Liquid crystal display using different light radiation angles of light emitting diodes

A liquid crystal display, comprising:

• a thin film transistor panel having a first substrate and a second substrate larger than the first substrate with circuitry unit area where a thin film transistor driving circuit is mounted,
• a plurality of light emitting diodes (LEDs) each having a respective light radiation angle that is defined by a limited light emitting range of that LED;
• said plural light emitting diodes including a first light emitting diode and a second light emitting diode providing light to the thin film transistor panel, the first and second light emitting diodes respectively having a first light radiation angle and a second light radiation angle, where the second light radiation angle is larger than the first light radiation angle, and
• a light guiding plate next to the first and second light emitting diodes to propagate light from the first and second light emitting diodes and disposed under the thin film transistor panel,
• wherein the light guiding plate has a light receiving surface having a major surface portion and a cutaway minor surface portion disposed at an edge of the major surface portion of the light receiving surface, the cutaway minor surface portion being slanted relative to the major surface portion, and has a dark area and an active light emitting area,
• wherein the circuitry unit overlaps the first and second light emitting diodes, wherein the first light emitting diode faces in a substantially paralleling manner the major surface portion, and wherein the second light emitting diode faces in a substantially paralleling manner the cutaway minor surface portion.

A method for making a backlight assembly, the method comprising:

• providing a plurality of light emitting diodes (LEDs) each having a respective light radiation angle that is defined by a limited light emitting range of that LED;
• facing a first of the light emitting diodes toward a first point on an incident light receiving surface of a light guiding plate,
• wherein the incident light receiving surface has a major surface portion and one or more cutaway minor surface portions each disposed at an edge of the major surface portion of the incident light receiving surface, the cutaway minor surface portions each being slanted relative to the major surface portion,
• wherein the first light emitting diode is structured to respectively have a first light radiation angle;
• and
• facing a second of the light emitting diodes toward a second point on the incident light receiving surface, wherein the second light emitting diode is structured to respectively have a second light radiation angle larger than the first light radiation angle,
• wherein the second point is on one of the cutaway minor surface portions of the incident light receiving surface;
• and wherein the light guiding plate has a dark area and an active light emitting area.