1. Field of the Invention
The present invention generally relates to a sub-pixel area layout of a liquid crystal device. More particularly, the present invention relates to a liquid crystal device with embedded element and a method for designing thereof.
2. Description of the Related Art
Touch panels can be used in portable products and are particularly suitable for human operation. Thus, touch panels are widely used in various electronic products, comprising personal digital assistants (PDA), palm sized PC, cellular phones, hand-write inputting device, information appliances, automated teller machines (ATM) and point of sales (POS). Portable communication and consumer electronic products are developing rapidly and touch panels are widely used in these products. Therefore, many companies join in co-development of technologies which relate to touch panels.
Certain touch panel provides a method for distributing sub-pixel area to resolve the aforementioned drawbacks of resultant color shift.
Accordingly, a novel designing method is required to overcome white distortion and minimize brightness reduction issues for this embedded touch panel.
The invention provides a designing method for integrating an embedded device into a liquid crystal panel, comprising providing an adjustable backlight spectrum range, and designing the area ratio of sub pixels occupied by an embedded element and a readout line in a touch panel according to the adjustable backlight spectrum range.
The invention further comprises a liquid crystal panel device with an embedded device, comprising a pixel comprising at least three sub pixels, wherein the sub pixels comprises a first sub pixel, a second sub pixel and a third sub pixel, an embedded element and a readout line, wherein area of the sub pixels occupied by the embedded element and the readout line is A, area of the first sub pixel occupied by the embedded element and the readout line is A1, area of the second sub pixel occupied by the embedded element and the readout line is A2, area of the third sub pixel occupied by the embedded element and the readout line is A3, sum of A1, A2 and A3 equals A, and at least two of A1, A2 and A3 are not zero.
The invention yet further comprises a liquid crystal panel device with an embedded device, comprising a first sub pixel, a second sub pixel and a third sub pixel, wherein each of which displays light with different wavelength, and has different size.
The invention yet further provides a designing method for integrating an embedded device into a liquid crystal panel, comprising (a) providing an adjustable backlight spectrum range, (b) designing the area ratio of sub pixels occupied by an embedded element and a readout line in a touch panel according to the adjustable backlight spectrum range, (c) generating a chromaticity coordinate value and a brightness loss (d) comparing the chromaticity coordinate value with a target chromaticity coordinate value and evaluate the brightness loss (e) repeating the steps (b) to (d) till difference of the chromaticity coordinate value and the target chromaticity coordinate value within an acceptable range and the brightness loss to be less than a acceptable range.
The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein,
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Throughout the specification, reference to “embedded touch panel” means that a display panel with embedded elements compatible with, attached to, or formed as a component of host and an optional device. The embedded elements capable of detecting various characteristics of the inputs provided by one or more input devices, including their locations and timings. In one embodiment, the embedded element can detect at least one characteristics of the electromagnetic wave including wavelength, pulse frequency, durations, timing, intensity, modulation scheme, input patterns, temperature and size. Input devices, may provide inputs to liquid crystal device embedded with the above elements, such as optically or in the form of energy beams. Energy beams may include beams in the form of infrared, invisible, or visible light.
The present invention provides a method for designing an embedded touch panel which remains the white point chromaticity at a standard color coordinate even though embedded devices and readout lines occupy part sub-pixel area, and minimizes the transmissible loss (as well as the brightness loss) resulted from occupancy of the embedded devices and the readout lines.
The different aperture ratio for each color sub pixels is provided in the present invention according to backlight spectrum, for the purpose that the embedded elements in an array do not affect color and brightness performance. Assume the area of the inlet area is 0.5 and the largest area of the monochromatic sub pixel is 1, the other two sub pixels must have an area less than 1, but greater than 0.5. Preferably, when the area of the largest sub pixel is 1, the area ratio of the other two sub pixels is 0.7:0.8, but is not limited thereto. The each monochromatic sub pixel may have different size with the wide of the sub pixel opening along the direction x (the direction along gate lines) if the distance between adjacent gate lines is fixed. Referring to
In the second embodiment of the liquid crystal panel device 401 shown in FIG. 4, a plurality of gate lines 402 extend along a direction, and a plurality of data lines 404 intersect with the gate lines 402 to define a plurality of sub pixel regions. The readout line 406 parallel with the data line 404 is electrically connected to the embedded element 408. Referring to the sub pixel 416 in
Table 1 shows the rate of the experimental examples and comparative examples described above of the present invention.
Referring to the target value in Table 1, provided a reference value of white point chromaticity coordinate when the typical panel leave the factory, and all current panels are required to achieve this standard white point chromaticity coordinate (0.313, 0.329). Take the typical panel for example, the endurable variation in the white point chromaticity is about 0.0020˜0.003. When a white point chromaticity is out of the above endurable range, the white balance of the panel will be deviated such that the color appearance of pictures displayed by the panel is also shift.
The below experimental examples and comparative examples result from innumerable test taking account to CIE 1931 standard illuminant data and following the method illustrated in
Supposed each sub pixel size without occupied by additional embedded element is 1 (100%), and the predetermined size of the embedded element (referred shortly as the inlet region in the description below) is substantially 0.5. The color coordinate of Y is influenced most strongly by the green sub pixel among the tri-chromatic sub pixels, thus designing an inlet region occupied the red sub pixel and the blue sub pixel are 20% and 30%, respectively. In other words, the aperture ratio of the green sub pixel is constant, but the size of the red sub pixel and the blue sub pixel are 0.8 and 0.7, respectively. In according to the flow diagram of
When an inlet region occupies the original red sub pixel and the original blue sub pixel are 20% and 30%, respectively. In other words, the aperture ratio of the green sub pixel is constant, but the sub pixel size of the red and the blue sub pixels are 0.7 and 0.8, respectively. The brightness level and the chromaticity coordinate are measured, and the x coordinate deviation (Δx) or the y coordinate deviation (Δy) is determined, as shown in Table 1. The calculated result of Δx is 0.0007, but shown as zero due to under the tolerant limit, and Δy is 0.001.
The inlet region is merely disposed in the red sub pixel region, as described in background of the invention, hence the area size of the red sub pixel is 0.5 and the aperture ratios of the blue sub pixel and the green sub pixel are constant. The brightness level and the chromaticity coordinate are measured, and compared with the target value to get the Δx and the Δy, as shown in Table 1. The result of Δy is 0.0015, and the Δx is 0.021, which Δx exceeded seriously the tolerant limit (0.002˜0.003).
The inlet region is merely disposed in the blue sub pixel region, as described in background of the invention, hence the area size of the blue sub pixel is 0.5 and the aperture ratios of the red sub pixel and the green sub pixel are constant. The brightness level and the chromaticity coordinate are measured, and compared with the target value to get the Δx and the Δy, as shown in Table 1. The result of Δx is 0.001, and Δy is 0.017, which Δy exceeded seriously the tolerant limit.
Referring to Table 1, in the monochromatic color sub pixel is occupied by inlet region, shown as the comparative example 1 and the comparative example 2, chromaticity coordinate is deviates seriously the target value (0.313, 0.329), even if the backlight spectrum is adjusted. In contrast, the chromaticity coordinate of experimental examples (both the example 1 and example 2) by adjusting at least two color sub pixels according to the adjustable backlight spectrum is approaching to the target value.
The two experimental examples are used for explanatory, therefore, other occupancy ratio of the inlet region where the chromaticity coordinate close to the target value under the adjustable backlight spectrum is concluded. People in the art should select the condition having the lowest brightness loss and best color performance within the adjustable range of the backlight spectrum. The invention only shows examples adjusting the area of red and blue sub pixels, however, people skilled in the art can select at least two colors sub pixel to get better color and brightness performance, because individual sub pixel will contribute to color performance. Furthermore, the size of the inlet region will be changed with respect to its function and technology. The embodiment described is only used to illustrate the present invention, people skilled in the art can easily understand other advantages and effects of the invention.
While the invention has been described by way of example and in terms of the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. It is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
Number | Date | Country | Kind |
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98143858 | Dec 2009 | TW | national |