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TCL C725 : Reviews - Εντυπώσεις - Σχόλια
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<blockquote data-quote="Pleo" data-source="post: 1058735187" data-attributes="member: 8708"><p>Δυστυχώς πλέον γίνεται όλο και πιο δύσκολο να καταλάβει κάποιος τι υποστηρίζει η οθόνη του.</p><p></p><p>[URL unfurl="true"]https://tftcentral.co.uk/articles/when-hdmi-2-1-isnt-hdmi-2-1[/URL]</p><p></p><p>Για το δικό σου θέμα, το μόνο που μπορείς να κάνεις είναι να δεχτείς το 4:2:2 ή τα 8 bit. Κάτι άλλο δεν γίνεται. Το καλώδιο κατά πάσα πιθανότητα δεν φταίει.</p><p></p><p>Γιατί πολύ απλά είναι θέμα FRL και TMDS. Δηλαδή δεν υποστηρίζεται FRL κατά πάσα πιθανότητα το οποίο θα επέτρεπε έστω με συμπίεση να περάσει 4Κ60 10 bit 4:4:4 με μειωμένο bandwidth, αλλά επείδή hardwarικά δεν υποστηρίζεται κάτι τέτοιο, πολύ απλά δεν γίνεται.</p><p></p><h3><strong>Bandwidth, Resolution and Refresh Rate</strong></h3><p>To reach the all-important 4K 120Hz support (including 10-bit colour uncompressed) you need a higher bandwidth than was possible with HDMI 2.0. We will ignore resolutions beyond 4K for now as they are not really available in the monitor market anyway, and the focus is very much on 4K right now. For more info on potential supported resolutions <a href="https://hdmi.org/spec21sub/eightk60_fourk120" target="_blank">see HDMI.org here</a>.</p><p></p><p>HDMI 2.1 as a standard can support “FRL” (Fixed Rate Link) signalling. As HDMI.org explain on <a href="https://hdmi.org/spec21sub/eightk60_fourk120" target="_blank">their website</a>: <em>“FRL stands for Fixed Rate Link and it’s a signalling technology supported in the HDMI 2.1 Specification. FRL is necessary to achieve the higher uncompressed resolutions such as those above 4k60 as well as the ultra high speed bandwidths up to 48Gbps. It’s also required for compressed video transport which in turn enables operation at lower data rates for example 4k60 and ultra-high pixel rate video such as 10Kp120.</em>“</p><p></p><p>FRL replaces the older TMDS (Transition Minimised Differential Signalling) signalling method that was used by the older HDMI 2.0 to deliver then the maximum 18Gbps transmission bandwidth on that interface. <strong><span style="font-size: 15px">TMDS allowed support for 4K 60Hz 8-bit colour depth but is nowhere near sufficient to support 4K 120Hz 10-bit uncompressed colour.</span></strong> The newer FRL signalling boosts the port bandwidth to 48Gbps maximum. Support for Display Stream Compression (v1.2) was also added to the HDMI 2.1 standard allowing even higher resolutions thanks to the additional visually lossless compression.</p><p></p><p>As HDMI.org explain on their website, the HDMI 2.1 specification still requires support for TMDS for backwards compatibility to seamlessly support the billions of HDMI devices that utilize TMDS, but you need to keep in mind that to support the higher bandwidths necessary for things like 4K 120Hz, it needs to support FRL too.</p><p></p><p>So in summary – TMDS signalling will support capabilities from HDMI 2.0 generation devices, and the newer FRL will support the higher bandwidths, resolutions and refresh rates most people associate with HDMI 2.1.</p></blockquote><p></p>
[QUOTE="Pleo, post: 1058735187, member: 8708"] Δυστυχώς πλέον γίνεται όλο και πιο δύσκολο να καταλάβει κάποιος τι υποστηρίζει η οθόνη του. [URL unfurl="true"]https://tftcentral.co.uk/articles/when-hdmi-2-1-isnt-hdmi-2-1[/URL] Για το δικό σου θέμα, το μόνο που μπορείς να κάνεις είναι να δεχτείς το 4:2:2 ή τα 8 bit. Κάτι άλλο δεν γίνεται. Το καλώδιο κατά πάσα πιθανότητα δεν φταίει. Γιατί πολύ απλά είναι θέμα FRL και TMDS. Δηλαδή δεν υποστηρίζεται FRL κατά πάσα πιθανότητα το οποίο θα επέτρεπε έστω με συμπίεση να περάσει 4Κ60 10 bit 4:4:4 με μειωμένο bandwidth, αλλά επείδή hardwarικά δεν υποστηρίζεται κάτι τέτοιο, πολύ απλά δεν γίνεται. [HEADING=2][B]Bandwidth, Resolution and Refresh Rate[/B][/HEADING] To reach the all-important 4K 120Hz support (including 10-bit colour uncompressed) you need a higher bandwidth than was possible with HDMI 2.0. We will ignore resolutions beyond 4K for now as they are not really available in the monitor market anyway, and the focus is very much on 4K right now. For more info on potential supported resolutions [URL='https://hdmi.org/spec21sub/eightk60_fourk120']see HDMI.org here[/URL]. HDMI 2.1 as a standard can support “FRL” (Fixed Rate Link) signalling. As HDMI.org explain on [URL='https://hdmi.org/spec21sub/eightk60_fourk120']their website[/URL]: [I]“FRL stands for Fixed Rate Link and it’s a signalling technology supported in the HDMI 2.1 Specification. FRL is necessary to achieve the higher uncompressed resolutions such as those above 4k60 as well as the ultra high speed bandwidths up to 48Gbps. It’s also required for compressed video transport which in turn enables operation at lower data rates for example 4k60 and ultra-high pixel rate video such as 10Kp120.[/I]“ FRL replaces the older TMDS (Transition Minimised Differential Signalling) signalling method that was used by the older HDMI 2.0 to deliver then the maximum 18Gbps transmission bandwidth on that interface. [B][SIZE=4]TMDS allowed support for 4K 60Hz 8-bit colour depth but is nowhere near sufficient to support 4K 120Hz 10-bit uncompressed colour.[/SIZE][/B] The newer FRL signalling boosts the port bandwidth to 48Gbps maximum. Support for Display Stream Compression (v1.2) was also added to the HDMI 2.1 standard allowing even higher resolutions thanks to the additional visually lossless compression. As HDMI.org explain on their website, the HDMI 2.1 specification still requires support for TMDS for backwards compatibility to seamlessly support the billions of HDMI devices that utilize TMDS, but you need to keep in mind that to support the higher bandwidths necessary for things like 4K 120Hz, it needs to support FRL too. So in summary – TMDS signalling will support capabilities from HDMI 2.0 generation devices, and the newer FRL will support the higher bandwidths, resolutions and refresh rates most people associate with HDMI 2.1. [/QUOTE]
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