This application claims the priority benefit of Taiwan application serial no. 97109140, filed Mar. 14, 2008. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
1. Field of the Invention
The present invention generally relates to a color-sequential display, and more particularly, to a method for driving a color-sequential display suitable to reduce color break-up phenomenon.
2. Description of Related Art
Along with the developments of photoelectric and semiconductor technologies, the flat display industry has had flourishing progresses. Among numerous flat displays, liquid crystal display (LCD) has played a major role in the mainstream display market due to advantages of high space-utilization, low power consumption, no radiation and low electromagnetic interference thereof. An LCD usually includes an LCD panel and a backlight module. Since an LCD panel itself has no illuminant function, a backlight module needs to be disposed to provide a light source required by the LCD panel, which further enables the LCD panel to display.
A conventional backlight module of an LCD provides white light only. A set of color filters is disposed at the position of each pixel, so that the white backlight can make each pixel display different colors. In general, three color filters composing red color one (R), green color one (G) and blue color one (B) are disposed at the position of each pixel. The said technology by using color filters not only requires high cost and has low optical transmittance with each pixel where a specific color light is obtained after the color filters filter the white light emitted by the white backlight, but also has a color-blending problem. The color-blending occurs at the boundaries between the three color filters. Also a conventional solution that black matrixes are disposed at the boundaries to separate the three color filters can reduce the color-blending problem, but it brings a lower optical transmittance of the color filters.
As a state of art LCD design, the LCD is a color-filter-less one by design. The display technology herein is changed to sequentially display red color, green color and blue color within a frame period as the substitute of the prior art where the red, green and blue colors are simultaneously displayed. In association with the said color sequential method, in terms of the LCD panel structure, a regular backlight source is substituted by a light-emitting diode backlight source (LED backlight source) to facilitate a color-blending in time domain (a color-blending effect produced by quickly switching three color images, i.e. R image, G image and B image on time domain, within the duration of persistence of human eye's vision). The said technology does not need color filters; therefore, it promotes the optical transmittance of each pixel displaying.
Although the above-described technology is able to increase aperture ratio and the display brightness, but it likely causes color break-up with a dynamic image due to the limitation of persistence of human eye's vision.
Accordingly, the present invention is directed to a method for driving a color-sequential display suitable to reduce color break-up of the color-sequential display.
The present invention provides a method for driving a color-sequential display. The method includes: dividing each sub-frame period into a data-writing period and a backlight turned-on period; transmitting a data of a first color within the data-writing period; turning on a first color backlight during a first duration of the backlight turned-on period; and turning on a second color backlight during a second duration of the backlight turned-on period.
According to the method for driving a color-sequential display provided by an embodiment of the present invention, a frame period comprises three sub-frame periods. Within the data-writing period of a first sub-frame period, a data of red color is transmitted; during the second duration of the backlight turned-on period, a white backlight is turned on; during the first duration of the backlight turned-on period, a red backlight is turned on, wherein the second duration is prior to the first duration in the first sub-frame period. Then, within the data-writing period of a second sub-frame period, a data of green color is transmitted; during the second duration of the backlight turned-on period, the white backlight is turned on; during the first duration of the backlight turned-on period, a green backlight is turned on, wherein the second duration is arranged at the middle of the first duration in the second sub-frame period. Further, within the data-writing period of a third sub-frame period, a data of blue color is transmitted; during the second duration of the backlight turned-on period, the white backlight is turned on; and during the first duration of the backlight turned-on period, a blue backlight is turned on, wherein the second duration is after the first duration in the third sub-frame period.
According to the method for driving a color-sequential display provided by an embodiment of the present invention, a frame period comprises three sub-frame periods. Within the data-writing period of a first sub-frame period, a data of red color is transmitted; during the second duration of the backlight turned-on period, a green backlight and a red backlight are turned on; during a third duration of the backlight turned-on period, a blue backlight and the red backlight are turned on; and during the first duration of the backlight turned-on period, the red backlight is turned on, wherein the second duration is prior to both the first duration and the third duration and the third duration is prior to the first duration in the first sub-frame period. Then, within the data-writing period of a second sub-frame period, a data of green color is transmitted; during the second duration of the backlight turned-on period, the green backlight and the blue backlight are turned on; during a third duration of the backlight turned-on period, the red backlight and the green backlight are turned on, and during the first duration of the backlight turned-on period, the green backlight is turned on, wherein the second duration is prior to both the first duration and the third duration and the third duration is after the first duration in the second sub-frame period. Further, within the data-writing period of a third sub-frame period, a data of blue color is transmitted; during the second duration of the backlight turned-on period, the green backlight and the blue backlight are turned on; during a third duration of the backlight turned-on period, the blue backlight and the red backlight are turned on; during the first duration of the backlight turned-on period, the blue backlight is turned on, wherein both the second duration and the third duration are after the first duration and the third duration is after the second duration in the third sub-frame period.
According to the method for driving a color-sequential display provided by an embodiment of the present invention, a frame period comprises three sub-frame periods. Within the data-writing period of a first sub-frame period, a data of red color is transmitted; during the second duration of the backlight turned-on period, a red backlight, a green backlight and a blue backlight are turned on; and during the first duration of the backlight turned-on period, the red backlight is turned on, wherein the second duration is prior to the first duration in the first sub-frame period. Then, within the data-writing period of a second sub-frame period, a data of green color is transmitted; during the second duration of the backlight turned-on period, the red backlight, the green backlight and the blue backlight are turned on; and during the first duration of the backlight turned-on period, the green backlight is turned on, wherein the second duration is arranged at the middle of the first duration in the second sub-frame period. Further, within the data-writing period of a third sub-frame period, a data of blue color is transmitted; during the second duration of the backlight turned-on period, the red backlight, the green backlight and the blue backlight are turned on; and during the first duration of the backlight turned-on period, the blue backlight is turned on, wherein the second duration is after the first duration in the third sub-frame period.
According to the method for driving a color-sequential display provided by an embodiment of the present invention, a frame period comprises three sub-frame periods. Within the data-writing period of a first sub-frame period, a data of red color is transmitted; during the second duration of the backlight turned-on period, a white backlight is turned on; and during the first duration of the backlight turned-on period, a red backlight is turned on, wherein the second duration and the first duration are overlapped by each other in the first sub-frame period. Then, within the data-writing period of a second sub-frame period, a data of green color is transmitted; during the second duration of the backlight turned-on period, the white backlight is turned on; and during the first duration of the backlight turned-on period, a green backlight is turned on, wherein the second duration and the first duration are overlapped by each other in the first sub-frame period. Further, within the data-writing period of a third sub-frame period, a data of blue color is transmitted; during the second duration of the backlight turned-on period, the white backlight is turned on; and during the first duration of the backlight turned-on period, a blue backlight is turned on, wherein the second duration and the first duration are overlapped by each other and the brightness of the white backlight is respectively smaller than the red backlight, the green backlight and the blue backlight in the first sub-frame period.
Since during keeping a backlight in a color corresponding to the color of the displayed data turned on, a plurality of other backlight in different colors from the color of the displayed data is turned on to add different colors; therefore, the present invention can reduce the color break-up phenomenon with dynamic images.
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
Similarly, within the data-writing period 221 of the second sub-frame period 22, a data of green color is transmitted to each pixel by the source driver. Within the backlight turned-on period 222 of the second sub-frame period 22, the green backlight is turned on first; then, the red backlight and the blue backlight are turned on during a predetermined time length at the middle of backlight turned-on period 222; after that, the green backlight keeps turned on and the red backlight and the blue backlight are turned off Further, within the data-writing period 231 of the third sub-frame period 23, a data of blue color is transmitted to each pixel by the source driver. Within the backlight turned-on period 232 of the third sub-frame period 23, the blue backlight is turned on first; then, the red backlight and the green backlight are turned on during a final predetermined time length.
Since the red backlight, the green backlight and the blue backlight are simultaneously turned on according to the above-described embodiment, which is equivalent to that a white light is added during displaying a data in a specific color (R, G or B); therefore, the innovative technology can reduce the color break-up phenomenon likely occurring in the prior art.
Similarly, within the data-writing period 221 of the second sub-frame period 22, a data of green color is transmitted to each pixel by the source driver. Within the backlight turned-on period 222 of the second sub-frame period 22, the green backlight and the blue backlight are turned on for a predetermined time length; then, only the green backlight keeps turned on and the blue backlight is turned off; finally, the red backlight is turned on. Further, within the data-writing period 231 of the third sub-frame period 23, a data of blue color is transmitted to each pixel by the source driver. Within the backlight turned-on period 232 of the third sub-frame period 23, the blue backlight is turned on for a predetermined time length first; then, the green backlight is turned on; after a final predetermined time length, the green backlight is turned off and the blue backlight keeps turned on, and the red backlight is turned on.
It seems that the fourth embodiment takes an operation principle different from that of the first, second and third embodiments, but in fact, the fourth embodiment is based on the same principle where a white light is added during displaying a data in a specific color (R, G or B). However, the added white light is blended on time domain. In other words, three color backlights are sequentially turned on so as to obtain a white light visual effect. In this way, the fourth embodiment achieves the same effect as the previous three embodiments as well.
Based on the above-described four embodiments, a flowchart of the method for driving a color-sequential display can be extracted.
In the above-described embodiments, the sequence between the first duration and the second duration is not specially limited, and the embodiments do not define the first duration and the second duration are overlapped by each other or not. In terms of the first sub-frame period 21 of the first embodiment, the first color herein is the red color and the second color is green color or the blue color, and the second duration is just the preset time length to display green color and the blue color and the first duration is just the entire backlight-turned on period to display the red color. In terms of the first sub-frame period 21 of the third embodiment, the first color is the red color, the second color is the white color, and the first duration and the second duration are overlapped by each other. In short, the present invention is not limit thereto in this regard.
In summary, since during keeping a backlight in a color corresponding to the color of the displayed data turned on, a plurality of other backlight in different colors from the color of the displayed data is added and turned on; therefore, the present invention can reduce the color break-up phenomenon with dynamic images.
It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
Number | Date | Country | Kind |
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97109140 | Mar 2008 | TW | national |