CN115171622A - Method for processing synchronous signal of liquid crystal display - Google Patents
Method for processing synchronous signal of liquid crystal display Download PDFInfo
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- CN115171622A CN115171622A CN202210931822.6A CN202210931822A CN115171622A CN 115171622 A CN115171622 A CN 115171622A CN 202210931822 A CN202210931822 A CN 202210931822A CN 115171622 A CN115171622 A CN 115171622A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 112
- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 238000000605 extraction Methods 0.000 claims abstract description 12
- 238000001914 filtration Methods 0.000 claims description 25
- 230000005540 biological transmission Effects 0.000 claims description 8
- 238000005192 partition Methods 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 5
- 230000000750 progressive effect Effects 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000005684 electric field Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Abstract
The invention discloses a method for processing synchronous signals of a liquid crystal display, which comprises the following steps: s1: reading the synchronous signal of the liquid crystal display in real time through a display card display information extraction circuit of the liquid crystal display; s2: processing the extracted LCD synchronous signal and transmitting by using a long line; s3: converting the synchronous signal of the liquid crystal display screen transmitted by the long line by using an analog signal/digital signal conversion module on the liquid crystal display to obtain display information; s4: a display screen driving board on the liquid crystal display receives display information and converts the display information by using an analog VGA digital/VGA signal conversion module; s5: and processing the converted display information by using a display card characteristic socket on the liquid crystal display. The invention can simplify the processing steps of the synchronous signals of the liquid crystal display, shorten the time of processing the synchronous signals by the liquid crystal display screen, further enable the liquid crystal display to quickly respond to the synchronous signals, has good use effect and is beneficial to popularization and use.
Description
Technical Field
The invention relates to the technical field of liquid crystal displays, in particular to a method for processing synchronous signals of a liquid crystal display.
Background
Liquid crystal displays, which are flat, ultra-thin display devices, consist of a certain number of color or black and white pixels placed in front of a light source or a reflective surface. The liquid crystal display has low power consumption, is favored by engineers and is suitable for electronic equipment using a battery, and the main principle of the liquid crystal display is that a current stimulates liquid crystal molecules to generate points, lines and surfaces to be matched with a back lamp tube to form a picture, and the working principle of the liquid crystal display is as follows: a liquid crystal is a special substance between a solid and a liquid, which is an organic compound that is normally in a liquid state but has a molecular arrangement as well as a solid crystal, and is therefore called a liquid crystal, and another special property thereof is that if an electric field is applied to the liquid crystal, its molecular arrangement is changed, and if a polarizer is attached thereto, it has an effect of blocking the passage of light (light can smoothly pass therethrough without applying an electric field), and if a color filter is attached thereto, the amount of light transmission of a certain color can be changed by changing the magnitude of voltage applied to the liquid crystal, and it can be said that changing the voltage across the liquid crystal can change its transmittance (although in practice, it must be attached to a polarizing plate).
The existing liquid crystal display screen synchronizing signal processing process is complicated, and the processing time of the liquid crystal display screen is prolonged, so that a liquid crystal display screen synchronizing signal processing method is provided for solving the problems.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a method for processing a synchronous signal of a liquid crystal display.
The invention provides a method for processing synchronous signals of a liquid crystal display, which is characterized by comprising the following steps of:
s1: reading a synchronous signal of the liquid crystal display in real time through a display card display information extraction circuit of the liquid crystal display;
s2: processing the extracted LCD synchronous signals and transmitting the signals by using a long line;
s3: converting the liquid crystal display screen synchronous signals transmitted by the long line by using an analog signal/digital signal conversion module on the liquid crystal display to obtain display information;
s4: a display screen driving board on the liquid crystal display receives display information and converts the display information by using an analog VGA digital/VGA signal conversion module;
s5: processing the converted display information by using a display card characteristic socket on the liquid crystal display to obtain the color characteristic of the display information;
s6: processing display information by using a DVI parallel/serial conversion module on the liquid crystal display to obtain a final display signal;
s7: a display screen driving board on the liquid crystal display distributes display signals to pixel points corresponding to the liquid crystal lattice screen and drives a display screen of the liquid crystal display to display the display signals;
preferably, in S1, when the synchronization signal of the liquid crystal display is extracted, the line synchronization and the frame synchronization are maintained, and the signal is processed by using a demodulator and a filter before the extraction, where the working process of the demodulator is a process of recovering a message from a modulated signal carrying the message, in various information transmission or processing systems, a sending end modulates a carrier with the message to be transmitted to generate a signal carrying the message, and filtering (Wave filtering) is an operation of filtering a specific band frequency in the signal and is an important measure for suppressing and preventing interference, and filtering is classified into classical filtering and modern filtering, and filtering is an operation of filtering a specific band frequency in the signal and is an important measure for suppressing and preventing interference, and is a probability theory and a method for estimating another random process related to the specific band frequency according to a result of observing a certain random process.
Preferably, in S1, the lcd is provided with clock pixels, and when reading the lcd synchronization signal, the clock pixels are all performed under the action and control of the pixel clock, and the lcd synchronization signal is read only when a falling edge or a rising edge of the pixel clock arrives, so as to ensure the accuracy of reading, in the lcd panel, the pixel clock is a very important clock signal, the frequency of the pixel clock signal is related to the operating mode of the lcd panel, the higher the resolution of the lcd panel is, the higher the frequency of the pixel clock signal is, the same number of pixel clocks as the number of pixels in one line of the lcd panel is, and for the lcd panel with 1024 pixels in one line, the number of pixel clocks in one line is also 1024.
Preferably, in S2, the display card display information extraction circuit of the liquid crystal display completes the steps of selecting, storing, reading, and distributing the synchronization signal of the liquid crystal display, and the long line is a conductive line capable of transmitting data.
Preferably, in S3, the lcd synchronization signal transmitted by the long line reaches the analog signal/digital signal conversion module on the lcd for conversion, so as to obtain the display information capable of being recognized by the lcd.
Preferably, in S4, the converted display information is transmitted to an analog VGA digital/VGA signal conversion module of the liquid crystal display, and a DVI serial/parallel conversion module is further required to process the display information at the analog VGA digital/VGA signal conversion module of the liquid crystal display.
Preferably, in S5, when a color is required to be displayed, a color number is output from the video memory, the color number is actually suitable for selecting the palette register, the selected palette register generates an eight-bit index address for selecting the color register, the total number of the color registers is 256, each register is composed of 18, the color register is sent to the analog detector to realize the scanning of the video card, the liquid crystal display has the characteristic that when the liquid crystal display works in the display mode 18, namely in the sixteen-color mode, the lower four bits of the eight-bit index address output by the palette register are blue, green, red and luminance signals, and the video card feature socket can be directly completed.
Preferably, in S5, the graphics card feature socket sends the display information to the color register inverse simulation monitor on one hand, and can output the display information to the outside on the other hand.
Preferably, in S6, after the display information is converted by the DVI parallel/serial conversion module, the final display signal includes a pixel clock, a field synchronization signal and a line synchronization signal for subsequent display, the line synchronization signal is used to select an effective line information interval on the liquid crystal panel, the field synchronization signal is used to select an effective field signal interval on the liquid crystal panel, and the effective signal interval on the liquid crystal panel can be selected due to the combined action of the line synchronization signal and the field synchronization signal.
Preferably, in S7, the display screen of the liquid crystal display receives the display signal and correspondingly displays the display signal, and the liquid crystal display displays the display screen in a dynamic progressive scanning manner, because the data of each partition is transmitted simultaneously, the data transmission allocation and the liquid crystal driving of each partition are consistent.
The invention has the beneficial effects that:
1. the invention can simplify the processing steps of the synchronous signals of the liquid crystal display, shorten the time for processing the synchronous signals by the liquid crystal display screen, further enable the liquid crystal display to quickly respond to the synchronous signals, has good use effect and is beneficial to popularization and use;
2. the reading of the synchronizing signals of the liquid crystal display is carried out under the action and the control of the pixel clock, the synchronizing signals of the liquid crystal display are read only when the falling edge or the rising edge of the pixel clock arrives, the reading accuracy of the synchronizing signals can be improved, in the liquid crystal panel, the pixel clock is an important clock signal, the frequency of the pixel clock signal is related to the working mode of the liquid crystal panel, the higher the resolution of the liquid crystal panel is, the higher the frequency of the pixel clock signal is, and the number of the pixel clocks is the same as the number of pixels in one line of the liquid crystal panel.
3. When the liquid crystal display works in the display mode 18, namely sixteen color modes, the low four bits of the eight-bit index address output by the palette register are the characteristics of blue, green, red and brightness signals, and the display card characteristic socket can be directly finished.
Drawings
Fig. 1 is a block diagram of a method for processing a synchronization signal of a liquid crystal display according to the present invention.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Examples
Referring to fig. 1, the present embodiment provides a method for processing a synchronization signal of a liquid crystal display, including the following steps:
s1: reading the synchronous signal of the liquid crystal display in real time through a display card display information extraction circuit of the liquid crystal display;
s2: processing the extracted LCD synchronous signal and transmitting by using a long line;
s3: converting the liquid crystal display screen synchronous signals transmitted by the long line by using an analog signal/digital signal conversion module on the liquid crystal display to obtain display information;
s4: a display screen driving board on the liquid crystal display receives display information and converts the display information by using an analog VGA digital/VGA signal conversion module;
s5: processing the converted display information by using a display card characteristic socket on the liquid crystal display to obtain the color characteristic of the display information;
s6: processing display information by using a DVI parallel/serial conversion module on the liquid crystal display to obtain a final display signal;
s7: a display screen driving board on the liquid crystal display distributes display signals to pixel points corresponding to the liquid crystal lattice screen and drives a display screen of the liquid crystal display to display the display signals;
in this embodiment, in S1, attention is paid to maintaining line synchronization and frame synchronization when extracting a synchronization signal of a liquid crystal display, a demodulator and a filter are used for processing before extracting, a working process of the demodulator is a process of recovering a message from a modulated signal carrying the message, in various information transmission or processing systems, a transmitting end modulates a carrier with the message to be transmitted to generate a signal carrying the message, filtering (Wave filtering) is an operation of filtering a specific band frequency in the signal and is an important measure for suppressing and preventing interference, filtering is classified into classical filtering and modern filtering, filtering is an operation of filtering a specific band frequency in the signal and is an important measure for suppressing and preventing interference, a probability theory and a method for estimating another random process related to the random process according to a result of observing the random process are provided, in S1, the LCD is provided with clock pixels, when reading the LCD synchronous signal, the clock pixels are all carried out under the action and the control of a pixel clock, the LCD synchronous signal is read only when the falling edge or the rising edge of the pixel clock arrives to ensure the reading accuracy, in the LCD panel, the pixel clock is an important clock signal, the frequency of the pixel clock signal is related to the working mode of the LCD panel, the higher the resolution of the LCD panel is, the higher the frequency of the pixel clock signal is, the number of the pixel clock is the same as the number of the pixels in one line of the LCD panel, for the LCD panel with 1024 pixels, the number of the pixel clock in one line is also 1024, in S2, the display information extraction circuit of the LCD card finishes the selection of the LCD synchronous signal, in S3, the synchronous signal of the liquid crystal display transmitted by the long line reaches an analog signal/digital signal conversion module on the liquid crystal display to be converted to obtain display information which can be identified by the liquid crystal display, in S4, the converted display information is transmitted to an analog VGA digital/VGA signal conversion module of the liquid crystal display, the display information is processed by using a DVI serial/parallel conversion module at the analog VGA digital/VGA signal conversion module of the liquid crystal display, in S5, when color is required to be displayed, a color number is firstly output by a video storage, the color number is actually suitable for selecting a palette register, the selected palette register generates an eight-bit index address for selecting the color register, the color registers have 256 numbers, each register is composed of 18 and is sent to an analog detector to realize a scanning display card, the liquid crystal display has the characteristic that when the liquid crystal display works in a display mode 18, namely in a sixteen-color mode, four bits of the lower color index address are blue, green, red and red, the characteristic that a socket signal and a display signal can be directly output to an effective display field display signal in a field display panel, and the last display signal of the LCD panel can be directly transmitted by a field selection module, and the LCD panel is directly transmitted by a field selection module, due to the combined action of the line synchronizing signal and the field synchronizing signal, an effective signal interval on the liquid crystal panel can be selected, in S7, a display screen of the liquid crystal display receives the display signal and correspondingly displays the display signal, the liquid crystal display adopts a dynamic line-by-line scanning mode to display the display screen, and data transmission distribution and liquid crystal driving of each partition are consistent because data of each partition are transmitted simultaneously.
In the embodiment, during processing, firstly, a demodulator and a filter are used for demodulating and filtering a synchronous signal of the liquid crystal display, the message is recovered from the modulated signal carrying the message, the specific waveband frequency in the synchronous signal of the liquid crystal display is filtered, then a display card display information extraction circuit of the liquid crystal display reads the synchronous signal of the liquid crystal display in real time, line synchronization and frame synchronization are kept during extraction, the extraction is carried out under the action and the control of a pixel clock, the synchronous signal of the liquid crystal display is read only when a falling edge or a rising edge of the pixel clock arrives to ensure the reading accuracy, the extracted synchronous signal of the liquid crystal display is selected, stored, read and distributed, then is transmitted to an analog signal/digital signal conversion module on the liquid crystal display by using a long line to carry out conversion of the analog signal and the digital signal, display information which can be identified by the liquid crystal display is obtained, the display information is transmitted to a display screen, the conversion is carried out by using an analog VGA digital/VGA signal conversion module, four-bit information processing is carried out by using a serial/parallel conversion module after the conversion, the display information is transmitted to a display information transmission board, when the display information is transmitted to a display board, when the color display mode is a low-color display mode, when the display mode is a display mode is not used, the display mode is a display mode, when the display mode is a display mode, namely a display mode is a display mode, a display mode is obtained, the method comprises the steps of outputting a color number by a video storage, wherein the color number is actually suitable for selecting a palette register, the selected palette register can generate an eight-bit index address for selecting the color register, the number of the color registers is 256, each register consists of 18, the color number is sent to an analog detector to realize scanning of a display card, a DVI parallel/serial conversion module on a liquid crystal display is used for processing display information to obtain a final display signal, the final display signal comprises a pixel clock, a field synchronizing signal and a line synchronizing signal, and due to later display, the display signal can be received on a display screen of the liquid crystal display, and the liquid crystal display can display the display screen in a dynamic line-by-line scanning mode.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (10)
1. A method for processing synchronous signals of a liquid crystal display is characterized by comprising the following steps:
s1: reading the synchronous signal of the liquid crystal display in real time through a display card display information extraction circuit of the liquid crystal display;
s2: processing the extracted LCD synchronous signal and transmitting by using a long line;
s3: converting the liquid crystal display screen synchronous signals transmitted by the long line by using an analog signal/digital signal conversion module on the liquid crystal display to obtain display information;
s4: a display screen driving board on the liquid crystal display receives display information and converts the display information by using an analog VGA digital/VGA signal conversion module;
s5: processing the converted display information by using a display card characteristic socket on the liquid crystal display to obtain the color characteristic of the display information;
s6: processing display information by using a DVI parallel/serial conversion module on the liquid crystal display to obtain a final display signal;
s7: and a display screen driving board on the liquid crystal display distributes the display signals to the pixel points corresponding to the liquid crystal lattice screen and drives the display screen of the liquid crystal display to display the display signals.
2. The method as claimed in claim 1, wherein in S1, the extracted synchronization signal of the lcd panel in S1 is processed by a demodulator and a filter before extraction, the demodulator is used to recover the message from the modulated signal carrying the message, the transmitting end modulates the carrier with the message to be transmitted in various information transmission or processing systems to generate a signal carrying the message, the filtering (Wave filtering) is an operation of filtering out a specific band of frequencies in the signal, which is an important measure for suppressing and preventing interference, the filtering is divided into classical filtering and modern filtering, the filtering is an operation of filtering out a specific band of frequencies in the signal, which is an important measure for suppressing and preventing interference, and is a probability theory and method for estimating another random process related to a certain random process according to the result of observing the random process.
3. The method of claim 1, wherein in S1, the lcd is provided with clock pixels, and when reading the lcd synchronization signals, the reading is performed under the action and control of a pixel clock, and the lcd synchronization signals are read only when a falling edge or a rising edge of the pixel clock arrives, so as to ensure the accuracy of the reading.
4. The method of claim 1, wherein in step S2, the graphic card display information extraction circuit of the lcd performs the steps of selecting, storing, reading and distributing the lcd synchronization signals, and the long lines are conductive lines capable of transmitting data.
5. The method as claimed in claim 1, wherein in S3, the lcd synchronization signal transmitted by the long line reaches an analog/digital signal conversion module of the lcd for conversion, so as to obtain display information recognizable by the lcd.
6. The method of claim 1, wherein in S4, the converted display information is transmitted to an analog VGA digital/VGA signal conversion module of the lcd, and a DVI serial/parallel conversion module is further required to process the display information at the analog VGA digital/VGA signal conversion module of the lcd.
7. The method of claim 1, wherein in step S5, when a color is required to be displayed, the video memory outputs a color number, the color number is actually suitable for selecting the color palette register, the selected color palette register generates an eight-bit index address for selecting the color register, the color registers have 256 numbers, each register is composed of 18 registers, the color registers are sent to the analog detector to realize the scanning display card, the lcd has a characteristic that when the lcd operates in the display mode 18, i.e., the sixteen-color mode, the lower four bits of the eight-bit index address output by the color palette register are blue, green, red and luminance signals, and the display card feature socket can be directly implemented.
8. The method as claimed in claim 1, wherein in S5, the graphic card feature socket transmits the display information to the color register inverse simulation monitor, and outputs the display information to the outside, and the graphic card feature socket is only present.
9. The method of claim 1, wherein in S6, after the display information is converted by the DVI parallel/serial conversion module, the final display signal includes a pixel clock, a field sync signal and a line sync signal for subsequent display, the line sync signal is used to select an effective line information interval on the liquid crystal panel, the field sync signal is used to select an effective field signal interval on the liquid crystal panel, and the effective signal interval on the liquid crystal panel can be selected due to the combined action of the line sync signal and the field sync signal.
10. The method according to claim 1, wherein in S7, the lcd receives the display signal on the display screen, and correspondingly displays the display signal, and the lcd displays the display signal by using a dynamic progressive scanning method, and since the partition data are transmitted simultaneously, the data transmission allocation and the liquid crystal driving of each partition are consistent.
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| CN202210931822.6A CN115171622A (en) | 2022-08-04 | 2022-08-04 | Method for processing synchronous signal of liquid crystal display |
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| CN202210931822.6A CN115171622A (en) | 2022-08-04 | 2022-08-04 | Method for processing synchronous signal of liquid crystal display |
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