1、EIA TEPL05-18 95 II 3234b00 0559422 TTT a w t TEPAC PUBLICATION Color Field Uniformity Test Procedures TEPlO5=18 APRIL 1995 ELECTRONIC INDUSTRIES ASSOCIATION ENGINEERING DEPARTMENT NOTICE EIA Engineering Standards and Publications are designed to serve the public interest through eliminating misunde
2、rstandings between manufacturers and purchasers, facilitating interchangeability and improvement of products, and assisting the purchaser in selecting and obtaining with minimum delay the proper product for his particular need. Existence of such Standards and Publications shall not in any respect pr
3、eclude any member or nonmember of EIA fiom manufacturing or selling products not conforming to such Standards and Publications, nor shall the existence of such Standards and Publications preclude their voluntary use by those other than EIA members, whether the standard is to be used either domestica
4、lly or internationally. Recommended Standards and Publications are adopted by EIA in accordance with the American National Standards Institute (ANSI) patent policy. By such action, EIA does not assume any liability to any patent owner, nor does it assume any obligation whatever to parties adopting t
5、he Recommended Standard or Publication. Technical Publications are distinguished from EIA Recommended Standards or Interim Standards, in that they contain a compilation of engineering data or information useful to the technical community, and represent approaches to good engineering practices that a
6、re suggested by the formulating committee. This Publication is not intended to preclude or discourage other approaches that similarly represent good engineering practice, or that may be acceptable to, or have been accepted by, appropriate bodies. Parties who wish to bring other approaches to the att
7、ention of the formulating committee to be considered for inclusion in fiiture revisions of this Publication are encouraged to do so. It is the intention of the formulating committee to revise and update this Publication from time to time as may be occasioned by changes in technology, industry practi
8、ce, or government regulations, or for other appropriate reasons. (From Project No. 3122, Formulated under the cognizance of the JT-31 Committee on Optical Characteristics of Display Devices). Published by OELECTRONIC INDUSTRIES ASSOCIATION 1995 Engineering Department 2500 Wilson Boulevard Arlington,
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11、t Englewood, CO 80112-5704 ur call U.S.A. and Canada 1-800-854-7179, International (303) 397-7956 TEP 105- 18 Page 1 COLOR FIELD UNIFORMITY TEST PROCEDURES Keywords: color purity, luminance variation, color difference, field uniformity 1 2 2.1 2.2 2.3 3 3.1 3.1.1 3.1.2 3.1.3 SCOPE This procedure is
12、recommended to demonstrate the degree of uniformity of any color field of a display device. For Simplification, references are made to a CRT monitor, but the principles of this procedure can be applied to other types of displays. This procedure does not identi limits or tolerances, but offers the us
13、er a standardized method which can be used to compare numerical values of color field uniformity. OPERATING PARAMETERS OF MONITOR Set up monitor according to TEP-105-1 1A. Choose the appropriate number of measuring points for the display area size. Choose additional measurement points, appropriate t
14、o the display area, which appear to a normal viewer to be slightly nonuniform. MEASUREMENT TECHNIQUES Simplified version - no luminance variation considered. Record (%y) for each point identified in clause 2, above. Convert (%y) to (u,v) coordinate system as outlined in TEP-1 16-B, page 9. Determine
15、 the two points which are farthest apart fiom one another in the (u,v) coordinate system. The equation used to determine the color difference between two points is: D - /(u, - u)* + (v, - Y;)? 3.2 To take into account luminance, the NBS measure of color perception is given by: Aw - V(AL) + (Au? + (A
16、v.) where E is the number of color difference units between any two points. 3.2.1 Record () - 16 for - 0.01 L- 903.3 $) (3) U - 13L (U, - 3 (4) V - 13L * (v; - d (5) 4 DISCUSSION It is widely accepted that a difference in luminance can effect a perceived difference in color. The user is cautioned to
17、 take this into account when performing measurements and using this procedure. Also, the user is encouraged to develop hidher own tolerances for color difference depending on the displays intended use, size and customers actual requirements. 5 REFERENCES Wyszecki & Stiles, Color Science: Concepts an
18、dMeth&, Quantitative Data and Formulae, 2nd ed., John Wiley & Sons, 1982 National Information Display Laboratory, Display Monitor Measurement Metho& under dscussion by HA Committee JT-20, Part 2: Color CRTMonitor Perjormance, Publication No. 313794-025, Draft Version 1, 1994 EIA TEPL05-18 95 = 3234600 0559427 581
