1. Field of the Invention
The present invention relates to flat panel displays and, more particularly, to a timing generator of flat panel display and polarity arrangement control signal generation method therefor.
2. Description of Related Art
Flat panel display is the dominant type of display in the market. Currently, there are three widely used flat panel displays, namely liquid crystal displays (LCDs), thin film transistor LCDs (TFT-LCDs), and organic electroluminescence display (OELDs). The principles of LCDs or TFT-LCDs are that the orientation of liquid crystal molecules is controlled by bias and in turn the light transmission thereof can be controlled for generating gray scales with a color effect.
However, the liquid crystal molecules may be permanently deformed, resulting in a poor display quality if the liquid crystal molecules are continuously biased by a voltage having the same polarity. Currently, there are a couple of voltage polarity inverting control methods as detailed below. In
This is a block-based configuration (e.g., blocks 110, 120, 130, and 140). In a case of column signals of the display panel 100 driven by time division multiplexing, an input pattern can cause a sum of all effective voltages of one polarity applied to the liquid crystal to be much larger than a sum of all effective voltages of the opposite polarity applied to the liquid crystal, which may cause cross-talk. As a result, the display quality will be lowered because picture of one block of the display panel 100 may adversely affect brightness of the pictures of adjacent blocks thereof.
In
An object of the present invention is to provide a timing generator of flat panel display and polarity arrangement control signal generation method therefor so as to decrease cross-talk and improve display quality.
In one aspect of the present invention there is provided a timing generator of a panel display for generating a PAC (Polarity Arrangement Control) signal and sending the same to a data driver so that the data driver is operative to control a polarity of display data based on the PAC signal and send the display data to a display panel, the timing generator comprising a storage unit for storing a plurality of sets of polarity data and a plurality of PAC signals wherein each set of polarity data includes a plurality of data polarities and each set of polarity data corresponds to one of the PAC signals; an operation unit for receiving the display data, the plurality of sets of polarity data, and a corresponding one of the PAC signals so that the operation unit is operative to perform an inner product operation with respect to the polarity data of each set of polarity data and the display data for obtaining a sum of a plurality of coupling voltages corresponding to the polarity data of each set of polarity data; and a comparison unit for comparing the sum of coupling voltages with a predetermined value, and outputting the PAC signal if the sum of coupling voltages is smaller than the predetermined value.
In another aspect of the present invention there is provided a timing generator of a panel display for generating a PAC signal and sending the same to a data driver so that the data driver is operative to control a polarity of display data based on the PAC signal and send the display data to a display panel, the timing generator comprising a storage unit for storing a plurality of sets of polarity data and a plurality of PAC signals wherein each set of polarity data includes a plurality of data polarities and each set of polarity data corresponds to one of the PAC signals; an operation unit for receiving the display data, the plurality of sets of polarity data, and a corresponding one of the PAC signals so that the operation unit is operative to perform an inner product operation with respect to each set of polarity data and the display data for obtaining a sum of a plurality of coupling voltages corresponding to the polarity data; and a comparison unit for comparing the sums of coupling voltages each other for selecting a smallest sum of coupling voltages, and outputting a corresponding one of the PAC signals to the data driver.
In still another aspect of the present invention there is provided a method of generating PAC signal, comprising the steps of receiving display data, at least one set of predetermined polarity data, and at least one PAC signal corresponding to the at least one set of PAC data; performing an inner product operation with respect to the at least one set of PAC data and the display data for obtaining a sum of at least one coupling voltage; comparing the sum of at least one coupling voltage with a predetermined value; and outputting the PAC signal of polarity data corresponding to the sum of at least one coupling voltage if the sum of at least one coupling voltage is smaller than the predetermined value.
In a further aspect of the present invention there is provided a method of generating PAC signal, comprising the steps of receiving display data, at least one set of predetermined polarity data, and at least one PAC signal corresponding to the at least one set of PAC data; performing an inner product operation with respect to each set of polarity data and the display data for obtaining a sum of a plurality of coupling voltages corresponding to the at least one set of polarity data; comparing the sums of coupling voltages each other for selecting a smallest sum of coupling voltages; and outputting a corresponding PAC signal having the smallest sum of coupling voltages.
Other objects, advantages, and novel features of the invention will become more apparent from the detailed description when taken in conjunction with the accompanying drawings.
With reference to
With reference to
A flow chart of the first preferred embodiment of the invention will be illustrated in
The operation unit 3212 is adapted to receive display data representing a voltage vector of no polarity in which the larger of the value of display data the closer to by or 0V the voltage will be. The operation unit 3212 is also adapted to receive one of the plural sets of polarity data in the storage unit 3211 and a corresponding PAC signal (e.g., a first set of polarity data). The elements of the set of polarity data are data polarities in which the corresponding element of the set of polarity data is +1 when the data polarity is positive and on the contrary, the corresponding element of the set of polarity data is −1 when the data polarity is negative (step S501).
Next, the operation unit 3212 uses the adder 32121 to perform an inner product operation with respect to the set of polarity data and the display data for obtaining an absolute value of the inner product as a result. That is, the result corresponds to a sum of coupling voltages of the PAC signal of the set of polarity data. For example, the result is +4 (step S502). The result then is sent to the comparison unit 3213 for comparing with a predetermined value (e.g., +5). It means that the coupling value of the corresponding PAC signal of the set of polarity data (i.e., the absolute value of the sum of coupling voltages) is smaller if the result is smaller than the predetermined value per the comparison in the comparison unit 3213. As an end, it is possible of decreasing cross-talk and improving display quality. Finally, the comparison unit 3213 outputs the PAC signal to the data driver 330 so that the data driver 330 is able to control the polarity arrangement of liquid crystal of the display panel 300 in response to the PAC signal (step S503).
The comparison unit 3213 will output an enable signal to the counting unit 3214 for incrementing the counting unit 3214 by one if the result is larger than the predetermined value. Accordingly, the storage unit 3211 is able to sequentially output a second set of polarity data and the corresponding PAC signal to the operation unit 3212 (step S504). Next, the operation unit 3212 performs an operation with respect to the new set of polarity data and the display data for obtaining a corresponding sum of coupling voltages (step S502). Next, the corresponding sum of coupling voltages is sent to the comparison unit 3213 for comparing with the predetermined value again. The above loop will end once the sum of coupling voltages of the set of polarity data is smaller than the predetermined value. Subsequently, the comparison unit 3213 sends the corresponding PAC signal of the set of polarity data to the data driver 230 (step S503). The corresponding PAC signal of the set of polarity data having the smallest sum of coupling voltages will be outputted if the sum of coupling voltages of each of all sets of polarity data is larger than the predetermined value.
A flow chart of a second preferred embodiment of the invention is illustrated in
In view of the foregoing, it is known that, in the invention, a plurality of sets of polarity data and a plurality of corresponding PAC signals are stored in advance, and then an operation is performed with respect to one set of polarity data and the display data for obtaining a corresponding sum of coupling voltages. The sum of coupling voltages of one set of polarity data is compared with a predetermined value. If the sum of coupling voltages of one set of polarity data is smaller than the predetermined value, the corresponding PAC signal of the polarity data is outputted to the data driver. Alternatively, the sums of coupling voltages of the sets of polarity data are compared with each other so as to choose the polarity data having a smallest sum of coupling voltages and the corresponding PAC signal for output. As an end, it is possible of obtaining an optimum polarity arrangement, decreasing cross-talk, and improving display quality.
Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Number | Date | Country | Kind |
---|---|---|---|
92119242 A | Jul 2003 | TW | national |
Number | Name | Date | Kind |
---|---|---|---|
6628256 | Nishimura | Sep 2003 | B2 |
6680722 | Hiraki et al. | Jan 2004 | B1 |
6734840 | Fukutoku et al. | May 2004 | B2 |
7027025 | Takeda | Apr 2006 | B2 |
7030843 | Youn | Apr 2006 | B2 |
20030197672 | Yun et al. | Oct 2003 | A1 |
Number | Date | Country | |
---|---|---|---|
20050012733 A1 | Jan 2005 | US |