, a control circuit 108, and a conversion signal generator 110. The control circuit 108 is coupled to the rotating element 106 and the conversion signal generator 110. The rotating element 106 is disposed on the transmission path of the light beam L1 to convert the light beam L1 into colored light L2. The control circuit 108 includes a controllable switching electronic switch (not shown) that, in conjunction with the rotation of the rotating element 106, enables the projection device 104 to provide a left-eye image IL and a right-eye image IR. The rotating element 106 may be implemented, for example, as a color wheel or a phosphor wheel.

[0015] The control circuit 108 can control the rotation speed of the rotating element 106 according to the frame update rate of the input image signal S1. For example, it can control the rotating element 106 to rotate at 2n times the input image frequency, so that the rotating element 106 rotates n times during the period when the stereoscopic glasses 102 receive the left eye image IL and the period when it receives the right eye image IR, where n is an integer greater than 1. When the rotating element rotates n times, the control circuit 108 can control the conversion signal generator 110 to output the left-right eye conversion signal SW1 during the conversion signal output period, so that the stereoscopic glasses 102 changes from blocking one of the left eye image IL and the right eye image IR to blocking the other according to the left-right eye conversion signal SW1, that is, the stereoscopic glasses 102 changes from receiving one of the right eye image IR and the left eye image IL to receiving the other.

[0016] For example, Figure 2 This is a schematic diagram of a driving stereoscopic glasses and a rotating element according to an embodiment of the present invention. Figure 2As shown, the stereoscopic glasses 102 are controlled by conversion control signals SL and SR to block the left-eye image IL or the right-eye image IR. When the conversion control signal SL is at a high logic level and the conversion control signal SR is at a low logic level, the left-eye image IL can pass through the stereoscopic glasses 102, and the right-eye image IR is blocked by the stereoscopic glasses 102. When the conversion control signal SL is at a low logic level and the conversion control signal SR is at a high logic level, the right-eye image IR can pass through the stereoscopic glasses 102, and the left-eye image IL is blocked by the stereoscopic glasses 102. The logic level changes of the conversion control signals SL and SR are controlled by the left-right eye conversion signal SW1. Taking the period TR during which the projection device 104 provides the right-eye image IR as an example, the period TR during which the projection device 104 provides the right-eye image IR may include a conversion signal output period T1 and an image reception period T2. During the conversion signal output period T1, the stereoscopic glasses 102 are controlled by the conversion control signals SL and SR to switch between blocking the left and right eye images. After the stereoscopic glasses 102 completes the switching of the left and right eye images, during the image reception period T2, the stereoscopic glasses 102 receives the right eye image IR and blocks the left eye image IL.

[0017] In this embodiment, the rotating element 106 includes light conversion regions R, Y, B, and G, whose colors are red, yellow, blue, and green in sequence. The input image frequency of the input image signal S1 is 60Hz, meaning that the frame update frequency of the left-eye image IL and the right-eye image IR is 120Hz, and the display time of each frame of the left-eye image IL and the right-eye image IR is 8.33ms. The control circuit 108 can, for example, control a 240Hz (n equals 2) motor to drive the rotating element 106 so that the rotating element 106 can rotate 2 revolutions every 8.33ms. That is, the rotating element 106 rotates 2 revolutions during the period when the projection device 104 provides the left-eye image IL and the right-eye image IR, so as to cyclically provide the colored light L2 of the colors of the light conversion regions R, Y, B, and G twice. Taking the period TR during which the projection device 104 provides the right-eye image IR as an example, during the period TR, the rotating element 106 can sequentially provide the colored light L2 of red, yellow, blue, green, red, yellow, blue, and green. Similarly, when the projection device 104 provides the left eye image IR, the implementation details of the stereoscopic glasses 102 and the projection device 104 are similar, and will not be repeated here.

[0018] By increasing the number of rotations of the rotating element 106 during the reception of the left-eye image IL and the right-eye image IR, for example, in the above embodiment, the rotating element 106 is controlled to rotate at 4 times the input image frequency, so that the rotating element 106 rotates 2 times during the reception of the left-eye image IL and the right-eye image IR of the stereoscopic glasses 102, the color change frequency of the images received by the viewer's left and right eyes can be increased, which can effectively avoid the occurrence of color distortion and will not affect the brightness of the image, thereby effectively improving the display quality of the stereoscopic image.

[0019] It is worth noting that the above embodiment describes a stereoscopic display system with n equal to 2. However, in other embodiments, n can be any value greater than 1, and is not limited to the above embodiment. Furthermore, in the above embodiment, during the conversion signal output period T1, the rotating element 106 illuminates the boundary between any two colors in the light conversion region. This reduces the occlusion effect on the light beam L1 when switching between left and right eye images during the conversion signal output period T1, resulting in more uniform color. However, in other embodiments, the rotating element 106 can also illuminate any one light conversion region during the conversion signal output period T1. Furthermore, the above embodiment is described using the rotating element 106 as an example with four color light conversion regions, but it is not limited to this. In other embodiments, the rotating element 106 can also include light conversion regions with fewer colors (e.g., red, green, blue) or more colors.

[0020] Furthermore, in some embodiments, the control circuit 108 can control the rotational speed of the rotating element 106 according to a preset frame refresh rate, which may be, for example, 60Hz, 96Hz, 120Hz, or 144Hz, but is not limited thereto. When the frame refresh rate of the input image signal S1 is not equal to the preset frame refresh rate, the control circuit 108 can convert the frame refresh rate of the input image signal S1 to the preset frame refresh rate, and then control the rotational speed of the rotating element 106 according to the preset frame refresh rate.

[0021] Furthermore, the above embodiments describe the case where the stereoscopic glasses 102 are active stereoscopic glasses. However, in some embodiments, the stereoscopic glasses 102 may also be passive stereoscopic glasses, such as passively polarized stereoscopic glasses, but this is not a limitation. In the case where the stereoscopic glasses 102 are implemented as passively polarized stereoscopic glasses, the projection device 104 may not include the conversion signal generator 110. The projection device 104 can provide left-eye and right-eye images with different polarization states to achieve the effect of the stereoscopic glasses 102 blocking the left-eye or right-eye image. The conversion signal output period T1 can be the period during which the projection device 104 changes the polarization state of the provided image. Since the implementation method of the stereoscopic display system using passively polarized stereoscopic glasses to implement the stereoscopic glasses 102 is similar to the above embodiments, it will not be described again here.

[0022] Figure 4This is a flowchart of a control method for a stereoscopic display system according to an embodiment of the present invention. The stereoscopic display system includes stereoscopic glasses and a projection device. The projection device includes a rotating element and a control circuit. The stereoscopic glasses can be active or passive stereoscopic glasses. The rotating element can include multiple light conversion areas of different colors, such as red, green, blue, and yellow light conversion areas, but is not limited thereto. The rotating element can be implemented, for example, as a color wheel or a phosphor wheel. As can be seen from the above embodiment, the control method of the stereoscopic display system can include at least the following steps. First, through the projection device, an input image signal is received, and the input image signal including a left-eye image and a right-eye image is output, wherein the input image signal has an input image frequency (step S402). The input image frequency of the input image signal can be the screen refresh rate of the input image signal. Next, through the control circuit, the rotating element is controlled to rotate at 2n times the input image frequency, so that the rotating element rotates n times during the period when the stereoscopic glasses receive the left-eye image and during the period when they receive the right-eye image, respectively, where n is an integer greater than 1 (step S404). Furthermore, every n revolutions of the rotating element, a left-right eye conversion signal can be output, causing the stereoscopic glasses to switch from blocking one of the left-eye and right-eye images to blocking the other, based on the conversion signal. During the conversion signal output, the light beam illuminates the boundary between any two colors in the light conversion area; in other embodiments, it can illuminate either light conversion area. In some embodiments, the rotation speed of the rotating element can be controlled according to a preset screen refresh rate. When the screen refresh rate of the input image signal is not equal to the preset screen refresh rate, the screen refresh rate of the input image signal can be converted to the preset screen refresh rate, and then the rotation speed of the rotating element can be controlled according to the preset screen refresh rate. The preset screen refresh rate can be, for example, 60Hz, but is not limited to this.

[0023] In summary, the control circuit of this embodiment can control the rotating element to rotate at 2n times the frequency of the input image, causing the rotating element to rotate n revolutions during the period when the stereoscopic glasses receive the left-eye image and the period when they receive the right-eye image, where n is an integer greater than 1. By increasing the number of rotations of the rotating element during the provision of the left-eye and right-eye images, the color change frequency of the images received by the left and right eyes can be increased, effectively preventing color distortion without affecting the brightness of the image, thereby effectively improving the display quality of the stereoscopic image.

[0024] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A stereoscopic display system, characterized in that, include: 3D glasses; as well as A projection device is used to receive an input image signal and output the input image signal, including a left-eye image and a right-eye image, to the stereoscopic glasses. The input image signal has an input image frequency. The projection device includes: A rotating element, positioned along the path of the light beam, converts the light beam into colored light; as well as A control circuit, coupled to the rotating element, controls the rotating element to rotate at 2n times the frequency of the input image, such that the rotating element rotates n revolutions during the period when the stereoscopic glasses receive the left-eye image and during the period when they receive the right-eye image, where n is an integer greater than 1. When the input image frequency of the input image signal is not equal to the preset frequency, the control circuit converts the input image frequency of the input image signal into the preset frequency and controls the rotating element to rotate at 2n times the preset frequency.

2. The stereoscopic display system according to claim 1, characterized in that, When the rotating element rotates n times, the control circuit outputs a left-right eye switching signal, and the stereoscopic glasses switch from blocking one of the left-eye image and the right-eye image to blocking the other according to the left-right eye switching signal.

3. The stereoscopic display system according to claim 2, characterized in that, The projection device includes: A conversion signal generator is coupled to the control circuit, which controls the conversion signal generator to generate the left-right eye conversion signal during the conversion signal output period.

4. The stereoscopic display system according to claim 3, characterized in that, The rotating element includes multiple light conversion regions of different colors. During the conversion signal output, the rotating element converts the light beam into two different colors of light or converts the light beam into the same color of light.

5. The stereoscopic display system according to claim 3, characterized in that, The rotating element includes red, green, blue, and yellow light conversion regions, and during the conversion signal output, the light beam illuminates the boundary between any two colors in the light conversion regions.

6. The stereoscopic display system according to claim 1, characterized in that, The preset frequency is 60Hz, 96Hz, 120Hz or 144Hz.

7. The stereoscopic display system according to claim 1, characterized in that, The stereoscopic glasses are either active or passive stereoscopic glasses.

8. A control method for a stereoscopic display system, the stereoscopic display system comprising stereoscopic glasses and a projection device, the projection device comprising a rotating element and a control circuit, characterized in that, The display method of the stereoscopic display system includes: The projection device receives input image signals and outputs the input image signals, including left-eye and right-eye images, wherein the input image signals have an input image frequency; and The control circuit controls the rotating element to rotate at 2n times the frequency of the input image, causing the rotating element to rotate n revolutions during the period when the stereoscopic glasses receive the left-eye image and during the period when they receive the right-eye image, where n is an integer greater than 1. When the input image frequency of the input image signal is not equal to the preset frequency, the input image frequency of the input image signal is converted to the preset frequency; and The rotating element is controlled to rotate at 2n times the preset frequency according to the preset frequency.

9. The control method for the stereoscopic display system according to claim 8, characterized in that, include: When the rotating element rotates n times, the control circuit outputs a left-right eye switching signal, and the stereoscopic glasses switch from blocking one of the left-eye image and the right-eye image to blocking the other according to the left-right eye switching signal.

10. The control method for the stereoscopic display system according to claim 9, characterized in that, The rotating element includes multiple light conversion regions of different colors, and during the output of the conversion signal, the light beam illuminates the boundary between any two colors in the light conversion regions.

11. The control method for the stereoscopic display system according to claim 9, characterized in that, The rotating element includes red, green, blue, and yellow light conversion regions, and during the conversion signal output, the rotating element converts the light beam into red and green light.

12. The control method for the stereoscopic display system according to claim 9, characterized in that, The preset frequency is 60Hz, 96Hz, 120Hz or 144Hz.

13. The control method for the stereoscopic display system according to claim 9, characterized in that, The stereoscopic glasses are either active or passive stereoscopic glasses.

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