Season 1 & Season 2, it has the same look as the bumper card as it has been the case in future seasons, with "Daily" in the same font as "Double" & "Final", and "Double" in the same font as "Jeopardy!" Future Daily Double cards/graphics (usually) have both words in the same fonts. Font used for the "Daily" is Futura.
When a Daily Double is found, the camera zooms in and the Daily Double logo flashes. It stops flashing when the clue is ready to appear. Originally, it was accompanied by a musical flourish when uncovered, but in the 1984 pilot and since October 8, 1984, it has been accompanied by a "laser" sound effect that has remained ever since. Since Season 2, when an Audio Daily Double is found, the camera faces to the player that selected it. Next, a little bit of music is played on some episodes and then the clue text appears below the player at the bottom of the screen. It’s unknown how the Video Daily Double clues were originally displayed despite debuting in the second season.
These are the actual screenshots of the images shown above.
Starting with the third season, when a Daily Double is found, its Daily Double logo flip zooms in. Back then at first, the Daily Double logo flashes just like on the board in the studio and stops after the clue appears. Later, the logo doesn't flash, then after the player makes a wager, the clue text zooms in to replace the Daily Double Logo. But when an audio Daily Double is found, the clue is placed below the player that selected it at the bottom of the screen. Then the music plays for about 15 seconds. If a Video is found, the clue text zooms in as usual, but after that, an image or video clip zoom-in the same way, replacing the clue text.
Season 6 Daily Double with blue grid background, white text and red arrows pointing up and down. From here to Season 7, Gill Sans returns, appearing both in the original and condensed versions; it is also used in Super Jeopardy!
Season 6 Daily Double with Red Text, blue arrows on a very interesting background which go up and down like the previous picture.
Season 6 Daily Double on a diagonal line background.
Season 6 Daily Double with yellow text, white arrows on the gray bumps background.
Season 8 was the last season to have the clue text zoom in to cover the Daily Double Logo. It's also the last season for the clue text to appear below the player that selected Audio Daily Double clues at the bottom of the screen. In 1992, the Daily Double Logo is now seen next to the player that selected it on the left side of the screen. But, after the clue is read out it doesn't disappear. It would disappear when the camera would point either at Alex Trebek or to all 3 players. But since September 1992, the clue does disappear after the clue is read. If a Video is found, the ways is displayed may vary, usually, the logo appears on the opposite side of the player and the clue is revealed, after the clue is revealed, an image or video clip appears replacing the contestant shot, or simply goes straight to the visual after the logo appears to the contestant. From 1997 to now, the logo now appears on the usual side of the contestant and flips to full screen covering the contestant with the visual clue. With the visual finished it fades in like before, but since 1998, it transitions like a page. However, on a June 11, 2004 episode featuring Ken Jennings, the Video Daily Double logo animates next to Ken as normal but flips to the blue clue text like the regular and Audio Daily Double clues, then a visual cross fades from his view, and fades back to Ken, rather than flipping the visual like a page.
Season 8A, starting here up until Season 9, Font used is Horatio Bold
Season 8B (Alternative version)
Season 8 Audio Daily Double
Season 9; same font letters from Season 8 with a bright red background.
Alternative version of the Season 9 Daily Double card without the brightness.
Season 9 Daily Double on the rough wall background.
Season 9 Audio Daily Double on the rough wall background.
Alternate Season 9 Daily Double intertitle used for the College Championship; Font used is Optima.
Season 10, Font used is Helvetica
Both "Audio" And "Video" have this font which is Brush Script
Believe it or not, this was used on early episodes from Season 11. It contains yellow letters over the blue globe; Font used is Bau
Season 11-13 Same red background from Season 10.
Season 10-12, used for Celebrity Jeopardy!; Font used is Bau
Sharing the same font with "Audio"; the font used for "Video" is Brush Script.