TWI442372B - Field sequential color-optically compensated bend mode lcd device - Google Patents

Description

Field sequential-optical compensation curved alignment mode liquid crystal display

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a liquid crystal display, and more particularly to a liquid crystal display having a field-sequential-optical compensation curved alignment mode having polarity inversion characteristics in different time periods.

The current field sequential-optical compensation curved alignment mode liquid crystal display has a number of advantages: (1) Since the color filter is not required, the process of color photoresist coating and development is omitted on the liquid crystal cell upper plate process. It only needs to make a Black Matrix (BM). (2) Reduce the Cycle Time and the defect rate. (3) Saving raw material cost, because the substrate does not need the design of RGB sub-pixels, the number of thin film transistors required in a single pixel is reduced, and the production yield is relatively increased (4) the complexity of the control circuit is simplified, and the complexity is also increased. The aperture ratio (Aperture Ratio) is beneficial to improve the spatial resolution of the panel pixels. Therefore, the field-sequential-optical compensation curved arrangement mode of the colorless filter has the maximum gain in display performance, which is to greatly improve the light utilization efficiency and reduce the power consumption, and can theoretically be upgraded to the conventional color. Filter-type liquid crystal displays are more than three times larger, because on average more than two-thirds of the light energy is absorbed by the color filters.

In addition, the same pixel in the field sequential-optical compensation bending arrangement mode has the same polarity in the front and back time periods, as shown in FIG. 1 , which is a panel of a liquid crystal display of a conventional field sequential-optical compensation curved arrangement mode. The schematic diagram includes sub-frames 10 and 20 in the panel 100. The disadvantage of this driving method is that the color of the adjacent pixels 111 is not uniform, and the difference in color is different, although the voltage or common electrode voltage (V _COM ) is adjusted. It can be improved, but it is relatively difficult to adjust to each area of each panel.

In view of the problems of the prior art, one of the objects of the present invention is to provide a field sequential-optical compensation curved alignment mode liquid crystal display to solve the conventional problems.

In accordance with the purpose of the present invention, a field sequential-optical compensated bend alignment mode liquid crystal display comprising a backlight module and one panel of an optically compensated curved alignment mode is provided. The backlight module includes at least one red, one green, one blue, and one white light source, and the panel includes at least one pixel and at least four sub-frames, and the backlight module respectively displays the single color with the sub-frames And the backlight module is configured to display different colors in sequence with the sub-frames, wherein the pixel has a first polarity in a first time period, and the pixel has a second polarity in a second time period. The second polarity and the first polarity are opposite in polarity and have opposite polarities to uniformize the color quality of the panel.

Specifically, if each pixel in the panel is defined to have a first polarity in a first time period, the pixel is in the second time period. There is a second polarity, the second polarity and the first polarity are reversed in polarity and have opposite polarities. The first time period and the second time period are adjacent to each other. In other words, if a particular pixel in a cycle (first time period) exhibits a positive polarity, the particular pixel in the next cycle (a second time period) exhibits a negative polarity. The so-called positive polarity means that the voltage of the pixel is higher than a common electrode voltage, and the negative polarity means that the voltage of the pixel is lower than the common electrode voltage. The reason is that each pixel in the liquid crystal display of the present invention compensates for each other by the polarity in the front and back time points, so that the color quality of the panel is uniformized, and the purpose of eliminating the difference in color depth is achieved.

In summary, the panel of the present invention not only changes the polarity of the pixels in the same position in the front and rear time, but also the pixels corresponding to each other in the four sub-frames of the panel are reversed in polarity. That is, if one pixel of a sub-frame is positive, and the pixel corresponding to the other sub-frame adjacent to the sub-frame is negative, then the pixel corresponding to the next sub-frame It is converted to positive polarity. In addition, the sub-frames respectively comprise a plurality of pixels, and the pixels in each sub-frame are reversed in polarity, and the inversion modes can be summarized as point inversion, 2V1H and line inversion, and can be borrowed. The change is controlled by the time control parameter (T _CON ) of a polarity signal line.

Hereinafter, an embodiment of the field sequential-optical compensation bending arrangement mode liquid crystal display of the present invention will be described with reference to the related drawings, for ease of understanding, The same elements in the embodiments are denoted by the same reference numerals.

First of all, Chen Ming, a conventional liquid crystal display module, has a single pixel (Pixel) composed of three sub-pixels (Sub-Pixel), each of which is composed of a thin film transistor (TFT). The electric field strength of the sub-pixel is controlled to determine the light intensity passing through the sub-pixel. Therefore, the light energy of each sub-pixel is modulated by the primary color (red, green, and blue) filters corresponding to the respective sub-pixels to obtain the light intensity of each primary color required for each sub-pixel. The reason is that traditional liquid crystal display technology must use a white backlight module, such as a Cold Cathode Fluorescent Lamp (CCFL) or a white light emitting diode (LED) light source.

In contrast, the Field Sequential Color-Optically Compensated Bend (FSC-OCB) liquid crystal display technology removes the color filter from the constituent elements of the liquid crystal module, so each pixel does not The sub-pixels need to be segmented, and the color is formed by the RGB-LED backlight module, and the light sources of the three primary colors are switched according to the timing. At the same time, in the display time of each color light source, the liquid crystal pixel transmittance of the synchronous control is adjusted to adjust the relative light quantity of each primary color, and finally, the integration effect of the visual system on the light stimulation is performed to form and detect the color. Also because LEDs typically have a spectral characteristic of narrow half-height width, they can exhibit high color saturation colors and effectively expand the system color gamut. Therefore, in general, the liquid crystal display technology of the field sequential-optical compensation curved alignment mode is superior to the liquid crystal display technology generally using color filters in the performance of high color saturation.

For this purpose, please refer to Figures 2 and 5, and Figure 2 is the present invention. The schematic diagram of the dot polarity inversion mode of the liquid crystal display in the field sequential-optical compensation bending alignment mode and the fifth figure are block diagrams of the liquid crystal display of the field sequential-optical compensation bending arrangement mode of the present invention. As shown in FIGS. 2 and 5, the liquid crystal display of the field sequential-optical compensation bending arrangement mode of the present invention comprises a backlight module 300 and an optical compensation curved alignment mode panel 100, wherein the backlight module 300 includes at least one red. a green, a blue, and a white light source, and the LCD frame 100, 200 can be displayed continuously according to a time period, and at least four sub-frames 110-140, 210-240 are displayed in each time period. The backlight module 300 displays a single color with the sub-frames 110-140 and 210-240, and the backlight module 300 displays the different colors in sequence with the sub-frames 110-140 and 210-240. . In fact, the present invention has only one panel, and the upper and lower halves in Fig. 2 represent changes in the panel over two different time periods. Next, the four sub-frames 110-140, 210-240 are arranged adjacent to each other, and can be summarized as the first sub-frame 110, 210 is displayed in gray, and the second sub-frame 120, 220 is displayed in blue. The third sub-frame 130, 230 displays green and the fourth sub-frame 140, 240 displays red. Furthermore, the panels 100, 200 comprise at least one pixel 111, 211. Each sub-frame 110-140, 210-240 of the panel 100, 200, for example, includes at least one pixel 111, 211. In other words, the pixels 111, 211 of the present invention do not need to be further divided into sub-pixels.

In detail, each pixel 111 in each sub-frame 110-140 in the panel 100 has a first polarity in a first time period, and the pixel 111 has a second polarity in a second time period. Second polarity It has a polarity inversion with the first polarity and has opposite polarity. The first time period and the second time period are adjacent to each other. Specifically, the polarity of each pixel in each adjacent sub-frame is reversed in the polarity of the first time period and the polarity in the second time period, and the color quality of the liquid crystal display is thus uniformized. According to Fig. 2, it can be known that the upper half of Fig. 2 exhibits the polarity (positive polarity or negative polarity) of each pixel 111 in a time period (first time period), which is the same as the lower half of Fig. 2. It is assumed that the polarity (negative polarity or positive polarity) of each pixel 211 is reversed in the next time period (second time period). For example, a particular pixel 111 in a time period exhibits a positive polarity, while the particular pixel 211 in the next time period is a negative polarity. In fact, the so-called positive polarity means that the voltage of the pixel is higher than a common electrode voltage, and the negative polarity means that the voltage of the pixel is lower than the voltage of the common electrode. Therefore, each pixel 111, 211 in the panel 100, 200 of the present invention compensates for the polarity of the liquid crystal display by mutual compensation of the polarities in the front and rear time points, and at the same time achieves the purpose of eliminating the difference in color depth.

As described above, in the first time period, the liquid crystal display of the present invention has four sub-frames 110-140, and the pixels 111 corresponding to the four adjacent sub-frames 110-140 are also one another. Polarity Inversion. Taking FIG. 2 as an example, the pixel 111 corresponding to the same position of each adjacent sub-frame 110-140 has a reverse polarity change of positive and negative polarity. That is, if a certain pixel 111 of the first sub-frame 110 is a positive electrode, and the pixel corresponding to the second sub-frame 120 is a negative polarity, the pixel corresponding to the third sub-frame 130 is converted into a positive electrode. Sex. another In addition, the second figure belongs to the dot inversion mode. In other words, the dot inversion is that the polarity of each adjacent pixel 111 is inverted in each sub-frame 110-140.

In summary, each of the sub-frames 110-140, 210-240 includes a plurality of pixels 111, 211, respectively, and the pixels 111, 211 in the sub-frames 110-140, 210-240 are inversely inverted from each other. In other words, the polarity of the pixels 111, 211 in each of the sub-frames 110-140, 210-240 is continuously changing, and whether the adjacent pixels 111, 211 have the same polarity, which may be according to different polarities. The conversion method is decided. Therefore, please refer to FIG. 3 and FIG. 4 respectively, which are schematic diagrams of the 2V1H mode of the liquid crystal display of the field sequential-optical compensation bending arrangement mode of the present invention and the field sequential-optical compensation bending arrangement mode of the present invention. A schematic diagram of the column inversion mode of the liquid crystal display. It is considered that in the third picture and the fourth picture, whether the pixel belongs to the inversion in the successive time period, or the pixels 111, 211 in the corresponding positions of the adjacent sub-frames 110-140, 210-240 are reversed. The type is the same as the above. That is to say, the most important technical feature of the present invention is that the pixels 111 and 211 at the same position in the front and rear time periods are in the form of pixels 111 and 211 whose polarities are reversed and the adjacent sub-frames 110-140 and 210-240 correspond to each other. The polarity is reversed, so it will not be described here.

However, the difference between the 2V1H and the line inversion and the point polarity inversion mode is that the polarity of the pixels 111 and 211 in each sub-frame 110-140, 210-240 in FIG. 3 is reversed by two pixels 111. 211 is a unit for inversion, and in FIG. 4, the entire line of pixels 111, 211 is a unit. Do reverse. The polarity inversion described therein is controlled by a time control parameter of a polarity signal line (not shown).

Therefore, the above description is only the disclosure of the preferred embodiment, and is not intended to limit the invention. Any equivalent modifications or alterations made without departing from the spirit and scope of the invention are intended to be included in the scope of the appended claims.

10‧‧‧Sub-frame

20‧‧‧Sub-frame

100‧‧‧ panel

110‧‧‧ first sub-frame

111‧‧‧ pixels

120‧‧‧ second sub-frame

130‧‧‧ Third sub-frame

140‧‧‧ fourth sub-frame

200‧‧‧ panel

210‧‧‧ first sub-frame

211‧‧ ‧ pixels

220‧‧‧Second sub-frame

230‧‧‧ third sub-frame

240‧‧‧ fourth sub-frame

300‧‧‧Backlight module

Figure 1 is a schematic diagram of a panel of a liquid crystal display of the conventional field sequential-optical compensated bend alignment mode.

Figure 2 is a schematic diagram of the dot polarity inversion mode of the liquid crystal display of the field sequential-optical compensation bending arrangement mode of the present invention.

Figure 3 is a schematic diagram of the 2V1H inversion mode of the liquid crystal display of the field sequential-optical compensation bending arrangement mode of the present invention.

Fig. 4 is a schematic view showing the line polarity inversion mode of the liquid crystal display of the field sequential-optical compensation bending arrangement mode of the present invention.

Figure 5 is a block diagram of a liquid crystal display of the field sequential-optical compensation bending arrangement mode of the present invention.

100‧‧‧ panel

110‧‧‧ first sub-frame

111‧‧‧ pixels

120‧‧‧ second sub-frame

130‧‧‧ Third sub-frame

140‧‧‧ fourth sub-frame

200‧‧‧ panel

210‧‧‧ first sub-frame

211‧‧ ‧ pixels

220‧‧‧Second sub-frame

230‧‧‧ third sub-frame

240‧‧‧ fourth sub-frame

Claims (6)

A field sequential-optical compensation curved alignment mode liquid crystal display comprising: one panel of an optically compensated curved alignment mode, the panel comprising at least one pixel, wherein the pixel is within a first sub-frame period of a first time period Having a first polarity, the pixel has a second polarity during the first sub-frame period of a second time period, and the second polarity and the first polarity are reversed in polarity and have opposite polarities. The color quality of the panel is uniform, wherein the first time period is adjacent to the second time period; and a backlight module includes at least one red, one green, one blue, and one white light source. The liquid crystal display of the field sequential-optical compensation bending arrangement mode according to claim 1, wherein the polarity inversion of the second polarity and the first polarity is controlled by a time control parameter of a polarity signal line. . The liquid crystal display of the field sequential-optical compensation curved alignment mode according to claim 1, wherein the first polarity and the second polarity are positive polarity or negative polarity, respectively. The liquid crystal display of the field sequential-optical compensation bending arrangement mode described in claim 3, wherein the positive polarity indicates that the voltage of the pixel is higher than a common electrode voltage, and the negative polarity indicates the voltage of the pixel. Below the common electrode voltage. Field sequential-optical compensation curved alignment mode liquid crystal display, package The invention comprises: a backlight module comprising at least one red, one green, one blue and one white light source; and one panel of an optically compensated curved arrangement mode, the panel sequentially displaying at least four sub-pictures in a first time period a frame, the panel includes at least one pixel, and the backlight module respectively displays a single color with the sub-frames, and the backlight module displays the different colors in sequence with the sub-frames, wherein the pixel is in a first a first sub-frame period of a time period has a first polarity, and the pixel has a second polarity in a corresponding sub-frame during the first sub-frame period of a second time period, the second The polarity and the first polarity are reversed in polarity and have opposite polarities to uniformize the color quality of the panel, wherein the first time period is adjacent to the second time period. The liquid crystal display of the field sequential-optical compensation bending arrangement mode according to claim 5, wherein the sub-frames respectively comprise a plurality of pixels, and the pixels between adjacent sub-frames are mutually One polarity is reversed, and the polarity is reversed by dot inversion, 2V1H, and line inversion.