1. Field of the Invention
The present invention relates to a color sequential liquid crystal display (LCD) device, and more particularly, to a color sequential LCD device that saves a frame buffer of a timing control circuit by use of a system side memory.
2. Description of the Prior Art
Generally, color mixing methods for a liquid crystal display (LCD) can be divided into two categories: a time-domain color mixing method and a space-domain color mixing method. Compared to the space-domain color mixing method, the time-domain method takes advantages of visual persistence of human eyes to display a particular color by quickly switching monochrome fields such as red (R), green (G) and blue (B). Thus, there is no need to use traditional color filters, resulting in advantages of lower production costs, higher light transmittance and so on.
For a color sequential LCD device that adopts the time-domain method, since an image frame with full-color information needs to be separated into monochrome fields before color mixing, a data sorting circuit has to be added into a timing controller of the LCD to sort the frame data coming from a system side such as a display card, for example, so as to output the monochrome fields to the LCD panel according to a predetermined color sequence. In addition, please refer to
However, in an actual design, the prior art may utilize two frame buffers for alternatively storing frame data outputted from the system side. In this case, as shown in
As mentioned above, the frame data with full-color information coming from the system side has to be sorted into the monochrome fields such as R-G-B, for example, in the color sequential LCD device. Thus, only after the whole frame data is completely transmitted by the system side, the corresponding monochrome fields can then be outputted to the LCD panel by the timing controller according to the predetermined color sequence. As a result, the prior art requires the memory space with at least one frame size for temporarily storing the sorted field data, and has disadvantages of poor efficiency.
It is therefore an objective of the present invention to provide a color sequential liquid crystal display (LCD) device and related image display method.
According to the present invention, a color sequential liquid crystal display (LCD) device is disclosed. The color sequential LCD device includes an LCD panel, a backlight module, an image processing circuit and a timing control circuit. The image processing circuit is utilized for performing image processing on an image data to generate a frame data with full-color information and for sorting the frame data to generate a plurality of field data according to a predetermined color sequence. The timing control circuit is coupled to the image processing circuit, the LCD panel and the backlight module, and includes a timing controller and a backlight controller. The timing controller is utilized for outputting the field data generated by the image processing circuit to the LCD panel. The backlight controller is utilized for controlling the backlight module to switch on back lights corresponding to the field data outputted by the timing controller.
According to the present invention, an image display method for a color sequential liquid crystal display (LCD) device is disclosed. The image display method includes steps of performing image processing on an image data to generate a frame data with full-color information and sorting the frame data to generate a plurality of field data according to a predetermined color sequence in an image processing circuit, outputting the plurality of field data to an LCD panel via a timing control circuit, and controlling a backlight module to switch on back lights corresponding to the field data outputted by the timing control circuit.
According to the present invention, a color sequential liquid crystal display (LCD) device is disclosed. The color sequential LCD device includes an LCD panel, an image processing circuit, a decoder and a timing control circuit. The image processing circuit is utilized for performing image processing on an image data to generate a frame data with full-color information and outputting a plurality of times of the frame data by frequency multiplication. The decoder is coupled to the image processing circuit, and is utilized for decoding each output of the frame data to generate a plurality of field data according to a predetermined color sequence. The timing control circuit is coupled to the decoder and the LCD panel, and is utilized for generating driving signals of the LCD panel according to the field data outputted by the decoder to control the LCD panel to sequentially display the field data.
According to the present invention, an image display method for a color sequential liquid crystal display (LCD) device is disclosed. The image display method includes steps of performing image processing on an image data to generate a frame data with full-color information and outputting a plurality of times of the frame data by frequency multiplication, decoding each output of the frame data to generate a plurality of field data according to a predetermined color sequence, and generating driving signals of an LCD panel according to the plurality of field data to control the LCD panel to sequentially display the plurality of field data.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
Please refer to
The timing control circuit 34 is coupled to the image processing circuit 33, the LCD panel 31 and the backlight module 32, and is utilized for controlling the LCD panel 31 and the backlight module 32 to sequentially display the field data outputted by the image processing circuit 33, so as to achieve color mixing on time domain. Preferably, the timing control circuit 34 includes a timing controller 342 and a backlight controller 344. The timing controller 342 is utilized for generating driving signals of the LCD panel 31 according to the field data outputted by the image processing circuit 33. The backlight controller 344 is utilized for generating backlight control signals to control the backlight module 32 to switch on corresponding back lights according to display time of the field data outputted by the timing controller 342. In addition, the color sequential LCD device 30 further includes a data transmission interface Tx/Rx, coupled to the image processing circuit 33 and the timing control circuit 34, for serially transmitting the plurality of field data to the timing control circuit 34 by a maximum bandwidth according to the predetermined color sequence. The data transmission interface Tx/Rx can be a Low-Voltage Differential Signaling (LVDS) interface or a Display Port (DP) transmission interface, and is not limited herein.
Therefore, in the color sequential LCD device 30 of the present invention, the frame data is sorted in the image processing circuit 33 (i.e. the system side), so that the monochrome fields such as R-G-B can be outputted to the timing control circuit 34 according to the predetermined color sequence. In such a situation, the timing control circuit 34 can control the LCD panel 31 and the backlight module 32 to sequentially display the field data outputted by the image processing circuit 33, so as to achieve the color mixing on time domain.
In other words, the embodiment of the present invention utilizes the frame memory of the system side for sorting the frame data and serially outputs the sorted field data to the timing control circuit, so that not only complexity of the hardware system can be simplified but also the memory usage of the timing control circuit can be reduced, leading to lower production cost.
Please refer to
Besides, assume the data transmission interface has a bandwidth of 3×8 bits and the image processing circuit 33 merely uses 6 bits to denote each pixel of the monochrome fields, the data transmission interface can thus transmits 4 pixels of the field data at the same time, so as to optimize the bandwidth usage of the data transmission interface. Such variation also belongs to the scope of the present invention.
Please further refer to
As for signal timing of the timing control circuit 34, please refer to
Therefore, compared with the traditional structures, the embodiment of the present invention not only can save memory usage of the timing control circuit (at least reduce to two-third of the traditional structures), but also can simplify the complexity of the hardware system to lower the production cost.
On the other hand, please refer to
For example, please refer to
Please refer to
Step 1200: Start.
Step 1210: Perform image processing on an image data to generate a frame data with full-color information and sort the frame data to generate a plurality of field data according to a predetermined color sequence in an image processing circuit.
Step 1220: Output the plurality of field data to an LCD panel via a timing control circuit.
Step 1230: Control a backlight module to switch on back lights corresponding to the field data outputted by the timing control circuit.
Step 1240: End.
Detailed operation of the image display process 120 is already described in the embodiments of the color sequential LCD device 30 and 60, and is not narrated again herein.
Moreover, for saving the frame memory required by the timing control circuit, the color sequential LCD device can also be implemented by other hardware structures in the present invention. Please refer to
That is to say, the embodiment of the present invention utilizes the image processing circuit 82 for outputting a plurality of identical frame data by frequency multiplication, and decodes the plurality of identical frame data by the decoder 83 to generate the monochrome fields such as R-G-B according to the predetermined color sequence. As a result, the timing control circuit 84 can control the LCD panel 81 and the backlight module 85 to sequentially display the monochrome fields outputted by the decoder 83, so as to achieve color mixing on time domain. Therefore, the embodiment of the present invention not only can save usage of the frame memory inside the timing control circuit, but also can significantly reduce design complexity of the LCD device since behaviors of the image processing circuit and ways to transmitting the frame data need not to be modified particularly.
For example, please refer to
It is noted that the above embodiments of the present invention are merely exemplary illustrations of the present invention and that those skilled in the art can certainly make modifications according to practical demands, which are not limited herein. For example, the color sequential LCD device can also display the monochrome fields by a predetermined color sequence such as R-G-B-G, or by inserting black color fields to enhance quality of motion pictures.
Besides, please refer to
Please further refer to
Please refer to
Step 1300: Start.
Step 1310: Perform image processing on an image data to generate a frame data with full-color information and output a plurality of times of the frame data by frequency multiplication.
Step 1320: Decode each output of the frame data to generate a plurality of field data according to a predetermined color sequence.
Step 1330: Generate driving signals of an LCD panel according to the plurality of field data to control the LCD panel to sequentially display the plurality of field data.
Step 1340: End.
Detailed operation of the image display process 130 is already described in the embodiments of the color sequential LCD device 70, 80 and 90, and is not narrated again herein.
In short, the embodiment of the present invention generates multiple identical frame data by frequency multiplication and decodes the multiple identical frame data to output the monochrome fields according to the predetermined color sequence, so as to save usage of the frame memory inside the timing control circuit. In addition, since behaviors of the image processing circuit and ways to transmitting the frame data need not to be modified in the embodiment of the present invention, design complexity of the color sequential LCD device can be reduced significantly.
As mentioned above, the present invention provides various improved structures of the color sequential LCD device for saving usage of frame memory inside the timing control circuit, so that the production cost can be reduced.
Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention.
Number | Date | Country | Kind |
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097145137 | Nov 2008 | TW | national |