CN109473074B - Method for establishing display data transmission of liquid crystal display television - Google Patents
Method for establishing display data transmission of liquid crystal display television Download PDFInfo
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- CN109473074B CN109473074B CN201811458163.9A CN201811458163A CN109473074B CN 109473074 B CN109473074 B CN 109473074B CN 201811458163 A CN201811458163 A CN 201811458163A CN 109473074 B CN109473074 B CN 109473074B
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- television
- display data
- liquid crystal
- data transmission
- signal
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/26—Special purpose or proprietary protocols or architectures
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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
- G09G2370/00—Aspects of data communication
Abstract
The invention relates to the field of liquid crystal display television display, discloses a method for establishing liquid crystal display television display data transmission, solves the problem that the high reliability requirement of large-data-volume display data transmission of a liquid crystal display television cannot be met by adopting a single handshake mode in the traditional technology, and ensures the transmission correctness of display data. In the invention, the TX end and the RX end of the liquid crystal television are established by adopting a two-way handshake mode, a certain time interval is arranged between the two-way handshake, and the transmission process of the television display data can not influence the subjective picture display by defining the time sequence of the LOCK signal and the television backlight signal.
Description
Technical Field
The invention relates to the field of liquid crystal display television display, in particular to a method for establishing display data transmission of a liquid crystal display television.
Background
The resolution of the liquid crystal television is higher and higher nowadays, the 4K resolution has become the mainstream of the market, and the development is going to the 8K resolution. The larger data volume of the display information leads to higher and higher data transmission rates, which reach the GB/S level. The format of the transmission data from the movement to the screen is also developed from the original LVDS/MINILVDS to a new data format such as P2P, and the data transmitted by the new data format not only includes display data, but also includes data such as control commands and drive parameter settings.
Under the application requirements of larger data volume and more complex format, the data transmission has high requirements on various time sequence control and transmission environments of the system, so that the application of the P2P data format protocol to the LOCK signal is increased to ensure that the data from the movement to the screen can be correctly transmitted. The LOCK signal is a data transmission state identification signal, the high/low levels of the signal correspond to different data transmission states, and the application mode in the P2P protocol is as shown in the following table:
based on the P2P protocol, the currently widely adopted data transmission establishment flow is shown in fig. 1, and includes the following steps:
step 1: when a television is started, a TX (transmitting) end sets a LOCK signal high;
step 2: the TX end sends a handshake signal, and meanwhile, the RX (receiving) end pulls down a LOCK signal;
and step 3: after the handshake process is completed, the RX side sets the LOCK signal high, and the TX side transmits normal display data.
In the process, the level change state of the LOCK signal is shown in fig. 2, and at a node (i), when the television is started, the LOCK signal is set high by a TX end; at the node II, when the TX end sends a handshake signal, the LOCK signal is pulled low by the RX end; node c, when the handshake is completed, the LOCK signal is set high by the RX end. In the above description, the TX end is a core end of the lcd tv, and the RX end is a screen end of the lcd tv.
It can be seen that the P2P protocol currently uses a single handshake to establish the display data transmission. In practical application, the matching states of the movement and the screen are many, so that the unmatched matching states are easy to occur. If the time sequence design of the startup data is unreasonable or the environment of the whole television system is interfered, errors of data transmission are easily caused, and abnormal display problems such as screen splash, flash points and the like of the liquid crystal display screen occur. The single handshake mode adopted in the traditional technology cannot meet the high reliability requirement of the large data volume display data transmission of the liquid crystal television.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the method for establishing the transmission of the display data of the liquid crystal display television is provided, solves the problem that the high reliability requirement of the transmission of the large-data-volume display data of the liquid crystal display television cannot be met by adopting a single handshake mode in the traditional technology, and ensures the transmission correctness of the display data.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the method for establishing the display data transmission of the liquid crystal television is applied to the liquid crystal television which adopts the P2P protocol to transmit the display data, and comprises the following steps: the method comprises the steps that data transmission is established at a TX end and an RX end of the liquid crystal display television in a two-way handshaking mode, a certain time interval exists between the two handshaking modes, and the transmission process of television display data is guaranteed not to influence subjective picture display by defining the time sequence of a LOCK signal and a television backlight signal.
As a further optimization, the method specifically comprises the following steps:
a. when a television is started, the TX end sets a LOCK signal high;
the TX end sends a first handshake signal, and meanwhile, the RX end pulls down a LOCK signal;
c. after the first handshake process is completed, the RX end sets the LOCK signal high, and meanwhile, the TX end sends normal display data;
d. after waiting for T1 time, the TX end pulls down the LOCK signal, stops the transmission of display data and sends out a second handshake signal;
e. after the second handshake process is completed, the LOCK signal is set high by the RX end, and the TX end sends normal display data again;
f. after a duration of T2, the television turns on the backlight signal.
As a further optimization, in step d, the T1 time satisfies:
20ms<T1<100ms。
as a further optimization, in step f, the T2 time satisfies:
T2>20ms。
the invention has the beneficial effects that:
aiming at the P2P data format adopted by the LCD TV display data transmission, the invention adopts a two-time handshaking mode to establish the data transmission, and defines the corresponding realization method, defines the key time sequence requirement, and avoids the problem that the LCD TV is easy to cause display data transmission error between the machine core and the screen.
Therefore, the scheme of the invention can greatly improve the transmission reliability of the display data and meet the user experience in the application of the liquid crystal television with larger display data volume transmission.
Drawings
FIG. 1 is a flow chart illustrating a conventional display data transmission setup procedure;
FIG. 2 is a diagram illustrating a state of a LOCK signal level change during a setup process of data transmission according to a conventional technique;
FIG. 3 is a flow chart of the display data transmission setup in the present invention;
FIG. 4 is a timing diagram of the change of the LOCK signal level and the backlight signal during the setup process of the display data transmission according to the present invention.
Detailed Description
The invention aims to provide a method for establishing display data transmission of a liquid crystal television, which solves the problem that the high reliability requirement of large-data-volume display data transmission of the liquid crystal television cannot be met by adopting a single handshake mode in the traditional technology, and ensures the transmission correctness of display data.
The verification idea of the invention is:
(1) redefining a signal handshake mode of a TX end (a machine core end) and an RX end (a screen end) of display data transmission, and changing a one-time handshake mode into two times, namely: increasing a reset state of one data transmission;
(2) defining the time interval requirement of two handshaking signals, and ensuring the validity of the data transmission reset function;
(3) the time sequence requirements of the Lock signal and the television backlight signal are determined, and the transmission process of the television display data is ensured not to influence subjective display.
The method for establishing the display data transmission of the liquid crystal television is shown in fig. 3 and comprises the following steps:
a. when a television is started, the TX end sets a LOCK signal high;
the TX end sends a first handshake signal, and meanwhile, the RX end pulls down a LOCK signal;
c. after the first handshake process is completed, the RX end sets the LOCK signal high, and meanwhile, the TX end sends normal display data;
d. after waiting for T1 time, the TX end pulls down the LOCK signal, stops the transmission of display data and sends out a second handshake signal;
e. after the second handshake process is completed, the LOCK signal is set high by the RX end, and the TX end sends normal display data again;
f. after a duration of T2, the television turns on the backlight signal.
The LOCK signal level change during the display data transmission setup process of the above scheme is shown in fig. 4:
when the television is started, a LOCK signal is set to be high by a TX end;
at the node II, when the TX end sends a first handshake signal, the LOCK signal is pulled low by the RX end;
when the first handshake is completed, the LOCK signal is set high by the RX end at the node III;
after waiting for a period of time (T1), the TX end pulls down the LOCK signal, stops transmission of display data, and sends a second handshake signal;
at node, the second handshake process between TX and RX is completed, LOCK signal is set high by RX, and TX sends normal display data again.
In fig. 4, the two-handshake state time interval between the TX end and the RX end is T1, and the requirement for T1 is defined as follows:
(1) the refresh rate of the LCD TV screen is generally 50/60Hz, i.e. the refresh cycle is generally 20ms/16.6ms, in order to ensure the second handshake state of data transmission to be effective and achieve the purpose of data reset, T1 needs to be greater than the single refresh cycle, i.e. T1 is greater than 20 ms;
(2) the too long time of T1 will affect the turn-on time of the LCD TV, so the scheme requires T1<100 ms.
Therefore, the T1 time satisfies: 20ms < T1<100 ms.
In addition, when node (c), the display data transmission completes the second handshake process, and the TX end starts to transmit normal display data.
If the backlight signal is turned on before, due to the secondary handshake of the display data, the picture abnormity can be seen on the screen; if the data sent at this time is just not complete frame data and the backlight signal is turned on at this time, an abnormal picture can be seen on the screen due to the incompleteness of the display data. To ensure that the transmission setup process of the tv display data does not affect the subjective picture display, the requirement of T2 in fig. 4 is defined as follows: t2>20 ms.
Claims (3)
1. The method for establishing the display data transmission of the liquid crystal television is applied to the liquid crystal television which adopts the P2P protocol to transmit the display data and is characterized in that,
the method comprises the following steps: establishing data transmission at a TX end and an RX end of the liquid crystal display television in a two-way handshake mode, wherein a certain time interval exists between the two handshakes, and the transmission process of television display data is ensured not to influence subjective picture display by defining the time sequence of a LOCK signal and a television backlight signal;
the method specifically comprises the following steps:
a. when a television is started, the TX end sets a LOCK signal high;
the TX end sends a first handshake signal, and meanwhile, the RX end pulls down a LOCK signal;
c. after the first handshake process is completed, the RX end sets the LOCK signal high, and meanwhile, the TX end sends normal display data;
d. after waiting for T1 time, the TX end pulls down the LOCK signal, stops the transmission of display data and sends out a second handshake signal;
e. after the second handshake process is completed, the LOCK signal is set high by the RX end, and the TX end sends normal display data again;
f. after a duration of T2, the television turns on the backlight signal.
2. The method for establishing LCD TV display data transmission according to claim 1,
in step d, the T1 time satisfies the following conditions:
20ms<T1<100ms。
3. the method for establishing LCD TV display data transmission according to claim 1,
in step f, the time T2 satisfies the following conditions:
T2>20ms。
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| CN109473074B true CN109473074B (en) | 2020-10-30 |
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