CN111752517A - Method, terminal and computer readable storage medium capable of projecting screen to remote display screen - Google Patents
Method, terminal and computer readable storage medium capable of projecting screen to remote display screen Download PDFInfo
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- 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
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Abstract
The invention discloses a method for 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 so as to convert the image to be projected 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 sends the driving waveform parameters to the remote display screen. The reading terminal provides the driving waveform parameters of the gray scale image for the far-end display device so as to reduce the time of gray scale 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 present invention relates to a method of projecting a page of a reading terminal to a remote display screen for display, a 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 feeling. Compared with a traditional display (such as an LCD or an LED), the technology of the electronic paper can enable eyes not to feel tired after long-time reading. Moreover, with the development of the internet, the reading terminal can download the electronic books, and has a large-capacity memory 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.
The display of the reading terminal is not too large for portability, but in some use environments, such as at home, a large display device is available. The reading terminal can be connected to other display equipment in a wired or wireless mode, and remote synchronous screen projection is carried out on the content in the display screen. In the existing screen projection display process, a reading terminal converts a color image to be displayed into a gray image, transmits the gray image to a time schedule controller for driving and displaying, calls a system interface to perform screen capture on the color image to be displayed, and sends the color image to a far-end display device. And after receiving the screenshot, the far-end display device drives and displays the color image.
However, in the transmission process, the image acquired by the remote display device is a color image without undergoing gray scale processing, so the remote display device needs to perform gray scale processing operation to display the image, and this process takes a while, which causes a certain delay. Especially, when the synchronization process also involves handwriting operation, the delay is more serious 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, a reading terminal and a computer-readable storage medium for projecting a screen to a remote display screen.
In one aspect, the present invention discloses a reading terminal capable of projecting a screen to a remote display screen, comprising: ink screen, treater, memory, time schedule controller and communication interface. The processor is used for carrying out gray level calculation on the image to be projected so as to convert the image to be projected 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; and the communication interface sends 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 so as to convert the image to be projected into a gray level image; reading the gray level image and a lookup table; searching the lookup table according to the temperature, and outputting the driving waveform parameters of the gray level image; and sending the driving waveform parameters to the remote display screen.
In another aspect, the present 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 screen for display, the computer program code, when executed by a processor, performing the aforementioned method.
The reading terminal provides the driving waveform parameters of the gray scale image for the far-end display device so as to reduce the time for processing the gray scale by 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 and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:
fig. 1 is a schematic diagram illustrating 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 an environment for an embodiment of the present invention;
FIG. 4 is a schematic diagram showing an original color image of RGB 888;
FIG. 5 is a block diagram illustrating a color filter in combination with an ink screen according to an embodiment of the present invention;
FIG. 6 is a pixel diagram showing a color filter according to an embodiment of the present invention; and
fig. 7 is a flow chart illustrating a method for projecting a screen to a remote display screen through a reading terminal according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the terms "first", "second", "third" and "fourth", etc. in the claims, the description and the drawings of the present invention are used for distinguishing different objects and are not used for describing a particular order. The terms "comprises" and "comprising," when used in the specification and claims of this specification, 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 of this application, the singular form of "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 specification and claims of this specification 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 claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection".
The following detailed description of embodiments of the invention refers to the accompanying drawings.
One embodiment of the present invention is a system capable of projecting a screen to a remote display screen, which is used to transmit 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: a processor 101, a communication interface 102, a power component 103, a display 104, an audio component 105, a memory 106, and a key interface 107.
The processor 101 may be a central processing unit CPU or a specific integrated circuit ASIC or an integrated circuit configured to implement an embodiment of the invention. Furthermore, the reading terminal 100 can include multiple processors, which can be of the same type or different types of processors, such as multiple CPUs, multiple ASICs, or a CPU plus an ASIC.
The communication interface 102 is configured as a module for wireless communication between the reading terminal 100 and other devices, including bluetooth 112, WiFi antenna 122, 4G/5G antenna communication 132, and the like. In another embodiment, the communication interface 102 further includes a Near Field Communication (NFC) module to facilitate short-range communications.
The power supply component 103 provides power to the various components of the reading terminal 100. The power supply assembly 103 may include an external power interface 113 and a charging interface circuit 123.
The display 104 is 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 an electromagnetic pen, and is distinguished by magnetic field changes generated by inductors under an electromagnetic pen operating process and a panel, the electromagnetic pen is a signal transmitting end, the electromagnetic film 114 is a signal receiving end, magnetic flux changes when the electromagnetic pen is close to induction, and position points are defined through operation.
The capacitive screen 124 is a touch screen for receiving signals from a user's finger input and includes one or more touch sensors to detect gestures on the touch, slide and touch screen panels. The touch sensor may detect not only the boundary of a touch or slide action, but also the duration and pressure associated with the touch or slide 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 called electronic paper display technology, and has a main structure including a top transparent electrode layer, an electrophoretic layer, and a bottom electrode pixel layer. The electrophoretic layer is internally provided with a plurality of fine microcapsules, the microcapsules are provided with transparent liquid and a plurality of tiny electrophoretic particles, the electrophoretic particles are distributed in the transparent electrophoretic liquid to form a suspension system, the surfaces of the electrophoretic particles are easy to adsorb electric charges, and the particles capable of inducing the electric 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 to move toward the top transparent electrode layer, and the black particles are attracted to move toward 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 is displayed as black.
A color filter 136 is superimposed on the ink panel 134, and displays a desired color by additive color mixing by controlling the intensity of reflected light of three primary colors, red (R), green (G), and blue (B). The color filter 136 absorbs other color components by polarization effects, for example, when natural light is irradiated on a red portion of the color filter 136, it absorbs a blue-green component, only a red component is transmitted therethrough, and thus the human eye sees red. The color filter 136 can be printed directly on the ink screen or adhered to the ink screen in a membrane form, and the basic structure of the membrane form color filter includes a filter glass substrate, and each pixel on the filter glass substrate has a color light blocking layer with three primary colors of red, green, and blue. Specifically, the black particles of the ink panel 134 absorb light, and conversely, the white particles reflect light, so that if a red color is to be displayed, the electrode at the red position is charged with positive electricity to attract the black particles downward, and the white particles move toward the top transparent electrode layer, the light reflected by the white particles will display red color through the pixel at the red position corresponding to the color filter 136, and the voltage of the electrode is controlled to control the ratio of the white particles to the black particles on the top transparent electrode layer, thereby controlling the gray scale (brightness) of the pixel and indirectly controlling the shade of the red color. In summary, the movement of the black particles and the white particles in the red, green and blue microcapsules is controlled to control the gray level of the microcapsules, and the color filters 136 are used to display the red, green and blue colors with different shades for color mixing, thereby displaying the color of the specific pixel.
The display 104 also includes a sensing component 144 configured with a plurality of various sensors for providing various aspects of status assessment for the electronic device. For example: the temperature sensor 154 in the sensing element 144 can detect the 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 for table lookup.
The display 104 further includes a front light and light guide plate 164 disposed at a side 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 speech, such as a call mode, a recording mode, and a speech recognition mode, the microphone 118 is configured to receive external audio signals. The audio module 105 further comprises a speaker 128 for outputting audio signals.
The memory 106 is used for storing programs, electronic books and notes, and may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as a disk memory.
The key interface 107 is used for controlling the page turning of the user, and is generally physical keys, which are disposed at the side of the reading terminal 100 and include a front page turning key and a back page turning key.
The timing controller 108 is used for finding out the corresponding control parameter, i.e. the driving waveform, through the lookup table. Since the black and white particles in the ink screen 134 are sensitive to temperature, the lower the temperature, the less active the particles, the longer it takes to move to the same position in the microcapsule at room temperature; the particles move faster when the temperature is higher, and the time required to move to the same location in the microcapsule is relatively shorter compared to the time required at normal 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 device, etc., and is configured as shown in fig. 2. The remote display device 200 includes: a processor 201, a memory 202, a display 203, a communication interface 204, and a communication bus 205. The processor 201 is used for executing image information processing; the memory 202 is used for storing 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, such as receiving screen projection information; the communication bus 205 serves as a conduit for information transfer between the processor 201, the memory 202, the display 203, and the communication interface 204.
Fig. 3 is an environment showing this embodiment, and the environment includes the reading terminal 100, the remote display device 200, and the wireless network router 301. The reading terminal 100 and the far-end display device 200 are connected through a wireless network router 301, 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 panel 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, the image to be displayed is formed by combining colors of pixels, a data structure of the pixels is RGB888, which represents that 8 bytes are used to record a red color value, a green color value and a blue color value respectively, and a value of each color value ranges from 0 to 255. More specifically, the color of one pixel unit 41 of the image to be displayed is formed by mixing 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 component refers to an intensity value of each color within a range of 0 to 255.
Fig. 5 is a schematic diagram illustrating a structure of the color filter 136 combined with the ink panel 134 according to an embodiment of the invention, as shown in fig. 5, the color filter 136 is superimposed on the ink panel 134, and expresses three primary colors by using one pixel unit 510 as a basic unit, and three adjacent pixels (e.g., pixels 521, 522, 523) in the ink panel 134 correspond to the pixel unit 510 of the color filter 136, wherein the pixels 521, 522, 523 generate three color components of red, green and blue, respectively.
Fig. 6 shows a schematic diagram of implementing colors by using a color filter 136 according to an embodiment of the present invention, wherein different colors such as RGB are printed on the color filter 136. In practice, to make the color expression more natural, the RGB arrangement may also be irregular, such as RBG RGB BRG BGR, and the order is predetermined during the manufacture of the color filter 136.
In some implementations, each pixel in the image to be displayed has three color components of RGB, but the position of the color filter 136 corresponding to the pixel can only print one color, and thus the three color components cannot be displayed on the color filter 136 for a single pixel. For the above reasons, this embodiment uses three pixels on the color filter 136 as a pixel unit 510, and sequentially prints three primary colors of RGB. For example, in pixel unit 510, processor 101 uses the red color printed on first pixel 611 to express the red color component of ink screen pixel 521 (shown in FIG. 5), and uses the green color printed on second pixel 612 to express the green color component of ink screen pixel 522; the blue color printed on the third pixel 613 is used to express the blue color component of the ink screen pixel 523.
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, and the DPI of the black and white ink screen 134 is generally 300, which becomes 100 after combining the color filter 136.
In more detail, the processor 101 retains the corresponding color component value of the RGB values of the pixel according to the color printed at the corresponding position on the color filter 136, and discards the rest of the color component values. The first pixel 611 of the color filter 136 is printed with red color only to express the red component of the pixel 521 of the ink panel 134, and therefore, the green and blue components are not retained; similarly, the second pixel 612 of the color filter 136 is printed with green color to represent only the green color component of the pixel 522 of the ink screen 134, and the red and blue color components are not retained, and so on.
The processor 101 then converts the remaining color component values into a gray scale value of 16 gray. Since different gray scales correspond to different light and shade effects, the gray scale of a single primary color can be displayed through the color filter 136, and when red is taken as an example, the gray scale can be controlled to display deep red, date red, bright red, light red, pink and the like. For one pixel unit, different color effects can be realized by controlling the combination of the gray levels of the three primary colors. In this embodiment, there are 16 shades of each primary color component of RGB, and the number of colors that can be realized by one pixel unit is 16 × 16 and 4096.
Finally, the processor 101 controls the display driver 109 to drive the display of the ink screen 134. The ink panel 134 displays the gray scale of red, green and blue pixels, and the original color image is displayed by color mixing of the color filter 136.
The ink screen 134 of this embodiment may also display a switch button for the user to switch between the non-color or color modes. When the user clicks the switch key, the touch screen 174 receives a touch instruction generated by the user clicking the switch 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 user indicates that the user wants to switch to the non-color mode, and the processor 101 displays the image to be displayed in a gray picture; if the user clicks the switch button to indicate that the user wants to switch to the color mode, the processor 101 displays the image to be displayed in the color screen. The above-mentioned achromatic mode can display 16 gray levels instead of displaying black and white.
The timing controller 108 of this embodiment may be implemented by means of an algorithm, that is, a software timing controller, in addition to being implemented by hardware as shown in fig. 1. The software timing controller is an algorithm integrated on a System-on-a-Chip (SOC Chip), and the process of color converting the gray image to the output of the driving waveform is equivalent to the execution on the SOC Chip.
The following description will be made by taking a gray-scale screen display projection screen and a color screen display projection screen as examples.
Taking the example of the gray-scale screen display projection screen, 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 a gray scale calculation on an image to be displayed to convert the image into a gray scale image, and outputs a driving waveform corresponding to the gray scale image through the timing controller 108 to drive the ink panel 134 to display the gray scale picture.
In more detail, the processor 101 calculates a gray value using three color values of RGB of each pixel, and converts the image to be displayed into 8-bit gray data. The calculation mode can be any one of the following modes:
1. floating point method: gray ═ R0.3 + G0.59 + B0.11;
2. integer method: gray ═ (R30 + G59 + B11)/100;
3. a shift method: gray ═ (R77 + G151 + B28) > > 8;
4. average value method: gray ═ R + G + B)/3.
The converted gray value is 8 bits, that is, the gray value range is 0 to 255, and there are 256 different gray levels. Through a preset mapping relationship, the processor 101 converts the gray value of the pixel into a certain one of 16 gray levels, the 16 gray levels take values from 0 to 15, wherein 0 is pure white, 15 is pure black, and the middle values are gray at different depths. After the conversion is completed, gradation data is recorded using 4-bit data.
In more detail, the mapping relationship between 256 gray scales and 16 gray scales in this embodiment is: 0 to 16 of the 256 shades of gray correspond to 0 of 16 shades of gray, 17 to 32 of the 256 shades of gray correspond to 1 of 16 shades of gray, 33 to 48 of the 256 shades of gray correspond to 2 of 16 shades of gray, and so on. The conversion can also be performed by using a non-linear mapping relationship, and each gray scale in the 16 gray scale image is preset to correspond to a gray scale range in 256 gray scales.
The timing controller 108 performs table look-up (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 the black-and-white particles in each pixel from a current position to a next frame image position, where the driving waveform includes information such as voltage, pulse frequency, and pulse duration, and after the driving waveform is obtained by table look-up, the driving waveform can be used to drive the ink capsules on the ink screen 134 corresponding to the pixel position, so that the black-and-white particles therein move at different distances to form corresponding gray colors. Where temperature data is provided by temperature sensor 154. And finally, driving the ink screen 134 according to the searched driving waveform to realize the display of the image to be displayed.
In the case of displaying in the non-color mode, the gray scale effect can be displayed in the embodiment under the condition of covering the color filter 136 because the color image is not discarded and retained according to the pixel color arrangement position of the color filter 136, so that the color component represented by the display gray scale of the pixel on the ink panel 134 does not correspond to the color printed on the color filter 136 in a consistent manner in the physical space, and therefore, when the light is reflected, the color filter 136 does not polarize and filter the gray scale on the ink panel 134 any more, loses the color expression capability, and only displays the gray scale of the ink panel 134.
Further, the reading terminal 100 sends the grayscale image to the memory 106 to await display, and the memory 106 may be a display buffer or a frame buffer. Next, the reading terminal 100 reads a gray image to be displayed for the next frame from the memory 106 in the display order of the image frames, and obtains a driving waveform of the image by referring to the lookup table according to the temperature of the ink panel 134 through the timing controller 108. Specifically, the parameters required for table lookup include: the gray value of each pixel in the previous image, the gray value of each pixel in the next image, the temperature information of the ink screen 134 provided by the temperature sensor 154, and the like. The drive waveform parameters obtained by table lookup include: and the driving voltage, the pulse frequency, the pulse duration and other information of each pixel point.
Since the ink screen 134 displays images by moving black and white particles, after a plurality of pages are turned, image sticking is often generated, especially if the pages include pictures, the image sticking is more likely to be generated, and therefore refreshing is required to remove the image sticking so as to make the pages more concise. The invention adopts a 16-gray local refresh mode or a full-screen refresh mode, and when the afterimage is not serious and the fast refresh is needed, the local refresh mode can be used, for example, GU16 directly outputs 16-gray pixels which are changed with the last output without performing the screen refresh operation before the data output. In some application scenarios, the color display has heavy refreshing afterimage, and a full screen refresh mode may also be used, for example, the GC16 re-outputs all pixels in the refresh area, performs a screen refresh operation on the refresh area before outputting, and can support 16 gray 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 consistent, when the same gray scale is required to be displayed, the driving voltage and the pulse duration may be different due to the slight difference in the charge of the ink particles or the slight difference in the resistance of the filling liquid. Each ink screen needs to be manually measured to set the driving parameters in the lookup table before leaving the factory, but in an actual application scene, the screen projection interconnection of the reading terminal is mostly short-distance interconnection, for example, WIFI direct connection or bluetooth connection in the same area network environment, so that the difference between the ambient temperature of the reading terminal 100 and the ambient temperature of the far-end display device 200 can be ignored, and the far-end display device 200 can directly refresh the driving waveform display form obtained based on the temperature parameters detected by the temperature sensor 154 of the reading terminal 100 without 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 parameter with the minimum error to the remote display device 200 after completing the table lookup operation.
A first embodiment. The reading terminal 100 and the remote display device 200 are refreshed using the same driving parameters (i.e., the driving parameters of the reading terminal 100), and after the N-frame image is refreshed and displayed, the grayscale difference is accumulated to some extent, for example: when the plain text can display 10 to 20 frames, and the image is displayed 5 frames later, the reading terminal 100 and the remote display device 200 perform a screen clearing operation respectively in synchronization, return all the ink particles to the initial position, and then display the next frame of image.
A second embodiment. At the initial stage of establishing the remote screen-projection connection, the remote display device 200 transmits the mapping relationship between the grayscale and the driving waveform in its own lookup table (hereinafter, collectively referred to as "first lookup table") to the reading terminal 100, and stores it in the memory 106 in advance. When the screen is projected, the reading terminal 100 establishes a relative mapping relationship between the lookup table (hereinafter, referred to as "the second lookup table") and the first lookup table of the remote display device 200, that is, the difference between the driving parameters in the first lookup table and the second lookup table at the same temperature for the same gray level is determined based on the gray level, and the driving parameters to be transmitted are corrected according to the difference when the screen is projected.
A third embodiment. The remote display device 200 transmits the first look-up table mapping to the reading terminal 100 and is pre-stored in the memory 106. When the screen is projected, the reading terminal 100 reads the gray image from the memory 106, and then uses the first lookup table and the second lookup table to query the driving waveform parameters, wherein the driving waveform parameters queried by the second lookup table are used for displaying by the reading terminal 100 itself, and the driving waveform parameters queried by the first lookup table are sent to the remote display device 200 for use. When the two table look-up processes need to be performed sequentially, considering the network transmission delay, the first look-up table may be looked up first to obtain the driving waveform of the remote display device 200, and in the process of sending the driving waveform to the remote display device 200, the second look-up table may be looked up to obtain the waveform used by the reading terminal 100, so as to reduce the delay difference between the two synchronous displays.
Next, taking the color display screen as an example, the ink screen 134 displays a color picture by the color on the color filter 136. As previously mentioned, the data structure of the pixels of the image to be displayed is RGB 888. First, the processor 101 performs a quantization process on an image to be displayed to discard and retain a component value of one of red, green and blue pixels, and then converts the formed image into a grayscale image. The purpose of converting the gray scale image into the gray scale image is to be capable of adapting to the display of the ink screen 134, the color expression of the image to be displayed is realized by the color filter 136, and the ink screen 134 itself still follows the display mechanism of black and white particles, that is, the color image cannot be directly displayed by the ink screen 134 itself, but the display effect of the color filter 136 is affected by the depth of the gray scale, so that various colors are realized.
When the quantization processing is performed, the processor 101 reserves a component value of one of the red, green and blue pixels on the color filter 136 corresponding to a pixel of the image to be displayed, performs gray scale conversion on the image to be displayed according to the component value to 8-bit gray scale data, and converts the 8-bit gray scale data to 4-bit gray scale data.
In another implementation scenario, where the data structure of some color images is RGBA8888, with an 8-bit transparency value, processor 101 ignores the transparency value directly since the transparency is not reflected by ink screen 134 of this embodiment.
Then, the timing controller 108 outputs a driving waveform corresponding to the gray image to drive the ink panel 134 to display the gray of the rgb pixels, and the color filter 136 displays a color image according to the gray of the rgb pixels, thereby realizing a refresh display of the image to be displayed. The lookup and refresh methods are as described above and will not be described herein.
Fig. 7 is a diagram illustrating another embodiment of the present invention, which is a method 700 for projecting a screen to a remote display screen through a reading terminal. As shown in fig. 7, this embodiment includes the following steps:
in step 701, a grayscale calculation is performed on the image to be projected to convert the image into a grayscale image. The gray scale calculation from the screen to the black-and-white ink screen is performed by using a floating point method, an integer method, a shift method or an average value method; the gray scale calculation from screen projection to color ink screen is performed by a component processing. The detailed manner of converting into the gray-scale image has been described in the above embodiments, and is not described again.
In step 702, the grayscale image and the lookup table are read. Specifically, the converted grayscale image and the lookup table are taken.
In step 703, the driving waveform parameters of the grayscale image are output according to the temperature lookup table. In more detail, the lookup table includes a first lookup table of the remote display screen and a second lookup table of the reading terminal. The above embodiments provide three implementation schemes for outputting the driving waveform parameters of the gray scale image, and are not described again.
In step 704, the drive waveform parameters are sent to the remote display screen. And after the reading terminal finishes 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 display, which when executed by a processor performs the method of fig. 7.
It should also be appreciated that any module, unit, component, server, computer, terminal, or device executing instructions exemplified herein may include or otherwise have access to a computer-readable medium, such as a storage medium, computer storage medium, or data storage device (removable) and/or non-removable, such as a magnetic disk, optical disk, or 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, a module, or both. Any such computer readable storage media may be part of or accessible or connectable to a device. Any 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.
Through the foregoing description of the embodiments, those skilled in the art can understand that the reading terminal of the present invention does not invoke the system interface to capture the color image, but directly sends the driving waveform parameter, and for the remote display device, the ink screen can be directly driven to refresh according to the driving waveform parameter. The display frames of the reading terminal and the far-end display device are synchronized, so that the user experience is improved.
The foregoing detailed description of the embodiments of the present disclosure has been presented for purposes of illustration and description and is intended to be exemplary only and is not intended to be exhaustive or to limit the invention to the precise forms disclosed; meanwhile, for the person skilled in the art, based on the idea of the present disclosure, there may be variations in the specific embodiments and the application scope, and in summary, the present disclosure should not be construed as limiting the present disclosure.
Claims (10)
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 so as to convert the image to be projected 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; and
and the communication interface is used for sending the driving waveform parameters to the far-end display screen.
2. The reading terminal of claim 1, wherein the processor converts the image to be projected into 8-bit grayscale data using a floating point method, an integer method, a shift method, or an average value method.
3. The reading terminal of claim 1, wherein the processor performs a quantization process on the image to be projected to convert the image into the gray image, and the gray of the red, green and blue pixels corresponding to the driving waveform parameter is generated by the timing controller.
4. The reading terminal of claim 1, wherein the look-up table comprises a first look-up table of the remote display.
5. A method for projecting a screen to a remote display screen through a reading terminal comprises the following steps:
carrying out gray level calculation on an image to be projected so as to convert the image to be projected into a gray level image;
reading the gray level image and a lookup table;
searching the lookup table according to the temperature, and outputting the driving waveform parameters of the gray level image; and
and sending the driving waveform parameters to the far-end display screen.
6. The method of claim 5, 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.
7. The method of claim 5, wherein the drive waveform parameters comprise: information of at least one of driving voltage, pulse frequency and pulse duration of each pixel point.
8. The method of claim 5, wherein the gray scale calculating step comprises:
performing quantization processing on the image to be projected to convert the image to be projected into the gray image;
wherein the driving waveform parameter corresponds to the gray scale of the red, green and blue pixels.
9. The method of claim 5, wherein the lookup table comprises a first lookup table of the remote display screen.
10. A computer readable storage medium having stored thereon computer program code for projecting a screen to a remote display screen by a reading terminal, which computer program code, when executed by a processor, performs the method according to any of claims 5 to 9.
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