CN204131621U - A kind of circuit solving compatibility when television set connects HDMI disc player - Google Patents
A kind of circuit solving compatibility when television set connects HDMI disc player Download PDFInfo
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- CN204131621U CN204131621U CN201420459310.5U CN201420459310U CN204131621U CN 204131621 U CN204131621 U CN 204131621U CN 201420459310 U CN201420459310 U CN 201420459310U CN 204131621 U CN204131621 U CN 204131621U
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Abstract
The utility model discloses a kind of circuit solving compatibility when television set connects HDMI disc player, circuit comprises television set master chip, HDMI stand, current-limiting resistance, pull down resistor, the first divider resistance and the second divider resistance, the GPIO interface that TV master chip is connected with the Handshake Protocol pin of HDMI stand is by pull down resistor ground connection, the power pins of HDMI stand, by after the first divider resistance and the second divider resistance dividing potential drop, is connected with another GPIO mouth of TV master chip.The utility model utilizes main control chip GPIO characteristic and HDMISPEC agreement to specify, better can solve compatibility issue during collocation HDMI output equipment, and can reach cost-effective object.
Description
Technical field
The utility model discloses a kind of television set, particularly a kind of circuit solving compatibility when television set connects HDMI disc player.
Background technology
4K2K is a kind of abbreviation of high definition display resolution.On market general using 720P as high definition standard, current technical HDTV (High-Definition Television) resolution is 1280 × 720,4K2K ultra high-definition then reaches the physical resolution of 3840 × 2160, it is the wide high each twice of common FullHD (1920X1080), four times of area, the total pixel number amount of display device reaches more than 8,000,000.Consumer not only just rests on TV hardware equipment the pursuit of panel TV, TV can be compatible software and the rich of content also seem especially important.Expert emphasizes, from the development of HDTV (High-Definition Television), internet television, intelligent television, 3D TV and cloud TV before, Dou Shi terminal hardware manufacturer is leading from angles of product, and then promote industry transition and upgrade, drive the development in software and television broadcasting field, this feature can appear at ultra high-definition television industries equally.
Expert points out, 4K2K product, especially large scale specification product, and not only for research and development and cost, all there is all many-sides to existing supply, manufacture, marketing, logistics is all challenge.Frivolous based on ultra high-definition product, to be pleasantly surprised characteristic, has all carried out higher standard-required to the supply chain of whole product.
At present, in existing TV HDMI port design process, be the difficult point faced of all industry designers to the compatibility of outside HDMI input equipment always.Using TV as display, need arrange in pairs or groups with numerous HDMI output equipment, and want can normally and external equipment shake hands, and normally to show.And when arranging in pairs or groups numerous HDMI output equipment, because the difference of sequential of shaking hands, external equipment usually can be caused normally cannot to read the EDID of TV, thus the situation causing display abnormal occurs.Above-mentioned situation is usually present in external equipment and first powers on, and powers on after TV; Or external equipment normally works, TV to power on etc. in situation again, because the exception that sequential of shaking hands causes.Be all GPIO mouth is increased triode to carry out oppositely in traditional design, then be connected with Handshake Protocol pin (HDMI the 19th pin), therefore, just have pull-up resistor at HDMI the 19th pin.If power taking is unreasonable or occur shake in wire rod swapping process, external equipment may be allowed to produce misoperation, if and external equipment only responds a handshake in design, after it is disturbed by dither signal, fail normal to complete whole Handshake Protocol with TV, then can cause the phenomenon showing exception.
Summary of the invention
For the above-mentioned motor HDMI port line relative complex of the prior art mentioned, and there is the defect of certain misoperation risk, the utility model provides a kind of circuit for solving TV HDMI port compatibility newly, and it coordinates television set master chip can realize promoting the problem of television set HDMI port compatibility by pull down resistor.
The utility model solves the technical scheme that its technical problem adopts: a kind of circuit solving compatibility when television set connects HDMI disc player, circuit comprises television set master chip, HDMI stand, current-limiting resistance, pull down resistor, first divider resistance and the second divider resistance, the GPIO interface that TV master chip is connected with the Handshake Protocol pin of HDMI stand is by pull down resistor ground connection, the power pins of HDMI stand is by after the first divider resistance and the second divider resistance dividing potential drop, first divider resistance is connected with another GPIO mouth of TV master chip with the common port of the second divider resistance.
The technical scheme that the utility model solves the employing of its technical problem further comprises:
Current-limiting resistance is connected in series with between the described GPIO interface that is connected with the Handshake Protocol pin of HDMI stand and the Handshake Protocol pin of HDMI stand.
Described current-limiting resistance resistance is 1 ~ 10 Ω.
Described television set master chip adopts model to be the television set chip of RTD2995.
Described pull down resistor resistance is 1K Ω.
The first described divider resistance be organized as 27K Ω, the resistance of the second divider resistance is 51K Ω.
The beneficial effects of the utility model are: the utility model utilizes main control chip GPIO characteristic and HDMISPEC agreement to specify, better can solve compatibility issue during collocation HDMI output equipment, and can reach cost-effective object.
Below in conjunction with the drawings and specific embodiments, the utility model is described further.
Accompanying drawing explanation
Fig. 1 is the utility model circuit theory diagrams.
Fig. 2 is the present utility model point partial circuit schematic diagram.
Embodiment
The present embodiment is the utility model preferred implementation, and other its principles all are identical with the present embodiment or approximate with basic structure, all within the utility model protection range.
Please refer to accompanying drawing 1 and accompanying drawing 2, the utility model mainly comprises television set master chip U8, HDMI stand, series limiting resistor R392, pull down resistor R386, divider resistance R589 and divider resistance R590, PLUG pin (the 19th pin of TV master chip U8 and HDMI stand, i.e. Handshake Protocol pin) the GPIO interface that connects is by pull down resistor R386 ground connection, be connected with the 19th pin of HDMI stand by current-limiting resistance R392 by this GPIO mouth, 18th pin input 5V power supply of HDMI stand is by after resistance R589 and resistance R590 dividing potential drop, be connected with another GPIO mouth of TV master chip U8, wherein, one end of resistance R589 is connected with the 18th pin of HDMI stand, the resistance R589 other end is connected with resistance R590 one end, resistance R590 other end ground connection, resistance R589 is connected with the GPIO mouth of TV master chip U8 with the common port of resistance R590.In the present embodiment, television set master chip U8 adopts model to be the television set chip of RTD2995, when specifically implementing, the television set chip of other models also can be adopted to substitute.Pull down resistor R386 employing resistance in the present embodiment is the resistance of 1K Ω, and series winding current-limiting resistance value is 1 ~ 10 Ω, and the resistance being preferably 4.7 Ω, divider resistance R589 is 27K Ω, and the resistance of divider resistance R590 is 51K Ω.
Above-described embodiment is the circuit theory that the utility model is connected with a HDMI, when specifically implementing, also can carry multiple HDMI, and the circuit structure of its each HDMI is all identical with said structure.
In the utility model, due to the GPIO mouth of television set master chip U8 be all high-impedance state, namely television set master chip U8 do not power on or power on initialization is not done to GPIO mouth time, the external impedance of GPIO mouth is all high-impedance state, like this system do not power on or system electrification also not to do GPIO mouth carry out initialization time, the level that external HDMI equipment is obtained by HDMI stand the 19th pin can be continuously low level.According to the protocol requirement of HDMISPEC, external HDMI equipment is after display device is ready to, must export from the 19th pin of HDMI stand and become the signal of high level to external equipment from low level, just can think that display device is ready to when external equipment receives this signal, both sides shake hands foundation, can carry out next step action.At this moment outside design can read the EDID of television system, to know the HDMI display format that this television system is supported, to determine to export Timing.And display device judges have HDMI external equipment whether to access by external equipment from the 5V level of the 18th pin feeding of HDMI stand.If in this process, it is not feed back high level by the main IC of TV that external equipment obtains from HDMI stand the 19th pin, then may perform follow-up Handshake Protocol in the unripe situation of television system, cause shaking hands unsuccessfully.The utility model utilizes TV master chip GPIO high-impedance state characteristic, design this circuit, at system boot and not to when selecting GPIO to do initialization, HDMI stand the 19th pin can be continuously low level, the fluctuation of voltage can not be produced in start or HDMI wire material swapping process, cause external equipment misoperation.Work as system boot, under being switched to HDMI passage, after the success of initialization HDMI module, can this GPIO mouth of initialization, and by it by low level, be set to high level.If now external equipment is started shooting, then can receive this level variable signal, think foundation of shaking hands, carry out next step and link up.
The utility model designs, and can meet external equipment and first start shooting, television system is started shooting again; Or television system is first started shooting, external equipment is started shooting again; External equipment is started shooting, and television system is started shooting under ideal case; External equipment is started shooting, under television system start, patch Handshake Protocol in the situations such as HDMI wire material and set up, and high impulse etc. can not be produced allow the signal of external equipment misoperation, to guarantee to shake hands successfully with external HDMI equipment, to solve the compatibility issue connecing HDMI equipment.
The utility model, in conjunction with each main control chip and HDMI SPEC code requirement, better can solve the problem of television equipment HDMI compatibility, and can reach cost-effective object.
Claims (6)
1. one kind solves the circuit of compatibility when television set connects HDMI disc player, it is characterized in that: described circuit comprises television set master chip, HDMI stand, current-limiting resistance, pull down resistor, the first divider resistance and the second divider resistance, the GPIO interface that TV master chip is connected with the Handshake Protocol pin of HDMI stand is by pull down resistor ground connection, the power pins of HDMI stand, by after the first divider resistance and the second divider resistance dividing potential drop, is connected with another GPIO mouth of TV master chip.
2. the circuit of compatibility when solution television set according to claim 1 connects HDMI disc player, is characterized in that: be connected in series with current-limiting resistance between the described GPIO interface that is connected with the Handshake Protocol pin of HDMI stand and the Handshake Protocol pin of HDMI stand.
3. when solution television set according to claim 2 connects HDMI disc player, the circuit of compatibility, is characterized in that: described current-limiting resistance resistance is 1 ~ 10 Ω.
4. the circuit of compatibility when the solution television set according to claim 1 or 2 or 3 connects HDMI disc player, is characterized in that: described television set master chip adopts model to be the television set chip of RTD2995.
5. when the solution television set according to claim 1 or 2 or 3 connects HDMI disc player, the circuit of compatibility, is characterized in that: described pull down resistor resistance is 1K Ω.
6. the circuit of compatibility when the solution television set according to claim 1 or 2 or 3 connects HDMI disc player, it is characterized in that: the resistance of the first described divider resistance is 27K Ω, the resistance of the second divider resistance is 51K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420459310.5U CN204131621U (en) | 2014-08-14 | 2014-08-14 | A kind of circuit solving compatibility when television set connects HDMI disc player |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420459310.5U CN204131621U (en) | 2014-08-14 | 2014-08-14 | A kind of circuit solving compatibility when television set connects HDMI disc player |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204131621U true CN204131621U (en) | 2015-01-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420459310.5U Active CN204131621U (en) | 2014-08-14 | 2014-08-14 | A kind of circuit solving compatibility when television set connects HDMI disc player |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204131621U (en) |
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2014
- 2014-08-14 CN CN201420459310.5U patent/CN204131621U/en active Active
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| GR01 | Patent grant |