LCD Phone Screens Explained
LCD was the standard flat-screen technology for years, and it is still what separates a backlit phone screen from a self-lit OLED one. This page covers how an LCD works, the panel types you will see named on a spec sheet, what the backlight does, and where LCDs trade off against OLED. Every general claim comes from the sources listed at the bottom; the phone counts are ours.
How does an LCD show an image?
An LCD shows an image by letting light from a backlight pass through a layer of liquid crystals that each pixel can twist or untwist. Wikipedia says liquid crystals do not generate light independently, so the display needs a backlight or a reflector.
According to Wikipedia, each pixel is a layer of liquid crystal molecules between transparent electrodes (typically indium tin oxide) and two polarizing filters whose transmission axes are perpendicular. In a twisted nematic (TN) pixel, the molecules form a helix that rotates the polarized light; applying enough voltage untwists them and the pixel goes dark, while intermediate voltages produce shades of gray. The panel controls the light. It does not make any.
What are the main LCD panel types?
The three types Wikipedia describes are twisted nematic (TN), in-plane switching (IPS) and vertical alignment (VA), and they differ in cost, viewing angle and contrast.
| Panel type | Strengths | Weaknesses | Source |
|---|---|---|---|
| TN | Inexpensive, fast response times | Narrow viewing angles, gamma shift, limited color accuracy | Wikipedia: LCD |
| IPS | Wider viewing angles, better color reproduction | Needs two transistors per pixel; compared with TN may use more power, cost more and respond more slowly | Wikipedia: LCD and IPS panel |
| VA | Deeper blacks and higher contrast than TN, cheaper than IPS | Narrower viewing angles than IPS | Wikipedia: LCD |
Wikipedia’s LCD article says IPS is used in most modern smartphones. Motorola’s page for the Moto G Power (2026) lists the display as an LCD and does not name the panel type, so we do not label it.
What does the backlight do?
The backlight is the light source that makes an LCD visible, and its quality and dimming method affect brightness, contrast and flicker. Wikipedia says LEDs are the dominant modern backlight and that backlights are commonly used in smartphones.
Wikipedia describes two common layouts. An edge-lit design puts LEDs at the panel edges with a light guide spreading the light, which keeps the screen thin and the cost low. A full-array design puts many LEDs behind the panel, which allows local dimming, where parts of the backlight darken to make black areas of the picture darker. Wikipedia’s LCD article says mini-LED backlights can support 1,000 or more local dimming zones for deeper blacks.
Brightness is often adjusted with pulse-width modulation (PWM), which switches the backlight on and off rapidly and varies how long it stays on. Wikipedia says the PWM frequency can run from several kilohertz down to as little as 180 Hz, and that low frequencies can cause discomfort similar to flicker on old CRT monitors. Wikipedia’s OLED article says many OLEDs use PWM as well, so flicker is not an LCD-only topic.
Why are LCD blacks not fully black?
LCD blacks are not fully black because individual liquid crystals cannot completely block all of the backlight. Wikipedia lists this under disadvantages, and it limits contrast: the ratio between the brightest and darkest a pixel can be.
Wikipedia gives a television example of the gap between panel and marketing figures. It says the panel itself provides about 1,000:1 contrast, while a dynamic backlight control can produce a marketing figure of 30,000:1. That is a TV example, not a phone measurement, and it shows why a quoted contrast ratio needs its test conditions. In an OLED, Wikipedia says individual pixels produce true black when they are off, so contrast can be very large.
Where do LCDs fall short, and where do they hold up?
LCDs fall short on black level, motion and viewing angle in cheaper panels, but they avoid some OLED problems. The comparison below draws only on the cited sources.
| Topic | LCD | OLED | Source |
|---|---|---|---|
| Black level | Backlight leaks through; black is slightly lit | Off pixels give no light | Wikipedia: LCD and OLED |
| Response time | Wikipedia says response above 8 ms causes motion blur | Wikipedia says OLED response is up to 1,000 times faster than LCD | Wikipedia: LCD and OLED |
| Burn-in | Listed as a disadvantage, not always permanent | OLEDs may be more susceptible than LCDs | Wikipedia: LCD and OLED |
| White-screen power | Wikipedia’s dark mode article says conventional LED-lit displays may not benefit from dark backgrounds | Wikipedia says an OLED can use more than 300% power for a white background | Wikipedia: OLED and Dark mode |
| Bright ambient light | No equivalent weakness in Wikipedia’s list | Wikipedia says the metallic cathode acts as a mirror, with reflectance approaching 80% | Wikipedia: OLED |
Two cautions. First, burn-in is not an OLED-only problem in the evidence we have: RTINGS, reported by Tom’s Hardware, found uneven-brightness degradation on every LCD TV in its ten-month test, which it described as far more severe than what the OLED TVs showed in the same testing. Those were TVs under constant maximum-brightness use, not phones. Second, these are general limits. Wikipedia itself says viewing-angle limits are listed for some older or cheaper monitors, and phone-grade LCDs vary.
Which phones in our library use an LCD?
One of 41. The Moto G Power (2026) is the only phone in our library whose page lists an LCD. Motorola lists a 6.8-inch Full HD+ LCD with a 120Hz refresh rate and a High Brightness Mode of up to 1,000 nits. The other 40 pages list OLED (36 phones) or LTPO OLED (4 phones). These counts describe our library of 41 phones, not the phone market, and they say nothing about which screen is better for you. See the Moto G Power (2026) page for its full specifications.
Which should I pick?
Pick by the phone’s own spec page and by what you use the screen for, not by the panel name alone. If you watch dark video in dim rooms, black level matters more. If you worry about static interface elements, the burn-in evidence above is worth reading in full. Check the phone library for each phone’s listed panel, then read how OLED, LTPO OLED and refresh rates differ. If a cracked screen is the reason you are reading, see screen replacement basics.
Related
Screens hub, OLED explained, LTPO OLED, refresh rates, phone library, guides.