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Foundations of Enjoying AV Part 3: Thinking Like a Physicist About Accelerators (or Inverse Spectrometers) for High-Precision Synthesis of Visible Light Spectra from Digital Signals... Things We Take for Granted to the Point of Not Noticing

2026年5月10日 14:01

Every day spent immersed in the world of Audio/Visual...
My interest deepened further after coincidentally getting my hands on the latest Xperia device...

I am moved by the beauty of its organic EL (OLED) screen. A simple question arose in that context.

Colors are supposed to be enjoyed by the retina as differences in light frequency, yet I feel a sense of discomfort with the world of the color wheel, where discussions are forcibly forced into a circular shape...

To begin with, what does the color wheel actually represent? About a quarter of the color wheel (near magenta) is defined as a "region of non-existent frequencies" or a "discontinuous jump." This is easy to understand. Moreover,

Replacing the color wheel with frequency is nothing more than visualizing a bug (or an extremely sophisticated form of interpolation) in the brain's coordinate transformation when converting a "continuous physical quantity" into a "circular perceptual quantity."
Considering the structure of the human retina, I believe the orthodox approach for an image display is to master panel design and drive logic based on the spectral sensitivity characteristics l(λ), m(λ), and s(λ) of the three types of cone cells (L, M, S) on the retina. Therefore, I would like to compare the technology of, for example, Sony's latest Bravia with the aforementioned way of thinking and examine/verify its positioning at an equivalent level.

Starting from the topic of the color wheel, I want to delve deeper into how we humans perceive light in the first place, and what kind of thinking goes into providing displays for that purpose.

In the end, I understood that what I have been enjoying is the pinnacle of "heuristic optimization" that places weight on "brain coordinate transformation (cognition)." For example, I was able to well understand the background behind the overwhelming beauty of the images on the latest Sony Xperia.

...............................................................

This time, regarding the conclusion of that consideration

4. Conclusion and Future Prospects

Sony's technology is at the pinnacle of "heuristic optimization" that, while based on the physical "reproduction of LMS sensitivity characteristics," places weight on the higher layer of"brain coordinate transformation (cognition)."The next step in mastering the orthodox approach would be the implementation of "Individual LMS Calibration," where the viewer's individual visual characteristics (individual differences in LMS curves) are measured with a camera or similar device, and the drive logic is personalized accordingly. It can be said that the current Bravia bridges the gap in physical spectra at the cognitive level by connecting professional master monitors (such as the BVM-HX3110) and consumer devices with the same "XR Processor."
In this video, I visually explain the physical mechanism of how modern displays combine the three primary colors of light to stimulate the three types of cone cells in the human retina to achieve full color.

I will delve deeper into this. The subject is the professional master monitor (BVM-HX3110).

Source

Source

I have proceeded to consider one of the origins of video production more deeply.

A masterful consideration.

The BVM-HX3110 is, so to speak, an "accelerator (or inverse spectrometer) for high-precision synthesis of visible light spectra from digital signals."

It was my amateur thinking...

"Design based on LMS sensitivity" aims for "direct stimulation at the receptor level," going beyond the current CIE color system (RGB/XYZ) that passes through color-matching functions.
Drive logic: Process input signals in LMS space and independently control the amount of stimulation to each cone in the retina.

There was a problem with this.

Physical Barrier (Observer Metamerism): The l(λ), m(λ), and s(λ) curves shift minutely due to individual differences (aging, macular pigment density). The more narrow-band primary colors (lasers or quantum dots) are used, the more this slight difference manifests as a problem of 'color appearance mismatch'.

In response to this, I have learned that professionals in the current video field have prepared extremely realistic solutions. If you place an easy-to-understand consumer Bravia next to it...

While Bravia mimics 'how the brain interprets the world,' the BVM attempts to control 'the number of photons emitted by the world itself.' In particular, reaching 4000\text{ nits} in the HX3110 is close to the final goal for expressing the physical limits of the HDR10 standard without omission. The true value of this device lies not in 'showing' colors, but in 'guaranteeing the physical quantity of colors.' To that end, the essence of this class of monitor is the pursuit of optical filter design that minimizes LMS sensitivity deviations due to individual differences, and arithmetic circuits that reproduce the ST 2084 curve without shaking even by a single bit.

That is the conclusion, and it is what professionals are pursuing every day.

In a professional setting, the 'color' determined by this monitor becomes the 'origin' when it reaches the retinas of all humanity.

That is a profound statement.

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Material: Text-based

Sony's professional master monitor, especially the latest BVM-HX3110, is equipment for embodying a physical 'absolute reference,' whereas the consumer Bravia uses 'brain completion (cognitive characteristics).' From a physicist's perspective, this monitor can be said to be a device that solves an extremely rigorous inverse problem: 'how to faithfully convert electromagnetic wave numerical values into pure luminance L and chromaticity coordinates (x, y) on a one-to-one basis.'

1. Physical Structure: Engineering Necessity of TRIMASTER HX (Dual-Layer LCD)

The fact that the BVM-HX3110 adopts LCD-based technology rather than OLED stems from a commitment to physical robustness and precision.

Spatial Modulation via Dual-Layer LCD (Double-Stacked)

By stacking two LCD panels, the backlight is controlled in stages by the 'first layer (pixel-level dimming)' and the 'second layer (color reproduction).'

Physical Advantages: This achieves a contrast ratio of over 1,000,000:1, which was impossible with conventional LCDs. While reproducing deep blacks close to the self-emissive nature of OLED, it physically eliminates burn-in (degradation) during high-brightness operation, which is a weakness of OLED.
Numerical Data: Maximum brightness is 4000\text{ cd/m}^2 (typical value). This not only far surpasses Bravia, but is also a level capable of physically outputting sunlight specular reflections and high-brightness HDR metadata without clipping (saturation).

2. Accuracy of Transfer Function: Perfect Tracing of EOTF (SMPTE ST 2084)

The mission of a master monitor is for the output luminance L to perfectly match a specific function (EOTF) for an input signal x.
The BVM-HX3110 has drive logic that traces this ST 2084 (PQ curve) within a few percent error across the entire dynamic range. It performs no tone mapping (gradation compression) for the sake of 'appearance' as consumer machines do, and outputs only physical 'truth'.

3. Engineering Challenge to 'Observer Metamerism'

Related to the LMS sensitivity discussion mentioned above, what is most feared in the professional world is 'Observer Metamerism'.

The Dilemma of Narrow-Band Primaries

The narrower the spectral width of the display's primary colors (R, G, B), the wider the color gamut becomes; however, the problem of "not looking like the same color" due to individual differences in LMS sensitivity becomes more serious.

Application of Judd-Voss correction: Sony has long incorporated findings such as the Judd-modified CMF (Color Matching Functions) into factory calibration to compensate for the lack of short-wavelength (blue) sensitivity present in the definition of the CIE 1931 standard observer.
BVM-HX3110 design: The newly developed panel and anti-reflection technology minimize spectral variation due to viewing angle. When multiple creators look at the monitor simultaneously, it suppresses the individual differences (angle dependency) that occur in the LMS response on the retina to the absolute limit.

4. Comparative Verification: Bravia (Cognitive) vs BVM (Physical)

5. Discussion: Perspective as a Physicist

The BVM-HX3110 is, so to speak, **"an accelerator (or inverse spectrometer) for synthesizing visible light spectra from digital signals with high precision." While the Bravia mimics "how the brain interprets the world," the BVM attempts to control "the number of photons emitted by the world itself." In particular, reaching 4000 nits in the HX3110 is close to the final solution for expressing the physical limits of the HDR10 standard without omission. The true value of this device lies not in "showing" colors, but in "guaranteeing the physical quantity of colors." To that end, the essence of this class of monitor is the pursuit of optical filter design that minimizes LMS sensitivity deviations due to individual differences, and arithmetic circuits that reproduce the ST 2084 curve without wavering by even a single bit. In a professional setting, the "color" determined on this monitor becomes the "origin point" when it reaches the retinas of all humanity.

**

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