Projection system and projection method

Abstract

The invention discloses a projection system and a projection method, and the projection system comprises a reflective display panel which is configured to display a first image; the projector is configured to synchronously project a second image which is the same as the first image to the reflective display panel, so that the first image and the second image coincide; the at least two light sensor groups are respectively arranged at two opposite corners of the reflective display panel, and the light sensor groups are configured to sense the boundary of a second image projected by the projector so as to generate corresponding sensing signals; wherein the projector adjusts the projection of the second image according to the sensing signal so as to correct the coincidence degree of the second image and the first image. By using the reflective display panel as the projection screen, not only are the color saturation and contrast of the image improved, but also the energy consumption for displaying the static picture in the bright environment is low, and the availability of the projection system in the bright environment is increased.

Description

Technical Field

[0001] This invention belongs to the field of display devices, and relates to a projection system and projection method. Background Technology

[0002] A projector is an optical device that projects images onto a flat surface (such as a wall or screen) for display.

[0003] However, the method of projecting images onto a single-color (usually white) screen to form an image has technical problems, such as the reflected light from the screen making the dark areas not dark enough, the dark areas appearing as blurry, and the image being prone to color inaccuracy, dispersion, insufficient brightness and contrast, resulting in a poor viewing experience. Summary of the Invention

[0004] The purpose of this invention is to provide a projection system and projection method that can solve the technical problems such as color inaccuracy, dispersion, insufficient brightness and contrast faced by existing projectors in projecting images onto a single-color screen.

[0005] To achieve the above objectives, the present invention provides a projection system comprising: a reflective display panel configured to display a first image; a projector configured to synchronously project a second image identical to the first image onto the reflective display panel, such that the first image and the second image overlap; and at least two light sensor groups respectively disposed at two opposite corners of the reflective display panel, the light sensor groups being configured to sense the boundary of the second image projected by the projector to generate a corresponding sensing signal; wherein the projector adjusts its projection onto the second image based on the sensing signal to correct the degree of overlap between the second image and the first image.

[0006] In one embodiment, each light sensor group includes an inner sensor and an outer sensor arranged side by side, the inner sensor and the outer sensor being respectively located on the inner and outer sides of the edge of the display area of ​​the reflective display panel.

[0007] In one embodiment, the projection system further includes a central light sensor located at the center of the display area of ​​the reflective display panel; the projector completes calibration when the brightness sensed by each inner sensor and the central light sensor is higher than a first threshold value, and the brightness sensed by each outer sensor is lower than a second threshold value.

[0008] In one embodiment, the projection system includes four light sensor groups, each located at one of the four corners of the reflective display panel.

[0009] In one implementation, the reflective display panel, the projector, and at least two light sensor groups are interconnected via wired or wireless means.

[0010] To address the aforementioned technical problems, the present invention also provides a projection method, executed by the projection system described above, the projection method comprising the following steps:

[0011] In a display projection step, an image signal is provided to a reflective display panel and a projector, so that the reflective display panel displays a first image, and the projector synchronously projects a second image identical to the first image onto the reflective display panel, so that the first image and the second image overlap.

[0012] A sensing step involves sensing the boundary of the second image projected by the projector using at least two sets of optical sensors to generate a corresponding sensing signal.

[0013] In the first calibration step, the projector adjusts the projection of the second image based on the sensor signal to correct the degree of overlap between the second image and the first image.

[0014] In one embodiment, each light sensor group includes an inner sensor and an outer sensor arranged side by side. The inner sensor and the outer sensor are respectively located on the inner and outer sides of the display area edge of the reflective display panel. In the calibration step, the position of the projector projecting the second image onto the reflective display panel is adjusted so that in each light sensor group, the brightness sensed by the inner sensor is higher than a first threshold value, and the brightness sensed by the outer sensor is lower than a second threshold value, so as to correct the degree of overlap between the second image and the first image.

[0015] In one embodiment, after the correction step, a trapezoidal correction step is further included to perform trapezoidal correction on the second image, such that the difference between the brightness sensed by each inner sensor and the first threshold value is less than a first preset value, and the difference between the brightness sensed by each outer sensor and the second threshold value is less than a second preset value.

[0016] In one embodiment, the display projection step further includes a resolution adjustment step to make the resolution of the first image displayed by the reflective display panel the same as the resolution of the second image projected by the projector.

[0017] In one implementation, the image signal is provided by an external computer device or an internal processor of a reflective display panel.

[0018] The beneficial effects of this invention are as follows: The projection system of this invention, by using a reflective display panel as the projection screen, not only improves the color saturation and contrast of the image, but also consumes less energy for static images in bright environments, thus increasing its usability in bright environments. Furthermore, in the projection method of this invention, by ensuring that the image displayed on the reflective display panel (first image) and the image projected by the projector (second image) have the same resolution, and by performing keystone correction on the two images, the degree of overlap is improved, thereby obtaining a clearer and brighter image. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a projection system according to an embodiment of the present invention.

[0020] Figure 2 This is a schematic diagram of the configuration of the light sensor in a projection system according to an embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram showing the configuration of another light sensor in a projection system according to an embodiment of the present invention.

[0022] Figure 4 This is a flowchart of a projection method according to an embodiment of the present invention. Detailed Implementation

[0023] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and not for limiting the scope of the invention. The following descriptions of the embodiments are with reference to the accompanying drawings, which illustrate specific examples in which the invention can be implemented. Furthermore, directional terms used in the present invention, such as up, down, top, bottom, front, back, left, right, inside, outside, side, surrounding, center, horizontal, transverse, vertical, longitudinal, axial, radial, uppermost, or lowermost, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative and understanding purposes, and not for limiting the invention. It should be noted that the accompanying drawings are simplified schematic diagrams; therefore, only elements and combinations related to the present invention are shown to provide a clearer description of the basic structure or implementation method of the invention, while the actual elements and layout may be more complex. In addition, for ease of explanation, the elements shown in the various drawings of the present invention are not drawn to scale according to the actual number, shape, and size; the detailed scale can be adjusted according to design requirements.

[0024] Reference Figure 1 and Figure 2 In a first embodiment, the present invention provides a projection system 100, which mainly includes a reflective display panel 1, a projector 2, and at least two light sensor groups 3.

[0025] In this embodiment, the reflective display panel 1, the projector 2, and at least two light sensor groups 3 can be interconnected via wired or wireless means, such as a Universal Serial Bus (USB) port, WiFi, or Bluetooth.

[0026] The reflective display panel 1 may be, for example, a reflective liquid crystal display panel, and has a display area A configured to display a first image I1, wherein the first image I1 may be a static or dynamic image. Specifically, the display area A of the reflective display panel 1 is formed by a plurality of pixel units, each pixel unit including at least a red sub-pixel, a green sub-pixel, and a blue sub-pixel corresponding to the RGB primary colors. These sub-pixels can be used for color image display through additive color mixing, i.e., displaying the first image I1.

[0027] Reference Figure 1 Projector 2 is configured to synchronously project a second image I2, identical to the first image I1, onto the display surface of reflective display panel 1, so that the first image I1 and the second image I2 coincide. Specifically, projector 2 includes a light source to generate a light beam (not shown). The light beam is separated into red, green, and blue light by a dichroic mirror, filter, or color wheel inside projector 2. The display panel inside projector 2 then adjusts the red, green, and blue light. Finally, the light is transmitted to a projection lens L via transmission or reflection, converted into an image beam IM, and projected onto reflective display panel 1 to generate the second image I2, which can be a static or dynamic image. To enhance color saturation, the red light IMR of image beam IM is projected onto the red display area I1R of the first image I1, the green light IMG of image beam IM is projected onto the green display area I1G of the first image I1, and the blue light IMB of image beam IM is projected onto the blue display area I1B of the first image I1. In addition, to enhance contrast, the image beam IM does not project a beam onto the black area I1N of the first image I1, thus keeping the black area I1N dark.

[0028] At least two light sensor groups 3 are respectively disposed at two opposite corners of the reflective display panel 1. The light sensor groups 3 are configured to sense the boundary of the second image I2 projected by the projector 2 to generate corresponding sensing signals. The projector 2 adjusts the projection of the second image I2 according to the sensing signals to correct the degree of overlap between the second image I2 and the first image I1. Each light sensor group 3 can be an amorphous silicon thin-film transistor (TFT) light sensor or other sensor capable of sensing light changes, used to detect the ambient light brightness around the reflective display panel 1. For details, refer to... Figure 2In this embodiment, four light sensor groups 3 are included, respectively located at the four corners of the reflective display panel 1. Each light sensor group 3 includes an inner sensor 31 and an outer sensor 32 arranged side by side. The inner sensor 31 and outer sensor 32 of each light sensor group 3 are respectively located on the inner and outer sides of the edge of the display area A of the reflective display panel 1. When the brightness sensed by each inner sensor 31 is higher than a first threshold value, and the brightness sensed by each outer sensor 32 is lower than a second threshold value, the projector completes the calibration. In this embodiment, the first threshold value is greater than the second threshold value. The higher the difference between the two threshold values, the greater the required difference in brightness sensed on both sides of the edge of the display area A, thus more accurately measuring the projection range of the projector 2. In other words, when the inner side of the four corners of the display area A of the reflective display panel 1 is sensed to be the brightest, and the outer side of the four corners of the display area A of the reflective display panel 1 is sensed to be the darkest, the optimal alignment position is reached, and the overlap calibration of the second image I2 and the first image I1 is completed. Therefore, for accurate alignment, the projector 2 can be set to project a single white image with the highest brightness during calibration, which facilitates image overlap calibration. Alternatively, depending on various considerations, such as alignment accuracy requirements and cost, other implementations may include only two light sensor groups 3, positioned at opposite corners of the reflective display panel 1, such as the upper left and lower right corners.

[0029] To further improve calibration accuracy, in addition to placing light sensor groups at the corners of the reflective display panel, a light sensor can also be placed at the center of the reflective display panel 1. (Refer to...) Figure 3 The diagram illustrates a projection system according to a second embodiment, which is largely the same as the projection system of the first embodiment described above, except that the projection system further includes a central light sensor 3', located at the center of the display area A of the reflective display panel 1A. The projector completes calibration when the brightness sensed by each inner sensor 31 and the central light sensor 3' is higher than a first threshold value, and the brightness sensed by each outer sensor 32 is lower than a second threshold value. In this embodiment, both the central light sensor 3' and the inner sensors 31 use the first threshold value as the calibration standard. However, this invention is not limited to this. In other embodiments, depending on the projector placement requirements or the difference in uniformity of the projected beam between the center and the periphery, the central light sensor 3' may use a third threshold value, different from the first and second threshold values, as the calibration standard, and the third threshold value is greater than the first threshold value. In this embodiment, the projector completes calibration when the brightness sensed by each inner sensor 31 is higher than the first threshold value, the brightness sensed by the central light sensor 3' is higher than the third threshold value, and the brightness sensed by each outer sensor 32 is lower than the second threshold value.

[0030] Reference Figure 4 The present invention also provides a projection method, which is executed by the projection system 100 described above. The projection method mainly includes a display projection step S1, a sensing step S2 and a correction step S3.

[0031] Please refer to the following at the same time Figure 1 and Figure 2 First, in the display projection step S1, an image signal is provided to the reflective display panel 1 and the projector 2, causing the reflective display panel 1 to display a first image I1, and the projector 2 to synchronously project a second image I2, identical to the first image I1, onto the reflective display panel 1, so that the first image I1 and the second image I2 coincide. Optionally, the image signal can be provided by an external computer device or an internal processor of the reflective display panel 1. To further improve the image clarity, the display projection step may also include a resolution adjustment step S11, so that the resolution of the first image I1 displayed by the reflective display panel 1 is the same as the resolution of the second image I2 projected by the projector 2.

[0032] Next, in sensing step S2, the projection system 100 senses the boundary of the second image I2 projected by the projector 2 through the inner sensor 31 and outer sensor 32 of each light sensor group 3 to generate a corresponding sensing signal. Specifically, as described in the aforementioned embodiment of the projection system 100, each light sensor group 3 includes an inner sensor 31 and an outer sensor 32 arranged side by side, with the inner sensor 31 and outer sensor 32 respectively located on the inner and outer sides of the edge of the display area A of the reflective display panel 1.

[0033] Finally, in the calibration step S3, the projector 2 adjusts the projection of the second image I2 according to the sensor signals to correct the degree of overlap between the second image I2 and the first image I1. Specifically, as described above, the position of the projector 2 projecting the second image I2 onto the reflective display panel 1 is adjusted so that the brightness sensed by each inner sensor 31 is higher than a first threshold value, and the brightness sensed by each outer sensor 32 is lower than a second threshold value, thereby correcting the degree of overlap between the second image I2 and the first image I1.

[0034] Optionally, in order to make the sensing differences in each corner of the reflective display panel 1 as consistent as possible, the overall brightness is consistent, and the alignment is more accurate, a trapezoidal correction step S4 is included after the correction step to perform trapezoidal correction on the second image I2, so that the difference between the brightness sensed by each inner sensor 31 and the first threshold value is less than a first preset value, and the difference between the brightness sensed by each outer sensor 32 and the second threshold value is less than a second preset value.

[0035] In summary, the projection system of the present invention, by using a reflective display panel as the projection screen, not only improves the color saturation and contrast of the image, but also consumes less energy for static images in bright environments, thereby increasing the availability of ambient light. Furthermore, in the projection method of the present invention, by ensuring that the image displayed on the reflective display panel (the first image) and the image projected by the projector (the second image) have the same resolution, and by performing keystone correction on the two images, the degree of overlap is improved, resulting in a clearer and brighter image.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A projection system, characterized in that, Include: A reflective display panel configured to display a first image; A projector is configured to synchronously project a second image identical to the first image onto the reflective display panel, so that the first image and the second image overlap. as well as At least two light sensor groups are respectively disposed at two opposite corners of the reflective display panel. The light sensor groups are configured to sense the boundary of the second image projected by the projector to generate corresponding sensing signals. The projector adjusts the projection of the second image according to the sensing signal to correct the degree of overlap between the second image and the first image.

2. The projection system as described in claim 1, characterized in that: Each of the light sensor groups includes an inner sensor and an outer sensor arranged side by side, the inner sensor and the outer sensor being respectively located on the inner and outer sides of the edge of the display area of ​​the reflective display panel.

3. The projection system as described in claim 2, characterized in that: The projection system also includes a central light sensor, which is located at the center of the display area of ​​the reflective display panel; when the brightness sensed by each of the inner sensors and the central light sensor is higher than a first threshold value, and the brightness sensed by each of the outer sensors is lower than a second threshold value, the projector completes the calibration.

4. The projection system as described in claim 1, characterized in that: The projection system includes four light sensor groups, which are respectively located at the four corners of the reflective display panel.

5. The projection system as described in claim 1, characterized in that: The reflective display panel, the projector, and the at least two light sensor groups are interconnected via wired or wireless means.

6. A projection method, performed by the projection system as described in claim 1, characterized in that, The projection method includes the following steps: A display projection step involves providing an image signal to the reflective display panel and the projector, causing the reflective display panel to display the first image, and causing the projector to synchronously project a second image identical to the first image onto the reflective display panel, so that the first image and the second image overlap. A sensing step involves sensing the boundary of the second image projected by the projector using the at least two sets of optical sensors to generate a corresponding sensing signal; and In a calibration step, the projector adjusts the projection of the second image according to the sensing signal to correct the degree of overlap between the second image and the first image.

7. The projection method as described in claim 6, characterized in that: Each of the light sensor groups includes an inner sensor and an outer sensor arranged side by side. The inner sensor and the outer sensor are respectively located on the inner and outer sides of the display area edge of the reflective display panel. In the calibration step, the position of the projector projecting the second image onto the reflective display panel is adjusted so that in each of the light sensor groups, the brightness sensed by the inner sensor is higher than a first threshold value, and the brightness sensed by the outer sensor is lower than a second threshold value, so as to correct the degree of overlap between the second image and the first image.

8. The projection method as described in claim 7, characterized in that: Following the correction step, a trapezoidal correction step is further included to perform trapezoidal correction on the second image, such that the difference between the brightness sensed by each of the inner sensors and the first threshold value is less than a first preset value, and the difference between the brightness sensed by each of the outer sensors and the second threshold value is less than a second preset value.

9. The projection method as described in claim 6, characterized in that: The display projection step further includes a resolution adjustment step, so that the resolution of the first image displayed by the reflective display panel is the same as the resolution of the second image projected by the projector.

10. The projection method as described in claim 6, characterized in that: The image signal is provided by an external computer device or an internal processor of the reflective display panel.

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