Liquid-crystalline medium

An LC medium, comprising

• one or more compounds of the formula I-3-9 and/or I-3-10 in an amount of 1% to 40%,
• in which
• n and m independently from one another, denote an integer from 1 to 12;
• and
• 100 ppm to 1,000 ppm of compound H-10
• and
• one or more of the following compounds
• in which
• R3 is an alkyl radical having 1 to 15 C atoms, wherein one or more CH2 groups, including terminal C atoms, may each be replaced, independently of one another, by —C≡C—, —CH═CH—,
• —O—, —S—, —(CO)—O—, or —O—(CO)— in such a way that O or S atoms are not linked directly to one another, and in which one or more H atoms may be replaced by F or Cl, or H,
• on each appearance, independently of one another, are
• L31 and L32 independently of one another, denote H or F,
• L33 is H or CH3,
• X3 denotes halogen, halogenated alkyl or alkoxy having 1 to 3 C atoms or halogenated alkenyl or alkenyloxy having 2 or 3 C atoms,
• and
• n denotes 0, 1, 2 or 3;
• and
• wherein the LC medium has a positive dielectric anisotropy.