CN111752517B - Method, terminal and computer readable storage medium capable of projecting screen to far-end display screen - Google Patents
Method, terminal and computer readable storage medium capable of projecting screen to far-end display screen Download PDFInfo
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- CN111752517B CN111752517B CN202010526257.6A CN202010526257A CN111752517B CN 111752517 B CN111752517 B CN 111752517B CN 202010526257 A CN202010526257 A CN 202010526257A CN 111752517 B CN111752517 B CN 111752517B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1454—Digital output to display device ; Cooperation and interconnection of the display device with other functional units involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/4104—Peripherals receiving signals from specially adapted client devices
- H04N21/4122—Peripherals receiving signals from specially adapted client devices additional display device, e.g. video projector
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
- H04N21/42653—Internal components of the client ; Characteristics thereof for processing graphics
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/47—End-user applications
- H04N21/485—End-user interface for client configuration
- H04N21/4854—End-user interface for client configuration for modifying image parameters, e.g. image brightness, contrast
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- Human Computer Interaction (AREA)
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- General Physics & Mathematics (AREA)
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
The invention discloses a method capable of projecting a screen to a remote display screen, a reading terminal and a computer readable storage medium, comprising the following steps: the processor is used for carrying out gray level calculation on the image to be projected to convert the image into a gray level image; the memory is used for storing the gray level image and the lookup table; the time sequence controller is used for searching the lookup table according to the temperature of the ink screen and outputting the driving waveform parameters of the gray level image; the communication interface transmits the driving waveform parameters to the remote display screen. The reading terminal provides driving waveform parameters of the gray level image for the far-end display device so as to reduce the time of gray level processing, and the display picture of the reading terminal and the display picture of the far-end display device are synchronous.
Description
Technical Field
The present invention relates generally to the field of displays. More particularly, the invention relates to a method for projecting a page of a reading terminal to a remote display screen for display, the reading terminal and a computer readable storage medium.
Background
The reading terminal is an electronic reader with a display screen adopting electronic paper technology, and provides paper-like reading experience. Compared to conventional displays (e.g., LCD or LED), the technology of electronic paper can make eyes feel no tiredness after long-time reading. Furthermore, with the development of the internet, the reading terminal may download the electronic books, and have a memory with a large capacity to store the electronic books. The reading terminal has the characteristics of portability, easy use, no eye injury and large capacity, and is very suitable for modern life.
For portability, the display screen of the reading terminal is not too large, however in some use environments, such as at home, a large display device is provided. The reading terminal can be connected to other display devices in a wired or wireless mode to remotely and synchronously throw the content in the display screen. The existing screen-throwing display process is that a reading terminal converts a color image to be displayed into a gray image, the gray image is transmitted to a time sequence controller for driving and displaying, and meanwhile, a system interface is called to capture the color image to be displayed and the color image is transmitted to a far-end display device. And after receiving the screenshot, the remote display device drives and displays the color image.
However, in the transmission process, the image acquired by the far-end display device is a color image which is not subjected to gray processing, so that the far-end display device also needs to perform gray processing operation to display, and a certain time delay is caused in the process. Especially when the synchronization process also involves handwriting operations, the delay is more severe and the user experience is poor.
Disclosure of Invention
In order to at least partially solve the technical problems mentioned in the background art, the invention provides a method for projecting a screen to a remote display screen, a reading terminal and a computer readable storage medium.
In one aspect, the present invention discloses a reading terminal capable of projecting a screen to a remote display screen, comprising: the device comprises an ink screen, a processor, a memory, a time schedule controller and a communication interface. The processor is used for carrying out gray level calculation on the image to be projected to convert the image into a gray level image; the memory is used for storing the gray level image and the lookup table; the time sequence controller is used for searching the lookup table according to the temperature of the ink screen and outputting driving waveform parameters of the gray level image; and the communication interface transmits the driving waveform parameters to the far-end display screen.
In another aspect, the present invention discloses a method for projecting a screen to a remote display screen through a reading terminal, comprising: carrying out gray level calculation on an image to be projected to convert the image into a gray level image; reading the gray image and the lookup table; searching the lookup table according to the temperature, and outputting driving waveform parameters of the gray level image; and sending the driving waveform parameters to the remote display screen.
In another aspect, the invention discloses a computer readable storage medium having stored thereon computer program code for projecting a page of a reading terminal to a remote display for display, which when executed by a processor, performs the aforementioned method.
The reading terminal provided by the invention provides the driving waveform parameters of the gray level image for the far-end display device so as to reduce the time for processing the gray level of the far-end display device, so that the display picture of the reading terminal and the display picture of the far-end display device are synchronous, and the user experience is improved.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the invention are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 is a schematic diagram showing a reading terminal of an embodiment of the present invention;
fig. 2 is a schematic view showing a display device of an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the environment of an embodiment of the present invention;
FIG. 4 is a schematic diagram of an original color image showing RGB 888;
fig. 5 is a block diagram showing a color filter combined with an ink screen according to an embodiment of the present invention;
fig. 6 is a pixel diagram showing a color filter film according to an embodiment of the present invention; and
fig. 7 is a flowchart illustrating a method for dropping a screen to a remote display screen through a reading terminal according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "first," "second," "third," and "fourth," etc. in the claims, specification and drawings of the present invention are used for distinguishing between different objects and not for describing a particular sequential order. The terms "comprises" and "comprising" when used in the specification and claims of the present invention are taken to specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should be further understood that the term "and/or" as used in the present specification and claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in this specification and the claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context.
Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
One embodiment of the invention is a system capable of projecting a screen to a remote display screen, which is used for transmitting a page of a reading terminal to a remote display device for display in real time. The reading terminal has a structure as shown in fig. 1.
As shown in fig. 1, the reading terminal 100 includes: processor 101, communication interface 102, power supply assembly 103, display 104, audio assembly 105, memory 106, and key interface 107.
The processor 101 may be a central processing unit CPU or an application specific integrated circuit ASIC or an integrated circuit configured to implement an embodiment of the present invention. Furthermore, the reading terminal 100 may include multiple processors, which may be the same type of processor or different types of processors, such as multiple CPUs, multiple ASICs, or one CPU plus one ASIC.
The communication interface 102 is configured as a module for wireless communication between the reader terminal 100 and other devices, including Bluetooth 112, wiFi antenna 122, 4G/5G antenna communication 132, and the like. In other embodiments, the communication interface 102 further includes a Near Field Communication (NFC) module to facilitate short range communications.
The power supply assembly 103 provides power to the various components of the reading terminal 100. The power supply assembly 103 may include an external power supply interface 113 and a charging interface circuit 123.
The display 104 refers to an interactive display interface between the reading terminal 100 and the user, and includes an electromagnetic film 114, a capacitive screen 124, an ink screen 134, and the like.
The electromagnetic film 114 is used for receiving signals of the electromagnetic pen, the signals are judged by magnetic field changes generated by the sensor in the operation process of the electromagnetic pen and under the panel, the electromagnetic pen is a signal transmitting end, the electromagnetic film 114 is a signal receiving end, when the electromagnetic pen approaches induction, the magnetic flux changes, and the position point is defined by operation.
Capacitive screen 124 is a touch screen to receive signals from user finger inputs that includes one or more touch sensors to detect touches, swipes, and gestures on the touch screen panel. The touch sensor may detect not only the boundary of a touch or sliding action, but also the duration and pressure associated with the touch or sliding operation.
The electromagnetic film 114 and the capacitive screen 124 are collectively referred to as a touch screen 174.
The ink screen 134 is a display screen using electronic ink, also known as an electronic paper display technology, and mainly includes a top transparent electrode layer, an electrophoretic layer, and a bottom electrode pixel layer. The electrophoresis layer is internally provided with a plurality of tiny microcapsules, transparent liquid and a plurality of tiny electrophoresis particles are arranged in the microcapsules, the electrophoresis particles are distributed in the transparent electrophoresis liquid to form a suspension system, the surfaces of the electrophoresis particles are easy to absorb charges, and the particles capable of inducing the charges can move under the action of an external electric field.
Specifically, the electrophoretic particles are classified into negatively charged black particles and positively charged white particles. When a positive voltage is applied to the bottom electrode pixel layer, the white particles are repelled and move towards the top transparent electrode layer, and the black particles are attracted and move towards the bottom electrode pixel layer, in which case the pixel appears white. Conversely, when a negative voltage is applied to the bottom electrode pixel layer, the white particles are attracted to move toward the bottom electrode pixel layer, the black particles are repelled to move toward the top transparent electrode layer, and the pixel appears black.
The color filter 136 is superimposed on the ink screen 134, and controls the intensities of reflected light of the three primary colors red (R), green (G), and blue (B), thereby displaying a desired color by additive color mixing. The color filter 136 absorbs other color components by polarization effects, such as absorbing a bluish-green component when natural light is irradiated to the red portion of the color filter 136, allowing only the red component to pass therethrough, and thus the human eye sees red. The color filter 136 may be directly printed with red, green and blue colors on the ink screen or adhered to the ink screen in the form of a film, and the basic structure of the film includes a filter glass substrate, and a photoresist layer with red, green and blue colors in each pixel on the filter glass substrate. Specifically, the black particles of the ink screen 134 absorb light, and conversely, the white particles reflect light, so if red is to be displayed, positive electricity is applied to the electrode at the red position to attract the black particles downward, so that the white particles move toward the top transparent electrode layer, the light reflected by the white particles will display red through the pixel at the red position corresponding to the color filter film 136, and the voltage of the control electrode controls the ratio of the white particles to the black particles at the top transparent electrode layer, so that the gray scale (brightness) of the pixel is controlled, and the shade of red is indirectly controlled. In summary, the movement of the black particles and the white particles in the microcapsules is controlled to control the gray level of the microcapsules, and the color filter 136 is used to display the color of the specific pixel by mixing the colors of red, green and blue with different shades.
The display 104 also includes a sensing component 144 configured with a plurality of miscellaneous sensors for providing status assessment of various aspects of the electronic device. For example: the temperature sensor 154 in the sensing assembly 144 can detect a temperature change of the display 104, and the detected temperature is transmitted to the processor 101 and then to the timing controller 108 as a parameter of a look-up table.
The display 104 further includes a front light and a light guide plate 164 disposed at the sides of the display 104 to provide a stable and uniform light source.
The audio component 105 is configured to output and/or input audio signals. For example, the audio component 105 includes a microphone 118, and when the reading terminal 100 needs to receive voice, such as a call mode, a recording mode, and a voice recognition mode, the microphone 118 is configured to receive an external audio signal. The audio assembly 105 further includes a speaker 128 for outputting audio signals.
The memory 106 is used to store programs, electronic books, and notes, and may be a high-speed RAM memory or a non-volatile memory (nonvolatile memory), such as a disk memory.
The key interface 107 is used for enabling a user to control page turning, typically physical keys, disposed on the side of the reading terminal 100, including a front page turning key and a back page turning key.
The timing controller 108 is configured to find the corresponding control parameter, i.e. the driving waveform, through the lookup table. Since black and white particles in the ink screen 134 are relatively sensitive to temperature, the lower the temperature, the poorer the particle activity and the longer the time required to move to the same position in the microcapsule at room temperature; the higher the temperature, the faster the particle movement and the relatively shorter the time required to move to the same position in the microcapsule at ambient temperature. The temperature sensor 154 collects temperature data on the display 104, and the timing controller 108 finds corresponding control parameters according to the temperature data to select an appropriate driving waveform.
The display driver 109 converts the driving waveform into a control signal to drive the ink particles on the ink screen 134 to move so that image data to be displayed can be imaged on the ink screen 134.
The remote display device 200 of this embodiment may be any device having a display screen, such as a screen, a television, a projection apparatus, etc., and the structure thereof is shown in fig. 2. The remote display device 200 includes: processor 201, memory 202, display 203, communication interface 204, and communication bus 205. The processor 201 is configured to perform image information processing; the memory 202 is used to store various image information; the display screen 203 is used for displaying the processed page; the communication interface 204 is used for communicating with the reading terminal 100, for example, receiving the screen projection information; the communication bus 205 serves as a conduit for the processor 201, memory 202, display 203, and communication interface 204 to communicate information with each other.
Fig. 3 is an environment showing this embodiment, which includes the reading terminal 100, the remote display device 200, and the wireless network router 301. The reading terminal 100 and the remote display device 200 are connected through a wireless network router 301, and if the wireless network is an internal network, the wireless network router 301 is a WIFI hotspot, if the wireless network is a short-range network, the wireless network router 301 is a bluetooth module or an NFC module, and if the wireless network is a long-range network, the wireless network router 301 is a 4G or 5G base station.
The pixel mapping relationship between the ink screen 134 and the color filter 136 is further described below with reference to fig. 4 to 6. Fig. 4 shows a schematic diagram of pixels of an image to be displayed, wherein the image to be displayed is formed by combining colors of pixels, the data structure of the pixels is RGB888, and the data structure of the pixels is represented by using 8 bytes to record red color values, green color values and blue color values respectively, and the color value of each color ranges from 0 to 255. In more detail, the color of one pixel unit 41 of the image to be displayed is composed of the mixture of the three primary colors of RGB emitted by the pixel unit, each pixel has three color components of red, green and blue, and each pixel has a corresponding color value of RGB888, wherein the components refer to the intensity values of the colors in the range of 0-255.
Fig. 5 is a schematic diagram showing a structure of the color filter 136 combined with the ink screen 134 according to an embodiment of the present invention, as shown in fig. 5, the color filter 136 is superimposed on the ink screen 134, which expresses three primary colors in a unit of one pixel unit 510, and three adjacent pixels (e.g., pixels 521, 522, 523) in the ink screen 134 correspond to the pixel unit 510 of the color filter 136, wherein the pixels 521, 522, 523 each generate three color components of red, green, and blue.
The embodiment of the invention uses the color filter 136 to realize colors, as shown in fig. 6, and different colors such as RGB are printed on the color filter 136. In practical applications, to make the expression of colors more natural, the arrangement of RGB may also be irregular, such as RBG RGB BRG BGR, and the order is preset when the color filter 136 is manufactured.
In some implementations, each pixel on the image to be displayed has three color components of RGB, but the location on the color filter 136 corresponding to that pixel can only be printed with one color, so that three color components cannot be presented to a single pixel on the color filter 136. For the above reasons, this embodiment takes three pixel points on the color filter film 136 as one pixel unit 510, and sequentially prints three primary colors of RGB, respectively. For example, in pixel unit 510, processor 101 uses the red color printed on first pixel 611 to express the red component of ink screen pixel 521 (shown in FIG. 5) and the green color printed on second pixel 612 to express the green component of ink screen pixel 522; the blue component of the ink screen pixel 523 is expressed using the blue color printed on the third pixel 613.
Since three pixels on the ink screen 134 are mapped to one pixel unit on the color filter 136, the DPI of the color filter 136 is reduced to one third of the original, typically 300 for a black-and-white ink screen 134, and the DPI becomes 100 after the color filter 136 is combined.
In more detail, the processor 101 retains corresponding color component values among RGB values of the pixel according to colors printed at corresponding positions on the color filter film 136, and discards the remaining color component values. Printed on the first pixel 611 of the color filter film 136 is red, which is used to express only the red component of the pixel 521 of the ink screen 134, and thus, the green component and the blue component are not preserved; similarly, the second pixel 612 of the color filter 136 is printed with green, only the green component of the pixel 522 of the ink screen 134 is represented, the red component and the blue component are not preserved, and so on.
The processor 101 then converts the retained color component values into gray values of 16 gray. Since different gray scales correspond to different light and shade effects, gray scales of a single primary color can be displayed through the color filter film 136, and for example, red can be displayed by controlling the gray scales of red, purplish red, scarlet, light red, pink and the like. For one pixel unit, different color effects can be realized by controlling the combination of the gray scales of the three primary colors. In this embodiment, each primary color component of RGB has 16 effects of shades, the number of colors that can be achieved by a pixel element is 16 x 16 a total of 4096.
Finally, the processor 101 controls the display driver 109 to drive the ink screen 134 to display. The ink screen 134 displays the gray scale of red, green and blue pixels, and the original color picture is displayed by color mixing through the color filter film 136.
The ink screen 134 of this embodiment may also display a switch button for enabling the user to switch between the neutral or color modes. When the user clicks the switching key, the touch screen 174 receives a touch instruction generated by the user clicking the switching key and sends the touch instruction to the processor 101, and the processor 101 responds to the touch instruction to switch the non-color mode or the color mode. If a color picture is being displayed and the user clicks the switching key, the processor 101 displays the image to be displayed in a gray scale picture, which indicates that the user wants to switch to a non-color mode; if the non-color picture is being displayed and the user clicks the switch button, it indicates that the user wants to switch to the color mode, and the processor 101 displays the image to be displayed as a color picture. The above-described achromatic mode is not capable of displaying only two colors of black and white, but can display an effect of 16 gray scales.
The timing controller 108 of this embodiment may be implemented by means of an algorithm, i.e. a software timing controller, in addition to being implemented in hardware as shown in fig. 1. The software timing controller is an algorithm integrated on a System-on-a-Chip (hereinafter referred to as SOC Chip), and the process of converting the gray-scale image into the output of the driving waveform is equivalent to being performed on the SOC Chip.
The following description will be made based on examples of gray-scale screen display projection and color screen display projection, respectively.
Taking the gray-scale screen display projection screen as an example, although the screen to be displayed may be colored, the reading terminal 100 and the remote display device 200 both display the gray-scale screen. First, the processor 101 performs gradation calculation on an image to be displayed to convert into a gradation image, and outputs a driving waveform corresponding to the gradation image through the timing controller 108 to drive the ink panel 134 to display the gradation screen.
In more detail, the processor 101 calculates a gray value using RGB three color values of each pixel, converting the image to be displayed into 8-bit gray data. The calculation mode can be any one of the following:
1. floating point method: gray=r 0.3+g 0.59+b 0.11;
2. integer method: gray= (r×30+g×59+b×11)/100;
3. shifting method: gray= (r×77+g×151+b×28) >8;
4. average method: gray= (r+g+b)/3.
The converted gray value is 8 bits, namely the gray value range is 0 to 255, and 256 different gray values are all obtained. Through a preset mapping relationship, the processor 101 converts the gray value of the pixel into one of 16 gray levels, wherein the 16 gray levels take values of 0 to 15, wherein 0 is pure white, 15 is pure black, and each value in the middle is gray with different depths. After the conversion is completed, gradation data is recorded using 4-bit data.
In more detail, this embodiment sets the mapping relationship between 256 gray levels and 16 gray levels as: 0 to 16 of 256 gradations corresponds to 0 of 16 gradations, 17 to 32 of 256 gradations corresponds to 1 of 16 gradations, 33 to 48 of 256 gradations corresponds to 2 of 16 gradations, and so on. Conversion may also be performed using a nonlinear mapping relationship, and each gray in the preset 16-gray image corresponds to a gray range in 256 gray levels.
The timing controller 108 performs a look-up table (LUT) according to parameters such as a previous frame gray value, a next frame gray value, and a current ink screen temperature of each pixel in the 4-bit gray data, to obtain a suitable driving waveform for driving black and white particles in each pixel from the current position to the next frame image position, where the driving waveform includes information such as voltage, pulse number, pulse duration, etc., and after obtaining the driving waveform by looking up the table, the driving waveform can be used to drive the ink capsules corresponding to the pixel position on the ink screen 134, so that the black and white particles in the ink capsule do different distance movements, and form a corresponding gray color. Wherein the temperature data is provided by the temperature sensor 154. Finally, the ink screen 134 is driven according to the searched driving waveform, so that the image to be displayed is displayed.
In the case of performing the non-color mode display, the gray scale effect can be displayed while the color filter film 136 is covered, because the color image is not discarded and retained according to the pixel color arrangement position of the color filter film 136, and therefore the color component represented by the display gray scale of the pixel on the ink screen 134 does not correspond to the color printed on the color filter film 136 in a physical space, and therefore the color filter film 136 does not perform polarization filtering on the gray scale on the ink screen 134 when the light is reflected, and the color expression capability is lost, and only the gray scale of the ink screen 134 is displayed.
Further, the reading terminal 100 transmits the gray image to the memory 106 to wait for display, and the memory 106 may be a display buffer or a frame buffer. Next, the reading terminal 100 reads the gradation image to be displayed for the next frame from the memory 106 in the display order of the image frames, and obtains the driving waveform of the image by the timing controller 108 according to the temperature lookup table of the ink screen 134. In particular, the parameters required for table lookup include: the gray value of each pixel in the previous frame image, the gray value of each pixel in the next frame image, the temperature information of the ink screen 134 provided by the temperature sensor 154, and the like. The driving waveform parameters obtained by table lookup include: driving voltage, pulse number, pulse duration, and the like of each pixel point.
Since the ink screen 134 displays images by moving black and white particles, after multiple page turning, the image will often have a ghost, especially if the page includes a picture, so that it needs to be refreshed to remove the ghost to make the page more compact. In the invention, a 16-gray-scale local refreshing mode or a full-screen refreshing mode is adopted, and when the ghost is not serious and needs to be refreshed quickly, the local refreshing mode can be used, for example, GU16 directly outputs 16-gray-scale pixels with changed output from the last time without performing screen cleaning operation before data output. In some application scenarios, the color display refresh residual image is heavy, and a full-screen refresh mode may be adopted, for example, GC16 re-outputs all pixels in the refresh area, and before outputting, performs a screen-cleaning operation on the refresh area, and can support up to 16 gray-scale pixels.
When the display screen 203 of the remote display device 200 is also an ink screen, since the hardware characteristics between the ink screen 134 of the reading terminal 100 and the display screen 203 of the remote display device 200 are not absolutely identical, when the same gray scale is required to be displayed, the driving voltage, the pulse duration may be different due to a slight difference in the charge of ink particles or a slight difference in the resistance of the filling liquid. Each ink screen needs to be manually measured and set to drive parameters in the lookup table before leaving the factory, but in an actual application scene, the screen-throwing interconnection of the reading terminal is mostly short-distance interconnection, such as WIFI direct connection or bluetooth connection under the same area network environment, so that the environmental temperature difference between the reading terminal 100 and the remote display device 200 is negligible, and the remote display device 200 can directly refresh the driving wave display shape obtained based on the temperature parameters detected by the temperature sensor 154 of the reading terminal 100 without further temperature detection.
For the above reasons, the following three embodiments are provided in the present invention, so that the reading terminal 100 can transmit the driving waveform parameters with the minimum error to the remote display device 200 after completing the table look-up operation.
A first embodiment. The reading terminal 100 and the remote display device 200 perform refreshing using the same driving parameters (i.e., the driving parameters of the reading terminal 100), and after refreshing and displaying N frames of images, gray-scale differences thereof are accumulated to a certain extent, for example: when the plain text is displayed for 10 to 20 frames, the image is displayed for 5 frames, and then the reading terminal 100 and the remote display device 200 synchronously perform a screen cleaning operation, so that all the ink particles are restored to the initial positions, and then the next frame of image is displayed.
A second embodiment. At the initial stage of establishing the remote screen-throwing connection, the remote display device 200 transmits the mapping relationship between the gradation and the driving waveform in its own lookup table (hereinafter collectively referred to as "first lookup table") to the reading terminal 100 and stores in advance in the memory 106. When the screen is thrown, the reading terminal 100 establishes a relative mapping relation between the first lookup table and the second lookup table according to the lookup table (hereinafter collectively referred to as "second lookup table") and the first lookup table of the remote display device 200, that is, determines the difference of the driving parameters in the first lookup table and the second lookup table of the same gray scale at the same temperature based on the gray scale, and corrects the driving parameters to be transmitted according to the difference when the screen is thrown.
Third embodiment. The remote display device 200 transmits the first lookup table mapping relationship to the reading terminal 100 and stores it in the memory 106 in advance. When the screen is displayed, the reading terminal 100 reads the gray level image from the memory 106, and then uses the first lookup table and the second lookup table to query the driving waveform parameters respectively, wherein the driving waveform parameters queried by using the second lookup table are used for the display of the reading terminal 100, and the driving waveform parameters queried by the first lookup table are sent to the remote display device 200 for use. When the two look-up processes need to be performed sequentially, considering network transmission delay, the first look-up table can be searched first to obtain the driving waveform of the remote display device 200, and the second look-up table can be searched again to obtain the waveform used by the reading terminal 100 in the process of sending the driving waveform to the remote display device 200, so as to reduce the delay gap between the two synchronous displays.
Next, taking a color display projection screen as an example, the ink screen 134 presents a color picture through the color on the color filter film 136. As described above, the data structure of the pixels of the image to be displayed is RGB888. First, the processor 101 subjects an image to be displayed to a quantization process to discard and retain a component value of one of red, green, and blue pixels, and then converts the formed image into a gray scale image. The purpose of converting into a gray image is to be able to adapt to the display of the ink screen 134, and the color expression of the image to be displayed is realized by the color filter film 136, and the ink screen 134 itself is to follow the display mechanism of black and white particles, that is, the ink Shui Bing 134 itself cannot directly display the color image, but the display effect of the color filter film 136 is affected by the shade of gray, so that various colors are realized.
In the process of the componentization, the processor 101 retains a component value of one of the red, green and blue pixels on the color filter film 136 corresponding to a pixel of the image to be displayed, converts the gray scale of the image to be displayed into 8-bit gray scale data according to the component value, and converts the 8-bit gray scale data into 4-bit gray scale data.
In another implementation, the data structure of some color images is RGBA8888, with an 8-bit transparency value added, and the processor 101 directly ignores the transparency value because the ink screen 134 of this embodiment does not reflect transparency.
Then, the timing controller 108 outputs a driving waveform corresponding to the gray scale image to drive the ink screen 134 to display the gray scale of the red, green and blue pixels, and the color filter film 136 presents a color picture according to the gray scale of the red, green and blue pixels, so as to realize the refreshing display of the image to be displayed. The table look-up and refreshing methods are as described above and will not be described in detail herein.
Fig. 7 is a diagram illustrating another embodiment of the present invention, which is a method 700 for dropping a screen to a remote display screen via a reading terminal. As shown in fig. 7, this embodiment includes the steps of:
in step 701, a gray scale calculation is performed on an image to be projected to convert into a gray scale image. The image to be projected is converted into gray image through gray calculation no matter the image is projected to a black-and-white ink screen or a color ink screen, and the gray calculation from the screen to the black-and-white ink screen is realized by a floating point method, an integer method, a shift method or an average value method; the gray scale calculation from the screen to the color ink screen is performed by using a quantization process. The detailed manner of converting into the gray scale image is described in the above embodiments, and will not be repeated.
In step 702, a grayscale image and a look-up table are read. Specifically, the converted gray-scale image and the lookup table are taken.
In step 703, the driving waveform parameters of the gray scale image are output according to the temperature lookup table. In more detail, the lookup table comprises a first lookup table of the remote display screen and a second lookup table of the reading terminal. The above embodiments provide three implementations of outputting the driving waveform parameters of the gray scale image, which are not described in detail.
In step 704, the driving waveform parameters are sent to the remote display screen. After the reading terminal completes the table look-up operation, the driving waveform parameters are sent to the far-end display device to display the image to be projected.
Another embodiment of the invention is a computer readable storage medium having stored thereon computer program code for projecting a page of a reading terminal to a remote display screen for display, which when executed by a processor, performs a method as shown in fig. 7.
It should also be appreciated that any of the modules, units, components, servers, computers, terminals, or devices illustrated herein that execute instructions may include or otherwise access a computer readable medium, such as a storage medium, computer storage medium, or data storage device (removable) and/or non-removable, such as magnetic disk, optical disk, or magnetic tape. Computer readable storage media may include volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information, such as computer readable instructions, data structures, program modules or other data.
Computer-readable storage media includes RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by an application, module, or both. Any such computer-readable storage media may be part of, or accessible by, or connected to the device. Any of the applications or modules described herein may be implemented using computer-readable/executable instructions that may be stored or otherwise maintained by such computer-readable media.
From the foregoing description of the embodiments, those skilled in the art can understand that the reading terminal of the present invention does not call the system interface to capture a color image, but directly sends driving waveform parameters, and for a remote display device, the ink screen may be directly driven to refresh according to the driving waveform parameters. The display pictures of the reading terminal and the remote display device are synchronized, so that the user experience is improved.
The foregoing has described in detail embodiments of the present disclosure, with specific examples being employed herein to illustrate the principles and implementations of the present disclosure, the above examples being provided solely to assist in the understanding of the methods of the present disclosure and their core ideas; also, as will be apparent to those of ordinary skill in the art in light of the present disclosure, there are variations in the detailed description and the scope of the application, which in light of the foregoing description should not be construed to limit the present disclosure.
Claims (21)
1. A reading terminal capable of projecting a screen to a remote display screen, comprising:
an ink screen;
the processor is used for carrying out gray level calculation on the image to be projected to convert the image into a gray level image;
the memory is used for storing the gray level image and the lookup table; the lookup table comprises a first lookup table of the remote display screen and a second lookup table of the reading terminal;
the time sequence controller is used for searching the second lookup table according to the temperature of the ink screen and outputting driving waveform parameters of the gray level image; the processor determines the difference of the driving parameters in the first lookup table and the second lookup table at the same temperature of the same gray level by taking the gray level as a reference, and corrects the driving waveform parameters;
and the communication interface is used for transmitting the corrected driving waveform parameters to the remote display screen.
2. The reading terminal of claim 1, wherein the processor converts the image to be screened into 8-bit gray data using a floating point method, an integer method, a shift method, or an average method.
3. The reading terminal of claim 2, wherein the processor converts the 8-bit gray data into 4-bit gray data, and the timing controller outputs the driving waveform parameters according to the 4-bit gray data look-up table.
4. The reading terminal of claim 1, wherein the driving waveform parameters comprise: information of at least one of a driving voltage, a pulse number, and a pulse duration of each pixel.
5. The reading terminal of claim 1, wherein the processor subjects the image to be projected to a componentization process to convert into the gray scale image, and generates, by the timing controller, a gray scale of the driving waveform parameters corresponding to red, green, and blue pixels.
6. The reading terminal of claim 5, wherein the processor retains a component value corresponding to one of the red, green, and blue pixels in the image to be screened when performing the quantization process.
7. The reading terminal of claim 6, wherein the processor converts the to-be-screened image into 8-bit gray scale data according to the component values.
8. The reading terminal of claim 7, wherein the processor converts the 8-bit gray data into 4-bit gray data, and the timing controller outputs the driving waveform parameters according to the 4-bit gray data.
9. The reading terminal of claim 1, wherein the processor controls the reading terminal and the remote display to refresh simultaneously after N frames of images are continuously displayed.
10. The reading terminal according to claim 1, wherein after searching the first lookup table, the timing controller searches the second lookup table, and the ink screen displays the image to be projected according to the driving waveform parameter output by the second lookup table corresponding to the gray scale image.
11. A method for dropping a screen to a remote display screen through a reading terminal, comprising:
carrying out gray level calculation on an image to be projected to convert the image into a gray level image;
reading the gray image and the lookup table; the lookup table comprises a first lookup table of the remote display screen and a second lookup table of the reading terminal;
searching the second lookup table according to the temperature, and outputting driving waveform parameters of the gray level image; the processor determines the difference of the driving parameters in the first lookup table and the second lookup table at the same temperature of the same gray level by taking the gray level as a reference, and corrects the driving waveform parameters;
and sending the corrected driving waveform parameters to the remote display screen.
12. The method of claim 11, wherein the gray scale calculating step comprises:
and converting the image to be projected into 8-bit gray data by using a floating point method, an integer method, a shift method or an average value method.
13. The method of claim 12, wherein the gray scale calculation step further comprises:
converting the 8-bit gray data into 4-bit gray data;
and the output step outputs the driving waveform parameters according to the table look-up of the 4-bit gray data.
14. The method of claim 11, wherein the drive waveform parameters comprise: information of at least one of a driving voltage, a pulse number, and a pulse duration of each pixel.
15. The method of claim 11, wherein the gray scale calculating step comprises:
performing componentization processing on the image to be projected to convert the image to be projected into the gray level image;
wherein the driving waveform parameter corresponds to the gray scale of the red, green and blue pixels.
16. The method of claim 15, wherein the step of componentizing comprises:
and reserving component values corresponding to one of the red, green and blue pixels in the image to be projected.
17. The method of claim 16, wherein the gray scale calculating step comprises:
and converting the image to be projected into 8-bit gray data according to the component values.
18. The method of claim 17, wherein the gray scale calculating step comprises:
converting the 8-bit gray data into 4-bit gray data;
wherein the outputting step outputs the driving waveform parameters according to the 4-bit gradation data.
19. The method of claim 11, further comprising:
and after continuously displaying N frames of images, controlling the reading terminal and the far-end display screen to simultaneously clear and refresh.
20. The method of claim 11, further comprising:
reading the second lookup table;
after searching the first lookup table, searching the second lookup table; and
and outputting the driving waveform parameters corresponding to the gray level image according to the second lookup table to display the image to be projected.
21. A computer readable storage medium having stored thereon computer program code for projecting a screen onto a remote display screen by a reading terminal, which, when executed by a processor, performs the method according to any of claims 11 to 20.
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| CN114677973A (en) * | 2020-12-24 | 2022-06-28 | 元太科技工业股份有限公司 | Electrophoretic display device and driving method thereof |
| CN112965678A (en) * | 2021-03-16 | 2021-06-15 | 广州文石信息科技有限公司 | Display, device, storage medium and method based on electronic ink screen |
| CN114373430B (en) * | 2022-01-21 | 2023-07-21 | 重庆京东方智慧电子系统有限公司 | Electrophoretic particle driving data display method and device, equipment and medium |
| CN115762428B (en) * | 2022-11-23 | 2023-08-15 | 广州文石信息科技有限公司 | Display device and system based on electronic ink screen |
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