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Driving method of dynamic driving field-sequential color liquid crystal display

A liquid crystal display, field sequential color technology, used in static indicators, instruments, etc., to achieve the effect of improving consistency, reducing minimum frequency, improving purity and uniformity of brightness

Inactive Publication Date: 2013-02-13
深圳赛科显示器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If you use this type of display with other duty ratios, such as 1 / 3, 1 / 4, 1 / 8, ... 1 / N, the same problem exists

Method used

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  • Driving method of dynamic driving field-sequential color liquid crystal display
  • Driving method of dynamic driving field-sequential color liquid crystal display
  • Driving method of dynamic driving field-sequential color liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0040] Please refer to FIG. 1A . FIG. 1A is a schematic diagram of the principle of the driving waveform of the present invention when the B waveform is driven with a 1 / 4 duty cycle. In this embodiment, a TN-type liquid crystal display in positive display mode is adopted, the bias voltage is 1 / 3, and the OFF response time of the liquid crystal is 10 milliseconds. It uses LED backlights of two different colors (red, cyan) to drive with a 1 / 4 duty cycle, and the actual number of COMs is 4; in the same field (the same color in the same field, the same below) Each COM is scanned twice in sequence and the polarity is reversed once. The frame rate is variable from 40Hz to 60Hz. The non-scanning time is variable between 0 milliseconds and 11 milliseconds, the actual voltage applied to the liquid crystal pixel during the non-scanning time is variable from 0V to OFF voltage (OFF voltage is 2V), and the respective COM and SEG voltages are variable during the non-scanning time The posi...

Embodiment 2

[0045] Embodiment 2 (not drawing)

[0046] The present invention uses a 1 / 8 duty cycle driven B waveform as a positive display driving waveform, adopts a positive display mode TN type liquid crystal display, the bias voltage is 1 / 4, and the OFF response time of the liquid crystal is 6 milliseconds. It uses LED backlights of three different colors (R, G, B), driven with a 1 / 8 duty cycle, and the actual number of COMs is 8; each COM in the same field is scanned twice sequentially and Positive and negative polarity reversed once. The frame rate is set at 50Hz. The non-scanning time is variable between 0 milliseconds and 6 milliseconds, the actual voltage applied to the liquid crystal pixels during the non-scanning time is 0V, and the backlight is continuously on.

[0047] When the frame frequency is set to 50Hz, the three color fields occupy 6.67 milliseconds respectively. We make all the LCD pixels display red. When we set the non-scanning time to 0 milliseconds, we find that ...

Embodiment 3

[0049] Please refer to FIG. 1 . FIG. 1 is a schematic diagram of the principle of driving waveforms of the B waveform positive display driven by a 1 / 2 duty cycle in the present invention. The dotted line in the figure is the amount of light leakage. In the present invention, only schematic areas of light leakage are drawn in FIG. 1T and FIG. 10 , and relevant parts in other drawings also have light leakage, which can be deduced by analogy.

[0050] In this embodiment, a TN-type liquid crystal display in positive display mode is adopted, the bias voltage is 1 / 2, and the OFF response time of the liquid crystal is 3 milliseconds. It uses LED backlights of three different colors (R, G, B), driven with a 1 / 2 duty cycle, and the actual number of COMs is 2; each COM in the same field is scanned twice sequentially and Positive and negative polarity reversed once. The frame rate is 60Hz. When the non-scanning time is between 0 milliseconds and 4 milliseconds, the actual voltage appl...

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Abstract

The invention relates to a driving method of a dynamic driving field-sequential color liquid crystal display. In a passive array dynamic driving field-sequential color liquid crystal display of which the backlight source at least comprises two or more than two colors, each field comprises the scanning time and the non-scanning time of a COM (Component Object Model), during the scanning time, all liquid crystal pixels are driven by each COM according to a canning process in a certain sequence. The non-scanning time means the time when the liquid crystal pixels are not driven and the backlight source is lightened continuously, and the non-scanning time is between 1 microsecond and 10 microseconds. The invention has the advantage that all the liquid crystal pixels have almost identical display color and uniform color purity and brightness in the same field.

Description

technical field [0001] The invention relates to a driving method for a passive matrix dynamic driving field sequence color liquid crystal display. Background technique [0002] Field-sequential color liquid crystal display usually divides a color picture (frame) into three pictures (fields) of red (R), green (G) and blue (B) sequentially in time, and then switches those pictures sequentially at high speed (fields) constitute a color picture (frame). If the three primary colors of R, G, and B are used, the display time of each site is 1 / 3 of the display time of a frame, that is, three fields constitute a frame period. If it is 2-color or 4-color, the display time of each site is 1 / 2 or 1 / 4 of the display time of a frame period, that is, 2 fields or 4 fields constitute a frame period, and the rest are analogous. On the other hand, the driving methods of liquid crystal displays are mainly divided into two modes: active matrix driving and passive matrix (or simple matrix) driv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
Inventor 陈国平
Owner 深圳赛科显示器有限公司