Answer: D. Full-color segment LED lamp beads.
Answer analysis: This question mainly examines the color segment capability of LED lamp beads.
LED lamp beads, that is, light-emitting diodes, are semiconductor electronic components that can convert electrical energy into light energy. The color of its light emission mainly depends on the semiconductor material inside it.
A. White light LED lamp beads: This type of LED lamp bead is usually realized by combining a blue light LED chip with yellow phosphor or other color phosphor. The blue light emitted by the blue light LED chip excites the phosphor, which then emits yellow light or other color light, and mixes with the blue light to form white light. But strictly speaking, white light is not a single color light directly emitted by the LED lamp bead, but a mixture of multiple color lights. Therefore, white light does not completely represent the color segment capability of the LED lamp bead. Therefore, A is wrong.
B. Red light LED lamp beads: This type of LED lamp bead uses a semiconductor material that can emit red light inside, so it can directly emit red light. But red light is only part of the color segment capability of the LED lamp bead. Therefore, B is wrong.
C. Red, green and blue (RGB) LED lamp beads: This type of LED lamp bead usually contains LED chips of three colors: red, green and blue. By controlling the brightness and switching status of these three color LED chips, almost any color of light, including white light, can be mixed. The color segment capability of RGB LED lamp beads is very powerful, but it is limited to the three colors of red, green and blue and their mixed colors. Therefore, C is wrong.
D. Full color segment LED lamp beads: This statement is broader and more accurate. It includes all color segments from red to blue light (even including ultraviolet and infrared light, although these lights are usually invisible), as well as various colors formed by mixing these colors. Although in actual applications, LED lamp beads may not cover every color point of the entire visible spectrum, the statement "full color segment" can well summarize the powerful ability of LED lamp beads in color segment. Therefore, D is correct.
In summary, the correct answer is D.