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Technical Paper

Vacuum Fluorescent Displays for Car Audio Systems

1990-02-01
900239
The Vacuum Fluorescent Display (VFD), being a self-emissive display device featuring high luminance and excellent readability, has become widely used for automotive applications. The ability to drive it at 12V and to adjust the luminance with the duty cycle, give the VFD high consideration, especially for the display in the car audio system. The number of display segments for the car audio system has increased to more than 50. Adding new functions to the car audio system will increase the required number of display segments. In the 12V static drive system, the number of display segments determines, and equals, the number of driver integrated circuit (IC) output bits required. An increase in the number of anode terminals, required by the increase in display segments, will result in increases in system cost, assembly complexity, space-related problems, etc. This paper reports on attempts taken to solve these problems.
Technical Paper

Vacuum Fluorescent Display for Head-Up Display

1988-02-01
880454
Head-Up display (HUD) system for automobile is made possible by the recent development of the ultra high brightness vacuum fluorescent display (UHB-VFD). Co-planar technology is used to construct the UHB-VFD. The development of the VFD for automotive HUD will be discussed in this paper.
Technical Paper

VFD Systems Directly Driven by Single Chip Microcomputer for Automotive Applications

1989-02-01
890286
Vacuum Fluorescent Displays (VFD's) are being used widely as the informational display panel in the automobile because they are a self-emissive, high luminance display device that feature crisp and easy-to-read images. This paper reports on the development of a VFD that can be directly driven by the outputs of a single chip microcomputer operating from a 12 volt supply. This system is most ideal for automotive applications.
Technical Paper

Universal Grid Vacuum Fluorescent Display for Automotive Applications

1994-03-01
940258
VFD has occupied a superior position as an automotive information display device because of its self emissive high luminance, high reliability, and excellent readability. Recently, most VFD applications have demanded more flexible graphic design capability, reduction of development cost, and short lead time. To respond to these demands, the Universal Grid VFD was developed and mass produced for consumer applications. Taking advantage of its free design capability and unique driving method, Universal Grid VFD was adapted to automotive applications (ECC, ETR, Odo/Trip Meter) and achieved 1700 cd/m2 luminance at 12V and 1/3 duty anode/grid operation. This paper discusses the development of Universal Grid VFD, its characteristics and reliability.
Technical Paper

Ultra-Light Vacuum Fluorescent Display (UL VFD)

1996-02-01
960527
Vacuum Fluorescent Displays (VFDs) have been widely accepted for automotive applications in the U.S. and other countries because of their excellent performance capabilities such as high luminance, high reliability and low voltage operation. Recently, more compact and lightweight VFD packaging has been requested for use in limited-space applications and to achieve smaller overall system size, while concurrently pursuing a higher graphic-to-glass area ratio and maintaining VFD's excellent viewing angle capability. An Ultra Light Vacuum Fluorescent Display (UL VFD) has been developed to meet these challenges which has 14% thinner package thickness and 30% larger available graphic area compared to conventionally produced VFD. This paper discusses the development of UL VFD and its subsequent evaluation and testing.
Technical Paper

Trend in Vacuum Fluorescent Displays

1982-02-01
820264
Trend in Vacuum Fluorescent Displays relates to the technological advances in the design and construction of VFD's, with emphasis on recent and state of the art technology. Current design criteria plus operation parameters are outlined. Additionally, market demands on the display sector are noted with sections on both the displays of the present and future.
Technical Paper

The Visual Recognition of Vacuum Fluorescent Displays Under Sunlight Conditions

1982-02-01
820013
The visual recognition of self-luminous displays in the automobile instrument panel under direct sunlight conditions is a major design criteria. The user-display interface requires the designer to consider factors of visibility, legibility, reading fatigue and styling. All factors are important, but under direct sunlight conditions, visibility has to take the highest priority and is the most important design factor. The object of this paper is to delineate visibility parameters by analyzing the results of experiments designed to determine the minimum brightness levels and type of filtering required to obtain visual recognition of vacuum fluorescent displays under the sunlight conditions.
Technical Paper

Single Vacuum Fluorescent Display, Full Featured Cluster Panel

1992-02-01
920597
Vacuum Fluorescent Displays (VFD's) for automotive Electronic Instrument Panels (EIP's) have been advancing in recent trends toward large scale systems. These systems offer the attractive appearance of large graphics, the flexibility of both analog and digital style images, and the cost reduction advantages of simpler power supplies, driving circuitry, and assembly procedures. A VFD consisting of all of the primary gages of an EIP was developed and mass produced. This paper will discuss this full size integrated cluster panel.
Technical Paper

Multi-Function Large Scale Glass Vacuum Fluorescent Displays for Automotive Applications

1983-02-01
830043
Vacuum Fluorescent Displays have been manufactured for automotive applications for over six years. During this period, various technological advances, such as increased brightness, multicolors, and decreased power consumption have lead to the rapid expansion of the Vacuum Fluorescent Display (VFD) market. The following paper will discuss high brightness displays for automotive applications, focusing on large scale displays. These large scale displays are now becoming practical for mass production. We will discuss various design problems that are encountered and how to solve them; plus what performance criteria is targeted for future improvement.
Technical Paper

Miniature Size Vacuum Fluorescent Display for Automotive Radio Application

1984-02-01
840169
Miniature Size Vacuum Fluorescent Displays for Automotive Radio Applications portray the application evolution and the technological advances necessary to develop displays for the automotive products. New VFD technological developments, including thin film and front luminous vacuum fluorescent displays, are outlined. Additionally, FLVFD operational parameters and drive circuitry available in the market are discussed.
Technical Paper

Luminous Efficiency Improvements of Color Phosphors Used in Vacuum Fluorescent Displays

1990-02-01
900669
The luminous efficiency of yellowish green and blue phosphor has been greatly improved. A luminance of 400 cd/m2 can be obtained at 12V with the yellowish green phosphor, whose luminance efficiency increased to 130%. This improvement suggests that the yellowish green phosphor can be used in the 12V driven VFD for the automotive application as well as greenish yellow and yellowish orange (1)*, (2)*. With respect to the blue phosphor, the luminance efficiency has been increased up to 160%, thus reducing the input power down to about 63%. By the continuing improvement, the blue phosphor will also be available in the 12V driven VFD.
Technical Paper

Low Cost Electronic Instrument Panel Systems Using Clip-On Type Vacuum Fluorescent Displays

1990-02-01
900671
The adoption of the newly developed self-standing grid construction allows a more flexible layout of the electrodes and location of the grids, while reducing the number of grid leads. These improvements make it possible to minimize the lead pitch and to increase the flexibility of the lead out position. For example, the leads of the new clip-on type displays will allow them to be condensed on one side of the display, while in the case of the ordinary Vacuum Fluorescent Displays (VFDs) the leads are located on both the top and the bottom. By connecting flat cables to the minimized leads, a clip-on VFD was successfully developed, which is excellent in terms of mounting flexibility, circuit maintenance, system cost and function. The manufacturing process and features of the clip-on VFD will be described later.
Technical Paper

Large Scale Message Center Vacuum Fluorescent Display for Automotive Applications

1991-02-01
910350
A large scale graphic vacuum fluorescent display was developed. The display is packaged in a panel size of 54.0 x 350.0 (mm) with 24 x 264 pixels (11 digits when a character consists of 24 x 24 pixels). Self-standing grid system was adopted to make finer grid divisions. To attain uniform luminance and prevent cross talk, the quadruplex anode matrix system was utilized. Wire dampers were used as an anti-vibration measure. To prevent thermal deformation of the grid, glass paste was applied to cover the grid bonding.
Technical Paper

High Resolution Graphic Front Luminous Vacuum Fluorescent Display

1988-02-01
880453
A 640 × 400 graphic Front Luminous Vacuum Fluorescent Display (FLVFD) module has been built utilizing a newly developed ultra high resolution display technology that allowed a pixel pitch of 0.1875 × 0.225mm. The module realized multicolored capability by adopting a field sequential control scheme with the combination of a liquid crystal shutter and halftone intensity levels.
Technical Paper

High Resolution Analog Vacuum Fluorescent Display

1993-03-01
930457
A Vacuum Fluorescent Display (VFD's) is widely accepted as a superior display device because of its impressive self-luminance and high reliability. VFD's for automotive applications have been used to convert signals to visual digital information. Now, in addition to digital style images, analog image displays are being requested for a wider choice of style. Furthermore, bright and clear display appearance and additional function are feasible by adopting the VFD technology to a pointer display application like mechanical speedometers or tachometers. This paper discusses the development of the large scale analog pointer image VFD for automotive use.
Technical Paper

Graphic Front Luminous Vacuum Fluorescent Display

1984-02-01
840155
The Graphic Front Luminous Vacuum Fluorescent Display (G-FLVFD) has been successfully developed and introduced to the market place. This G-FLVFD is the next generation of the matrix system employing a dual wire grid scanning system. By utilizing both front luminescence and the dual wire grid scanning system, high resolution is obtained having 320×240 pixels with a pixel pitch of 0.375mm. Near-term developments will include improved resolution, multi-colors and increased capacity.
Technical Paper

Graphic Display for Automobile

1984-02-01
840150
Today, there are several kinds of display technologies used in the automobile. Of these technologies, the Vacuum Fluorescent Display has the following advantages: 1. Excellent readability under high ambient light conditions 2. High reliability under severe environmental conditions 3. Multicolor capability 4. Large glass size 5. Graphics flexibility As a result, the Vacuum Fluorescent Display technology is the major type of display technology used in the automobile application. A design trend in the industry is toward the use of graphic displays because of the need to display more information, and to reduce the cost and space factor. Until recently, vacuum fluorescent graphic displays of large area and high resolution had been limited by the lower brightness due to the low duty factor driving condition.
Technical Paper

Front Luminous Vacuum Fluorescent Display

1983-02-01
830044
Front Luminous Vacuum Fluorescent Display is a variation of the vacuum fluorescent display technology which offers improvements in the areas of visibility, viewing angle, operating temperature range, and life. This technology has been discussed since the invention of the conventional vacuum fluorescent display (VFD) because of its structural similarity to the CRT. Today, Front Luminous Vacuum Fluorescent Display (FLVFD) technology is becoming a production reality. Since July, 1980, the following areas have been studied and evaluated to bring FLVFD to the state of commercialization: (1) Design study and trial production (2) Development of the transmissive anode and wiring pattern forming technology (3) Development of the phosphor coating technique (4) Study of the visual recognition characteristics (5) Reliability evaluation
Technical Paper

Development of a Non-Reflective Surface for Front Luminous Vacuum Fluorescent Displays

1986-03-01
860351
The front luminous vacuum fluorescent display (FLVFD) technology is a variation of the conventional vacuum fluorescent display technology. Having first been introduced into the consumer electronics market in 1983, FLVFD has seen increasing usage. FLVFD today offers improvements in the areas of visibility, viewing angle, package efficiency, operating temperature, and life. Although vacuum fluorescent displays have been utilized in automotive applications for more than ten years, the front luminous technology has not been used. The main reason for FLVFD's absence has been the highly reflective surface that the internal aluminum wiring forms on the front glass under direct sunlight conditions. This paper will discuss the studies and evaluations which have taken place to eliminate the reflection problem through the use of an optical multi-layer thin film process. This study assures the feasibility of using the FLVFD technology within the automotive environment.
Technical Paper

Color Graphic Front Luminous VFD

1985-02-01
850561
The color Graphic Front Luminous Vacuum Fluorescent Display has been successfully manufactured and is currently being introduced to the market place. This color G-FLVFD is constructed by coating each individual phosphor, red, blue, and green, separately on an anode. A sequential line drive employing a modified dual wire grid scanning system is utilized. The display has an effective graphic area of 120mm × 90mm, and can display patterns in eight colors.
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