Color image display apparatus, color converter, color-simulating apparatus, and method for the same

A color image and display device technology, applied in color separation/tone correction, color signal processing circuit, static indicator, etc., can solve problems such as difficult to achieve CRT color reproducibility, difficult to perform stable adjustment, color balance collapse, etc.

Inactive Publication Date: 2005-06-15
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As a result, even if such correction is performed, the color balance will collapse in halftones, making it difficult to achieve the same color reproducibility as CRT
[0012] In addition, according to the technique of Document 1, the operator's skill is required to adjust the color tone, and it is difficult to perform stable adjustment for various LCD device characteristics.

Method used

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  • Color image display apparatus, color converter, color-simulating apparatus, and method for the same
  • Color image display apparatus, color converter, color-simulating apparatus, and method for the same
  • Color image display apparatus, color converter, color-simulating apparatus, and method for the same

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Embodiment approach 1

[0041] figure 1 It is a block diagram of the image display device according to Embodiment 1 of the present invention. exist figure 1 , by pairing with Figure 13 The same components are given the same reference numerals and description thereof will be omitted. The image display device of the present embodiment performs color tone correction on input color data (device-dependent colors) of a color image and displays it. Simply put, by inverse conversion (correction) of the tone characteristics of the display unit 1, the color balance of the input color data is maintained for display.

[0042] Such as figure 1 As shown, the image display device includes the following components. First, the tone correcting section 12 corrects the tone of input color data of a color image using the 'tone distribution' stored in the tone distribution recording section 11 . On the other hand, the display unit 1 is a liquid crystal display that displays color data that has been tone-corrected...

Embodiment approach 2

[0076] Below, use Figure 6 to Figure 7 Embodiment 2 will be described. Hereinafter, in order to avoid repetition, the description of the same points as those in Embodiment 1 will be omitted.

[0077] Such as Figure 6 As shown, the difference between Embodiment 2 and Embodiment 1 is that, in the tone distribution generating unit 20, except the uncorrected RGB tone signals (0-255), white, and three primary colors (red, green, blue) In addition to the colorimetric value, the colorimetric value of the black component is also used as a condition.

[0078] The so-called 'colorimetric value of the black component' here is the colorimetric value when the input signal is '0'. Among them, in LCD, even if the input signal is '0', the luminance (Y) of the color measurement value is generally not '0' due to the influence of light leakage from the backlight of the transmissive LCD or surface reflection of the reflective LCD.

[0079] Figure 6 Indicates the internal components of the...

Embodiment approach 3

[0099] Below, use Figure 8 Embodiment 3 will be described. Hereinafter, in order to avoid repetition, the description of the same points as those in Embodiment 2 will be omitted.

[0100] The difference between Embodiment 3 and Embodiment 2 is that in the tone distribution generation unit 30, the uncorrected RGB tone signals (0-255) and the colorimetric value of the black component are used as conditions, and the matrix coefficient calculation unit is omitted to perform Operation simplification.

[0101] As the color purity of RGB of the display unit 1 increases, the diagonal components of the matrix coefficients of (Expression 7) are larger than the other components. The color tone distribution generation unit 30 of this embodiment outputs the color tone distribution based on the simplified expressions of (Equation 11), (Equation 12), and (Equation 13). That is, the X normalization unit 18a performs the calculation of (Expression 11), and outputs the red tone distribution...

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Abstract

A color image display device is provided, by displaying red, green, and blue tone signals R(i), G(i), and B(i) (i is 1 to n; n is the number of tones) on a display unit (1) Colorimetry is performed on the light above, and based on the calculation of the three attributes X(i), Y(i), and Z(i) of the colorimetric value (CIE-XYZ) of each tone signal, it is generated as a tone correction component The tone distribution of the correction condition of (12). The tone correction means (12) corrects the tone using the tone distribution. The color temperature stabilizes and improves the color reproduction of midtones (eg, natural images of skin tones, etc.), and improves display quality.

Description

technical field [0001] The present invention relates to a color image display device that improves color reproducibility of a display device by controlling color tone and related technologies. Background technique [0002] The use of color liquid crystal displays not only as displays for information terminals such as personal computers but also as monitors for viewing high-quality programs such as movies is rapidly increasing. When watching a movie, even a liquid crystal display (LCD) requires the same color reproducibility as a Braun tube (CRT). [0003] The red (R), green (G), and blue (B) tone characteristics of the CRT are uniform, and the color temperature of the display is constant regardless of the tone level. Since the color temperature is uniform, the color balance of the midtones of the CRT is good, and the color reproduction of skin tones and natural images is excellent. [0004] On the other hand, LCDs have different color tone characteristics for red (R), gree...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F3/10G06F15/00G09G5/02H04N9/12H04N9/69H04N9/73
CPCG09G5/02G09G2320/0285G09G2320/0693H04N9/67H04N9/69H04N9/73
Inventor 平岛毅池田淳尾岛修一畑亮太木内真也
Owner PANASONIC CORP
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