公开(公告)号：US3821721A

公开(公告)日：1974-06-28

申请号：US34165273

申请日：1973-03-15

Applicant: INT COMPUTERS LTD

Inventor： HUGHES G

IPC: G09G3/22 ,  G09F9/313 ,  G09F13/26 ,  G09G3/28 ,  G09G3/288 ,  H04N3/12 ,  G11C11/28 ,  G11C11/32 ,  H05B37/00

CPC classification number: G09F13/26 ,  G09F9/313 ,  G09G3/296 ,  G09G3/297 ,  H04N3/125

Abstract: Apparatus for displaying an image on an arrangement of gas discharge cells is disclosed in which a matrix of image display cells is formed by the interlacing of a number of elementary cell matrices. The elementary cells are so arranged that corresponding single cells from all the elementary matrices fall within each image display cell. The brightness of each image cell is therefore dependent upon the number of its elementary cells which are energised and the brightness level of those energised elementary cells. By arranging that the individual elementary cells of an image cell have different brightness levels and selecting appropriate combinations of these elementary cells to be energised a brightness range of at least 12:1 is possible for a single image cell, thus allowing the arrangement to display half-tone images acceptably. Tone separation of a displayed image is possible by reducing the brightness range of the display cells. The variations in brightness of the elementary cells may be achieved by, for example, the incorporation of optical filters, such as neutral density filters, to absorb light from some of the elementary cells within an image cell or by regulating the current permitted to flow in each elementary cell. The decoding of coded brightness information to control the energisation of the elementary cells during scanning of those cells within a display cell is disclosed.

公开(公告)号：US3778667A

公开(公告)日：1973-12-11

申请号：US3778667D

申请日：1972-05-11

Applicant: INT COMPUTERS LTD

Inventor： HUGHES G

IPC: G09G1/10 ,  H01J29/70

CPC classification number: G09G1/10

Abstract: The development of a simplified arrangement for drawing arcuate lines on a display, such as a cathode ray tube face, by the successive specification of a sequence of displacement positions is explained, and apparatus is described for calculating the sequence of displacement positions by relative right-shifting and selective addition of a pair of initially calculated values, one for each of two co-ordinate axes. The apparatus includes a first register for each of the initial values and an accumulator for each axis, the values from the first registers being entered into each of the accumulators to form a new value. The resultant values are used to specify a drawing displacement for each axis and are recirculated to replace the values in the first registers, this cycle of events being repeated as required until the line is drawn. Where an arc extends beyond a quadrant bounded by the axes the signs of the values entered into the accumulators are changed as required for drawing an arc in the new quadrant. The change of sign is effectively accomplished by selective complementing of the values as they are entered into the accumulators.

Abstract translation: 解释了通过连续指定位移位置序列来在诸如阴极射线管面之类的显示器上绘制弧形线的简化布置的开发，并且描述了用于通过相对右侧的方法来计算位移位置的顺序的装置， 移位和选择性地添加一对初始计算的值，一个用于两个坐标轴中的每一个。

公开(公告)号：US3763486A

公开(公告)日：1973-10-02

申请号：US3763486D

申请日：1971-11-16

Applicant: INT COMPUTERS LTD

Inventor： HUGHES G ,  HANKINS H ,  TORSUN I

IPC: G06F3/023 ,  G06F3/048 ,  G09G1/18 ,  G09G1/26 ,  G11C11/23 ,  G06F3/14

CPC classification number: G06F3/04892 ,  G09G1/18 ,  G09G1/26 ,  G11C11/23

Abstract: Two storage tubes, one used as a ''''permanent'''' data item store, the other as a display tube, share common power supplies and addressing arrangements. The two tubes are dark trace tubes and the beam current supply is arranged to produce writing and reading pulses of beam current which are delivered to the appropriate tube for (a) inserting new data items into the store tube and (b) for reading an item from the store tube and writing a resultant display on the display tube. The scanning of the store tube is cyclic and the data read from the store tube may produce a different display image.

Abstract translation: 两个存储管，一个用作“永久”数据项存储，另一个作为显示管，共享公用电源和寻址布置。 这两个管是暗轨道管，并且束电流供应器被布置成产生射束电流的写入和读取脉冲，其被输送到适当的管，用于（a）将新数据项插入储存管中，以及（b）用于读取物品 从储存管中将所得到的显示器写入显示管上。 存储管的扫描是循环的，并且从存储管读取的数据可以产生不同的显示图像。