Conventional LED walls are designed as "video playback devices." Video processors and frame buffers introduce latency and constraints for real-time expression. This system turns LEDs into instruments.
Conventional
映像ファイル / HDMIVideo File / HDMI
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メディアサーバMedia Server
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LED映像プロセッサLED Video Processor
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LEDウォールLED Wall
Proposed: Direct Pixel Control
音 / センサ / AI / 生成映像Sound / Sensor / AI / Generative
Achieving 480Hz depends on the panel's scan ratio, driver IC, wiring, and clock limits. Our proposal takes a phased approach to reach this target reliably.
Phase 1
120 ~ 240 Hz
既製パネルを前提に、現実的に到達可能な上限まで引き上げます。保証ラインとしてご提示いたします。
Push to the realistic ceiling with off-the-shelf panels. Presented as a guaranteed baseline.
Phase 2
480 Hz
480Hzを実現可能なパネル条件を選定し、仕様を確定したうえで到達いたします。
Select panel specs that can target 480Hz, lock specifications, and achieve it.
ボトルネック
Bottlenecks
走査比が大きいほど不利(例: 1/32は厳しい)Higher scan ratio is disadvantageous (e.g., 1/32 is tough)
階調ビット数が大きいほど不利(例: 16bitは厳しい)Higher grayscale bit depth is disadvantageous (e.g., 16-bit is tough)
Driver ICのシリアル入力クロック上限Driver IC serial input clock ceiling
HUBからモジュールまでの信号品質Signal quality from HUB to module
Design Principle: To reliably achieve 480Hz, we design around 12-bit grayscale and supplement with temporal dithering for perceptual depth where needed. Maintaining image quality alongside high refresh rate is a core design priority.
480Hz達成の具体策
Strategies for 480Hz
ビットプレーン方式を前提とします — 最上位ビットの時間占有を考慮し、ビット配分を最適化します
並列レーンを増設します — パネル入力を複数系統にすることで実効帯域を拡大します
走査の行分割を最適化します — 行切替のオーバヘッドを最小化します
信号経路を短く、等長にし、適切な終端処理を施します — 信号品質の確保が高速動作の前提条件です
フレームバッファを排除、もしくは1フレーム以内に限定します — 高更新と低遅延は同一の設計方向です
Assume bit-plane method — MSB consumes the most time, so design bit allocation carefully
Wessel and Wright set 10ms as the upper limit for computer audible response to gesture, stating that not only low latency but jitter matters — variation should not exceed 1ms.
Instrument-grade responsiveness requires sub-10ms latency. More critically, jitter (latency variation) must be suppressed — experience quality depends more on latency stability than average delay.
Classic HCI guidelines set 100ms as the upper limit for "direct manipulation feel." But this applies to UI — music and body-movement sync demands are far stricter.
VR desirable target is cited as under 20ms, with some conditions demanding down to 1ms. Research shows 1ms can be perceived in touch tasks, and 10ms begins to affect performance.
LEDを楽器として扱うためには、従来の映像機材レベルの遅延は許容できません。
If LED is to become an instrument, video-equipment-level latency is fatal.
For single projects, development costs are added, potentially exceeding conventional setups in total cost. The true value of this system emerges when the control assets are reused across multiple projects.