An LED TV is usually an LCD television lit by light-emitting diodes behind or around its screen. The LEDs provide the light; the LCD layer controls how much of it passes through each part of the picture, and color filters create the colors. That distinction explains why an ordinary LED TV does not have a separate self-lit LED for every pixel—and why backlight design matters when comparing models.
What is an LED TV?
In everyday television listings, “LED TV” generally means an LED-backlit LCD TV. LCD and LED are not competing display categories in this usage: LCD describes the image-forming panel, while LED describes its light source. The LCD layer modulates the backlight to form the picture, with color filters producing its colors. The LEDs illuminate the panel; they are not individual red, green, and blue picture pixels. Samsung’s explanation of LED, OLED, and QLED and Sharp’s overview of TV backlighting describe this conventional distinction.
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What is the backlight on a TV?
The backlight is the light source behind an LCD image. Because the LCD panel does not generate the image’s light by itself, the arrangement and control of the LEDs affect how evenly the screen is lit and how dark scenes look. Manufacturers use several backlight layouts; a broad label does not reveal every model’s performance.
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Edge-lit TVs place LEDs along the screen’s edges. A light guide spreads their light across the panel. This describes where the light starts, not a guarantee of uniform brightness or picture quality.
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- DTS Virtual-X Sound - An immersive sound format creates a three-dimensional sound experience with your TV’s speakers.
- Supports HDMI ARC - Sends audio directly from the HDMI jack to a compatible soundbar or AV receiver, removing the need for an extra cable.
Direct-lit
Direct-lit models position LEDs behind the panel. The term alone does not establish whether the television can dim separate areas of that backlight.
Full-array and local dimming
A full-array layout uses LEDs across the rear of the panel. In a full-array local-dimming system, the TV controls groups of backlight LEDs in zones: it can reduce light in darker areas while keeping other areas brighter. This can improve perceived black levels and make bright highlights stand out against dark scenes.
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A zone covers multiple picture pixels, however. When a small bright object—such as white subtitles—appears on a dark background, light from its zone may spill into nearby dark areas. This visible halo is called blooming. How noticeable it is depends on the particular TV’s hardware, processing, and content. Sony’s overview of backlighting systems explains the system categories; the label alone does not state a model’s zone count, uniformity, or results.
How LED LCD differs from OLED and QLED
| Type | How it makes the picture | What the name tells you |
|---|---|---|
| LED TV (LED-backlit LCD) | LEDs illuminate an LCD panel; the LCD layer shapes the light and color filters produce color. | “LED” ordinarily refers to the backlight, not individually self-emissive picture pixels. |
| OLED | Pixels emit their own light and can switch off individually; there is no separate backlight. | It uses a different display structure from LED-backlit LCD. |
| QLED | Samsung describes QLED as an LED-backlit LCD design with an additional quantum-dot layer. | It remains an LCD/backlight design, not a synonym for OLED. |
These are structural distinctions, not a universal quality ranking. The terms do not, by themselves, establish which model will be brighter, more efficient, or preferable for a particular room or viewer. Samsung’s technology guide provides its description of QLED and the comparison with OLED.
Rank #3
- 1080p resolution - View your favorite movies, shows and games in full high definition.
- Alexa voice control - The Alexa Voice Remote lets you easily control your entertainment, search across apps, switch inputs, and more using just your voice. Press and hold the voice button and ask Alexa to easily find, launch, and control content, and even switch to cable.
- Access thousands of shows with Fire TV - Watch over 1.5 million streaming movies and TV episodes with access to thousands of channels, apps and Alexa skills, including Prime Video, Netflix, Hulu, HBO Max, YouTube, Apple TV+, Disney+, ESPN+, Sling TV, Paramount+, and other services right from this TV.*
- DTS Virtual-X Sound - An immersive sound format creates a three-dimensional sound experience with your TV’s speakers.
- Supports HDMI ARC - Sends audio directly from the HDMI jack to a compatible soundbar or AV receiver, removing the need for an extra cable.
What to compare when choosing a TV
Start with the actual model’s specifications rather than relying on a technology label. ENERGY STAR’s consumer guide to televisions identifies resolution, HDR formats, smart-TV support, refresh rate, viewing distance, and HDMI inputs as considerations. Which features matter depends on your room, content, devices, and budget.
- Backlight and dimming: Check whether the model is edge-lit, direct-lit, or full-array, and whether it has local dimming. Look for model-level details; the category name does not establish zone count or how blooming will appear in your viewing.
- Room and viewing: Consider screen size, viewing distance, the brightness you need, and whether automatic brightness control suits your room and habits.
- Picture features: Check resolution, supported HDR formats, and refresh rate against the content and devices you use.
- Connections and smart features: Confirm that the TV has enough HDMI inputs for your devices and supports the smart-TV features you want.
- Energy use: Compare model-specific rated energy use or certification, then consider your viewing hours, standby time, picture settings, and local electricity price. A technology label alone cannot predict your bill.
How settings and use affect energy consumption
The U.S. Department of Energy says LED LCD screens tend to be among the more energy-efficient television types in its guidance and recommends considering local dimming and automatic brightness control. Actual consumption still varies with the model, screen size, settings, hours watched, standby behavior, and electricity price. The agency notes that the default picture setting is used to earn the ENERGY STAR label; switching to vivid or another brighter preset can affect energy consumption. See the Department of Energy’s television purchasing guidance.
The same DOE guidance, updated in December 2024, gives a dated U.S. illustration for a 54.5-inch TV: its ENERGY STAR example uses 168 kWh per year, compared with 235 kWh for a less-efficient example. The agency calculated that a purchase premium of no more than $31 in 2023 dollars would be offset over five years under its assumptions: 1,825 active hours and 6,935 standby hours annually, and electricity at 11 cents per kWh based on federal facility prices as of July 2024. This is an agency scenario, not a current estimate for every household; your costs depend on your own usage and electricity rate.
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