Liquid crystal display apparatus and method of driving

• US 7,796,114 B2
• Filed: 04/09/2007
• Issued: 09/14/2010
• Est. Priority Date: 04/25/2006
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jun, Tae-Jong, Han, Jung-Suk, Lee, Joo-Young, Lee, Jong-Seo, Shin, Seong-Sik
• Primary Examiner(s): Abdulselam; Abbas I
• Application Number:
  US11/697,999
• Publication Number:
  US 20070247560A1
• Time in Patent Office: 1,254 Days
• Field of Search: 345/82, 345/87, 345/94, 345/96, 345/102, 345/103, 349/43, 349/44, 349/46, 362/561, 362/612, 362/613, 438/149
• US Class Current: 345/102
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133622 Colour sequential illumination
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources

Abstract

A liquid crystal display (LCD) apparatus includes an LCD panel and light-emitting units. The light-emitting units generate lights in a corresponding light-emitting interval to illuminate a part of the LCD panel corresponding to the light-emitting units. A light-emitting ending point of the light-emitting interval is disposed between a first maximum light-transmitting time of a first region of the part of the LCD panel and a second maximum light-transmitting time of a second region of the part of the LCD panel, the first region corresponding to the first gate line of gate lines belonging to the part of the LCD panel illuminated by the light-emitting unit and the second region corresponding to the last gate line of the gate lines.

Claims

1. A liquid crystal display (LCD) apparatus comprising:

an LCD panel including a plurality of gate lines and a plurality of data lines crossing a plurality of the gate lines; and

a plurality of light-emitting units each respectively generating lights in a light-emitting interval to illuminate a part of the LCD panel,

wherein a light-emitting ending point of the light-emitting interval is disposed between a first maximum light-transmitting time of a first region of the part of the LCD panel and a second maximum light-transmitting time of a second region of the part of the LCD panel, the first region corresponding to the first gate line of the plurality of gate lines belonging to the part of the LCD panel illuminated by the light-emitting unit and the second region corresponding to the last gate line of the plurality of gate lines.

2. The LCD apparatus of claim 1, wherein the LCD panel comprising:

a first substrate including the gate lines and the data lines;

a second substrate facing the first substrate; and

a liquid crystal disposed between the first and second substrates, the liquid crystal adjusting light-transmittance of light provided from the light-emitting units.

3. The LCD apparatus of claim 2, wherein the liquid crystal is driven by a potential difference between voltages applied to the first substrate and the second substrate and has a light-transmittance response waveform gradually increasing from an initial driving time to an ending driving time.

4. The LCD apparatus of claim 3, wherein the light-transmittance response waveform of the liquid crystal is sequentially delayed from the first gate line to the last gate line by a constant time.

5. The LCD apparatus of claim 4, wherein the light-transmittance response waveform corresponding to the first gate line has a first peak in the first maximum light-transmitting time and the light-transmittance response waveform corresponding to the last gate line has a second peak in the second maximum light-transmitting time.

6. The LCD apparatus of claim 5, wherein each of the light-emitting unit sequentially generates different colored light in each of the corresponding light-emitting intervals.

7. The LCD apparatus of claim 6, wherein the light-emitting ending point of the light-emitting interval is delayed from the first maximum light-transmitting time by about 0.15 ms to about 0.17 ms.

8. The LCD apparatus of claim 7, wherein a delay time between the first maximum light-transmitting time and the second maximum light-transmitting time is in a range of about 0.52 ms to about 0.53 ms.

9. The LCD apparatus of claim 8, wherein eight light-emitting units are disposed such that a longitudinal direction of the light-emitting units is substantially parallel to the gate lines.

10. The LCD apparatus of claim 5, wherein each of the light-emitting units sequentially generates at least red light, green light and blue light in each of the corresponding light-emitting intervals, respectively.

11. The LCD apparatus of claim 5, wherein each of the light-emitting units includes a red light-emitting diode, a green light-emitting diode and a blue light-emitting diode.

12. A method of driving an LCD apparatus having a plurality of light-emitting units,

wherein each of the light-emitting units generates lights in a corresponding light-emitting interval to illuminate a part of an LCD panel corresponding to a particular light-emitting unit, and a light-emitting ending point of the light-emitting interval is disposed between a first maximum light-transmitting time of a first region of the part of the LCD panel and a second maximum light-transmitting time of a second region of the part of the LCD panel, the first region corresponding to a first gate line of a plurality of gate lines belonging to the part of the LCD panel illuminated by the particular light-emitting unit, and the second region corresponding to a last gate line of the plurality of gate lines.

13. The method of claim 12, wherein each of the light-emitting unit generates red light, green light and blue light in each corresponding light-emitting interval.

14. The method of claim 13, wherein the light-emitting units are disposed such that a longitudinal direction of the light-emitting units are substantially parallel to the gate lines, and the light-emitting units are driven so that the light-emitting ending point of each of the light-emitting intervals is delayed from the first maximum light-transmitting time by about 0.15 ms to about 0.17 ms.

15. The method of claim 12, wherein each of the light-emitting units sequentially generates red light, green light and blue light in each corresponding light-emitting interval.

16. The method of claim 12 wherein the light-emitting interval is determined so that an integral value of light-transmittance response waveforms multiplied by light-emitting signals of light-emitting unit is maximized.

17. A method of driving an LCD apparatus having a plurality of light-emitting units,

wherein each of the light-emitting units generates light in a corresponding light-emitting interval to illuminate a part of a LCD panel corresponding to the light-emitting unit, wherein a starting point and an ending point of the light-emitting interval is set up so that a sum of integral values calculated by integrating light-transmittance response waveforms respectively corresponding from a first gate line of a plurality of gate lines to a last gate line of the plurality of gate lines of the part of the LCD panel multiplied by a light-emitting signal waveform for an integration interval of the light-emitting interval.

18. The method of claim 17, wherein the ending point of the light-emitting interval is disposed between a first peak of the light-transmittance response waveform corresponding to the first gate line of plurality of gate lines belonging to the part of the LCD panel corresponding to the light-emitting unit and a second peak of the light-transmittance response waveform corresponding to the last gate line of the plurality of gate lines.

19. The method of claim 18, wherein the light-emitting units are driven so that the light-emitting ending point of the light-emitting interval is delayed from the first maximum light-transmitting time by a delay time in a range of about 0.15 ms to about 0.17 ms.