Classifications

• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
  • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
  • G09G5/06—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using colour palettes, e.g. look-up tables
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
  • G09G5/10—Intensity circuits
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2320/00—Control of display operating conditions
  • G09G2320/02—Improving the quality of display appearance
  • G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2320/00—Control of display operating conditions
  • G09G2320/06—Adjustment of display parameters
  • G09G2320/0626—Adjustment of display parameters for control of overall brightness
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2320/00—Control of display operating conditions
  • G09G2320/06—Adjustment of display parameters
  • G09G2320/066—Adjustment of display parameters for control of contrast
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G2360/00—Aspects of the architecture of display systems
  • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
  • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
  • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
  • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
  • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
• • G—PHYSICS
  • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
  • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
  • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
  • G09G5/36—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory

Definitions

• the present invention relates to an information display device for displaying predetermined information on a display screen.
• a technology for displaying characters on such a liquid crystal display a technology that displays a line width of less than one pixel by displaying the outline of the characters in a halftone and displays smooth and easy-to-read characters (anti-display technology). Aliasing).
• An object of the present invention is to solve the unsolved problem of the conventional technology, and an object of the present invention is to provide an information display device capable of improving the visibility of each display target. I do.
• an information display device of the present invention is an information display device for displaying predetermined information on a display screen, and detects a type of each display target to be displayed on the display screen, A luminance correction characteristic is set based on the type, and the luminance is corrected for each display target based on the luminance correction characteristic.
• the information display device of the present invention is an information display device for displaying predetermined information on a display screen, wherein the information display device detects a drawing element type for each pixel of the display screen.
• Means, characteristic setting means for setting a luminance correction characteristic based on the drawing element type, and luminance correction means for correcting luminance for each pixel based on the luminance correction characteristic. is there.
• the characteristic setting means includes the illuminance detected by the illuminance detection means and the illuminance detected by the drawing element type detection means. It may be characterized in that the luminance correction characteristic is set based on the drawing element type.
• the brightness is corrected for each type of display target such as characters and images, or for each type of drawing element.
• the brightness is corrected uniformly without considering the type of display target.
• the characteristic setting means when the drawing element type detection means detects that the drawing element type is a character, the lower the illuminance detected by the illuminance detection means, the halftone of the outline of the character
• the feature may be to set a brightness correction characteristic for correcting the brightness of a portion to be small.
• the brightness of the halftone portion of the outline of the character can be maintained, and a smooth and readable character can be displayed.
• the brightness of the halftone portion of the outline of the character is corrected to be small, and the character can be made darker as a whole, and as a result, the contrast is reduced.
• the characteristic setting unit sets the luminance value to a predetermined value or less as the illuminance detected by the illuminance detection unit decreases.
• the image processing apparatus further includes a VRAM that stores a drawing element type and a luminance for each pixel, and the luminance correction means and the characteristic setting unit perform processing based on the drawing element type stored in the VRAM.
• the display control device may set a luminance correction characteristic and correct the luminance stored in the VRAM with the luminance correction characteristic.
• the luminance information of the predetermined information and the drawing element type are stored in the main memory, and an increase in the load on the CPU is prevented as compared with a method in which the luminance correction unit and the characteristic setting unit are configured by the CPU. it can. Therefore, it is possible to reduce consumption of memory capacity and calculation cost, and it is suitable for use in a portable information terminal having scarce CPU resources and memory resources.
• FIG. 1 is a configuration diagram showing one embodiment of an information display device of the present invention.
• FIG. 2 is an explanatory diagram for explaining data stored in a VRAM of FIG. 1.
• FIG. 3 is a flowchart of an image display process executed by the display control device.
• FIG. 4 is an explanatory diagram for explaining a relationship between an illuminance area and illuminance.
• FIG. 5 is an explanatory diagram for explaining a luminance correction LUT.
• FIG. 6 is an explanatory diagram for explaining a character LUT.
• FIG. 7 is an explanatory diagram for explaining the operation of the embodiment of the present invention.
• FIG. 1 is a block diagram illustrating a schematic configuration of a portable information terminal 1 according to an embodiment of the present invention.
• the portable information terminal 1 has a CPU (Central Processing Unit) 2, a RAM (Random Access Memory) 3, a storage device 4, an input device 5, a display control device 6, a VRAM (Video Ram) 7, a display device 8 and an illuminance sensor 9 are included.
• a CPU Central Processing Unit
• RAM Random Access Memory
• storage device 4 an input device 5
• a display control device 6 a VRAM (Video Ram) 7
• a display device 8 and an illuminance sensor 9 are included.
• the CPU 2 executes various programs such as a basic control program stored in the storage device 4.
• the portable information terminal 1 reads the program and the data, develops and executes the various programs and data in a work area provided in the RAM 3, and controls each unit included in the portable information terminal 1. Further, the CPU 2 reads the designated image data from the storage device 4 according to the press signal from the input device 5, and outputs the image data to the display control device 6.
• the RAM 3 forms a work area for developing various programs when the CPU 2 executes the above-described processing according to various programs. Further, the RAM 3 forms a memory area for developing data relating to various processes executed by the CPU 2.
• the storage device 4 stores a basic control program executed by the CPU 2, various application programs, data related to these programs, and the like. Then, the storage device 4 outputs these various programs and data to the CPU 2 in accordance with the read request from the CPU 2.
• the various programs and data in the storage device 4 are all stored in a format that can be read and executed by the CPU 2.
• the input device 5 includes a keyboard having character keys, numeric keys, and various function keys. Then, when the keyboard is pressed, the input device 5 outputs a press signal corresponding to the pressed key to the CPU 2.
• the display control device 6 executes an image display process described later, develops image data output from the CPU 2 into raster data, and generates pixel data and pixel data constituting the raster data.
• the drawing element type which is information on the type of the drawing element corresponding to the data, is stored in the VRAM 7 address corresponding to the (x, y) coordinates of the pixel corresponding to each pixel data. Then, based on the illuminance of the display device 8 detected by the illuminance sensor 9 and the drawing element type stored in the VRAM 7, the pixel data stored in the VRAM 7 is corrected, and the corrected pixel data is displayed on the display device. Output to 8.
• the pixel data indicates the luminance value of each pixel on the display screen of the display device 8 by a numerical value of “0”-“255”, and “0” indicates that the luminance of the corresponding pixel is minimized, “255” indicates that the luminance of the corresponding pixel is maximized.
• the drawing element type includes, for example, characters, images, backgrounds, and the like.
• the outline of the text is halftone due to anti-aliasing.
• the VRAM 7 stores (x, y) of each pixel in accordance with a write request from the display control device 6. ) The pixel data and the drawing element type are stored in the address corresponding to the coordinates. Then, the VRAM 7 outputs the pixel data and the rendering element type to the display control device 6 according to the read request from the display control device 6.
• the display device 8 includes a display screen such as an ELD (electro luminescence display) or an L-D (Liquid Crystal Display), and has a predetermined configuration including characters and images according to pixel data output from the display control device 6. Display information.
• ELD electro luminescence display
• L-D Liquid Crystal Display
• the illuminance sensor 9 detects the illuminance around the display screen of the display device 8 and outputs information on the detected illuminance to the display control device 6.
• FIG. 3 is a flowchart of an image display process performed by the display control device 6. This image display processing is executed every time a predetermined time elapses. As shown in FIG. 3, in step S101, it is determined whether image data is output from the CPU 2 or not. If image data has been output (Yes), the process proceeds to step S102; otherwise (No), the process proceeds to step S103.
• step S102 the image data output from the CPU 2 is expanded into raster data, and pixel data constituting the expanded raster data and a rendering element type corresponding to the pixel data are determined.
• the process proceeds to step S103.
• the illuminance range is determined based on the illuminance information output from the illuminance sensor 9. Specifically, as shown in Fig. 4, when the illuminance is less than 10k, it is determined that the illuminance is in the illuminance area A (a fairly low temperature environment such as a night street light), and the illuminance is 10k or more and 100k or more. If it is small, it is judged to be in the illuminance range B (slightly dark environment such as a corner of a room at night). ).
• step S 104 the pointer of the VRAM 7 is set to an address corresponding to a predetermined head pixel (0, 0).
• step S105 the drawing element type stored at the address set by the pointer of the VRAM 7 is read.
• step S106 the character LUT group (Look) shown in FIG. 5 (a) and FIG. 5) .
• a luminance correction LUT group corresponding to the drawing element type read in step S105. You.
• a luminance correction LUT corresponding to the illuminance areas A, B, and C detected in step S103 is selected.
• the character LUT group has a correction value S “0” when the luminance value is “0”, and a correction value S “0” when the luminance value is “255”.
• the LUT corresponding to the illuminance area C has The correction value increases linearly as the luminance value increases.
• the LUT corresponding to the illuminance area B appears as a downwardly convex curve that increases with an increase in the luminance value with an increasing slope when the luminance value is “0”-“255”.
• the LUT corresponding to the illuminance area A has a smaller correction value than the LUT corresponding to the illuminance area B when the luminance value is “0” and “255”. It appears as a convex curve below.
• the LUT that reduces the luminance of the halftone portion to a small value is set as the luminance correction LUT.
• the correction value of the image LUT group is “0” when the luminance value is “0”, and the correction value is “127” when the luminance value is “127”.
• the LUT group has a correction value of ⁇ 255 '' when the luminance value is ⁇ 255 '', and includes LUTs corresponding to each of the illuminance areas A, B, and C. Among them, the LUT corresponding to the illuminance area C is When the luminance value is “0”-“255”, the correction value increases linearly with the increase of the luminance value.
• the LUT corresponding to the illuminance range B has a downwardly convex curve that gradually increases with an increase in the luminance value in the low gradation part where the luminance value is ⁇ 0 '' and ⁇ 127 ''.
• the curve appears as an upwardly convex curve which increases while increasing the decreasing slope sequentially as the luminance value increases.
• the LUT corresponding to the illuminance area A has a smaller correction value than the LUT corresponding to the illuminance area B when the luminance value is ⁇ 0 '' and ⁇ 127 ''.
• the correction value is larger than that of the LUT corresponding to the illuminance range B.
• the upward slope gradually increases with a decreasing slope. Appears as a curve. That is, when the drawing element type is an image, as the illuminance around the display screen decreases, the luminance of the low gradation part is corrected to be small and the luminance of the high gradation part is corrected to be large.
• the LUT is set as the luminance correction LUT.
• the background LUT group includes LUTs corresponding to all illuminance areas A, B, and C.
• the LUT has a correction value when the luminance value is "0". Is “0”, and when the luminance value is “255”, the correction value is “255”, and the luminance value between them is a LUT that increases linearly with the correction value as the luminance value increases. That is, when the drawing element type is the background, the LUT holding the luminance value is set as the luminance correction LUT regardless of the surrounding illuminance.
• step S107 in which pixel data stored in the address set by the pointer of the VRAM 7 is read, and the read pixel data is stored in the luminance selected in step S106. Correct according to the correction LUT.
• step S108 the process shifts to step S108 to output the pixel data corrected in step S107 to the display device 8.
• step S109 determines whether or not the image has been displayed on all the pixels, that is, the pointer is set at the predetermined final pixel (for example, the resolution of the display screen is SVGA (Super Video Graphics Array) 800 ⁇ 600 If the address is (799, 599), it is determined whether or not the address corresponds to the address. If it is the address corresponding to the last pixel (Yes), the calculation process is terminated, otherwise (No), the process proceeds to step S110.
• the predetermined final pixel for example, the resolution of the display screen is SVGA (Super Video Graphics Array) 800 ⁇ 600 If the address is (799, 599), it is determined whether or not the address corresponds to the address. If it is the address corresponding to the last pixel (Yes), the calculation process is terminated, otherwise (No), the process proceeds to step S110.
• the address of the pointer of the VRAM 7 is updated and set to an address corresponding to the pixel on the right of the previous pixel in plan view, and the process proceeds to the step S105. If there is no other pixel to the right of the previous pixel in plan view, the address is updated and set to the address corresponding to the pixel at the left end of the pixel group one row below in plan view.
• step S101 becomes “No”, and in step S103, the illuminance area A is detected based on the illuminance information output from the illuminance sensor 9.
• step S104 as shown in FIG. 2, the pointer of VRAM7 is set to the address corresponding to the first pixel (0, 0).
• step S105 the drawing element type (background) is read from VRAM7 based on the pointer. Is read in step S106, as shown in FIG. 5 (c).
• the background LUT is selected based on the drawing element type. Further, in step S107, pixel data is read from the VRAM 7 based on the pointer, and the read pixel data is left as it is in accordance with the luminance correction LUT. Further, in step S108, the pixel data kept as it is is output to the display device 8, the determination in step S109 becomes “No”, and in step S110, the pointer of the VRAM 7 is updated and set. From S105, the above flow is repeatedly executed. Then, when the pixel data is output from the display control device 6, the display device 8 adds a background pixel to the first pixel (0, 0) based on the output pixel data as shown in FIG. Is displayed.
• step S105 the drawing element type (image) is read from the VRAM 7 based on the pointer, and in step S106, as shown in FIG.
• the LUT for luminance correction according to the illuminance area A is selected from the LUT group.
• step S107 pixel data is read from the VRAM 7 based on the pointer, and if the read pixel data is a low gradation portion, the luminance is corrected to be smaller according to the luminance correction LUT. In the case of a high gradation portion, the luminance is further corrected.
• step S108 the corrected pixel data is output to the display device 8.
• steps S109 and S110 the above flow is repeatedly executed from step S105.
• the display device 8 has a large contrast to the pixel (0, yl) based on the output pixel data as shown in FIG.
• the image is displayed.
• the portable information terminal 1 When the portable information terminal 1 is used in a bright environment such as indoors or outdoors in the daytime and the illuminance around the display screen is in the illuminance range C, the image shown in FIG. As shown in (c), an image in which the luminance of the high gradation part and the low gradation part is maintained is displayed.
• step S105 V is set based on the pointer.
• the drawing element type (character) is read from the RAM 7, and in step S106, as shown in FIG. 5A, the luminance correction according to the power illuminance area A in the character LUT group based on the drawing element type is performed. LUT is selected.
• step S107 pixel data is read from the VRAM 7 based on the pointer, and if the read pixel data is a halftone portion, the brightness is corrected to be small according to the brightness correction LUT. .
• step S108 the corrected pixel data is output to the display device 8, and the above flow is repeatedly executed from step S105 through steps S109 and S110.
• the display device 8 When the raster data is output from the display control device 6, the display device 8 outputs a large contrast to the pixel (0, y2) based on the output pixel data as shown in FIG. Characters are displayed.
• the portable information terminal 1 is used in a slightly dark environment such as a corner of a room at night and the illuminance of the display screen is in the illuminance area B, as shown in FIG.
• the portable information terminal 1 When the portable information terminal 1 is used in a bright environment such as indoors or outdoors in the daytime and the illuminance around the display screen is in the illuminance area C, the characters shown in Fig. 7 (c As shown in (), a character in which the brightness of the halftone portion of the character outline is maintained is displayed.
• the type of display target is not considered.
• the illuminance of the display screen where the periphery of the display screen is bright is sufficient, the brightness of the image is maintained, so that a natural image can be displayed.
• the illuminance of the display screen is not sufficient because the periphery of the display screen is dark, the luminance of the low gradation part is reduced and the luminance of the high gradation part is increased, so that the contrast can be increased. It is possible to display an image in which the outline of the display target can be easily grasped.
• the illuminance of the display screen where the periphery of the display screen is bright is sufficient, the brightness of the halftone portion of the outline of the character is maintained, so that the character can be displayed smoothly and legibly. it can. Also, the surroundings of the display screen are dark. In such a case, the brightness of the halftone portion of the outline of the character is corrected to be small, so that the character can be darkened as a whole, and a character having a large contrast and easy to read can be displayed.
• the pixel data and the rendering element type are stored in the VRAM 7, and the image display processing is executed by the display control device 6.
• the pixel data and the rendering element type are stored in the RAM3, and the load on the CPU2 can be prevented from increasing as compared with the method in which the image display processing is executed by the CPU2.As a result, the consumption of the memory capacity and the calculation cost is reduced. Can be smaller.
• the conventional method of measuring the illuminance around the display screen with an illuminance sensor and changing the font itself so that the smaller the measured illuminance is, the thicker the line width of the character is, is to use multiple fonts in advance in the system.
• step S107 in FIG. 3 constitutes a luminance correction unit
• step S105 in FIG. 3 constitutes a drawing element type detection unit
• step S106 in FIG. The illuminance sensor 9 in FIG. 1 and step S103 in FIG. 3 constitute the illuminance detection means.
• the above-described embodiment shows an example of the information display device according to the present invention, and does not limit the configuration and the like.
• the present invention is not limited to this.
• the pixel data and the rendering element type may be stored in the RAM 3, and the image display processing may be executed by the CPU 2.
• the consumption of the memory capacity becomes large, it is not possible to use a general display control device 6 or VRAM7. it can.
• a LUT for a ⁇ curve or an S-curve is applied as the LUT for luminance correction is shown.
• a LUT such as a bent straight line, raised bottom, or head-down may be applied.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Computer Hardware Design (AREA)
• General Physics & Mathematics (AREA)
• Theoretical Computer Science (AREA)
• Control Of Indicators Other Than Cathode Ray Tubes (AREA)
• Controls And Circuits For Display Device (AREA)
• Liquid Crystal Display Device Control (AREA)

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Citations (5)

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• 2003
  • 2003-10-07 JP JP2003348054A patent/JP4175234B2/ja not_active Expired - Fee Related
• 2004
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  • 2004-10-05 WO PCT/JP2004/014657 patent/WO2005036520A1/ja not_active Ceased
  • 2004-10-05 KR KR1020057013829A patent/KR100727835B1/ko not_active Expired - Fee Related
  • 2004-10-05 DE DE602004025129T patent/DE602004025129D1/de not_active Expired - Lifetime
  • 2004-10-05 CN CNB2004800020194A patent/CN100428329C/zh not_active Expired - Fee Related
  • 2004-10-06 US US10/959,904 patent/US7385599B2/en not_active Expired - Fee Related

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