A TV can meet the industry’s own criteria for HDR displays even if it doesn’t achieve a target brightness or contrast level. The label on the box indicates that the set can decode an HDR signal, but it does not indicate that the picture will look different with an HDR signal. Consumer Technology Association published definitions for HDR are limited to describing the technical elements involved, such as signaling, metadata, and decoding.
The gap in these definitions means that TVs with the same HDR certification may look completely different when displaying a dark scene. The difference between these TVs is the hardware used that is often not described in the listing: the amount of light produced by the panel, and how well the backlighting can darken in one corner while illuminating in another. Four specification details help predict whether a TV will display HDR content and one of the details is the certification label.
HDR vs 4K: what each specification actually controls
When you see two listings both labeled “4K HDR”, many people mistakenly think that “4K HDR” is just one feature with one price point attached to it; but it is not. The CTA distinguishes between two features: 4K Ultra HD (which is based solely on pixel count) and HDR (Light Response) Compatible Display (which separates any pixel count dimensions from the brightness response). Therefore, any given set will meet either requirement.
When you are looking at the 4K definition, it is just a mathematical exercise (i.e., the way to calculate pixel counts). A display is defined as being 4K Ultra HD if it has at least 8 million active pixels (the number of horizontal pixels must be greater than or equal to 3840; the number of vertical pixels must greater than or equal to 2160); the aspect ratio must be at least 16:9; the display must have an HDR or upscaled video format capability; the HDMI (HDMI 1.4) input must support 3840 × 2160 resolution with copy protection on at least one input; and the minimum bit depth (for all RGB pixels) must be 8-bits. Each item defines how all pixels are exhibited, and none define the maximum amount of luminance in any one part of the picture.
The HDR distinction operates on the completely opposite principle from the pixel count dimensions defined by 4K. As RTINGS’ HDR-versus-SDR explainer puts it, HDR “completely changes the way luminance information is sent to the screen, separating it entirely from color and encoding it in absolute terms.”
In standard-range video, the brightness level is relative; the panel displays it based on the backlight setting selected by the user (e.g., using a dial). In the case of HDR (high dynamic range), 500 nits is equal to 500 nits regardless of how you’ve set the backlight. The TV will produce that much light at that particular point, and because of this distinction between these two formats, one screen can present a file beautifully while another may present it with no life whatsoever, even when both screens display all pixels correctly.
More pixels give you more detail. HDR asks for more light, and the panel either has it or it doesn’t.
What the “HDR” badge on a TV is actually required to mean
A TV’s HDR badge is a signal decoding claim rather than a picture quality claim; there is no mention about brightness or contrast or other hardware capabilities. In order for a display to be HDR compatible according to Consumer Technology Association (CTA), it must accept HDR signals, have metadata support, and decode signals using the HDR10 Media Profile and apply a transfer function. Brightness, contrast, dimming hardware, etc. are not addressed in the minimum requirements.
Here’s the whole list, from the CTA’s own definition document:
- At least one interface that supports HDR signaling as defined in CEA-861-F, as extended by CEA-861.3.
- The ability to receive and process static HDR metadata compliant with CEA-861.3 for uncompressed video.
- The ability to receive and process the HDR10 Media Profile — SMPTE ST 2084 as the transfer function, 10-bit depth, ITU-R BT.2020 color primaries, and SMPTE ST 2086 metadata carrying MaxFALL and MaxCLL.
- Applying an appropriate electro-optical transfer function before rendering the image.
When you read the job description, it becomes apparent that there is a gap between the two. The transfer function can be thought of as a lookup rule — taking the code value from the signal to determine what the luminance target is, i.e. that this code value should come out as a certain number of nits. Since the definition states that the TV is required to comply with that rule, it does not specify how far up the scale the TV panel can map.
A television that can only produce a brightness level lower than what the content is asking for can still comply with the rule — if it produces an image that has been tone-mapped down into the television’s maximum brightness output. A badge is earned regardless.
Now, contrast that with the specifications that do set “floor levels.” The VESA DisplayHDR performance tiers are defined and enumerated in tiers of specifications: the entry tier specifies that the minimum peak brightness level must be at least 400 cd/m², have at least 90% of the DCI-P3 color gamut, have at least 1,300:1 of static contrast ratio, and have maximum black level of 0.4 cd/m², while True Black tiers lower the black floor to 0.0005 cd/m². VESA also indicates that if you see a product advertised with a pseudo-spec, like HDR-400 instead of DisplayHDR 400, it is probably not certified.
DisplayHDR as a designation is used primarily for PC monitors and computer displays. Unfortunately, the television industry does not have a corresponding test performance level to this type of reporting for televisions either. The reason television manufacturers use logos on their packaging for “HDR” instead of numerical measurements like DisplayHDR employs for monitors is because there is no equivalent testing between the two product categories.
To illustrate how differing specifications are based on varying hardware implementation(s), you can view side-by-side images of products from one company along each segment of their product offerings. In the example provided by Roku, the Select Series 4K television uses direct-lit LED backlighting with 60Hz refresh rate along with supporting HDR10 and HDR10+. In the Select Series, the Plus Series incorporates Dolby Vision along with additional features like HDR10+ via full-array local dimming. Finally, the Pro Series takes the next step in terms of hardware by using mini-LED local dimming with 120 Hz refresh rates. You will see the same HDR format badges on the three different product lines, but you will also see that the actual backlighting used in each product line is entirely different from one another. The company has clearly indicated through its specifications that these are entirely separate products. Roku’s own product-information table lists the Select Series 4K as supporting HDR10 and HDR10+ on a direct-lit LED backlight at 60 Hz; the Plus Series carries Dolby Vision and HDR10+ with full-array local dimming; the Pro Series moves to mini-LED local dimming at 120 Hz.
The badge certifies that a TV can read HDR. Nothing in it certifies that HDR will look like anything.
Brightness in nits: why the peak figure isn’t the HDR picture
Nits are the measure of the amount of light a screen projects towards you per square inch of the display, with more nits equating to brighter images. The peak brightness quoted on any given product page usually represents the peak brightness rating of that product; however, it is the least true representative measurement of what you will actually see during viewing.
The main difference between HDR and standard-range content and the importance of this difference is that standard-range content was predominantly created with lighting setup at approximately 100-nits, with the user adjusting the backlight settings. The difference with HDR is that it has given control of the brightness levels back to the content creator. Therefore, if a scene was created with a lighting point of a thousand nits, there should be a point in the video at which it should be lit up with a thousand nits. As a result, if your TV is unable to achieve a peak brightness of 1,000 nits, it will compress the highlighted areas into smaller patches of lights instead of recreating them as intended by the colorist; thus, you will not experience the intended HDR.
To further illustrate the effect of HDR’s higher peak brightness on the viewing experience, take a look at how a lab publishes its method of measuring HDR peak brightness. RTINGS’ HDR brightness test methodology takes the measurement with local dimming enabled where the set has it, and weights three real-scene tests at 20% each against five white-window patterns that split the remaining 40%:
- Hallway Lights, where an ideal TV should reach roughly 1,950 cd/m² on the overhead lamps.
- Yellow Skyscraper, a night cityscape whose bright building should land near 700 cd/m².
- Landscape Pool, a daylight shot whose brightest patch should measure around 300 cd/m².
The lab’s own weighting indicates that the real scenes carry 60% of the score and the test patterns carry 40%, meaning that the patterns are a poorer correlate to how televisions will perform than the real scenes will be. Another trap within the same test suite is that peak and sustained brightness measurements are two distinct measurements; the peak brightness measurement is for HDR highlights which are designed to be short bursts, whereas sustained brightness will usually be reduced as long as a bright area stays on-screen for an extended period of time.
To help with rough calibration, Digital Trends ranked standard dynamic range televisions from 300 to 500 nits as of March 2025 and Business Insider’s updated HDR brightness tiers from May 2025 ranked the current televisions as approximately 400-700 nits at the entry level, 700-1,500 nits at the mid-level and 1,500-4,000 nits at the premium level. Business Insider also points out a significant budget consideration: If you want to maximize the impact of HDR, shoot for televisions that are capable of delivering peak brightness of at least 1,000 nits; however, there are televisions priced under $600 that still provide sufficient brightness (around 500-600 nits) to deliver a worthwhile HDR experience.
A peak figure with no window size, no scene and no dimming state attached isn’t a measurement. It’s a marketing number.
Contrast and local dimming: the hardware HDR depends on
A thread from 2021 on AVForums discussed whether budget televisions that include HDR in their advertising are deserving of the label or not, and within this thread one of the members illustrates his thoughts with an example. The member talked about two televisions that he has, an LCD with no local dimming in his son’s bedroom and an OLED in the living room. He stated that there was no visible difference in the HDR effect between the two televisions. A member with high reputations, responded directly to this member with a statement, “You can only see HDR on either an OLED or an LCD with local dimming.” He went on to say, “You cannot achieve the contrast levels needed for HDR without local dimming.”
On the measurement side, this claim is supported by the methodology used to measure brightness. The same laboratory that created the methodology for measuring brightness also uses Local Dimming ON while taking HDR readings for the same reasons. Without Local Dimming, or lower Peak Brightness, televisions do not appear as bright as when HDR is being viewed on a Local Dimming enabled display, and the darker areas tend to lose detail and appear to be more difficult to see due to the higher level of black.
The reasoning behind the claim of the difference between the two displays is not as glamorous and technical as one may believe. LCD televisions do not emit any light from their pixels, they only transmit light. In order for the entire panel to appear to be emitting light when viewing content, the backlight must be capable of illuminating the display enough to show the brightest pixel being displayed, while the other pixels must have their darkness limited to how dark a closed filter can make them. As you increase the brightness of the backlight in order to see the brightest pixel on the display, you are also increasing the brightness of the other pixels on the display, thus creating a gray area between the blacks and whites of the display when viewing HDR content.
Local dimming divides a display’s backlight into sections that can be controlled independently. Therefore, one area can be brightened while its adjacent area remains off or almost off. And that is the secret to local dimming. Roku’s published backlight rows show the ladder inside one lineup:
- Direct-lit LED — lamps behind the panel, no independent zone control.
- Full-array local dimming — the backlight divided into zones that dim separately.
- Mini-LED local dimming — smaller LEDs, so more zones fit in the same space and halos around bright objects shrink.
- Self-lit OLED — no backlight at all; each pixel makes its own light and switches off completely.
Most specifications on a product’s sheets do not contain a specification for how many zones, or sections, of backlighting the product will have; typically the type of backlighting will be included in the specifications but the actual zone number will not. Additionally, the zone count varies based on what size screen the user chooses to purchase for a particular model. Therefore, do not assume that the missing zone count from your specification sheet means there is a certain number of zones, as it cannot be accurately deducted from the zone count for any size chosen.
Brightness without dimming control gets you a brighter flat picture, not an HDR one.
HDR10, HDR10+, Dolby Vision, and HLG: what format support changes
This part of the specification sheet may appear to be a “quality ranking”, but they do not represent a quality ranking. The two formats differ in their level of detail/instruction regarding what the TV can do (in terms of providing light), and not how much light the respective formats can produce.
There are two layers of content with this specification sheet, and the layers do not have the same level of authority. The bottom layer is made up of standards created by neutral third-party organisations. An ITU-R Report (ITU-R Report BT.2390-7) provides guidance regarding the definitions/parameters for HDR TV and provides guidance as to HDR image parameters for both the PQ (perceived quality) and HLG (hybrid logarithmic gamma) signals. The top layer of the specification sheet includes a proprietary format licensed from Dolby Laboratories and a royalty-free industry programme; neither of these formats are approved by ITU or SMPTE. Dolby Laboratories does not publish its certification requirements in the same way as VESA does with DisplayHDR, therefore, the Dolby Vision logo is an indication of a licensing cost being paid, not a performance being certified.
| Format | Metadata | Who runs it | What support changes |
|---|---|---|---|
| HDR10 | Static — one instruction set per program | Open and royalty-free; its profile defined in CTA’s text | Nothing to add; every HDR set has it |
| HDR10+ | Dynamic — scene by scene | HDR10+ Technologies, royalty-free | Per-scene tone-mapping instructions |
| Dolby Vision | Dynamic — scene by scene, up to 12-bit | Dolby, proprietary and licensed | Per-scene instructions mapped to the display |
| HLG | Transfer function, no dynamic metadata | ITU-R BT.2100 | A broadcast signal that also works on SDR sets |
HDR10+’s format comparison describes the HDR10, HDR10+ and HDR10+ ADVANCED formats as the first through third generations of one open standard that has backwards and forwards compatibility built in. It also describes the price you pay for static metadata, which is an instruction set covering an entire programme based on a calculation of just the single brightest frame in the programme, and the dynamic metadata provides guidance on a scene by scene basis, and if your television only recognises HDR10, the HDR10+ disc or stream will play, but the TV simply ignores all the extra metadata it does not support and defaults to the original HDR10 static metadata.
Dolby Vision’s description of Dolby Vision makes similar architectural claims from the licensed perspective; it has a colour depth of 12 bits of dynamic metadata, which means that it provides a way to map images back to what your display is capable of showing. Think of the 12 bits of colour depth as being about the capability of the format, not about what any television has to deliver, and the “up to 40 times brighter” should be considered to be Dolby’s own marketing claim about this format, not information about a specific television’s measurements.
The same care should be used with bit depth, as HDR requires a 10-bit signal, but RTINGS has indicated that the vast majority of televisions still use 8-bit panels for most of the display; therefore, dithering is used to display a 10-bit signal. Therefore, if you want the full discussion for and against Dolby Vision, it would be better to read a separate article dedicated to that particular format, rather than include all of it in this paragraph.
HLG is different from other dynamic HDR formats because it does not include dynamic metadata and is designed to work with standard range televisions, which makes it great for live television. When it comes to HLG availability, the only way to know if you have it is to check with your broadcaster or service provider; do not just assume HLG is available in your area. Business Insider also states that the PS5 has some limitations with respect to dynamic metadata because the console only supports HDR10, while the Xbox Series X and S support Dolby Vision as well as HDR10.
If you are trying to save money when shopping for an HDR TV, Business Insider recommends that dynamic metadata will not have a huge impact on the overall viewing experience for most people, especially if they are watching the content on a lower quality or mid-range HDR television (those with limited range). Therefore, people with lower quality or mid-range HDR TVs will get the most benefits from having the dynamic metadata tell them where they should spend their “headroom” (in regards to colour space).
Format support changes how well a TV is instructed. It never changes how much light the panel can make.
When HDR looks worse than SDR: tone mapping, settings, and content
In a January 2018 post in AVForums, a user with an LG 49UJ634V indicated he had “purchased a product with HDR” and wanted to utilize it; yet, he also stated he was unable to create an acceptable image, after trying different settings, modes of operation, and calibrating the screen. Later in the same thread, he states that “the image looks dim” compared to SDR images. The response from one of the more senior members was direct: “Unfortunately, if you have a hardware-based issue, there’s little to no way of adjusting for it.”
The first thing to note is that part of what he perceived was correct and, in order to isolate that feature, we need to consider the difference. HDR encodes luminance information as absolute values instead of as a percentage of the brightness available via the TV’s backlight; therefore, an HDR image that has been reproduced correctly will appear less bright, on average, than an SDR image with increased brightness because the relative locations of the highlight versus mid-tone values have not changed since those values were set by the creator. The equivalent position made by RTINGS is that if you watch HDR in a very bright room, it is possible to find the overall image too dark.
The second reason we see different representations of HDR content between two TV manufacturers is that they each implement tone mapping differently for HDR content. Business Insider explains that since HDR10 content has a higher dynamic range than a television can actually produce, the display will have to downscale the highlight and colour values that were created by the content creator to be visible on the screen. Because the television makers will handle this process in different ways, it is not unusual to see variations in highlight and mid-tone brightness out of the same file when viewed on different televisions.
The third cause is the one you can actually fix, and it’s a signal-chain problem rather than a picture problem. Netflix’s own video-quality checklist lays out the order to check:
- Check the title’s label. Each title’s details page shows a resolution label and a dynamic-range label — Dolby Vision, HDR or HDR10+ — reflecting how it will play on the device you’re using.
- Check the plan. On Netflix’s US plan comparison, Premium is the plan listed with 4K (Ultra HD) + HDR; both Standard plans are listed at 1080p (Full HD).
- Check the port and the cable. Netflix says devices and cables need to be plugged into an HDMI port supporting HDCP 2.2 or later — usually HDMI 1 — and that its top quality tier needs Premium High Speed or Ultra High Speed HDMI cables.
- Check the app’s HDR switch. The Netflix app carries an HDR On/Off control, and some devices ship with it set to Off.
Once you complete those four steps, you’ll be able to tell if you actually saw HDR or not. Adding a nit or a dimming zone, however, is impossible. Assuming that all the labels are accurate, the plan is correct, the ports/cables are correct, and the switch is turned on, if the picture looks the same as before, then that means the ceiling must be the panel.
Settings fix a signal problem. They can’t fix a backlight.
How to check a TV’s real HDR capability before you buy
You can find answers to the four questions listed above by using publicly available information. You do not have to visit a dealership to see products under display-type lighting to find answers, however, you need a good understanding of what different types of published resources can provide you. For example, if you check out a manufacturer’s web site, it will indicate what type of parts are used (hardware), however the labs that publish their testing conditions will provide the most accurate and detailed information regarding how the hardware performs.
| Spec-sheet item | What it predicts | Where to verify it | What silence means |
|---|---|---|---|
| Measured HDR brightness | Whether highlights land as highlights | A lab’s real-scene result for that exact model and size, with the dimming state stated | A peak figure with no test condition has told you nothing |
| Contrast and black level | Whether dark scenes hold detail instead of graying | The same lab’s measured contrast for that model | Manufacturers rarely publish a comparable figure; absence isn’t a verdict |
| Backlight or panel type | Whether bright and dark can coexist on screen | The manufacturer’s spec table, which lists backlight as its own line | “LED” with no dimming language generally means no zone control |
| HDR format and bit depth | How well the TV gets instructed | The manufacturer’s spec table plus the format programs’ own pages | HDR10 alone is the floor; a missing dynamic-format logo isn’t a defect |
This checklist serves as a practical tool to determine if a display has met specific criteria (Measured Brightness, Contrast Ratio, Backlight Structure and Format & Bit Depth Support, etc.) based on criteria outlined within the context of this guide; it does not represent laboratory measurements nor certified ratings.
An important certification tool that you can refer to when deciding on a television purchase, but one that will not dictate your final decision, is VESA’s Certified Product List. The certified-product list organizes products into sections based on tier levels and allows users to confirm whether or not a monitor actually carries the DisplayHDR certification logo it claims — this can help if you are considering purchasing multiple monitors, and serves as another way to verify the legitimacy of faux-specification names. The certified-product list contains monitors, laptop panels, and professional displays; thus, you will not find televisions listed on the VESA Certified Product List, but their absence does not indicate anything about the quality of that television.
On a TV spec sheet, the most informative line is often the one that isn’t printed.
What Should You Look for in a 4K HDR TV?
The four-letter badge on the box is a decoding promise, and the picture you actually take home comes from brightness, contrast, backlight control and the content chain feeding them. Before you buy, open the manufacturer’s spec page for the exact model number and screen size you’re considering, read the backlight line, then look that same model up against a lab’s published HDR brightness test methodology to see what conditions produced the figure. Skip that and you’re buying a label; spend ten minutes on it and you’ll know, before checkout, whether HDR is going to change anything on your screen.
Frequently Asked Questions
Will an HDR TV make regular cable and broadcast channels look better?
Cable, satellite and over-the-air broadcasts are still predominantly standard dynamic range in terms of HDR. Therefore, when an HDR display is used to view a SDR broadcast, the broadcast will appear with just the SDR content along with all of the processing features that the display has been set to. The CTA’s definition for 4K includes upscaling resolution. However, the 4K resolution does not represent an increase in dynamic range that included in the signal.
Does an 8-bit panel mean a TV can’t really do HDR?
HDR is not supported by all televisions. The majority of televisions currently in production are capable of receiving a 10-bit signal, but according to RTINGS data, most televisions are using 8-bit panels (with the help of dithering) to display HDR content. RTINGS also noted there is minimal impact on the overall quality of HDR content displayed on an 8-bit display versus a 10-bit display. The bit depth of a panel is a poor predictor of the overall performance of HDR content when compared to factors such as brightness and dimming capability.
Does it matter that some brands skip Dolby Vision or HDR10+?
The logo strip is misleading, as demonstrated in the Business Insider’s brand-by-brand format breakdown that breaks down the major US television manufacturers into their own sections. The majority of television manufacturers have both Dynamic and HDR10-only versions of their television sets. The HDR10-only sets still play HDR10+ videos but do so by simply ignoring the additional metadata contained in the files. The difference between format types is a loss of tone-mapping assistance, not HDR itself.
Should I wait for HDR10+ ADVANCED?
Best guess: HDR10+ is NOT a budget feature. According to the HDR10+ program, Advanced has only one of the smallest three-generation jumps that HDR10+ is working toward, but HDR10+ emphasizes that it works best on the newer, brighter premium displays. Additionally, HDR10+ claims that full compatibility exists both backward and forward. In other words, a television/monitor/television set purchased today will work with these newer formats, not just those formats that existed at the time the television was purchased.
