CN118486557A

CN118486557A - Illuminated keyboard and backlight module therefor

Info

Publication number: CN118486557A
Application number: CN202311753336.0A
Authority: CN
Inventors: 陈晏彰; 周柏岳
Original assignee: Chongqing Dafang Electronics Co ltd; Darfon Electronics Corp
Current assignee: Chongqing Dafang Electronics Co ltd; Darfon Electronics Corp
Priority date: 2023-02-10
Filing date: 2023-12-18
Publication date: 2024-08-13
Also published as: TW202433518A; TW202433517A; CN118486558A

Abstract

The invention relates to a luminous keyboard, which comprises at least two heat dissipation keys. The backlight module for the luminous keyboard comprises a lamp plate, a light guide plate and a light shielding plate and is provided with at least two through channels. The lamp panel, the light guide plate and the light shielding plate are vertically overlapped. The at least two through channels respectively correspond to the at least two heat dissipation keys symmetrically and penetrate through the lamp panel, the light guide plate and the light shielding plate. The peripheral edges of at least two through channels are respectively provided with a dimming pattern for shielding light. At least two diffusion patterns are arranged on the adjacent sides of the at least two dimming patterns to guide light to illuminate the at least two heat dissipation keys. The at least two dimming patterns and the at least two diffusion patterns respectively form at least two heat-reducing optical pattern groups. At least two heat-reducing optical pattern groups respectively corresponding to at least two heat-radiating keys have the same pattern. According to the invention, the through channel is utilized to radiate heat for the heating area below the radiating key, so that the radiating efficiency of the luminous keyboard is improved.

Description

Luminous keyboard and backlight module used for same

Technical Field

The present invention relates to a light emitting keyboard and a backlight module thereof, and more particularly to a light emitting keyboard with improved heat dissipation efficiency and a backlight module thereof.

Background

Along with the development of technology, the design of keyboards is becoming more and more diversified. When a user selects a keyboard, the keyboard should have basic input functions, and the visual effect of the keyboard is also valued by the user. At present, a luminous keyboard is already proposed in the market, which can be used at night or in places with insufficient light besides generating visual attraction to users. In the conventional light-emitting keyboard, if applied to a thinned computing device, a large number of elements are stacked in a narrow space of the computing device, so that the heat dissipation problem is more and more prominent. When the computing device is to improve the heat dissipation efficiency, the embedded keyboard module needs to be correspondingly adjusted.

Disclosure of Invention

The invention provides a luminous keyboard capable of improving heat dissipation efficiency and a backlight module used for the luminous keyboard.

According to an aspect of the present invention, there is provided a backlight module for a light emitting keyboard, the light emitting keyboard including at least two heat dissipation keys, the backlight module comprising:

A lamp panel;

A light guide plate; and

The light shield, the lamp panel, the light guide plate and the light shield are stacked up and down;

the backlight module is provided with at least two through channels which respectively correspond to each heat dissipation key symmetrically and penetrate through the lamp panel, the light guide plate and the light shielding plate, wherein the periphery of the at least two through channels is respectively provided with a dimming pattern to form at least two light shielding patterns for shielding light, the adjacent side of each of the at least two dimming patterns is provided with a diffusion pattern for guiding the light to illuminate the corresponding heat dissipation key, the diffusion patterns of the adjacent side of each of the at least two dimming patterns respectively form at least two heat dissipation optical pattern groups, and the at least two heat dissipation optical pattern groups respectively corresponding to the at least two heat dissipation keys have the same pattern.

As an alternative solution, each of the at least two light-reducing patterns is provided with two diffusion patterns on adjacent sides, and each of the at least two light-reducing patterns is located between the two diffusion patterns on adjacent sides.

As an optional technical solution, the backlight module has two through channels corresponding to each of the at least two heat dissipation keys, each of the at least two heat dissipation keys has a keycap projection area, and the heat-reducing optical pattern groups corresponding to each of the at least two heat dissipation keys are symmetrically located at opposite sides of each keycap projection area.

As an alternative solution, the at least two dimming patterns are formed on the light shielding plate or the light guiding plate.

As an alternative solution, the diffusion pattern is formed on the light guide plate or the lamp panel.

According to another aspect of the present invention, there is also provided a light emitting keyboard including:

At least one heat dissipation key, each heat dissipation key is provided with a key cap projection area;

The backlight module comprises a lamp plate, a light guide plate and a light shielding plate which are vertically overlapped, wherein the backlight module is provided with at least one through channel corresponding to the at least one heat dissipation key, the at least one through channel penetrates through the lamp plate, the light guide plate and the light shielding plate, the periphery of the at least one through channel is respectively provided with a light reduction pattern for shielding light, and the adjacent side of the light reduction pattern is provided with at least one diffusion pattern for guiding the light to illuminate the corresponding heat dissipation key; and

The key circuit board is arranged above the backlight module and comprises a circuit part which extends to cross the range of the projection area of the corresponding key cap;

Wherein the dimming pattern and the at least one diffusion pattern are positioned on the same side of the circuit portion.

As an optional technical solution, the method further includes:

the bottom plate is arranged between the key circuit board and the backlight module and comprises a rib part which extends to cross the range of the projection area of the corresponding key cap;

Wherein the light-reducing pattern and the at least one diffusion pattern are located on the same side of the rib.

As an alternative technical scheme, the backlight module is provided with two through channels corresponding to the heat dissipation keys, two dimming patterns corresponding to the two through channels are located at two opposite sides of the circuit portion, and two diffusion patterns corresponding to the two through channels are located at two opposite sides of the circuit portion.

As an optional technical solution, the method further includes:

The two light-reducing patterns corresponding to the two through channels are positioned on two opposite sides of the rib, and the two diffusion patterns corresponding to the two through channels are positioned on two opposite sides of the rib.

As an alternative solution, the dimming pattern is formed on the light shielding plate or the light guiding plate.

As an optional technical scheme, the at least one diffusion pattern is formed on the light guide plate or the lamp panel.

According to still another aspect of the present invention, there is provided a backlight module for a light emitting keyboard having a first heat dissipation key and a second heat dissipation key, the second heat dissipation key being adjacent to the first heat dissipation key in a first direction but being offset in a second direction, the backlight module comprising:

A lamp panel;

A light guide plate; and

the backlight module is provided with two through channels which respectively and symmetrically correspond to the first heat dissipation key and the second heat dissipation key, the two through channels penetrate through the lamp panel, the light guide plate and the light shielding plate, and the peripheries of the two through channels are respectively provided with a left heat reduction optical pattern group and a right heat reduction optical pattern group so as to respectively correspond to each of the first heat dissipation key and the second heat dissipation key;

the right heat-reducing optical pattern set corresponding to the first heat dissipation key at least partially overlaps the left heat-reducing optical pattern set corresponding to the second heat dissipation key in the first direction.

As an optional technical solution, each of the left athermalized optical pattern set and the right athermalized optical pattern set includes a dimming pattern and at least one diffusion pattern, where the at least one diffusion pattern is disposed on an adjacent side of the dimming pattern.

As an alternative solution, each light-reducing pattern is formed on the light-shielding plate or the light-guiding plate.

As an alternative solution, each diffusion pattern is formed on the light guide plate or the lamp panel.

According to still another aspect of the present invention, there is provided another light emitting keyboard including:

The first heat dissipation key and the second heat dissipation key are adjacent in the first direction but are staggered in the second direction;

the backlight module comprises a lamp panel, a light guide plate and a light shielding plate which are vertically overlapped, wherein the backlight module is provided with two through channels which respectively and symmetrically correspond to the first heat dissipation key and the second heat dissipation key, the two through channels penetrate through the lamp panel, the light guide plate and the light shielding plate, right heat reduction optical pattern groups are respectively arranged on the periphery of the two through channels, and each right heat reduction optical pattern group respectively corresponds to each of the first heat dissipation key and the second heat dissipation key; and

The key circuit board is arranged above the backlight module and comprises two switch connection pads which respectively correspond to each of the first heat dissipation key and the second heat dissipation key;

the right heat-reducing optical pattern set corresponding to the first heat-dissipating key at least partially overlaps the switch pad corresponding to the second heat-dissipating key in the first direction.

As an optional technical solution, the two through channels are respectively provided with left heat-reducing optical pattern groups at the periphery, each left heat-reducing optical pattern group respectively corresponds to each of the first heat dissipation key and the second heat dissipation key, and the left heat-reducing optical pattern groups corresponding to the first heat dissipation key at least partially overlap a key gap region outside the second heat dissipation key in the first direction.

As an optional solution, each of the right athermalized optical pattern sets includes a dimming pattern and at least one diffusion pattern, where the at least one diffusion pattern is disposed adjacent to the dimming pattern.

In summary, the present invention designs more than one through channel in the light emitting keyboard and the backlight module thereof. Therefore, the heat dissipation can be performed by utilizing the through channel to heat the heating area below the heat dissipation key, and the heat dissipation efficiency of the luminous keyboard is improved. In addition, the invention designs the light-reducing pattern on the periphery of the through channel to shield the light and the diffusion pattern arranged on the adjacent side to guide the light to illuminate the heat-radiating key, thereby improving the consistency of the whole light emission and solving the problem of light leakage possibly existing in the up/down direction of the through channel.

The invention will now be described in more detail with reference to the drawings and specific examples, which are not intended to limit the invention thereto.

Drawings

Fig. 1 is a schematic diagram of a light emitting keyboard according to an embodiment of the invention.

Fig. 2 is a partial cross-sectional view of the light emitting keyboard of fig. 1.

Fig. 3 is a partial schematic view of each element of the luminous keyboard in fig. 1.

Fig. 4 is a partial schematic view of the light emitting keyboard of fig. 1.

Fig. 5 is a partial schematic view of the light emitting keyboard of fig. 1.

Fig. 6 is a partial schematic view of the light emitting keyboard of fig. 1.

Detailed Description

Referring to fig. 1, fig. 1 is a schematic diagram of a light emitting keyboard LKB according to an embodiment of the invention.

As shown in fig. 1, a heating element HE (for example, an integrated circuit or an electronic component), a fan F, and a heat pipe HP are present below the light emitting keyboard LKB, and a heat dissipation arrangement is required at a heating region HR where the heating element HE, the fan F, and the heat pipe HP overlap the light emitting keyboard LKB. The light emitting keyboard LKB includes a backlight module BLM and a plurality of heat dissipating keys KS. The backlight module BLM is provided with a bottom plate SUP, and a plurality of heat dissipation keys KS are disposed on the bottom plate SUP. Generally, the plurality of heat dissipation keys KS may include a square key and a multiple key (e.g., space key). It should be noted that the number, size and arrangement of the heat dissipating keys KS may be determined according to practical applications, and are not limited to the embodiment shown in the drawings. The backlight module BLM includes a light plate LCB, a light guide plate LGP, and a light shielding plate SS. The light panel LCB, the light guide plate LGP and the light shielding plate SS are stacked up and down, i.e., the light guide plate LGP is disposed on the light panel LCB, and the light shielding plate SS is disposed on the light guide plate LGP.

Referring to fig. 2 to 3, fig. 2 is a cross-sectional view of a partial area T1 of the light emitting keyboard LKB in fig. 1, and fig. 3 is a partial schematic view of each element in the single heat dissipating key KS of the light emitting keyboard LKB in fig. 1, wherein fig. 3 omits the supporting device SSR, the triggering element TE and the resetting element RE.

In this embodiment, at least one light emitting unit LED (e.g., light emitting diode) on the light panel LCB of the backlight module BLM is located below each heat dissipating key KS on the light emitting keyboard LKB. In other possible embodiments, the light bar (light bar) on the light panel LCB of the backlight module BLM may be corresponding to the plurality of heat dissipation keys KS on the light-emitting keyboard LKB. The backlight module BLM may have a plurality of through channels PC for respectively and symmetrically corresponding to the plurality of heat dissipation keys KS. The through-channel PC penetrates the lamp panel LCB, the light guide plate LGP, and the light shielding plate SS. As shown in fig. 2, two through channels PC are corresponding to the lower side of the single heat dissipation key KS, but not limited thereto. The through-channel PC is formed by stacking the layers of the key circuit board MEM, the bottom plate SUP, the light shielding plate SS, the light guide plate LGP, the reflective layer REF and the light plate LCB along the Z direction, wherein the holes at least partially overlap, and the hole of the light guide plate LGP may be larger than the holes of the reflective layer REF and the light shielding plate SS. Thereby, the through passage PC can serve as a heat radiation passage of the heat generation region HR.

The heat radiation key KS includes a key cap KCC, a support device SSR, a key circuit board MEM, and a base plate SUP. The key cap KCC is arranged opposite to the base plate SUP. The key cap KCC has an inner light-transmitting region KC0 for the light of the light emitting unit LED to project to illuminate the character on the key cap KCC. The key cap KCC further has a plurality of outer light shielding regions KC1 adjacent to the inner light transmitting region KC 0. As shown in fig. 2, the position of the outer light shielding region KC1 may correspond to the position of the through-channel PC, so that the through-channel PC is located below the opaque region, thereby improving the situation of light leakage. The support device SSR is disposed between the key cap KCC and the base plate SUP. When the key cap KCC is pressed, the key cap KCC is vertically moved along with the support device SSR toward the bottom plate SUP. In addition, a reset element RE is provided between the key cap KCC and the base plate SUP, and the reset element RE is, for example, a rubber washer (rubber dome), but not limited thereto. The main bodies of the elements of the key cap KCC, the support means SSR, the reset element RE, the key circuit board MEM and the back plate SUP may be made of a non/low reflective material or a light absorbing material, thereby reducing the light reflection down.

The key circuit board MEM is disposed above the backlight module BLM, and the key circuit board MEM has a switch pad SP corresponding to the trigger TE of the heat dissipating key KS, and the switch pad SP is, for example, but not limited to, a membrane switch (membrane switch). In the present embodiment, the key circuit board MEM includes a circuit portion EC, a plurality of circuit board holes MEMH, and a switch pad SP. Circuit board hole MEMH forms part of through via PC. The switch pad SP is connected to the circuit portion EC and is located between these circuit board holes MEMH. In addition, the key circuit board MEM may be coated with a light absorbing material around the through channel PC, for example, to improve the light leakage upward.

Each heat dissipation key KS includes a portion of a chassis SUP, and the chassis SUP is disposed between the key circuit board MEM and the backlight module BLM. In the present embodiment, the bottom plate SUP may include an annular rib Sr0, a plurality of bridging ribs Sr1 and a supporting frame Sf, wherein the bridging ribs Sr1 connect the annular rib Sr0 and the supporting frame Sf, and a plurality of bottom plate holes SUPH are formed between the bridging ribs Sr1, the annular rib Sr0 and the supporting frame Sf. The bottom plate holes SUPH on both sides constitute a part of the through-passage PC. The switch pad SP of the key circuit board MEM is disposed corresponding to the bottom plate hole SUPH in the center of the bottom plate SUP (e.g., corresponding to the bottom plate hole SUPH surrounded by the annular rib Sr 0) so that the switch pad SP may partially enter the bottom plate hole SUPH in the center of the bottom plate SUP without interference with the light shielding plate SS and the light emitting unit LED thereunder.

The light shielding plate SS is disposed below the bottom plate SUP. In the present embodiment, the light shielding plate SS has a plurality of light shielding plate through holes SSH, a plurality of light reduction patterns LRP, and a light shielding frame SSF. The light shielding plate through holes SSH are respectively located in the light-reducing patterns LRP, and the light shielding frame SSF corresponds to the supporting frame Sf of the bottom plate SUP. The shutter through hole SSH constitutes a part of the through passage PC. The periphery of the through channel PC is respectively provided with a dimming pattern LRP of the light shielding plate SS to shield light, wherein the dimming pattern LRP can be an annular black paint coated on the upper surface or the lower surface of the light shielding plate SS.

The light guide plate LGP is disposed below the light shielding plate SS. In the present embodiment, the light guide plate LGP has a light guide hole L0, a plurality of light guide plate through holes LGPH, and a plurality of diffusion patterns DP. The light emitting unit LED may be located in the light guide hole L0. The top surface and/or the bottom surface of the light guide plate LGP near the light guide hole L0 may have an adhesive surrounding the light guide hole L0 to adhere the light shielding plate SS and/or the light panel LCB, respectively. The light guide plate through hole LGPH corresponds to the position of the light shielding plate through hole SSH, and constitutes a part of the through passage PC. The diffusion pattern DP of the light guide plate LGP may be formed of a microstructure area and corresponds to the position of the bottom plate hole SUPH of the bottom plate SUP so as to guide the light transmitted in the light guide plate LGP to be emitted upward. In a top view along the Z direction, a diffusion pattern DP of the light guide plate LGP may be disposed adjacent to the dimming pattern LRP of the light shielding plate SS to guide the light of the light emitting unit LED to illuminate the corresponding heat dissipating key KS. In addition, the light-reducing pattern LRP may be an annular black paint coated on the upper surface or the lower surface of the light guide plate LGP at the periphery of the through-channel PC, or may be a light-absorbing material coated on the wall of the through-hole LGPH of the light guide plate, or may be an adhesive provided on the upper and lower surfaces of the through-channel PC adjacent to the periphery of the through-channel PC in the through-hole LGPH of the light guide plate, so as to improve the light leakage of the light guide plate LGP in the up or down direction of the through-channel PC.

The lamp panel LCB is disposed under the light guide plate LGP and may include a reflective layer REF. In the present embodiment, the lamp panel LCB has a light emitting unit LED, a plurality of lamp panel through holes LCBH, a plurality of dimming patterns LRP and diffusion patterns DP, and a plurality of main wires HT and sub-wires ST. The light emitting unit LED is connected between the two sub-wires ST, and the light emitting unit LED is connected between the two main wires HT via the two sub-wires ST. In the present embodiment, the main wires HT and the sub-wires ST form a light emitting circuit (lighting circuit) of the light emitting unit LED, the two main wires HT are main driving lines of the light emitting unit LED, and the two sub-wires ST are sub-driving lines of the light emitting unit LED. The light emitting unit LED may be a white light emitting diode or a combination of red, green and blue light emitting diodes, depending on the actual application. In general, the main conductive line HT is a conductive line with a larger cross-sectional area, and can span across a plurality of heat dissipating keys KS. The lamp plate via LCBH corresponds to the positions of the light guide plate via LGPH and the light shielding plate via SSH, and also forms a part of the through-channel PC. The dimming pattern LRP may be an annular black paint formed on the reflective layer REF to be disposed at the periphery of the through-channel PC. The diffusion pattern DP may also be formed by a microstructure area and may be formed on the reflective layer REF, and the diffusion pattern DP is disposed around the dimming pattern LRP to guide the light of the light emitting unit LED to illuminate the corresponding heat dissipating key KS. That is, the diffusion pattern DP may be formed on the light guide plate LGP and/or the light panel LCB.

Referring to fig. 4, fig. 4 is a schematic diagram of a partial area T1 of the light emitting keyboard LKB in fig. 1, wherein the key cap KCC, the supporting device SSR, the triggering element TE and the resetting element RE are omitted.

The two heat dissipation keys KS in the partial region T1 each have a key cap projection area KCCP of the key cap KCC, and the circuit portions EC of the key circuit board MEM extend across the range of the key cap projection areas KCCP. As is clear from fig. 3 to 4, the rib portion (including the annular rib Sr0 and the bridging rib Sr 1) of the bottom plate SUP extends across the range of each key cap projection area KCCP. The through-channels PC correspond to the single heat sink key KS and include left through-channels PC-L and right through-channels PC-R. The two left through channels PC-L respectively correspond to the two heat dissipation keys KS and penetrate through the lamp panel LCB, the light guide plate LGP and the light shielding plate SS; the two right through channels PC-R are also respectively corresponding to the two heat dissipation keys KS in a symmetrical manner with the corresponding left through channels PC-L and penetrate through the light panel LCB, the light guide plate LGP and the light shielding plate SS. The peripheries of the two left through channels PC-L are respectively provided with left dimming patterns LRP-L, and the upper and lower adjacent sides of each left dimming pattern LRP-L are provided with two left diffusion patterns DP-L; and the peripheries of the two right through channels PC-R are respectively provided with a right dimming pattern LRP-R, and the upper and lower adjacent sides of each right dimming pattern LRP-R are provided with two right diffusion patterns DP-R. That is, the dimming pattern LRP corresponds to the single heat dissipating key KS and may include a left dimming pattern LRP-L and a right dimming pattern LRP-R, and the diffusion pattern DP corresponds to the single heat dissipating key KS and may include a left diffusion pattern DP-L and a right diffusion pattern DP-R. That is, two diffusion patterns DP are provided adjacent to each light reduction pattern LRP, and each light reduction pattern LRP is located between the two diffusion patterns DP adjacent to each light reduction pattern LRP in a plan view along the Z direction.

The left dimming pattern LRP-L and the left diffusion pattern DP-L may form a left athermalized optical pattern group OPG-L, and the right dimming pattern LRP-R and the right diffusion pattern DP-R may form a right athermalized optical pattern group OPG-R. In this embodiment, the backlight module BLM has two through channels PC (i.e., a left through channel PC-L and a right through channel PC-R) corresponding to each heat dissipating key KS, and the left and right heat lowering optical pattern groups OPG-L and OPG-R corresponding to each heat dissipating key KS are symmetrically located at opposite sides of each key cap projection area KCCP. In this embodiment, the two left heat-reducing optical pattern sets corresponding to the two heat dissipation keys KS have the same pattern, and the two right heat-reducing optical pattern sets OPG-R corresponding to the two heat dissipation keys KS also have the same pattern. In practical operation, since the circuit portion EC of the key circuit board MEM of the square key may not transmit light and may not pass over the diffusion pattern DP, the portion of the circuit portion EC extending longitudinally is preferably located between the left and right heat-reducing optical pattern groups OPG-L and OPG-R corresponding to the single heat-dissipating key KS. In practical operation, since the rib portion (including the annular rib Sr0 and the bridging rib Sr 1) of the bottom plate SUP of the square key may not transmit light, and may not pass over the diffusion pattern DP, the annular rib Sr0 and the bridging rib Sr1 of the bottom plate SUP are preferably located between the left and right heat-reducing optical pattern sets OPG-L and OPG-R corresponding to the single heat-dissipating key KS. That is, in a plan view along the Z direction, the left dimming pattern LRP-L and the left diffusion pattern DP-L are located on the same side of the circuit portion EC and on the same side of the rib (including the annular rib Sr0 and the bridging rib Sr 1) of the bottom plate SUP, and the right dimming pattern LRP-R and the right diffusion pattern DP-R are located on the same side of the circuit portion EC and on the same side of the rib (including the annular rib Sr0 and the bridging rib Sr 1) of the bottom plate SUP. In a plan view along the Z direction, the left dimming pattern LRP-L and the right dimming pattern LRP-R are located on opposite sides of the circuit portion EC and on opposite sides of the rib (including the annular rib Sr0 and the bridging rib Sr 1) of the bottom plate SUP, and the left diffusion pattern DP-L and the right diffusion pattern DP-R are located on opposite sides of the circuit portion EC and on opposite sides of the rib (including the annular rib Sr0 and the bridging rib Sr 1) of the bottom plate SUP.

Referring to fig. 5, fig. 5 is a schematic diagram of a partial area T2 of the light emitting keyboard LKB in fig. 1, wherein the key cap KCC, the supporting device SSR, the triggering element TE and the resetting element RE are omitted. The four heat dissipating keys KS covered in the local area T2 may also employ the technical features described above, and will not be described herein. The description of fig. 5 focuses mainly on the technical features between the heat dissipating keys KS of different rows (row) in the light emitting keyboard LKB.

As shown in fig. 5, the heat radiation key KS on the left side of the upstream ROW1 is adjacent to the heat radiation key KS on the left side of the middle ROW2 in the Y direction but is offset in the X direction, and the heat radiation key KS on the right side of the upstream ROW1 is adjacent to the heat radiation key KS on the right side of the middle ROW2 in the Y direction but is offset in the X direction. The right heat-reducing optical pattern group OPG-R (formed by the right dimming pattern LRP-R and the right diffusion pattern DP-R) corresponding to the heat dissipating key KS located on the left side of the upstream ROW1 at least partially overlaps the left heat-reducing optical pattern group OPG-L (formed by the left dimming pattern LRP-L and the left diffusion pattern DP-L) corresponding to the heat dissipating key KS located on the left side of the middle ROW2 in the Y direction, i.e. the two heat-reducing optical pattern groups partially overlap each other to form a connection line C1. In addition, the right heat-reducing optical pattern group OPG-R (formed by the right dimming pattern LRP-L and the right diffusion pattern DP-L) corresponding to the heat-dissipating key KS located on the right side of the upstream ROW1 at least partially overlaps the left heat-reducing optical pattern group OPG-L (formed by the left dimming pattern LRP-L and the left diffusion pattern DP-L) corresponding to the heat-dissipating key KS located on the right side of the middle ROW2 in the Y direction, i.e. the two heat-reducing optical pattern groups partially overlapped with each other also form a connection line C1.

Furthermore, the left heat-reducing optical pattern group OPG-L (formed by the left dimming pattern LRP-L and the left diffusion pattern DP-L) corresponding to the heat-dissipating key KS located on the right side of the upstream ROW1 at least partially overlaps the right heat-reducing optical pattern group OPG-R (formed by the right dimming pattern LRP-R and the right diffusion pattern DP-R) corresponding to the heat-dissipating key KS located on the left side of the middle ROW2 in the Y direction, i.e. the two heat-reducing optical pattern groups partially overlap each other to form a connection line C2. As described above, the connection line C1 is formed by the right heat-reducing optical pattern group OPG-R located in the upper row and the left heat-reducing optical pattern group OPG-L located in the lower row corresponding to the two heat-dissipating keys KS adjacent in the Y direction but offset in the X direction, and the connection line C2 is formed by the left heat-reducing optical pattern group OPG-L located in the upper row and the right heat-reducing optical pattern group OPG-R located in the lower row corresponding to the two heat-dissipating keys KS adjacent in the Y direction but offset in the X direction. Fig. 5 shows a special layout of the centers of the 1/2 key offset with respect to the heat dissipating keys KS of two adjacent rows of the light emitting keyboard LKB.

Referring to fig. 6, fig. 6 is a schematic diagram of a partial area T3 of the light emitting keyboard LKB in fig. 1, wherein the key cap KCC, the supporting device SSR, the triggering element TE and the resetting element RE are omitted. The four heat dissipating keys KS covered in the local area T3 may also employ the technical features described above, and will not be described herein. The description of fig. 6 focuses mainly on the technical features between heat dissipating keys KS of different rows (row) in the light emitting keyboard LKB.

As shown in fig. 6, the heat radiation key KS located on the left side of the middle ROW2 is adjacent to the heat radiation key KS located on the left side of the lower ROW3 in the Y direction but is offset in the X direction, and the heat radiation key KS located on the right side of the middle ROW2 is adjacent to the heat radiation key KS located on the right side of the lower ROW3 in the Y direction but is offset in the X direction. The right heat-reducing optical pattern group OPG-R (formed by the right dimming pattern LRP-R and the right diffusion pattern DP-R) corresponding to the heat-dissipating key KS located at the left side of the middle ROW2 at least partially overlaps the switch pad SP corresponding to the heat-dissipating key KS located at the left side of the lower ROW3 in the Y direction, i.e. the right heat-reducing optical pattern group OPG-R and the switch pad SP that are partially overlapped with each other form a connection D1. In addition, the right heat-reducing optical pattern group OPG-R (formed by the right dimming pattern LRP-R and the right diffusion pattern DP-R) corresponding to the heat-dissipating key KS located on the right side of the middle ROW2 at least partially overlaps the switch pad SP corresponding to the heat-dissipating key KS located on the right side of the lower ROW3 in the Y direction, i.e. the right heat-reducing optical pattern group OPG-R and the switch pad SP partially overlapped with each other also form a connection line D1.

Furthermore, the left heat-reducing optical pattern group OPG-L (formed by the left dimming pattern LRP-L and the left diffusion pattern DP-L) corresponding to the heat-dissipating key KS located on the right side of the middle ROW2 at least partially overlaps the key gap area G located outside the heat-dissipating key KS located on the left/right side of the lower ROW3 in the Y direction, i.e. the left heat-reducing optical pattern group OPG-L and the key gap area G that are partially overlapped form a connection line D2. As described above, the connection line D1 is formed by the right heat-reducing optical pattern group OPG-R located in the upper row corresponding to the two heat-dissipating keys KS adjacent to each other in the Y direction but offset in the X direction and the corresponding switch pad SP located in the lower row, and the connection line D2 is formed by the left heat-reducing optical pattern group OPG-L located in the upper row corresponding to the two heat-dissipating keys KS adjacent to each other in the Y direction but offset in the X direction and the corresponding key gap region G located in the lower row. Fig. 6 shows another special layout of the heat dissipation keys KS of two adjacent rows of the corresponding light emitting keyboard LKB with 1/4 key centers offset.

In summary, the present invention designs one or more through channels in a light-emitting keyboard and a backlight module for the same. Therefore, the heat dissipation can be performed by utilizing the through channel to heat the heating area below the heat dissipation key, and the heat dissipation efficiency of the luminous keyboard is improved. In addition, the invention designs the light-reducing pattern on the periphery of the through channel to shield the light and the diffusion pattern arranged on the adjacent side to guide the light to illuminate the heat-radiating key, thereby improving the consistency of the whole light emission and solving the problem of light leakage possibly existing in the up/down direction of the through channel.

Of course, the present invention is capable of other various embodiments and its several details are capable of modification and variation in light of the present invention by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The utility model provides a backlight unit for luminous keyboard, this luminous keyboard contains two at least heat dissipation buttons, its characterized in that, this backlight unit includes:

A lamp panel;

A light guide plate; and

2. The backlight module according to claim 1, wherein each of the at least two dimming patterns is provided with two diffusion patterns on adjacent sides thereof, and each of the at least two dimming patterns is located between the two diffusion patterns on the adjacent sides thereof.

3. The backlight module according to claim 1, wherein the backlight module has two through channels corresponding to each of the at least two heat dissipation buttons, each of the at least two heat dissipation buttons has a keycap projection area, and the heat-reducing optical pattern groups corresponding to each of the at least two heat dissipation buttons are symmetrically located at opposite sides of each keycap projection area.

4. The backlight module according to claim 1, wherein the at least two dimming patterns are formed on the light shielding plate or the light guiding plate.

5. The backlight module according to claim 1, wherein the diffusion pattern is formed on the light guide plate or the lamp panel.

6. A lighted keypad, comprising:

7. The lighted keyboard of claim 6, further comprising:

8. The luminous keyboard of claim 6, wherein the backlight module has two through channels corresponding to the heat dissipation keys, two dimming patterns corresponding to the two through channels are located at opposite sides of the circuit portion, and two diffusion patterns corresponding to the two through channels are located at opposite sides of the circuit portion.

9. The lighted keyboard of claim 8, further comprising:

10. The luminous keyboard of claim 6, wherein the dimming pattern is formed on the light shielding plate or the light guiding plate.

11. The luminous keyboard of claim 6, wherein the at least one diffusion pattern is formed on the light guide plate or the lamp panel.

12. The utility model provides a backlight unit for luminous keyboard, this luminous keyboard has first heat dissipation button and second heat dissipation button, and this second heat dissipation button is adjacent but misplaced in the second direction with this first heat dissipation button, its characterized in that, this backlight unit includes:

A lamp panel;

A light guide plate; and

13. The backlight module according to claim 12, wherein each of the left and right athermalized optical pattern sets comprises a dimming pattern and at least one diffusion pattern disposed adjacent to the dimming pattern.

14. A backlight module according to claim 13, wherein each light-reducing pattern is formed on the light-shielding plate or the light-guiding plate.

15. A backlight module according to claim 13, wherein each diffusion pattern is formed on the light guide plate or the lamp panel.

16. A lighted keypad, comprising:

17. The luminous keyboard of claim 16, wherein the two through channels are respectively provided with left heat-reducing optical pattern groups at the periphery, each left heat-reducing optical pattern group corresponds to each of the first heat dissipation key and the second heat dissipation key, and the left heat-reducing optical pattern groups corresponding to the first heat dissipation key at least partially overlap a key gap area outside the second heat dissipation key in the first direction.

18. The illuminated keyboard of claim 16, wherein each of the right athermalized optical pattern sets comprises a dimming pattern and at least one diffusion pattern disposed adjacent to the dimming pattern.

19. The illuminated keyboard of claim 18, wherein each dimming pattern is formed on the light shield or the light guide plate.

20. The illuminated keyboard of claim 18, wherein each diffusion pattern is formed on the light guide plate or the light panel.