CN101448069A - System and method for copying setup information of TV - Google Patents
System and method for copying setup information of TV Download PDFInfo
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- CN101448069A CN101448069A CNA2007101874794A CN200710187479A CN101448069A CN 101448069 A CN101448069 A CN 101448069A CN A2007101874794 A CNA2007101874794 A CN A2007101874794A CN 200710187479 A CN200710187479 A CN 200710187479A CN 101448069 A CN101448069 A CN 101448069A
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Abstract
The invention discloses a system and a method for copying setup information of a TV, and solves a problem of copying the information that a user of the TV can set at low cost. The copying system comprises the TV and a copier, and the TV comprises a TV control unit, a TV storage unit and a TV I/O interface; the TV storage unit stores the user set information, and the TV I/O interface comprises an I<2>C bus port which is connected to the TV control unit; the copier comprises a copier storage unit and a copier I/O interface; the TV I/O interface is connected with the copier I/O interface by the I<2>C bus, and the TV control unit is used for controlling data transmission direction of the I<2>C bus, reading the user set information in the TV storage unit and writing the information in the copier storage unit, or reading the user set information in the copier storage unit and writing the information in the TV storage unit. The system and the method can be applied to TV setup in hotels or final TV tests in factories.
Description
Technical field
The present invention relates to field of television, relate in particular to a kind of system and method for copying setup information of TV.
Background technology
In the service of hotel, television set is the requisite configuration in guest room, in order to provide better service to the guest, the administrative staff in hotel can be provided with television set in advance, such as white balance data of television channel layout, opening sound volume, max volume, startup channel and signal source etc. are provided with etc.These information are stored in the television set internal storage unit usually, for example among the EEPROM (Electrically ErasableProgrammable Read-Only Memory, electricallyerasable ROM (EEROM)).Generally speaking, be with remote controller every television set to be provided with one by one to the setting of these information by the hotel management personnel, this mode not only workload is huge, and makes mistakes easily.
In the invention disclosed, disclosed the television receiver set information duplicating system, this type of invention mainly is divided into two kinds according to the data communication mode: a kind of is the mode that adopts wireless telecommunications (mainly being infrared), and another is the mode that adopts wired connection.But in this type of invention, cloning machine mostly needs the independent current source power supply in the dubbing system, and the other control module of needs realizes the read-write operation to configuration information, these factors cause system cost than higher, implement more complicated, and the line between television set and the cloning machine is also very complicated.
Known application number is 200610042289.9, and (open day is July 19 in 2006, publication number is CN1805502A) Chinese invention patent, a kind of cloning process and clone's device of television channel are disclosed, in this scheme, television set comprises television set control unit, television set memory cell and television set I/O interface, store information-setting by user in the television set memory cell, television set I/O interface is connected to the television set control unit by the I2C bus; Clone's device comprises external memory unit, clone's device I/O interface, clone's device I/O interface is connected to copier storage unit by the I2C bus, television set I/O interface is connected by the I2C bus with copier I/O interface, like this, copier storage unit is connected by the I2C bus with the control unit of television set, in addition, the power supply of clone's device is powered by independent current source.This cloning process comprises the master processor processes by television set inside, the channel information in the eeprom memory in the television set is transplanted in the external memory storage, and the channel information in the external memory storage is transplanted to the process in the eeprom memory in the television set.This scheme only is used to duplicate TV channel information, does not solve other information that can be provided with the user, such as the problem of duplicating of the white balance data of channel information, signal source, information volume, max volume information, contrast information, monochrome information.
Summary of the invention
An aspect of of the present present invention, a kind of system of copying setup information of TV is provided, not only cost is low, and can realize duplicating to channel information, and user's other information that can be provided with, for example the white balance data of channel information, signal source, information volume, max volume information, contrast information, monochrome information duplicates.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The system of copying setup information of TV of the present invention, comprise television set and reproducer, television set comprises television set control unit, television set memory cell and television set I/O interface, store information-setting by user in the television set memory cell, television set I/O interface comprises the bus port that is connected to the television set control unit; Reproducer comprises copier storage unit and copier I/O interface; Copier I/O interface comprises the bus port that is connected to copier storage unit, television set I/O interface is connected by bus with copier I/O interface, the transfer of data that the television set control unit is used for control bus flows to, read the information-setting by user in the television set memory cell, and be written in the copier storage unit; Perhaps read the information-setting by user in the copier storage unit, and be written in the television set memory cell; Wherein information-setting by user comprises white balance data, information volume, max volume information, contrast information, the monochrome information of channel information, signal source.
Because the information-setting by user of television set is stored in the television set internal storage unit, information-setting by user comprises white balance data, information volume, max volume information, contrast information, the monochrome information of channel information, signal source, so control by the television set control unit, read the information-setting by user in the television set memory cell, and be written in the copier storage unit; Perhaps read the information-setting by user in the copier storage unit, and be written in the television set memory cell, the configuration information of a television set can be written in the reproducer, then the configuration information in the reproducer is written in other television set, thereby but has realized duplicating of user's configuration information between the television set.
Another aspect of the present invention, a kind of method of copying setup information of TV is provided, not only cost is low, and can realize duplicating to channel information, and user's other information that can be provided with, for example the white balance data of channel information, signal source, information volume, max volume information, contrast information, monochrome information duplicates.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The method of copying setup information of TV of the present invention, television set comprise the television set memory cell that is used to store information-setting by user, and this method comprises:
Step (1) is connected by bus a control unit of having established the television set of information-setting by user with the memory cell of reproducer;
Step (2) has been established the control unit response user instruction of the television set of information-setting by user, reads the information-setting by user in the memory cell of the television set of establishing information-setting by user, and is written in the memory cell of reproducer;
Step (3), the control unit that disconnects the television set established information-setting by user is connected with the memory cell of reproducer, and the control unit that the memory cell of reproducer is not established the television set of information-setting by user by bus and another is connected;
Step (4) is not established the control unit response user instruction of the television set of information-setting by user, and read the information-setting by user in the memory cell of reproducer, and be written in the memory cell of the television set of not establishing information-setting by user,
Wherein, information-setting by user comprises white balance data, information volume, max volume information, contrast information, the monochrome information of channel information, signal source.
Because the information-setting by user of television set is stored in the television set internal storage unit, information-setting by user comprises white balance data, information volume, max volume information, contrast information, the monochrome information of channel information, signal source, so control by the television set control unit, read the information-setting by user in the television set memory cell, and be written in the copier storage unit; Perhaps read the information-setting by user in the copier storage unit, and be written in the television set memory cell, the configuration information of a television set can be written in the reproducer, then the configuration information in the reproducer is written in other television set, thereby but has realized duplicating of user's configuration information between the television set.In addition, in the system of copying setup information of TV, control I
2The controller of C data flow uses original primary processor in the television set, and not needing increases other controller, thereby has reduced cost.
Description of drawings
Fig. 1 is the block schematic diagram of the embodiment of the system of copying setup information of TV of the present invention;
Fig. 2 is the OSD interface of the embodiment of the system of copying setup information of TV of the present invention;
Fig. 3 is the flow chart of the embodiment of the method for copying setup information of TV of the present invention.
Embodiment
The invention provides a kind of system and method for copying setup information of TV, the present invention is described in detail below in conjunction with drawings and Examples.
The system of copying setup information of TV as shown in Figure 1, comprise television set 102 and transmit the reproducer 104 of data with television set, television set 102 comprises following components: power unit 202, control unit 204 is (in the present embodiment, control unit is a primary processor), memory cell 206 is (in the present embodiment, memory cell is EEPROM), display module 208, SDRAM (Synchronous DRAM, synchronous DRAM) 210, video processor 212, DDR (Double Date Rate SDRAM, ddr sdram) 214, and detecting unit 214, comparing unit 216, television set I/O interface etc.Television set control unit 204 passes through I with television set memory cell 206
2C bus or parallel I/O or SPI buses such as (peripheral serial line interfaces) connects.The I/O interface of television set can be VGA (Video GraphicsArray, Video Graphics Array) interface or SCART (the normal video interface in Europe, Syndicat desConstructeursd ' Appareils Radior é cepteurs et T é l é viseurs) interface or S terminal (separate type image terminal, Separate Video), be example with the S terminal in the present embodiment, television set and original I/O interface duplex like this, not needing increases the I/O interface in addition, has simplified the external interface structure of television set.Pin multiplexing in the S terminal, wherein two ports are connected to the control unit of television set by bus, and bus is I in the present embodiment
2The C bus is promptly received SDA and these two pins of SCL of primary processor, and the power end of television set I/O interface is connected to the power input of the control unit of television set, and ground terminal is connected to the ground terminal of the control unit of television set.Television set memory cell 206 can be the internal RAM (Random Access Memory) of EEPROM or FLASH memory (flash memory) or television set control unit or external RAM (the Random Access Memory of television set control unit, random asccess memory), so still can retention data behind system cut-off, wherein store the information that the user such as white balance data, information volume, max volume information, contrast information, monochrome information of channel information, signal source can be provided with.
Reproducer 104 is made up of copier storage unit and copier I/O interface.In copier I/O interface wherein two ports be connected to copier storage unit by bus, bus is I in the present embodiment
2C promptly receives SDA and these two pins of SCL of EEPROM, and the copier I/power end of O interface is connected to the power input of the memory cell of reproducer, and the copier I/ground terminal of O interface is connected to the ground terminal of the memory cell of reproducer.Copier storage unit is EEPROM or FLASH memory or DRAM, so still can retention data behind system cut-off, be used to store the information that the user such as white balance data, information volume, max volume information, contrast information, monochrome information of the channel information that reads from television set, signal source can be provided with.The television set memory cell can be for identical or different with copier storage unit, and television set memory cell and copier storage unit all are example with EEPROM in the present embodiment.
Because I
2C (Inter-Integrated Circuit) universal serial bus has two holding wires: one is two-way data wire SDA, and another root is clock line SCL.All receive I
2The serial data line SDA of the equipment on the C bus receives the sda line of bus, and clock line SCL receives the SCL of bus.The operation of bus (transfer of data) is by host computer control, and so-called main frame is the transmission (sending enabling signal) of log-on data, sends the equipment of stop signal when sending clock signal, transmission end that main frame is a microprocessor usually.The equipment of being looked for by main frame all is called slave.In order to carry out communication, each receives I
2The equipment of C bus all has a unique address, so that main frame is looked for.The data of main frame and slave transmit, and can send data to slave by main frame, also can be that slave is dealt into main frame.Every equipment that sends data to bus is called transmitter, and the equipment that receives data from bus is called recipient.Like this, when copier I/O interface and the television set I/O interface S terminal by television set was linked to each other, television set control unit 204 can respond user instruction, and control I
2The transfer of data of C bus flows to, and reads the configuration information in the television set memory cell 206, is written in the copier storage unit; Perhaps read the configuration information in the copier storage unit, be written in the television set memory cell 206.This mode not only can be duplicated channel information, and other configuration informations that can duplicate the user who is stored in the TV set EEPROM for example, the white balance data of channel information, signal source, information volume, max volume information, contrast information, monochrome information.
In addition, only need be connected by a connecting line between reproducer and the television set, an end of connecting line connects the S terminal of television set, and an other end connects the I/O mouth of reproducer.Connecting line also can directly extract from reproducer for an end, an other end is and the plug that cooperates the S terminal that reproducer has reduced system cost by the power supply power supply of television set, and increased the reliability of system, line also becomes simple between reproducer and the television set.
The system that the user can be provided with to copying setup information of TV by the button on remote controller or the TV set panel sends instruction.As shown in Figure 2, increase corresponding menu on the OSD of television set (on-screen display, the screen menu type regulative mode) interface, press the button on the remote controller after, screen can eject this menu.When the user enters " read-write of setup information of TV " interface, at first need to import correct administrator's password, could select option " to read EEPROM " or option " writes EEPROM ", to carry out next step operation.In addition, the OSD interface can have more detailed second-level menu, and the user can select all or part of configuration information that need duplicate by remote controller.
The user uses a teleswitch and selects option " to write EEPROM ", send instruction for television set 102 by the right button in the directionkeys on the remote controller, after the detecting unit 216 of television set 102 receives this instruction, whether detect copier I/O interface and television set I/O interface connection status normal, if connection status is undesired, then on the interface, provide corresponding prompting, if connection status is normal, then the comparing unit 218 of television set relatively the size of the free memory of copier storage unit and comparative result sent to television set control unit 204 whether greater than the byte-sized of selecteed configuration information in the television set memory cell.If be judged as "Yes", after then television set control unit 204 is received this signal, begin to read the configuration information of the selection among the EEPROM 206 of television set, and be written to the EEPROM of reproducer.
If the user has selected " reading EEPROM " menu, process similarly.The user uses a teleswitch and selects option " to read EEPROM ", send instruction for television set 102 by the right button in the directionkeys on the remote controller, after the detecting unit 216 of television set 102 receives this instruction, whether detect copier I/O interface and television set I/O interface connection status normal, if connection status is undesired, then on the interface, provide corresponding prompting, if connection status is normal, then the comparing unit 218 of television set relatively the size of the free memory of television set memory cell and comparative result sent to television set control unit 204 whether greater than the byte-sized of selecteed configuration information in the reproducer.If be judged as "Yes", after then television set control unit 204 is received this signal, begin to read selecteed configuration information among the EEPROM of reproducer 104, and be written to the EEPROM of television set, can make things convenient for the user to understand the state of the system of current copying setup information of TV for the user provides corresponding prompt information on the OSD interface.
Can also be provided with the indicator light of indication read-write process in the television set 102, indicator light can be LED, when transmitting data between reproducer and the television set, the indicator light flicker, can not disconnect being connected between reproducer and the television set this moment, when DTD, indicator light extinguishes, and allows to pull out the connecting line between reproducer and the television set this moment.
The process of the method for this method copying setup information of TV is described below in conjunction with Fig. 2, Fig. 3.
Step S302, using a teleswitch is provided with a television set, after configuration informations such as the volume of television set, channel information are set, the control unit of this television set and the memory cell of reproducer is passed through I
2The C bus connects; The power input of control unit of having established the television set of information-setting by user is connected with the power input of the memory cell of reproducer, and the ground terminal of control unit of having established the television set of information-setting by user is connected with the ground terminal of the memory cell of reproducer;
Step S304, the user selects in the OSD menu of television set " reading EEPROM ", and television set receives user instruction, and whether detect copier I/O interface normal with the I/O interface connection status of having established the information-setting by user television set, if state is normal, then carry out next step;
Step S306, relatively whether the free memory of copier storage unit greater than the byte-sized of the information-setting by user in the memory cell of establishing the information-setting by user television set, sends to the television set control unit with comparative result; Can make things convenient for the user to understand the operating state of the system of current copying setup information of TV for the user provides corresponding prompt information on the OSD interface.
Step S308 has established the control unit of the television set of information-setting by user and has controlled I according to comparative result
2The data flow of C bus if comparative result is a "Yes", then reads the information-setting by user of having established in the information-setting by user television set memory cell, and is written in the memory cell of reproducer;
Step S310 disconnects being connected between reproducer and the television set of establishing information-setting by user, and the memory cell of reproducer is passed through I
2The C bus is connected with another control unit of not establishing the television set of information-setting by user; The power input of control unit of not establishing the television set of information-setting by user is connected with the power input of the memory cell of reproducer, and the ground terminal of control unit of not establishing the television set of information-setting by user is connected with the ground terminal of the memory cell of reproducer.
Step S312, user select " to write EEPROM " in the OSD menu in the television set, after television set receives user instruction, detect reproducer and the connection status of not establishing between the television set of information-setting by user whether normal, if state is normal, then carry out next step;
Step S314, the free memory of television set memory cell of not establishing information-setting by user sends to comparative result the television set control unit of not establishing information-setting by user whether greater than the byte-sized of the information-setting by user in the copier storage unit;
Step S316, the control unit of television set of not establishing information-setting by user be according to comparative result, control I
2The data flow of C bus if comparative result is a "Yes", then reads the information-setting by user in the copier storage unit, and is written in the television set memory cell of not establishing information-setting by user.
Like this, just finished the process of the information reproduction of a television set that will set to other television set.
Wherein, information-setting by user comprises white balance data, information volume, max volume information, contrast information, the monochrome information of channel information, signal source.But so can realize the duplicating of user's configuration information between the television set.Memory cell can have multiple choices, the memory cell of television set can be the internal random memory of electricallyerasable ROM (EEROM) or flash memory or television set control unit or the external memory storage of television set control unit, and the memory cell of reproducer can be electricallyerasable ROM (EEROM) or flash memory.Like this, also can keep original data behind the system cut-off.
In the environment that this mode can be applied to unify to be provided with to multiple TV set, for example be provided with in the TV setting in each room or the factory TV being dispatched from the factory to detect in the hotel, thereby simplify the setup work, by a television set only is set, can finish the work that is provided with easily to multiple TV set.
More than; only be the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range that claim was defined.
Claims (10)
1, a kind of system of copying setup information of TV, comprise television set and reproducer, described television set comprises television set control unit, television set memory cell and television set I/O interface, store information-setting by user in the described television set memory cell, described television set I/O interface comprises the I that is connected to described television set control unit
2The C bus port; Described reproducer comprises copier storage unit and copier I/O interface; Described copier I/O interface comprises the I that is connected to described copier storage unit
2The C bus port, described television set I/O interface and described copier I/O interface pass through I
2The C bus connects, and it is characterized in that:
Described television set control unit is used to control I
2The transfer of data of C bus flows to, and reads the information-setting by user in the television set memory cell, and is written in the described copier storage unit; Perhaps read the information-setting by user in the described copier storage unit, and be written in the television set memory cell;
Wherein said information-setting by user comprises white balance data, information volume, max volume information, contrast information, the monochrome information of channel information, signal source.
2, the system of copying setup information of TV according to claim 1 is characterized in that:
Described television set I/O interface also comprises power port and ground wire port, and described power port links to each other with the power input of television set control unit, and described ground wire port links to each other with the ground terminal of television set control unit;
Described copier I/O interface also comprises reproducer power port and reproducer ground wire port, and described reproducer power port links to each other with the power input of described copier storage unit, and described reproducer ground wire port links to each other with the ground terminal of copier storage unit.
3, the system of copying setup information of TV according to claim 2 is characterized in that:
The I/O interface of described television set is the normal video interface or the separate type image terminal in Video Graphics Array interface or Europe.
4, the system of copying setup information of TV according to claim 1 is characterized in that:
Described television set also comprises detecting unit, and after detecting unit received user instruction, whether normal, and export testing result if detecting between described copier I/O interface and the described television set I/O interface connection status;
Described television set also comprises the comparing unit that is connected with described detecting unit, after comparing unit receives described testing result, relatively in the television set memory cell byte-sized of information-setting by user whether greater than the free memory size of copier storage unit; Perhaps relatively the byte-sized of the information-setting by user in the copier storage unit and outputs to described television set control unit with comparative result whether greater than the free memory size of television set memory cell.
5, the system of copying setup information of TV according to claim 1 is characterized in that:
Described television set memory cell is the internal random memory of electricallyerasable ROM (EEROM) or flash memory or television set control unit or the external random access memory of television set control unit;
Described copier storage unit is electricallyerasable ROM (EEROM) or flash memory.
6, a kind of method of copying setup information of TV, television set comprise the television set memory cell that is used to store information-setting by user, it is characterized in that, described method comprises:
Step (1) is passed through I with a control unit of having established the television set of information-setting by user
2The C bus is connected with the memory cell of reproducer;
Step (2) has been established the control unit response user instruction of the television set of information-setting by user, reads the information-setting by user in the memory cell of the television set of establishing information-setting by user, and is written in the memory cell of described reproducer;
Step (3), the control unit that disconnects the television set established information-setting by user is connected with the memory cell of reproducer, and the memory cell of described reproducer is passed through I
2The C bus is connected with another control unit of not establishing the television set of information-setting by user;
Step (4) is not established the control unit response user instruction of the television set of information-setting by user, and read the information-setting by user in the memory cell of described reproducer, and be written in the memory cell of the television set of not establishing information-setting by user,
Wherein, described information-setting by user comprises white balance data, information volume, max volume information, contrast information, the monochrome information of channel information, signal source.
7, the method for copying setup information of TV according to claim 6 is characterized in that,
Described step (1) also comprises, the power input of the control unit of the described television set of having established information-setting by user is connected with the power input of the memory cell of described reproducer, and the ground terminal of the control unit of the described television set of having established information-setting by user is connected with the ground terminal of the memory cell of described reproducer.
8, the method for copying setup information of TV according to claim 6 is characterized in that,
Described step (3) also comprises, the power input of the control unit of the described television set of not establishing information-setting by user is connected with the power input of the memory cell of described reproducer, and the ground terminal of the control unit of the described television set of not establishing information-setting by user is connected with the ground terminal of the memory cell of described reproducer.
9, the method for copying setup information of TV according to claim 6 is characterized in that,
The control unit response user instruction of having established the television set of information-setting by user in the described step (2) comprises:
Step (a), receive user instruction after, detect the memory cell of described reproducer and the connection status of having established between the control unit of television set of information-setting by user whether normal, if state is normal, then change step (b) over to;
Step (b), the free memory size of the memory cell of more described reproducer send to comparative result the control unit of television set whether greater than the byte-sized of information-setting by user in the memory cell of the television set of establishing information-setting by user;
The control unit response user instruction of not establishing the television set of information-setting by user in the described step (4) comprises:
Step (c), receive user instruction after, whether the connection status that detects between the control unit of the memory cell of described reproducer and the described television set of not establishing information-setting by user normal, if state is normal, then changes step (d) over to;
Step (d), whether the free memory size of the memory cell of the more described television set of not establishing information-setting by user greater than the byte-sized of information-setting by user in the memory cell of described reproducer, sends to the described television set control unit of not establishing information-setting by user with comparative result.
10, the method for copying setup information of TV according to claim 6 is characterized in that,
The memory cell of described television set is the internal random memory of control unit of electricallyerasable ROM (EEROM) or flash memory or television set or the external random access memory of television set control unit;
Described copier storage unit is electricallyerasable ROM (EEROM) or flash memory.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101874794A CN101448069A (en) | 2007-11-27 | 2007-11-27 | System and method for copying setup information of TV |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101874794A CN101448069A (en) | 2007-11-27 | 2007-11-27 | System and method for copying setup information of TV |
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| CN101448069A true CN101448069A (en) | 2009-06-03 |
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| CNA2007101874794A Pending CN101448069A (en) | 2007-11-27 | 2007-11-27 | System and method for copying setup information of TV |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101600069A (en) * | 2009-07-07 | 2009-12-09 | 福建捷联电子有限公司 | LCD or television set automatically resetting factory settings device and method |
| CN102202193A (en) * | 2011-05-27 | 2011-09-28 | 深圳创维－Rgb电子有限公司 | Factory channel information configuration method and device for digital television |
| CN103853676B (en) * | 2014-03-28 | 2016-08-17 | 苏州科达科技股份有限公司 | Channel distribution, release, data transmission method and the system of Based PC Ie bus |
| CN109064999A (en) * | 2018-07-20 | 2018-12-21 | 珠海诚锋电器有限公司 | A kind of picture image parameter regulation means and its device based on screen back light value |
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2007
- 2007-11-27 CN CNA2007101874794A patent/CN101448069A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101600069A (en) * | 2009-07-07 | 2009-12-09 | 福建捷联电子有限公司 | LCD or television set automatically resetting factory settings device and method |
| CN101600069B (en) * | 2009-07-07 | 2014-10-22 | 福建捷联电子有限公司 | Device and method for automatically resetting factory settings of liquid crystal display or television |
| CN102202193A (en) * | 2011-05-27 | 2011-09-28 | 深圳创维－Rgb电子有限公司 | Factory channel information configuration method and device for digital television |
| CN103853676B (en) * | 2014-03-28 | 2016-08-17 | 苏州科达科技股份有限公司 | Channel distribution, release, data transmission method and the system of Based PC Ie bus |
| CN109064999A (en) * | 2018-07-20 | 2018-12-21 | 珠海诚锋电器有限公司 | A kind of picture image parameter regulation means and its device based on screen back light value |
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